The Developer Connection - Device Driver Kit for OS/2 3

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Text File | 1994-01-19 | 91.4 KB | 3,329 lines

* * Title: vio.doc * * Function: * Workplace OS/2 base video APIs * * Copyright: * Copyright (C) IBM Corp. 1993 * * Notes: * This is preliminary documentation and subject to change. * VioAssociate ================================================================================ Associate or Disassociate a Vio presentation space with a device context. CALL SYNTAX ----------- #define INCL_VIO APIRET VioAssoicate(HDC hdc, HVIO hvio); PARAMETERS ---------- hdc (HDC) - input Device context handle. If this is NULL, a disassociation occurs. hvio (HVIO) - input Vio presentation space handle. This is returned from VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 436 ERROR_VIO_INVALID_HANDLE 495 ERROR_VIO_NOT_PRES_MGR_SG 499 ERROR_VIO_ASSOCIATED_DC REMARKS ------- Subsequent Vio calls to this Vio presentation space will direct output to the specified device context. If a null handle is specified for the device context, the presentation space is disassociated from any device context. An associated presentation space or device context cannot be associated. The screen device context is the only kind of device that can be associated with a Vio presentation space. VioCreateLogFont ================================================================================ Specify a font for use by a Vio session CALL SYNTAX ----------- #define INCL_VIO APIRET VioCreateLogFont(PFATTR attrs, ULONG lcid, PSTR8 Name, HVIO, hvio); PARAMETERS ---------- attrs (PFATTR) - input Pointer to structure containing the attributes of the font. lcid (LONG) - input Local identifier. This must be a value in the range 1 to 3. It is an error if lcid is already in use. Name (STR8) - input Logical font name. This string is optional, and is used to describe the logical font. hvio (HVIO) - input Vio presentation space handle. This is either zero to indicate the default Vio session, or a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- The system selects the font most closely matching the specified font from the set of monospaced fonts which are installed on the system. In OS/2 2.x, hvio cannot be zero. VioCreatePS ================================================================================ Create a Vio presentation space CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioCreatePS(PHVIO phvio, ULONG Rows, ULONG Columns, ULONG Format, ULONG Bytes, HVIO hvio); PARAMETERS ---------- phvio (PHVIO) - output The location to return the newly created presentation space handle. Rows (ULONG) - input The number of rows in the presentation space. The maximum value allowed is 255. Columns (ULONG) - input The number of columns in the presentation space. The maximum value allowed is 255. Format (ULONG) - input The format of the attributes: 1 = VGA compatible 3 = MFI compatible AttrBytes (ULONG) - input The number of attribute bytes. This is used along with the format to select the attribute structure. This field has a value of 1 or 3. hvio (HVIO) - input The value is reserved, and must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- VioDeleteSetId ================================================================================ Make the logical font no longer avaliable via the local id CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioDeleteSetId(ULONG lcid, HVIO hvio); PARAMETERS ---------- lcid (ULONG) - input The local identifier for a font hvio (HVIO) - input Vio presentation space handle. This is either zero to indicate the default Vio session, or a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- After this call, the lcid is available for reuse. In OS/2 2.x, hvio cannot be zero. VioDestroyPS ================================================================================ Destroy the Vio presentation space CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioDestroyPS(HVIO hvio); PARAMETERS ---------- hvio (HVIO) - input Vio presentation space handle. This is a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 436 ERROR_VIO_INVALID_HANDLE 499 ERROR_VIO_ASSOCIATED_DC REMARKS ------- The presentation space must not be associated with a device context when VioDestroyPS is called. The Vio presentation space handle is invalid after this call After this call, the lcid is available for reuse. VioEndPopUp ================================================================================ This call is issued by the application when it no longer requires the temporary screen obtained through a previous VioPopUp call. CALL SYNTAX ----------- #define INCL_VIO APIRET VioEndPopUp(HVIO hvio); PARAMETERS ---------- hvio (HVIO) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 405 ERROR_VIO_NO_POPUP 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- When the application issues a VioEndPopUp call, all video calls are directed to the application's normal video buffer. An error is returned if issued with a non-zero handle. VioGetAnsi =============================================================================== This call returns the current ANSI status On/Off state. CALL SYNTAX ----------- #define INCL_VIO APIRET VioGetAnsi(PULONG Indicator, HVIO hvio); PARAMETERS ---------- Indicator (PULONG) - output Address of the current ANSI status. A value of 1 indicates ANSI is active, and a value of 0 indicates ANSI is not active. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED VioGetBuf ================================================================================ This call returns the address of the logical video buffer (LVB). CALL SYNTAX ----------- #define INCL_VIO APIRET VioGetBuf(PULONG LVBPtr, PULONG Length, HVIO hvio); PARAMETERS ---------- LVBPtr (PULONG) - output Address of the logical video buffer. Length (PULONG) - output Address of the length buffer in bytes. The length is: number of rows * number of columns * size of cell. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 430 ERROR_VIO_ILLEGAL_DURING_POPUP 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- An application using VioGetBuf can prepare a screen in the application's own logical video buffer (LVB) offline. When the application is in the foreground, the physical screen buffer is updated from the LVB when VioShowBuf is issued. When the application runs in the background, the physical screen buffer is updated when the application is switched to the foreground. Once VioGetBuf is issued, all VioWrtXX calls issued while the application is running in the foreground are written to the physical display buffer and LVB. VioGetMode may be used to determine the dimensions of the buffer. If VioSetMode is issued following a VioGetBuf call, the size of the logical video buffer is changed, and VioGetBuf should be reissued. VioGetConfig ================================================================================ This call returns the video display configuration. CALL SYNTAX ----------- typedef struct _VIOCONFIGINFO { /* vioin */ ULONG cb; /* Length of this data structure */ ULONG adapter; /* Display adapter type */ ULONG display; /* Display/monitor type */ ULONG cbMemory; /* Bytes of memory on the adapter */ ULONG Configuration; /* Configuration number */ ULONG VDHVersion; /* Reserved */ ULONG Flags; ULONG HWBufferSize; /* Size to save video state */ ULONG FullSaveSize; /* Full save size */ ULONG PartSaveSize; /* Partial save size */ ULONG EMAdaptersOFF; /* Offset to emulated adapter types */ ULONG EMDisplaysOFF; /* Offset to emulated display types */ } VIOCONFIGINFO; #define INCL_VIO APIRET VioGetConfig(PULONG ConfigID, PVIOCONFIGINFO ConfigData, HVIO hvio); PARAMETERS ---------- ConfigID (ULONG) - input Identifies for which display configuration information is being requested: Value Definition 0 Current configuration 1 Primary configuration 2 Secondary configuration. ConfigData (PVIOCONFIGINFO) - output Address of structure where the display configuration is returned. length (ULONG) Input parameter to VioGetConfig. The length must be either 4 to indicate the actual length should be returned, or at least 48. adaptertype (ULONG) Display adapter type. Value Definition 0-3 Reserved 3 VGA Display Adapter 4-6 Reserved 7 8514/A. 8 Image Adapter/A 9 XGA Display Adapter Values ranging from 0-4095 are reserved for IBM. displaytype (USHORT) Display or monitor type. Value Definition 0-2 Reserved 3 13" Monochrome Display 4 13" Color Displays 5-8 Reserved 9 16" 1024x768 capable color display 10 LCD or Plasma display 11 large monochrome display 12 14" 1024x768 capable color display 13 Reserved Values ranging from 0-4095 are reserved for IBM. adaptmem (ULONG) Amount of memory, in bytes, on the adapter. Configuration (ULONG) Number of the display configuration that this data corresponds to. This is assigned by the video subsystem. VDHVersion (ULONG) This field is reserved. Flag bits (ULONG) Are defined as follows: Bit Description 31-1 Reserved 0 Power up display configuration. Hardware state buffer size (ULONG) Size of the buffer required by the Base Video Handler (BVH) to save the full hardware state excluding the physical display buffer. Max buffer size - full save (ULONG) Maximum size buffer required by the BVH to save the full physical display buffer. Max buffer size - partial save (ULONG) Maximum size buffer required by the BVH to save the portion of the physical display buffer that is overlaid by a pop-up. Offset to emulated adapter types (ULONG) Offset within the configuration data structure to the following information describing what other display adapters are emulated by this display adapter. Number of Data words (ULONG) Contains a one word field specifying a count of data words to follow. Data word 1 (ULONG) Bits set in the data words identify display adapters emulated. Data word 1 has the following definition: Bit Description 0-2 Reserved 3 VGA 4-6 Reserved 7 8514/A Adapter 8 Image Adapter/A 9 XGA Adapter 10-31 Reserved. Offset to emulated display types (ULONG) Offset within the configuration data structure to the following information describing what other displays are emulated by this display. Number of Data words (ULONG) One word field specifying a count of data words to follow. Data word 1 (ULONG) Bits set in the data words identify displays emulated. Data word 1 has the following definition: Bit Description 0-2 Reserved 3 13" Monochrome Display 4 13" Color Displays 5-8 Reserved 9 16" 1024x768 capable color display 10 LCD or Plasma display 11 large monochrome display 12 14" 1024x768 capable color display 13-31 Reserved hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 436 ERROR_VIO_INVALID_HANDLE 438 ERROR_VIO_INVALID_LENGTH 465 ERROR_VIO_DETACHED REMARKS ------- The values returned may not be correct if the adapter cannot be properly identified, or if the device is not capable of returning its settings. VioGetCp ================================================================================ This call allows a process to query the code page currently used to display text data. CALL SYNTAX ----------- #define INCL_VIO APIRET VioGetCp(ULONG Reserved, PUSHORT CodePageID, HVIO hvio); PARAMETERS ---------- Reserved (ULONG) - input Reserved value, must be zero. CodePageID (PUSHORT) - output Address of a word in the application's data area. The current video code page is returned in this word. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- The display code page ID previously set by VioSetCp, or inherited from the requesting process, is returned to the caller. The code page tag returned is the currently active code page. VioGetCurPos ================================================================================ This call returns the coordinates of the cursor. CALL SYNTAX ----------- #define INCL_VIO APIRET VioGetCurPos(PULONG Row, PULONG Column, HVIO hvio); PARAMETERS ---------- Row (PULONG) - output Address of the current Row position of the cursor where 0 is the top row. Column (PULONG) - output Address of the current column position of the cursor where 0 is the leftmost column. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED VioGetCurType ================================================================================ This call returns the cursor type. CALL SYNTAX ----------- typedef struct _VIOCURSORINFO { USHORT yStart; /* cursor start line */ USHORT cEnd; /* cursor end line */ USHORT cx; /* cursor width */ USHORT attr; /* -1=hidden cursor */ } VIOCURSORINFO; #define INCL_VIO APIRET VioGetCurType(PVIOCURSORINFO CursorData, HVIO hvio); PARAMETERS ---------- CursorData (PVIOCURSORINFO) - output Address of the cursor characteristics structure: startline (USHORT) Horizontal scan line in the character cell that marks the top line of the cursor. If the character cell has n scan lines, 0 is the top scan line of the character cell and (n-1) is the bottom scan line. endline (USHORT) Horizontal scan line in the character cell that marks the bottom line of the cursor. Scan lines within a character cell are numbered as defined in startline. cursorwidth (USHORT) Width of the cursor. In text modes, cursorwidth is the number of columns. The maximum number supported by the OS/2 base video subsystem is 1. In graphics modes, cursorwidth is the number of pels. cursorattrib (USHORT) A value of -1 denotes a hidden cursor, all other values in text mode denote normal cursor and in graphics mode denote color attribute. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If CursorStartLine and CursorEndLine were originally specified as percentages on VioSetCurType (using negative values), the positive values into which they were translated are returned. Refer to VioSetCurType for more information on how percentages can be used to set CursorStartLine and CursorEndLine independent of the number of scan lines per character cell. VioGetDeviceCellSize ================================================================================ Returns the size of the current character cell in pels CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioGetDeviceCellSize(PULONG Height, PULONG Width, HVIO hvio); PARAMETERS ---------- Height (PULONG) - output Location to return the height of the character cell in pels Width (PULONG) - output Location to return the width of the character cell in pels hvio (HVIO) - input Vio presentation space handle. This is either zero to indicate the default Vio session, or a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- In OS/2 2.x, hvio cannot be zero. VioGetMode ================================================================================ This call returns the mode of the display. CALL SYNTAX ----------- typedef struct _VIOMODEINFO { USHORT cb; /* Length of the entire data structure */ UCHAR fbType; /* Bit mask of mode being set */ UCHAR color; /* Number of colors (power of 2) */ USHORT col; /* Number of text columns */ USHORT row; /* Number of text rows */ USHORT hres; /* Horizontal resolution */ USHORT vres; /* Vertical resolution */ UCHAR fmt_ID; /* Attribute format */ UCHAR attrib; /* Number of attributes */ USHORT resv; /* Reserved */ ULONG buf_addr; /* Video aperture address */ ULONG buf_length; /* Video aperture length */ ULONG full_length; /* Video state full save length */ ULONG partial_length; /* Video state partial save length */ PCH ext_data_addr; /* Extra data address */ } VIOMODEINFO; typedef VIOMODEINFO far *PVIOMODEINFO; #define INCL_VIO APIRET VioGetMode(ModeData, hvio); PVIOMODEINFO ModeData; /* Mode characteristics */ HVIO hvio; /* Vio handle */ APIRET rc; /* return code */ PARAMETERS ---------- ModeData (PVIOMODEINFO) - input/output Far address of a structure where mode characteristics are returned. length (USHORT) Input parameter to VioGetMode. Length specifies the length of the data structure in bytes including Length itself. The value specified on input controls the amount of mode data returned. The minimum structure size required is 2 bytes. The length is modified on output. type (UCHAR) Mode characteristics bit mask: Bit Description 7-4 Reserved 3 0 = VGA BIOS compatible modes 1 = Native mode 2 0 = Enable color burst 1 = Disable color burst 1 0 = Text mode 1 = Graphics mode 0 0 = Monochrome compatible mode 1 = Other numcolors (UCHAR) Number of colors defined as a power of 2. This is equivalent to the number of color bits that define the color, for example: Value Definition 0 Monochrome 1 2 colors 2 4 colors 4 16 colors 8 256 colors 16 64K colors 24 16M colors textcols (USHORT) Number of text columns. textrows (USHORT) Number of text rows. pelcols (USHORT) Horizontal resolution, number of pel columns. pelrows (USHORT) Vertical resolution, number of pel rows. Attribute Format (UCHAR) Format of the attributes. Number of Attributes (UCHAR) Number of attributes in a character cell. Buffer Address (ULONG) Physical address of the physical display aperture. This may be zero for emulated video hardware. Buffer Length (ULONG) Length of the physical display aperture. Full Buffer Size (ULONG) Size of the buffer required for a full save of the video state. Partial Buffer Size (ULONG) Size of the buffer required for a partial (pop-up) save of the video state. Extended Data Area Address (PCH) Virtual address to an extended mode data structure or zero if none. The format of the extended mode data structure is determined by the device driver and is unknown to OS/2. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 436 ERROR_VIO_INVALID_HANDLE 438 ERROR_VIO_INVALID_LENGTH 465 ERROR_VIO_DETACHED REMARKS ------- Refer to VioSetMode for examples. VioGetOrigin ================================================================================ Get the position at which the presentation space maps to the window CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioGetOrg(PULONG Row, PULONG Column, HVIO hvio); PARAMETERS ---------- Height (PULONG) - input Location to return the topmost row shown in the window Width (PULONG) - input Location to return the leftmost column shown in the window hvio (HVIO) - input Vio presentation space handle. This is either zero to indicate the default Vio session, or a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- In OS/2 2.x, hvio cannot be zero. VioGetState ================================================================================ This call returns the current settings of the palette registers, overscan (border) color, blink/background intensity switch, color registers, underline location, or target VioSetMode display configuration. CALL SYNTAX ----------- typedef struct _VIOPALSTATE { USHORT cb; /* Length of this structure in bytes */ USHORT type; /* Request type=0 get palette registers */ USHORT iFirst; /* First palette register to return */ USHORT acolor[1]; /* Color value palette register */ } VIOPALSTATE; typedef VIOPALSTATE far *PVIOPALSTATE; typedef struct _VIOOVERSCAN { USHORT cb; /* Length of this structure */ USHORT type; /* Request type=1 get overscan (border) color */ USHORT color; /* Color value */ } VIOOVERSCAN; typedef VIOOVERSCAN far *PVIOOVERSCAN; typedef struct _VIOINTENSITY { USHORT cb; /* Length of this structure */ USHORT type; /* Request type=2 get blink/background intensity switch */ USHORT fs; /* Value of blink/background switch */ } VIOINTENSITY; typedef VIOINTENSITY far *PVIOINTENSITY; typedef struct _VIOCOLORREG { USHORT cb; USHORT type; USHORT firstcolorreg; USHORT numcolorregs; PCH colorregaddr; } VIOCOLORREG; typedef VIOCOLORREG far *PVIOCOLORREG; typedef struct _VIOSETULINELOC { USHORT cb; USHORT type; USHORT scanline; } VIOSETULINELOC; typedef VIOSETULINELOC far *PVIOSETULINELOC; typedef struct _VIOSETTARGET { USHORT cb; USHORT type; USHORT defaultalgorithm; } VIOSETTARGET; typedef VIOSETTARGET far *PVIOSETTARGET; #define INCL_VIO APIRET VioGetState(PVOID RequestBlock, HVIO hvio); PARAMETERS ---------- RequestBlock (PVOID) - input/output Address of the video state structures consisting of six different structures depending on the request type: Type Definition 0 Get palette registers 1 Get overscan (border) color 2 Get blink/background intensity switch 3 Get color registers 4 Reserved 5 Get the scan line for underlining 6 Get target VioSetMode display configuration. The six structures, depending on request type, are: VIOPALSTATE length (USHORT) - input Length of structure, including length. 38 Maximum valid value. type (USHORT) - input Request type 0 for palette registers. palette (USHORT) - input First palette register in the palette register sequence; must be specified in the range 0 through 15. The palette registers are returned in sequential order. The number returned is based upon length. color (USHORT*(length-6)/2) - output Color value for each palette register. The maximum number of entries in the color value array is 16. VIOOVERSCAN length (USHORT) - input Length of structure, including length. 6 Only valid value. type (USHORT) - input Request type 1 for overscan (border) color. color (USHORT) - input Color value. VIOINTENSITY length (USHORT) - input Length of structure, including length. 6 Only valid value. type (USHORT) - input Request type 2 for blink/background intensity switch. switch (USHORT) - output Switch set as: Value Definition 0 Blinking foreground colors enabled. 1 High intensity background colors enabled. VIOCOLORREG length (USHORT) - input Length of structure, including length. 12 Length in bytes. type (USHORT) - input Request type 3 for color registers. first color (USHORT) - input First color register to get in the color register sequence; must be specified in the range 0 through 255. The color registers are returned in sequential order. number color (USHORT) - input Number of color registers to get; must be specified in the range 1 through 256. datarea (PCH) - input Far address of a data area where the color registers are returned. The size of the data area must be three bytes times the number of color registers to get. The format of each entry returned is as follows: Byte 1 Red value Byte 2 Green value Byte 3 Blue value VIOSETULINELOC length (USHORT) - input Length of structure, including length. 6 Length in bytes. type (USHORT) - input Request type 5 to get the scan line for underlining. scanline (USHORT) - output The value returned is in the range 0 through 31 and is the scan line minus 1. A value of 32 means underlining is disabled. VIOSETTARGET length (USHORT) - input Length of structure, including length. 6 Length in bytes. type (USHORT) - input Request type 6 to get display configuration selected to be the target of the next VioSetMode. select (USHORT) - output Configuration: Value Definition 0 Default selection algorithm. See VioSetMode. 1 Primary 2 Secondary. hvio (HVIO) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 421 ERROR_VIO_INVALID_PARMS 436 ERROR_VIO_INVALID_HANDLE 438 ERROR_VIO_INVALID_LENGTH 465 ERROR_VIO_DETACHED REMARKS ------- Note: VioGetState allows access to hardware dependent features. Not all video hardware will honor these settings, or return valid settings. VioModeUndo ================================================================================ This call allows one thread within a process to cancel a VioModeWait issued by another thread within the same process. CALL SYNTAX ----------- #define INCL_VIO APIRET VioModeUndo(ULONG OwnerIndic, ULONG KillIndic, ULONG Reserved); PARAMETERS ---------- OwnerIndic (ULONG) - input Indicates whether the thread issuing VioModeUndo wants ownership of VioModeWait to be reserved for its process. Value Definition 0 Reserve ownership 1 Give up ownership. KillIndic (ULONG) - input Indicates whether the thread (with the outstanding VioModeWait) should be returned an error code or be terminated. Value Definition 0 Return error code 1 Terminate thread. Reserved (ULONG) - input Reserved value, must be zero RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 422 ERROR_VIO_FUNCTION_OWNED 427 ERROR_VIO_NO_MODE_THREAD 430 ERROR_VIO_ILLEGAL_DURING_POPUP 465 ERROR_VIO_DETACHED 486 ERROR_VIO_BAD_RESERVE REMARKS ------- VioModeUndo may be issued only by a thread within the process that owns VioModeWait. The thread issuing VioModeUndo can either reserve ownership of the VioModeWait function for its process or give up ownership. The thread whose VioModeWait is cancelled is optionally terminated. VioModeWait ================================================================================ This call allows a graphics mode application to be notified when it must restore its video mode, state, and modified display adapter registers. The return from this function call provides the notification. CALL SYNTAX ----------- #define INCL_VIO APIRET VioModeWait(ULONG RequestType, ULONG NotifyType, ULONG Reserved); PARAMETERS ---------- RequestType (ULONG) - input Application request event. RequestType = 0 indicates the application wants to be notified at the end of a pop-up to restore its mode. RequestType = 0 is the only event supported by VioModeWait. NotifyType (PULONG) - output Address of the operation to be performed by the application returning from VioModeWait. NotifyType = 0, indicating restore mode, is the only type of notification returned. Reserved (ULONG) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 422 ERROR_VIO_FUNCTION_OWNED 423 ERROR_VIO_RETURN 424 ERROR_SCS_INVALID_FUNCTION 428 ERROR_VIO_NO_SAVE_RESTORE_THD 430 ERROR_VIO_ILLEGAL_DURING_POPUP 465 ERROR_VIO_DETACHED REMARKS ------- At the completion of an application or hard error pop-up (reference VioPopUp), OS/2 notifies the session that was originally interrupted for the pop-up to restore its mode. The return from this function call provides that notification. The thread that issued the call must perform the restore and then immediately re-issue VioModeWait. When an application's VioModeWait thread is notified, the thread must restore its video mode, state, and modified display adapter registers. An application's VioModeWait thread does not restore the physical display buffer. OS/2 saves/restores the physical display buffer over a pop-up. Only one process for a session can issue VioModeWait. The first process that issues VioModeWait becomes the owner of this function. (Refer to VioModeUndo.) An application must issue VioModeWait only if it writes directly to the registers on the display adapter. Otherwise, the application can allow OS/2 to perform the required restore by not issuing VioModeWait. When an application issues VioModeWait, it is also required to issue VioSavRedrawWait to be notified at screen switch time to perform a full save or restore (reference VioSavRedrawWait. Two application threads must be dedicated to performing these operations. VioPopUp ================================================================================ This call is issued by an application process when it requires a temporary screen to display a momentary message to the user. CALL SYNTAX ----------- #define INCL_VIO APIRET VioPopUp(PUSHORT Options, HVIO hvio); PARAMETERS ---------- Options (PULONG) - input Address of the bit flags that indicate which options to the application are being selected. Bit Description 31-2 Reserved, set to zero. 1 0 = Non-transparent operation. The video mode is set to a textmode. The screen is clreaded, and the cusor is positioned at the upper left corner of the screen. 1 = Transparent operation. If the video mode of the outgoing foreground session is a textmode no mode change occurs. The screen is not cleared, and the cursor remains at its current position. If the video mode is not text, or if this session has a VioSaveRedrawWait active, the pop-up is refused. OS/2 is responsible for saving and restoring the physical display buffer of the previous foreground session around a pop-up. This is true whether transparent or non-transparent operation is selected. 0 0 = Return with unique error code ERROR_VIO_EXISTING_POPUP if pop-up is not immediately available. 1 = Wait if pop-up is not immediately available. hvio (HVIO) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 405 ERROR_VIO_NO_POPUP 406 ERROR_VIO_EXISTING_POPUP 483 ERROR_VIO_TRANSPARENT_POPUP REMARKS ------- VioPopUp is normally issued by the application when it is running in the background and wishes to immediately display a message to the user without waiting to become the active foreground session. When an application process issues VioPopUp, it should wait for the return from the request. If the process allows any of its threads to write to the screen before VioPopUp returns a successful return code, the screen output may be directed to the application's normal video buffer rather than to the pop-up screen. If the process allows any of its threads to issue keyboard or mouse calls before VioPopUp returns a successful return code, the input is directed from the application's normal session. Once the process that issued VioPopUp receives a successful return code, video and keyboard calls issued by any of the threads in the pop-up process are directed to the pop-up screen. This continues until the process issues VioEndPopUp. At that time video and keyboard calls resume being directed to the application's normal video buffer. There may be only one pop-up in existence at any time. If a process requests a pop-up and a pop-up already exists, the process has the choice of waiting for the prior pop-up to complete or receiving an immediate return with an error code. The error code indicates that the operation failed due to an existing pop-up having captured the screen. Video pop-ups provide a mechanism for a background application to notify the operator of an abnormal event the operator must take some action. When considering the suitability of using pop-ups in a particular situation, the possible disruptive effect of pop-ups to the operator should be considered. If the operator were interrupted frequently by pop-ups issued by background applications, the operator would not effectively work with the foreground application. While a video pop-up is in the foreground, the operator cannot use the hot key to switch to another application or to the shell . Before the operator can switch another application or the shell to the foreground, the pop-up application must issue VioEndPopUp. While a video pop-up is in effect, all video calls from the previous foreground session are blocked until the process that issued VioPopUp issues VioEndPopUp. When VioPopUp is issued, only the process within the session that issued VioPopUp is brought to the foreground. Assuming the session was already the foreground session, any video calls issued by other processes in that session are blocked until the process that issued VioPopUp issues VioEndPopUp. DosExecPgm may not be issued by a process during a pop-up. The following video calls are the only calls that may be issued during the pop-up by the process that issued VioPopUp: VioEndPopUp VioScrollLeft VioGetConfig VioSetCurPos VioGetCp VioSetCurType VioGetAnsi VioSetCp VioGetState VioSetState VioGetCurPos VioWrtNChar VioGetCurType VioWrtNAttr VioGetMode VioWrtNCell VioReadCharStr VioWrtCharStr VioReadCellStr VioWrtCharStrAttr VioScrollRight VioWrtCellStr VioScrollUp VioWrtTTY VioScrollDown This function can be used from within a PM application. Kbdxxx, Mouxxx, and Vioxxx calls with a zero handle are all allowed between VioPopUp and VioEndPopUp, and are directed to the pop-up screen. VioQueryFonts ================================================================================ Get the position at which the presentation space maps to the window CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioQueryFonts(PULONG Remfonts, PFONTMETRICS Metrics, ULONG Metlen, PULONG Fonts, PSZ Facename, ULONG Options, HVIO hvio); PARAMETERS ---------- Remfonts (ULONG) - output Number of fonts for which information is not returned. Metrics (PFONTMETRICS) - output Font metrics. Matching font metrics are returned in this buffer. Metlen (ULONG) - input The maximum length of data to be returned for each record. Fonts (PULONG) - input/output Location of the number of fonts to be returned on input. This is updated with the actual number of fonts returned on output. Facename (PSZ) - input The facename of fonts desired, or NULL to indicate that all applicable fonts should be returned. Options (BIT32) - input This controls which fonts are selected: VQF_PUBLIC - Return only public fonts VQF_PRIVATE - Return only private fonts VQF_ALL - Return both public and private fonts hvio (HVIO) - input Vio presentation space handle. This is either zero to indicate the default Vio session, or a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- By inspecting the returned font metrics, the application may choose the font which best meets its requirements. All metrics are returned in pel coordinates. In OS/2 2.x, hvio cannot be zero. VioQuerySetIds ================================================================================ Query the list of local identifiers CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioQuerySetIds(PULONG lcids, PSTR8 Names, PULONG Types, ULONG count, HVIO hvio); PARAMETERS ---------- lcids (PULONG) - output An array of local identifiers output Names (PSTR8) - output An array of 8 character names associated with the lcids. Types (ULONG) - output An array of types accociated with each lcid count (PULONG) - input The number of objects to be queried. The maximum value in use is 3. hvio (HVIO) - input Vio presentation space handle. This is either zero to indicate the default Vio session, or a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- In OS/2 2.x, hvio cannot be zero. VioReadCellStr ================================================================================ This call reads a string of character-attribute pairs (cells) from the screen, starting at the specified location. CALL SYNTAX ----------- #define INCL_VIO APIRET VioReadCellStr(PCH CellStr, PULONG Length, ULONG Row, ULONG Column, HVIO hvio); PARAMETERS ---------- CellStr (PCH) - output Address of the buffer where the cell string is returned. Length (PULONG) - input/output Address of the buffer length in bytes. Length must take into account that each character-attribute(s) entry in the buffer is 2 or 4 bytes. If the length of the buffer is not sufficient, the last entry is not complete. Row (ULONG) - input Starting row of the field to read, 0 is the top row. Column (ULONG) - input Starting column of the field to read, 0 is the leftmost column. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If a string read comes to the end of the line and is not complete, the string read continues at the beginning of the next line. If the read comes to the end of the screen and is not complete, the read terminates and the length is set to the length of the buffer that was filled. VioReadCharStr ================================================================================ This call reads a string of characters from the display starting at the specified location. CALL SYNTAX ----------- #define INCL_VIO APIRET VioReadCharStr(PCH CharStr, PULONG Length, ULONG Row, ULONG Column, HVIO hvio); PARAMETERS ---------- CharStr (PCH) - output Address of the buffer where the character string is returned. Length (PULONG) - input/output Address of the buffer length in bytes. Row (ULONG) - input Starting row of the field to read, 0 is the top row. Column (ULONG) - input Starting column of the field to read, 0 is the leftmost column. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If a string read comes to the end of the line and is not complete, then the string read continues at the beginning of the next line. If the read comes to the end of the screen and is not complete, the read terminates and the length is set to the number of characters read. VioSavRedrawUndo ================================================================================ This call allows one thread within a process to cancel a VioSavRedrawWait issued by another thread within the same process. CALL SYNTAX ----------- #define INCL_VIO APIRET VioSavRedrawUndo(ULONG OwnerIndic, ULONG KillIndic, HVIO hvio); PARAMETERS ---------- OwnerIndic (ULONG) - input Indicates whether the thread issuing VioSavRedrawUndo wants ownership of VioSavRedrawWait to be reserved for its process. Value Definition 0 Reserve ownership 1 Give up ownership. KillIndic (ULONG) - input Indicates whether the thread with the outstanding VioSavRedrawWait should be returned an error code or be terminated. Value Definition 0 Return error code 1 Terminate thread. hvio (HVIO) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 422 ERROR_VIO_FUNCTION_OWNED 428 ERROR_VIO_NO_SAVE_RESTORE_THD 430 ERROR_VIO_ILLEGAL_DURING_POPUP 465 ERROR_VIO_DETACHED REMARKS ------- The issuing thread can reserve ownership of VioSavRedrawWait for its process or give it up. The thread whose VioSavRedrawWait was cancelled is optionally terminated. VioSavRedrawUndo may be issued only by a thread within the same process that owns VioSavRedrawWait. VioSavRedrawWait ================================================================================ This call notifies a graphics mode application when it must save or redraw its screen image. CALL SYNTAX ----------- #define INCL_VIO APIRET VioSavRedrawWait(ULONG SavRedrawIndic, ULONG NotifyType, HVIO hvio); PARAMETERS ---------- SavRedrawIndic (ULONG) - input Indicates which events the application is waiting for: Value Definition 0 The session manager notifies the application for both save and redraw operations. 1 The session manager notifies the application for redraw operations only. NotifyType (PULONG) - output Address that specifies the operation to be performed by the application upon return from VioSavRedrawWait: Value Definition 0 Save screen image 1 Restore screen image. hvio (HVIO) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 422 ERROR_VIO_FUNCTION_OWNED 423 ERROR_VIO_RETURN 430 ERROR_VIO_ILLEGAL_DURING_POPUP 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- OS/2 uses VioSavRedrawWait to notify a graphics mode application to save or restore its screen image at screen switch time. The application in the outgoing foreground session is notified to perform a save. The application in the incoming foreground session is notified to perform a restore. The application must perform the action requested and immediately re-issue VioSavRedrawWait. When an application performs a save, it saves its physical display buffer, video mode, and any other information the application needs to completely redraw its screen at restore time. Only one process per session can issue VioSavRedrawWait. The process that first issues VioSavRedrawWait becomes the owner of the function. A text mode application must issue VioSavRedrawWait only if the application writes directly to the registers on the display adapter. Assuming VioSavRedrawWait is not issued by a text mode application, OS/2 performs the required saves and restores. An application that issues VioSavRedrawWait may also need to issue VioModeWait. This would allow the application to be notified when it must restore its mode at the completion of an application or hard error pop-up. Refer to VioModeWait for more information. Two application threads would be required to perform these operations in this case. At the time a VioSavRedrawWait thread is notified, the session is in transition to/from the background. Although the session's official status is background, any selector to the physical display buffer previously obtained by the VioSavRedrawWait process (through VioGetPhysBuf) is valid at this time. The physical display buffer must be accessed without issuing VioScrLock. Since the session's official status is background, any thread waits if it issues VioScrLock with the "wait if unsuccessful" option. An application containing a VioSavRedrawWait thread should be designed so that the process does not cause any hard errors while the VioSavRedrawWait thread is running, otherwise a system lockout may occur. An application's VioSavRedrawWait thread may be notified to perform a restore before it is notified to perform a save. This happens if the application was running in the background the first time it issued VioSavRedrawWait. The return from this function call provides the notification. The thread that issues the call performs the save or redraw and then reissues VioSavRedrawWait to wait until its screen image must be saved or redrawn again. VioScrLock ================================================================================ This call requests ownership of (locks) the physical display buffer. CALL SYNTAX ----------- #define INCL_VIO APIRET VioScrLock(ULONG WaitFlag, PUCHAR Status, HVIO hvio); PARAMETERS ---------- WaitFlag (ULONG) - input Indicates whether the process should block until the screen I/O can take place. Value Definition 0 Return if screen I/O not available 1 Wait until screen I/O is available. Status (PUCHAR) - output Address of the Indicator of whether the lock is successful, described below. Value Definition 0 Lock successful 1 Lock unsuccessful (in the case of no wait). Status is returned only when AX = 0. Status = 1 may be returned only when WaitFlag = 0. hvio (HVIO) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 366 ERROR_VIO_WAIT_FLAG 430 ERROR_VIO_ILLEGAL_DURING_POPUP 434 ERROR_VIO_LOCK 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- This function call permits a process to determine if I/O to the physical screen buffer can take place. This prevents the process from writing to the physical buffer when the process is in the background. Processes must cooperate with the system in coordinating screen accesses. Screen switching is disabled while the screen lock is in place. If a screen switch is suspended by a screen lock, and if the application holding the lock does not issue VioScrUnLock within a system-defined time limit, the screen switch occurs, and the process holding the lock is frozen in the background. A process should yield the screen lock as soon as possible to avoid being frozen when running in the background. The timeout on the lock does not begin until a screen switch is requested. When the screen lock is in effect and another thread in the same or different process (in the same session) issues VioScrLock, the second thread receives an error code. VioScrUnLock must be issued by a thread within the same process that issued VioScrLock. VioScrollDown ================================================================================ This call scrolls the entire display buffer (or area specified within the display buffer) down. CALL SYNTAX ----------- #define INCL_VIO APIRET VioScrollDown(ULONG TopRow, ULONG LeftCol, ULONG BotRow, ULONG RightCol, ULONG Lines, PBYTE Cell, HVIO hvio); PARAMETERS ---------- TopRow (ULONG) - input Top row to be scrolled. LeftCol (ULONG) - input Left column to be scrolled. BotRow (ULONG) - input Bottom row to be scrolled. RightCol (ULONG) - input Right column to be scrolled. Lines (ULONG) - input Number of lines to be inserted at the top of the screen area being scrolled. If 0 is specified, no lines are scrolled. Cell (PBYTE) - input Address of the character-attribute(s) pair (2 or 4 bytes) used as a fill character on inserted lines. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- TopRow = 0 and LeftCol = 0 identifies the top left corner of the screen. If a value greater than the maximum value is specified for TopRow, LeftCol, BotRow, RightCol, or Lines, the maximum value for that parameter is used. If TopRow and LeftCol = 0 and if BotRow, RightCol, and Lines is greater than the screen lines, the entire screen is filled with the character-attribute pair defined by Cell. VioScrollLeft ================================================================================ This call scrolls the entire display buffer (or area specified within the display buffer) to the left. CALL SYNTAX ----------- #define INCL_VIO APIRET VioScrollLeft(ULONG TopRow, ULONG LeftCol, ULONG BotRow, ULONG RightCol, ULONG Lines, PBYTE Cell, HVIO hvio); PARAMETERS ---------- TopRow (ULONG) - input Top row to be scrolled. LeftCol (ULONG) - input Left column to be scrolled. BotRow (ULONG) - input Bottom row to be scrolled. RightCol (ULONG) - input Right column to be scrolled. Lines (ULONG) - input Number of columns to be inserted at the right of the screen area being scrolled. If 0 is specified, no lines are scrolled. Cell (PBYTE) - input Address of the character attribute(s) pair (2 or 4 bytes) used as a fill character on inserted columns. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- TopRow = 0 and LeftCol = 0 identifies the top left corner of the screen. If a value greater than the maximum value is specified for TopRow, LeftCol, BotRow, RightCol, or Lines, the maximum value for that parameter is used. If TopRow and LeftCol = 0 and if BotRow, RightCol, and Lines is greater than the screen lines, the entire screen is filled with the character-attribute pair defined by Cell. VioScrollRight ================================================================================ This call scrolls the entire display buffer (or area specified within the display buffer) to the right. CALL SYNTAX ----------- #define INCL_VIO APIRET VioScrollRight(ULONG TopRow, ULONG LeftCol, ULONG BotRow, ULONG RightCol, ULONG Lines, PBYTE Cell, HVIO hvio); PARAMETERS ---------- TopRow (ULONG) - input Top row to be scrolled. LeftCol (ULONG) - input Left column to be scrolled. BotRow (ULONG) - input Bottom row to be scrolled. RightCol (ULONG) - input Right column to be scrolled. Lines (ULONG) - input Number of columns to be inserted at the left of the screen area being scrolled. If 0 is specified, no lines are scrolled. Cell (PBYTE) - input Address of the character attribute(s) pair (2 or 4 bytes) used as a fill character on inserted columns. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- TopRow = 0 and LeftCol = 0 identifies the top left corner of the screen. If a value greater than the maximum value is specified for TopRow, LeftCol, BotRow, RightCol, or Lines, the maximum value for that parameter is used. If TopRow and LeftCol = 0 and if BotRow, RightCol, and Lines is larger than the screen lines, the entire screen is filled with the character and attribute defined by Cell. VioScrollUp ================================================================================ This call scrolls the entire display buffer (or area specified within the display buffer) up. CALL SYNTAX ----------- #define INCL_VIO APIRET VioScrollUp(ULONG TopRow, ULONG LeftCol, ULONG BotRow, ULONG RightCol, ULONG Lines, PBYTE Cell, HVIO hvio); PARAMETERS ---------- TopRow (ULONG) - input Top row to be scrolled. LeftCol (ULONG) - input Left column to be scrolled. BotRow (ULONG) - input Bottom row to be scrolled. RightCol (ULONG) - input Right column to be scrolled. Lines (ULONG) - input Number of lines to be inserted at the bottom of the screen area being scrolled. If 0 is specified, no lines are scrolled. Cell (PBYTE) - input Address of the character attribute(s) pair (2 or 4 bytes) used as a fill character on inserted lines. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- TopRow = 0 and LeftCol = 0 identifies the top left corner of the screen. If a value greater than the maximum value is specified for TopRow, LeftCol, BotRow, RightCol, or Lines, the maximum value for that parameter is used. If TopRow and LeftCol = 0 and if BotRow, RightCol, and Lines is larger than the screen lines, the entire screen is filled with the character-attribute pair defined by Cell. VioScrUnLock ================================================================================ This call releases ownership of (unlocks) the physical display buffer. CALL SYNTAX ----------- #define INCL_VIO APIRET VioScrUnLock(HVIO hvio); PARAMETERS ---------- hvio (HVIO) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 367 ERROR_VIO_UNLOCK 430 ERROR_VIO_ILLEGAL_DURING_POPUP 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- This call releases the screen lock that is set by VioScrLock. The VioScrUnLock call must be issued by a thread in the same process as the thread that issued VioScrLock. VioSetAnsi ================================================================================ This call activates or deactivates ANSI support. CALL SYNTAX ----------- #define INCL_VIO APIRET VioSetAnsi(ULONG Indicator, HVIO hvio); PARAMETERS ---------- Indicator (ULONG) - input Equals 1 to activate ANSI support or 0 to deactivate ANSI. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 421 ERROR_VIO_INVALID_PARMS 430 ERROR_VIO_ILLEGAL_DURING_POPUP 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- For ANSI support, "ON" is the default. VioSetCp ================================================================================ This call allows a process to set the code page used to display text data on the screen for the specified handle. CALL SYNTAX ----------- #define INCL_VIO APIRET VioSetCp(ULONG Reserved, USHORT CodePageID, HVIO hvio); PARAMETERS ---------- Reserved (ULONG) - input Reserved value, must be zero. CodePageID (USHORT) - input The CodePageID must be a known codepage. Note that the values 0, -1, and -2 which are supported by OS/2 2.x will cause an error in Workplace OS/2. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED 469 ERROR_VIO_BAD_CP 470 ERROR_VIO_NO_CP 471 ERROR_VIO_NA_CP REMARKS ------- The specified codepage applies to all new characters. How VioSetCp acts on characters already in the video buffer is undefined. VioSetCurPos ================================================================================ This call sets the cursor's coordinates on the screen. CALL SYNTAX ----------- #define INCL_VIO APIRET VioSetCurPos(ULONG Row, ULONG Column, HVIO hvio); PARAMETERS ---------- Row (ULONG) - input New cursor row position, 0 is the top row. Column (ULONG) - input New cursor column position, 0 is the leftmost column. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED VioSetCurType ================================================================================ This call sets the cursor type. CALL SYNTAX ----------- typedef struct _VIOCURSORINFO { /* vioci */ USHORT yStart; /* cursor start line */ USHORT cEnd; /* cursor end line */ USHORT cx; /* cursor width */ USHORT attr; /* -1=hidden cursor */ } VIOCURSORINFO; #define INCL_VIO APIRET VioSetCurType(PVIOCURSORINFO CursorData, HVIO hvio); PARAMETERS ---------- CursorData (PVIOCURSORINFO) - input Address of the cursor characteristics structure: startline (USHORT) Horizontal scan line in the character cell that marks the top line of the cursor. If the character cell has n scan lines, 0 is the top scan line of the character cell and (n - 1) is the bottom scan line. endline (USHORT) Horizontal scan line in the character cell that marks the bottom line of the cursor. Scan lines within a character cell are numbered as defined in startline. The maximum value allowed is 31. cursorwidth (USHORT) Width of the cursor. In text modes, cursorwidth is the number of columns. The maximum number supported by the OS/2 base video subsystem is 1. In graphics modes, cursorwidth is the number of pels. A value of 0 specifies the default width. In text modes, this is 1 column. In graphics modes, this is the number of pels equivalent to the width of one character. cursorattrib (USHORT) A value of -1 denotes a hidden cursor, all other values denote a normal cursor. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 356 ERROR_VIO_WIDTH 421 ERROR_VIO_INVALID_PARMS 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- To set CursorStartLine and CursorEndLine independent of the number of scan lines for each character cell, you may specify these parameters as percentages. OS/2 then calculates the physical start and end scan lines, respectively, by multiplying the percentage specified for the parameter by the total number of scan lines in the character cell and rounding to the nearest scan line. Percentages are specified as negative values (or 0) in the range 0 through -100. Specifying CursorStartLine = -90 and CursorEndLine = -100 requests a cursor that occupies the bottom 10 percent of the character cell. The actual appearance of the cursor is hardware dependent. The video hardware may not support the specified parameters. VioSetDeviceCellSize ================================================================================ Sets the size of the current character cell in pels CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioSetDeviceCellSize(ULONG Height, ULONG Width, HVIO hvio); PARAMETERS ---------- Height (ULONG) - input Height of the character cell in pels Width (ULONG) - input Width of the character cell in pels hvio (HVIO) - input Vio presentation space handle. This is either zero to indicate the default Vio session, or a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- If the device does not support the specified cell size, the cell size closest to the specified size is used. VioGetDeviceCellSize can be used to find the actual size selected. In OS/2 2.x, hvio cannot be zero. VioSetMode ================================================================================ This call sets the mode of the display. CALL SYNTAX ----------- typedef struct _VIOMODEINFO { USHORT cb; /* Length of the entire data structure */ UCHAR fbType; /* Bit mask of mode being set */ UCHAR color; /* Number of colors (power of 2) */ USHORT col; /* Number of text columns */ USHORT row; /* Number of text rows */ USHORT hres; /* Horizontal resolution */ USHORT vres; /* Vertical resolution */ UCHAR fmt_ID; /* Attribute format */ UCHAR attrib; /* Number of attributes */ ULONG buf_addr; ULONG buf_length; ULONG full_length; ULONG partial_length; PCH ext_data_addr; } VIOMODEINFO; typedef VIOMODEINFO far *PVIOMODEINFO; #define INCL_VIO APIRET VioSetMode(PVIOMODEINFO ModeData, HVIO hvio); PARAMETERS ---------- ModeData (PVIOMODEINFO) - input Address of the mode characteristics structure: length (USHORT) Input parameter to VioSetMode. Length specifies the length of the data structure in bytes including Length itself. The minimum structure size required is 3 bytes. OS/2 sets to the first mode (in the list of modes supported by this display configuration) with a data structure matching the mode data specified. type (UCHAR) Mode characteristics bit mask: Bit Description 7-4 Reserved, set to zero. 3 0 = VGA BIOS compatible modes 1 = Native mode. 2 0 = Enable color burst 1 = Disable color burst. 1 0 = Text mode. 1 = Graphics mode. 0 0 = Monochrome compatible mode. 1 = Other. numcolors (UCHAR) Number of colors defined as a power of 2. This is equivalent to the number of color bits that define the color, for example: Value Definition 0 Monochrome 1 2 colors. 2 4 colors. 4 16 colors. 8 256 colors. 16 64K colors. 24 16M colors. textcols (USHORT) Number of text columns. textrows (USHORT) Number of text rows. pelcols (USHORT) Horizontal resolution, number of pel columns. pelrows (USHORT) Vertical resolution, number of pel rows. Attribute Format (UCHAR) Identifies the format of the attributes. Number of Attributes (UCHAR) Identifies the number of attributes in a character cell. Buffer Address (ULONG) Physical address of the physical display aperture. Buffer Length (ULONG) Length of the physical display aperture. Full Buffer Size (ULONG) Size of the buffer required for a full save of the physical display buffer for this mode. Partial Buffer Size (ULONG) Size of the buffer required for a partial (pop-up) save of the physical display buffer for this mode. Extended Data Area Address (PCH) Virtual address to an extended mode data structure or zero if none. The format of the extended mode data structure is determined by the device driver and is unknown to OS/2. hvio (HVIO) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 430 ERROR_VIO_ILLEGAL_DURING_POPUP 436 ERROR_VIO_INVALID_HANDLE 438 ERROR_VIO_INVALID_LENGTH 465 ERROR_VIO_DETACHED 467 ERROR_VIO_FONT REMARKS ------- VioSetMode initializes the cursor position and type. VioSetMode does not clear the screen if the new and old modes are compatible. To clear the screen, use one of the VioScrollxx calls. Assuming no target display configuration for VioSetMode is selected, the mode is set on the primary configuration. If the primary configuration does not support the mode specified, the mode is set on the secondary configuration. VioSetOrigin ================================================================================ Set the position at which the presentation space maps to the window CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioSetOrigin(ULONG Row, ULONG Column, HVIO hvio); PARAMETERS ---------- Height (ULONG) - input Topmost row shown in the window Width (ULONG) - input Leftmost column shown in the window hvio (HVIO) - input Vio presentation space handle. This is either zero to indicate the default Vio session, or a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- This call is used when the presentation space is larger than the window size to control which part of the presentation space is displayed. It does not itself cause any output to be displayed. In OS/2 2.x, hvio cannot be zero. VioSetState ================================================================================ This call performs one of the following functions; set palette registers, sets the overscan (border) color, set the blink/background intensity switch, set color registers, set the underline location, or set the target VioSetMode display configuration. CALL SYNTAX ----------- #define INCL_VIO APIRET VioSetState(PVOID RequestBlock, HVIO hvio); PARAMETERS ---------- RequestBlock (PVOID) - input Address of the video state structures consisting of six different structures depending on the request type: Type Definition 0 Set palette registers 1 Set overscan (border) color 2 Set blink/background intensity switch 3 Set color registers 4 Reserved 5 Set underline location 6 Set target VioSetMode display configuration The six structures, depending on request type, are: VIOPALSTATE length (USHORT) - input Length of structure, including length. 38 Maximum valid value. reqtype (USHORT) - input Request type 0 for palette registers. palette (USHORT) - input First palette register in the palette register sequence; must be specified in the range 0 through 15. The palette registers are returned in sequential order. The number returned is based upon length. color (USHORT*(length-6)/2) - input Color value for each palette register. The maximum number of entries in the color value array is 16. VIOOVERSCAN length (USHORT) - input Length of structure, including length. 6 Only valid value. reqtype (USHORT) - input Request type 1 for overscan (border) color. color (USHORT) - input Color value. VIOINTENSITY length (USHORT) - input Length of structure, including length. 6 Only valid value. reqtype (USHORT) - input Request type 2 for blink/background intensity switch. switch (USHORT) - input Switch set as: Value Definition 0 Blinking foreground colors enabled. 1 High intensity background colors enabled. VIOCOLORREG length (USHORT) - input Length of structure, including length. 12 Only valid value. type (USHORT) - input Request type 3 for color registers. first color (USHORT) - input First color register to set in the color register sequence; must be specified in the range 0 through 255. The color registers are set in sequential order. number color (USHORT) - input Number of color registers to set; must be specified in the range 1 through 256. datarea (PCH) - input Far address of a data area containing one three-byte entry for each color register to be set. The format of each entry is as follows: Byte 1 Red value Byte 2 Green value Byte 3 Blue value. VIOSETULINELOC length (USHORT) - input Length of structure, including length. 6 Only valid value. type (USHORT) - input Request type 5 to set the scan line for underlining. Underlining is enabled only when the foreground color is 1 or 9. scanline (USHORT) - input Scan line minus 1. Values of 0 through 31 are acceptable. A value of 32 means underlining is disabled. VIOSETTARGET length (USHORT) - input Length of structure, including length. 6 Only valid value. type (USHORT) - input Request type 6 to set display configuration to be the target of the next VioSetMode. select (USHORT) - input Configuration: Value Definition 0 Default selection algorithm. See VioSetMode. 1 Primary 2 Secondary. hvio (HVIO) - input Reserved value, must be zero. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 421 ERROR_VIO_INVALID_PARMS 436 ERROR_VIO_INVALID_HANDLE 438 ERROR_VIO_INVALID_LENGTH 465 ERROR_VIO_DETACHED REMARKS ------- Note: VioSetState allows setting of hardware dependent features. Not all video hardware will honor these settings. VioShowBuf ================================================================================ This call updates the physical display buffer with the logical video buffer (LVB). CALL SYNTAX ----------- #define INCL_VIO APIRET VioShowBuf(ULONG Offset, ULONG Length, HVIO hvio); PARAMETERS ---------- Offset (ULONG) - input Starting offset within the logical video buffer at which the update to the screen is to start. Length (ULONG) - input Length of the area to be updated to the screen. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 430 ERROR_VIO_ILLEGAL_DURING_POPUP 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- VioShowBuf is ignored unless it is issued by a process that has previously called VioGetBuf and that is currently executing in the foreground. VioShowPS ================================================================================ Update the disply of the Vio presentation space CALL SYNTAX ----------- #define INCL_VIO APIRET APIENTRY VioShowPS(ULONG Depth, ULONG Width, ULONG Cell, HVIO hvio); PARAMETERS ---------- Depth (ULONG) - input Depth of the updated rectangle Width (ULONG) - input Width of the updated rectangle Cell (ULONG) Offset to the first updated cell. The offset of the top, left corner is zero. hvio (HVIO) - input Vio presentation space handle. This is either zero to indicate the default Vio session, or a value returned by VioCreatePS. RETURNS ------- Return code descriptions are: 0 NO_ERROR 421 ERROR_VIO_INVALID_PARMS 436 ERROR_VIO_INVALID_HANDLE REMARKS ------- This call is used to specify that part or all of the presentation space logical buffer needs to be redrawn. This call has the same function as VioShowBuf, but the area to update is specified differently. VioWrtCellStr ================================================================================ This call writes a string of character-attribute pairs (cells) to the display. CALL SYNTAX ----------- #define INCL_VIO APIRET VioWrtCellStr(PCH CellStr, ULONG Length, ULONG Row, ULONG Column, HVIO hvio); PARAMETERS ---------- CellStr (PCH) - input Address of the string of character-attribute(s) cells to be written. Length (ULONG) - input Length, in bytes, of the string to be written. Each character-attribute(s) cell is 2 or 4 bytes. Row (ULONG) - input Starting cursor row. Column (ULONG) - input Starting cursor column. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If a string write gets to the end of the line and is not complete, the string write continues at the beginning of the next line. If the write gets to the end of the screen, the write terminates. VioWrtCharStr ================================================================================ This call writes a character string to the display. CALL SYNTAX ----------- #define INCL_VIO APIRET VioWrtCharStr(PCH CharStr, ULONG Length, ULONG Row, ULONG Column, HVIO hvio); PARAMETERS ---------- CharStr (PCH) - input Address of the character string to be written. Length (ULONG) - input Length, in bytes, of the character string. Row (ULONG) - input Starting cursor row. Column (ULONG) - input Starting cursor column. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If a string write gets to the end of the line and is not complete, the string write continues at the beginning of the next line. If the write gets to the end of the screen, the write terminates. VioWrtCharStrAttr ================================================================================ This call writes a character string with repeated attribute to the display. CALL SYNTAX ----------- #define INCL_VIO APIRET VioWrtCharStrAtt(PCH CharStr, ULONG Length, ULONG Row, ULONG Column, PBYTE Attr, HVIO hvio); PARAMETERS ---------- CharStr (PCH) - input Address of the character string to be written. Length (ULONG) - input Length, in bytes, of the character string. Row (ULONG) - input Starting cursor row. Column (ULONG) - input Starting cursor column. Attr (PBYTE) - input Address of the attribute(s) (1 or 3 bytes) to be used in the display buffer for each character of the string written. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If a string write gets to the end of the line and is not complete, the string write continues at the beginning of the next line. If the write gets to the end of the screen, the write terminates. VioWrtNAttr ================================================================================ This call writes an attribute to the display a specified number of times. CALL SYNTAX ----------- #define INCL_VIO APIRET VioWrtNAttr(PBYTE Attr, ULONG Times, ULONG Row, ULONG Column, HVIO hvio); PARAMETERS ---------- Attr (PBYTE) - input Address of the attribute(s) (1 or 3 bytes) to be written. Times (ULONG) - input Number of times to write the attribute. Row (ULONG) - input Starting cursor row. Column (ULONG) - input Starting cursor column. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If a repeated write gets to the end of the line and is not complete, the write continues at the beginning of the next line. If the write gets to the end of the screen, the write terminates. VioWrtNCell ================================================================================ This call writes a cell (character-attribute pair) to the display a specified number of times. CALL SYNTAX ----------- #define INCL_VIO APIRET VioWrtNCell(PBYTE Cell, ULONG Times, ULONG Row, ULONG Column, HVIO hvio); PARAMETERS ---------- Cell (PBYTE) - input Address of the character-attribute(s) cell (2 or 4 bytes) to be written. Times (ULONG) - input Number of times to write the cell. Row (ULONG) - input Starting cursor row. Column (ULONG) - input Starting cursor column. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If a repeated write gets to the end of the line and is not complete, the write continues at the beginning of the next line. If the write gets to the end of the screen, the write terminates. VioWrtNChar ================================================================================ VioWrtNChar writes a character to the display a specified number of times. CALL SYNTAX ----------- #define INCL_VIO APIRET VioWrtNChar(PCH Char, ULONG Times, ULONG Row, ULONG Column, HVIO hvio); PARAMETERS ---------- Char (PCH) - input Address of the character to be written. Times (ULONG) - input Number of times to write the character. Row (ULONG) - input Starting cursor row. Column (ULONG) - input Starting cursor column. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 358 ERROR_VIO_ROW 359 ERROR_VIO_COL 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If a repeated write gets to the end of the line and is not complete, the write continues at the beginning of the next line. If the write gets to the end of the screen, the write terminates. VioWrtTTY ================================================================================ This call writes a character string to the display starting at the current cursor position. At the completion of the write, the cursor is positioned at the first position beyond the end of the string. CALL SYNTAX ----------- #define INCL_VIO APIRET VioWrtTTY(PCH CharStr, ULONG Length, HVIO hvio); PARAMETERS ---------- CharStr (PCH) - input Address of the string to be written. Length (ULONG) - input Length of the character string in bytes. hvio (HVIO) - input This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs. RETURNS ------- Return code descriptions are: 0 NO_ERROR 355 ERROR_VIO_MODE 436 ERROR_VIO_INVALID_HANDLE 465 ERROR_VIO_DETACHED REMARKS ------- If a string write gets to the end of the line and is not complete, the string write continues at the beginning of the next line. If the write gets to the end of the screen, the screen is scrolled, and the write continues until completed. The characters carriage return, line feed, backspace, tab, and bell are treated as commands rather than printable characters. Backspace is a non-destructive backspace. Tabs are expanded to provide standard 8-byte-wide fields. VioWrtTTY is the only video call affected by ANSI. Characters are written using the current attribute defined by ANSI or the default value 7. WinDefAVioWindowProc ================================================================================ This call invodes the default AVIO window procedure. CALL SYNTAX ----------- #define INCL_AVIO MRESULT APIENTRY WinDefAVioWindowProc(HWND hwnd, ULONG msg, ULONG mp1, ULONG mp2); PARAMETERS ---------- hwnd (HWND) - input Window handle. msg (ULONG) - input Message identity mp1 (ULONG) - input Parameter 1 mp2 (ULONG) - input Parameter 2 REMARKS: Applications using AVIO must pass all WM_SIZE messages for the window with which the AVIO presentation space is associated to this routine using the same parameters as are received in the WM_SIZE message. This routine maintains the window size data in the presentation space, and must be called before the application accesses the window. This call is not a replacement for WinDefWindowProc which must also be called to process any messages which have not been handled by the application's window procudure.