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OS/2 Shareware BBS: 10 Tools
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STDWND
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HELLO.C
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C/C++ Source or Header
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1994-12-13
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14KB
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346 lines
/*************** Hello C Sample Program Source Code File (.C) **************
*
* PROGRAM NAME: HELLO
* -------------
* Presentation Manager Standard Window C Sample Program
*
* REVISION LEVEL: 2.0
* ---------------
*
* WHAT THIS PROGRAM DOES:
* -----------------------
* This program displays a standard window containing the text "Hello".
* The action bar contains a single choice, Options.
* The Options pull-down contains three choices that each
* paint a different string in the window.
*
* WHAT THIS PROGRAM DEMONSTRATES:
* -------------------------------
* This program demonstrates how to create and display a standard window,
* and how to use resources defined in a resource script file.
*
* WHAT YOU NEED TO COMPILE THIS PROGRAM:
* --------------------------------------
*
* REQUIRED FILES:
* ---------------
*
* HELLO.C - Source code
* HELLO.MAK - Make file for this program
* HELLO.DEF - Module definition file
* HELLO.H - Application header file
* HELLO.ICO - Icon file
* HELLO.L - Linker automatic response file
* HELLO.RC - Resource file
*
* OS2.H - Presentation Manager include file
* STRING.H - String handling function declarations
*
* REQUIRED LIBRARIES:
* -------------------
*
* OS2386.LIB - Presentation Manager/OS2 library
* LIBC.LIB - Protect mode/standard combined small model C library
*
* REQUIRED PROGRAMS:
* ------------------
* IBM C Compiler
* IBM Linker
* Resource Compiler
*
* Copyright (C) 1991 IBM Corporation
*
* DISCLAIMER OF WARRANTIES. The following [enclosed] code is
* sample code created by IBM Corporation. This sample code is not
* part of any standard or IBM product and is provided to you solely
* for the purpose of assisting you in the development of your
* applications. The code is provided "AS IS", without
* warranty of any kind. IBM shall not be liable for any damages
* arising out of your use of the sample code, even if they have been
* advised of the possibility of such damages. *
******************************************************************************/
#define INCL_WIN
#define INCL_GPI
#include <os2.h> /* PM header file */
#include "hello.h" /* Resource symbolic identifiers*/
#define STRINGLENGTH 20 /* Length of string */
/*
* Function prototypes
*/
MRESULT EXPENTRY MyWindowProc( HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2 );
/* Define parameters by type */
HAB hab; /* PM anchor block handle */
CHAR szHello[STRINGLENGTH]; /* String parameters, set in */
CHAR sz1[STRINGLENGTH]; /* the processing of WM_CREATE, */
CHAR sz2[STRINGLENGTH]; /* and used in the processing */
CHAR sz3[STRINGLENGTH]; /* of WM_COMMAND, in window */
CHAR szString[STRINGLENGTH]; /* procedure. */
PSZ pszErrMsg;
/**************************************************************************
*
* Name : main()
*
* Description: Initializes the process for OS/2 PM services and
* process the application message queue until a
* WM_QUIT message is received. It then destroys all
* OS/2 PM resources and terminates.
*
* Concepts : - obtains anchor block handle and creates message
* queue
* - creates the main frame window which creates the
* main client window
* - polls the message queue via Get/Dispatch Msg loop
* - upon exiting the loop, exits
*
* API's : WinInitialize
* WinCreateMsgQueue
* WinTerminate
* WinSetWindowPos
* WinSetWindowText
* WinRegisterClass
* WinCreateStdWindow
* WinGetMsg
* WinDispatchMsg
* WinDestroyWindow
* WinDestroyMsgQueue
*
* Parameters : [none]
*
* Return : 1 - if successful execution completed
* 0 - if error
*
*************************************************************************/
INT main (VOID)
{
HMQ hmq; /* Message queue handle */
HWND hwndClient = NULLHANDLE; /* Client area window handle */
HWND hwndFrame = NULLHANDLE; /* Frame window handle */
QMSG qmsg; /* Message from message queue */
ULONG flCreate; /* Window creation control flags*/
if ((hab = WinInitialize(0)) == 0L) /* Initialize PM */
AbortHello(hwndFrame, hwndClient); /* Terminate the application */
if ((hmq = WinCreateMsgQueue( hab, 0 )) == 0L)/* Create a msg queue */
AbortHello(hwndFrame, hwndClient); /* Terminate the application */
if (!WinRegisterClass( /* Register window class */
hab, /* Anchor block handle */
(PSZ)"MyWindow", /* Window class name */
(PFNWP)MyWindowProc, /* Address of window procedure */
CS_SIZEREDRAW, /* Class style */
0 /* No extra window words */
))
AbortHello(hwndFrame, hwndClient); /* Terminate the application */
flCreate = FCF_STANDARD & /* Set frame control flags to */
~FCF_SHELLPOSITION; /* standard except for shell */
/* positioning. */
if ((hwndFrame = WinCreateStdWindow(
HWND_DESKTOP, /* Desktop window is parent */
0, /* STD. window styles */
&flCreate, /* Frame control flag */
"MyWindow", /* Client window class name */
"", /* No window text */
0, /* No special class style */
(HMODULE)0L, /* Resource is in .EXE file */
ID_WINDOW, /* Frame window identifier */
&hwndClient /* Client window handle */
)) == 0L)
AbortHello(hwndFrame, hwndClient); /* Terminate the application */
WinSetWindowText(hwndFrame, "HELLO SAMPLE");
if (!WinSetWindowPos( hwndFrame, /* Shows and activates frame */
HWND_TOP, /* window at position 100, 100, */
100, 100, 200, 200, /* and size 200, 200. */
SWP_SIZE | SWP_MOVE | SWP_ACTIVATE | SWP_SHOW
))
AbortHello(hwndFrame, hwndClient); /* Terminate the application */
/*
* Get and dispatch messages from the application message queue
* until WinGetMsg returns FALSE, indicating a WM_QUIT message.
*/
while( WinGetMsg( hab, &qmsg, 0L, 0, 0 ) )
WinDispatchMsg( hab, &qmsg );
WinDestroyWindow(hwndFrame); /* Tidy up... */
WinDestroyMsgQueue( hmq ); /* Tidy up... */
WinTerminate( hab ); /* Terminate the application */
} /* End of main */
/**************************************************************************
*
* Name : MyWindowProc
*
* Description: The window procedure associated with the client area in
* the standard frame window. It processes all messages
* either sent or posted to the client area, depending on
* the message command and parameters.
*
* Concepts :
*
* API's : WinLoadString
* WinInvalidateRegion
* WinPostMsg
* WinDefWindowProc
* WinBeginPaint
* GpiSetColor
* GpiSetBackColor
* GpiSetBackMix
* GpiCharStringAt
* WinEndPaint
*
* Parameters : hwnd = window handle
* msg = message code
* mp1 = first message parameter
* mp2 = second message parameter
*
* Return : depends on message sent
*
*************************************************************************/
MRESULT EXPENTRY MyWindowProc( HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2 )
{
switch( msg )
{
case WM_CREATE:
/*
* Window initialization is performed here in WM_CREATE processing
* WinLoadString loads strings from the resource file.
*/
WinLoadString( hab, (HMODULE)0L, IDS_HELLO, STRINGLENGTH, szHello );
WinLoadString( hab, (HMODULE)0L, IDS_1, STRINGLENGTH, sz1 );
WinLoadString( hab, (HMODULE)0L, IDS_2, STRINGLENGTH, sz2 );
WinLoadString( hab, (HMODULE)0L, IDS_3, STRINGLENGTH, sz3 );
strcpy( szString, szHello ); /* Copy text Hello into szString*/
break;
case WM_COMMAND:
/*
* When the user chooses option 1, 2, or 3 from the Options pull-
* down, the text string is set to 1, 2, or 3, and
* WinInvalidateRegion sends a WM_PAINT message.
* When Exit is chosen, the application posts itself a WM_CLOSE
* message.
*/
{
USHORT command; /* WM_COMMAND command value */
command = SHORT1FROMMP(mp1); /* Extract the command value */
switch (command)
{
case ID_OPTION1:
strcpy( szString, sz1 );
WinInvalidateRegion( hwnd, 0L, FALSE );
break;
case ID_OPTION2:
strcpy( szString, sz2 );
WinInvalidateRegion( hwnd, 0L, FALSE );
break;
case ID_OPTION3:
strcpy( szString, sz3 );
WinInvalidateRegion( hwnd, 0L, FALSE );
break;
case ID_EXITPROG:
WinPostMsg( hwnd, WM_CLOSE, (MPARAM)0, (MPARAM)0 );
break;
default:
return WinDefWindowProc( hwnd, msg, mp1, mp2 );
}
break;
}
case WM_ERASEBACKGROUND:
/*
* Return TRUE to request PM to paint the window background
* in SYSCLR_WINDOW.
*/
return (MRESULT)( TRUE );
case WM_PAINT:
/*
* Window contents are drawn here in WM_PAINT processing.
*/
{
HPS hps; /* Presentation Space handle */
RECTL rc; /* Rectangle coordinates */
POINTL pt; /* String screen coordinates */
/* Create a presentation space */
hps = WinBeginPaint( hwnd, 0L, &rc );
WinFillRect( hps, &rc, SYSCLR_WINDOW);
pt.x = 50; pt.y = 50; /* Set the text coordinates, */
GpiSetColor( hps, CLR_NEUTRAL ); /* colour of the text, */
GpiSetBackColor( hps, CLR_BACKGROUND ); /* its background and */
GpiSetBackMix( hps, BM_OVERPAINT ); /* how it mixes, */
/* and draw the string...*/
GpiCharStringAt( hps, &pt, (LONG)strlen( szString ), szString );
WinEndPaint( hps ); /* Drawing is complete */
break;
}
case WM_CLOSE:
/*
* This is the place to put your termination routines
*/
WinPostMsg( hwnd, WM_QUIT, (MPARAM)0,(MPARAM)0 );/* Cause termination*/
break;
default:
/*
* Everything else comes here. This call MUST exist
* in your window procedure.
*/
return WinDefWindowProc( hwnd, msg, mp1, mp2 );
}
return (MRESULT)FALSE;
} /* End of MyWindowProc */
/**************************************************************************
*
* Name : AbortHello
*
* Description: Report an error returned from an API service
*
* Concepts : use of message box to display information
*
* API's : DosBeep
* WinGetErrorInfo
* WinMessageBox
* WinFreeErrorInfo
* WinPostMsg
*
* Parameters : hwndFrame = frame window handle
* hwndClient = client window handle
*
* Return : [none]
*
*************************************************************************/
VOID AbortHello(HWND hwndFrame, HWND hwndClient)
{
PERRINFO pErrInfoBlk;
PSZ pszOffSet;
void stdprint(void);
DosBeep(100,10);
if ((pErrInfoBlk = WinGetErrorInfo(hab)) != (PERRINFO)NULL)
{
pszOffSet = ((PSZ)pErrInfoBlk) + pErrInfoBlk->offaoffszMsg;
pszErrMsg = ((PSZ)pErrInfoBlk) + *((PSHORT)pszOffSet);
if((INT)hwndFrame && (INT)hwndClient)
WinMessageBox(HWND_DESKTOP, /* Parent window is desk top */
hwndFrame, /* Owner window is our frame */
(PSZ)pszErrMsg, /* PMWIN Error message */
"Error Msg", /* Title bar message */
MSGBOXID, /* Message identifier */
MB_MOVEABLE | MB_CUACRITICAL | MB_CANCEL ); /* Flags */
WinFreeErrorInfo(pErrInfoBlk);
}
WinPostMsg(hwndClient, WM_QUIT, (MPARAM)NULL, (MPARAM)NULL);
} /* End of AbortHello */
/*********************** End of the hello.c *******************************/