SGI Freeware 1999 August

home *** CD-ROM | disk | FTP | other *** search

/ SGI Freeware 1999 August / SGI Freeware 1999 August.iso / dist / fw_qt.idb / usr / freeware / catman / p_man / cat3 / qiodevice.Z / qiodevice

Wrap

Text File | 1998-10-28 | 29.4 KB | 595 lines

QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) TTTTrrrroooollllllll TTTTeeeecccchhhh AAAASSSS ((((9999 JJJJuuuullllyyyy 1111999999998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) NNNNAAAAMMMMEEEE QIODevice - The base class of I/O devices SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS #include <qiodevice.h> Inherited by QBuffer and QFile. PPPPuuuubbbblllliiiicccc MMMMeeeemmmmbbbbeeeerrrrssss QQQQIIIIOOOODDDDeeeevvvviiiicccceeee (((()))) vvvviiiirrrrttttuuuuaaaallll ~~~~QQQQIIIIOOOODDDDeeeevvvviiiicccceeee () iiiinnnntttt ffffllllaaaaggggssss (((()))) ccccoooonnnnsssstttt iiiinnnntttt mmmmooooddddeeee (((()))) ccccoooonnnnsssstttt iiiinnnntttt ssssttttaaaatttteeee (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssDDDDiiiirrrreeeeccccttttAAAAcccccccceeeessssssss (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssSSSSeeeeqqqquuuueeeennnnttttiiiiaaaallllAAAAcccccccceeeessssssss (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssCCCCoooommmmbbbbiiiinnnneeeeddddAAAAcccccccceeeessssssss (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssBBBBuuuuffffffffeeeerrrreeeedddd (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssRRRRaaaawwww (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssSSSSyyyynnnncccchhhhrrrroooonnnnoooouuuussss (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssAAAAssssyyyynnnncccchhhhrrrroooonnnnoooouuuussss (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssTTTTrrrraaaannnnssssllllaaaatttteeeedddd (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssRRRReeeeaaaaddddaaaabbbblllleeee (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssWWWWrrrriiiittttaaaabbbblllleeee (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssRRRReeeeaaaaddddWWWWrrrriiiitttteeee (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssIIIInnnnaaaaccccttttiiiivvvveeee (((()))) ccccoooonnnnsssstttt bbbboooooooollll iiiissssOOOOppppeeeennnn (((()))) ccccoooonnnnsssstttt iiiinnnntttt ssssttttaaaattttuuuussss (((()))) ccccoooonnnnsssstttt vvvvooooiiiidddd rrrreeeesssseeeettttSSSSttttaaaattttuuuussss (((()))) vvvviiiirrrrttttuuuuaaaallll bbbboooooooollll ooooppppeeeennnn (((( iiiinnnntttt mmmmooooddddeeee )))) vvvviiiirrrrttttuuuuaaaallll vvvvooooiiiidddd cccclllloooosssseeee (((()))) vvvviiiirrrrttttuuuuaaaallll vvvvooooiiiidddd fffflllluuuusssshhhh (((()))) vvvviiiirrrrttttuuuuaaaallll uuuuiiiinnnntttt ssssiiiizzzzeeee (((()))) ccccoooonnnnsssstttt vvvviiiirrrrttttuuuuaaaallll iiiinnnntttt aaaatttt (((()))) ccccoooonnnnsssstttt vvvviiiirrrrttttuuuuaaaallll bbbboooooooollll aaaatttt (((( iiiinnnntttt )))) vvvviiiirrrrttttuuuuaaaallll bbbboooooooollll aaaattttEEEEnnnndddd (((()))) ccccoooonnnnsssstttt bbbboooooooollll rrrreeeesssseeeetttt (((()))) vvvviiiirrrrttttuuuuaaaallll iiiinnnntttt rrrreeeeaaaaddddBBBBlllloooocccckkkk (((( cccchhhhaaaarrrr **** _d_a_t_a,,,, uuuuiiiinnnntttt lllleeeennnn )))) vvvviiiirrrrttttuuuuaaaallll iiiinnnntttt wwwwrrrriiiitttteeeeBBBBlllloooocccckkkk (((( ccccoooonnnnsssstttt cccchhhhaaaarrrr **** _d_a_t_a,,,, uuuuiiiinnnntttt lllleeeennnn )))) vvvviiiirrrrttttuuuuaaaallll iiiinnnntttt rrrreeeeaaaaddddLLLLiiiinnnneeee (((( cccchhhhaaaarrrr **** _d_a_t_a,,,, uuuuiiiinnnntttt mmmmaaaaxxxxlllleeeennnn )))) vvvviiiirrrrttttuuuuaaaallll iiiinnnntttt ggggeeeettttcccchhhh (((()))) vvvviiiirrrrttttuuuuaaaallll iiiinnnntttt ppppuuuuttttcccchhhh (((( iiiinnnntttt )))) vvvviiiirrrrttttuuuuaaaallll iiiinnnntttt uuuunnnnggggeeeettttcccchhhh (((( iiiinnnntttt )))) PPPPrrrrooootttteeeecccctttteeeedddd MMMMeeeemmmmbbbbeeeerrrrssss vvvvooooiiiidddd sssseeeettttFFFFllllaaaaggggssss (((( iiiinnnntttt ffff )))) vvvvooooiiiidddd sssseeeettttTTTTyyyyppppeeee (((( iiiinnnntttt )))) vvvvooooiiiidddd sssseeeettttMMMMooooddddeeee (((( iiiinnnntttt )))) vvvvooooiiiidddd sssseeeettttSSSSttttaaaatttteeee (((( iiiinnnntttt )))) vvvvooooiiiidddd sssseeeettttSSSSttttaaaattttuuuussss (((( iiiinnnntttt )))) DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN PPPPaaaaggggeeee 1111 ((((pppprrrriiiinnnntttteeeedddd 9999////22222222////99998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) TTTTrrrroooollllllll TTTTeeeecccchhhh AAAASSSS ((((9999 JJJJuuuullllyyyy 1111999999998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) The QIODevice class is the base class of I/O devices. An I/O device represents a medium that one can read bytes from and write bytes to. The QIODevice class itself is not capable of reading or writing any data; it has virtual functions for doing so. These functions are implemented by the subclasses QFile and QBuffer. There are two types of I/O devices; <em>direct access</em> and <em>sequential access </em> devices. Files can normally be accessed directly, except stdin etc., which must be processed sequentially. Buffers are always direct access devices. The access mode of an I/O device can be either _r_a_w or _b_u_f_f_e_r_e_d. QFile objects can be created using one of these. Raw access mode is more low level, while buffered access use smart buffering techniques. The raw access mode is best when I/O is block-operated using 4kB block size or greater. Buffered access works better when reading small portions of data at a time. An I/O device operation can be executed in either _s_y_n_c_h_r_o_n_o_u_s or _a_s_y_n_c_h_r_o_n_o_u_s mode. The I/O devices currently supported by Qt only execute synchronously. The QDataStream and QTextStream provide binary and text operations on QIODevice objects. QIODevice provides numerous pure virtual functions you need to implement when subclassing it. Here is a skeleton subclass: class YourDevice : public QIODevice { public: YourDevice(); ~YourDevice(); bool open( int mode ); void close(); void flush(); uint size() const; int at() const; // not a pure virtual function bool at( int ); // not a pure virtual function bool atEnd() const; // not a pure virtual function int readBlock( char *data, uint len ); int writeBlock( const char *data, uint len ); int readLine( char *data, uint maxlen ); int getch(); int putch( int ); int ungetch( int ); }; Page 2 (printed 9/22/98) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) TTTTrrrroooollllllll TTTTeeeecccchhhh AAAASSSS ((((9999 JJJJuuuullllyyyy 1111999999998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) The three non-pure virtual functions can be ignored if your device is sequential (e.g. a tape device). See also: QDataStream and QTextStream. MMMMEEEEMMMMBBBBEEEERRRR FFFFUUUUNNNNCCCCTTTTIIIIOOOONNNN DDDDOOOOCCCCUUUUMMMMEEEENNNNTTTTAAAATTTTIIIIOOOONNNN QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::QQQQIIIIOOOODDDDeeeevvvviiiicccceeee (((()))) Constructs an I/O device. QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::~~~~QQQQIIIIOOOODDDDeeeevvvviiiicccceeee (((()))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Destroys the I/O device. bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::aaaatttt (((( iiiinnnntttt ppppoooossss )))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Virtual function that sets the I/O device index to _p_o_s. See also: size(). Reimplemented in QBuffer and QFile. iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::aaaatttt (((()))) ccccoooonnnnsssstttt [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Virtual function that returns the current I/O device index. This index is the data read/write head of the I/O device. See also: size(). Reimplemented in QBuffer and QFile. bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::aaaattttEEEEnnnndddd (((()))) ccccoooonnnnsssstttt [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Virtual function that returns TRUE if the I/O device index is at the end of the input. Reimplemented in QFile. vvvvooooiiiidddd QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::cccclllloooosssseeee (((()))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Closes the I/O device. This virtual function must be reimplemented by all subclasses. See also: open(). Reimplemented in QBuffer and QFile. iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::ffffllllaaaaggggssss (((()))) ccccoooonnnnsssstttt Returns the current I/O device flags setting. Flags consists of mode flags and state flags. See also: mode() and state(). vvvvooooiiiidddd QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::fffflllluuuusssshhhh (((()))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] PPPPaaaaggggeeee 3333 ((((pppprrrriiiinnnntttteeeedddd 9999////22222222////99998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) TTTTrrrroooollllllll TTTTeeeecccchhhh AAAASSSS ((((9999 JJJJuuuullllyyyy 1111999999998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) Flushes an open I/O device. This virtual function must be reimplemented by all subclasses. Reimplemented in QBuffer and QFile. iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::ggggeeeettttcccchhhh (((()))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Reads a single byte/character from the I/O device. Returns the byte/character read, or -1 if the end of the I/O device has been reached. This virtual function must be reimplemented by all subclasses. See also: putch() and ungetch(). Reimplemented in QBuffer and QFile. bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssAAAAssssyyyynnnncccchhhhrrrroooonnnnoooouuuussss (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device is a asynchronous device, otherwise FALSE. This mode is currently not in use. See also: isSynchronous(). bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssBBBBuuuuffffffffeeeerrrreeeedddd (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device is a buffered (not raw) device, otherwise FALSE. See also: isRaw(). bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssCCCCoooommmmbbbbiiiinnnneeeeddddAAAAcccccccceeeessssssss (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device is a combined access (both direct and sequential) device, otherwise FALSE. This access method is currently not in use. bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssDDDDiiiirrrreeeeccccttttAAAAcccccccceeeessssssss (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device is a direct access (not sequential) device, otherwise FALSE. See also: isSequentialAccess(). bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssIIIInnnnaaaaccccttttiiiivvvveeee (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device state is 0, i.e. the device is not open. See also: isOpen(). Page 4 (printed 9/22/98) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) TTTTrrrroooollllllll TTTTeeeecccchhhh AAAASSSS ((((9999 JJJJuuuullllyyyy 1111999999998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssOOOOppppeeeennnn (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device state has been opened, otherwise FALSE. See also: isInactive(). bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssRRRRaaaawwww (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device is a raw (not buffered) device, otherwise FALSE. See also: isBuffered(). bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssRRRReeeeaaaaddddWWWWrrrriiiitttteeee (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device was opened using IO_ReadWrite mode. See also: isReadable() and isWritable(). bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssRRRReeeeaaaaddddaaaabbbblllleeee (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device was opened using IO_ReadOnly or IO_ReadWrite mode. See also: isWritable() and isReadWrite(). bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssSSSSeeeeqqqquuuueeeennnnttttiiiiaaaallllAAAAcccccccceeeessssssss (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device is a sequential access (not direct) device, otherwise FALSE. Operations involving size() and at(int) are not valid on sequential devices. See also: isDirectAccess(). bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssSSSSyyyynnnncccchhhhrrrroooonnnnoooouuuussss (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device is a synchronous device, otherwise FALSE. See also: isAsynchronous(). bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssTTTTrrrraaaannnnssssllllaaaatttteeeedddd (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device translates carriage-return and linefeed characters. A QFile is translated if it is opened with the IO_Translate mode flag. bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::iiiissssWWWWrrrriiiittttaaaabbbblllleeee (((()))) ccccoooonnnnsssstttt Returns TRUE if the I/O device was opened using IO_WriteOnly or IO_ReadWrite mode. See also: isReadable() and isReadWrite(). iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::mmmmooooddddeeee (((()))) ccccoooonnnnsssstttt Returns bits OR'ed together that specify the current Page 5 (printed 9/22/98) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) TTTTrrrroooollllllll TTTTeeeecccchhhh AAAASSSS ((((9999 JJJJuuuullllyyyy 1111999999998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) operation mode. These are the flags that were given to the open() function. The flags are: IO_ReadOnly, IO_WriteOnly, IO_ReadWrite, IO_Append, IO_Truncate and IO_Translate. bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::ooooppppeeeennnn (((( iiiinnnntttt mmmmooooddddeeee )))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Opens the I/O device using the specified _m_o_d_e. Returns TRUE if successful, or FALSE if the device could not be opened. The mode parameter _m must be a combination of the following flags. IO_Raw specified raw (unbuffered) file access. IO_ReadOnly opens a file in read-only mode. IO_WriteOnly opens a file in write-only mode. IO_ReadWrite opens a file in read/write mode. IO_Append sets the file index to the end of the file. IO_Truncate truncates the file. for text files under MS-DOS, Window, OS/2 and Macintosh. Cannot be combined with IO_Raw. IO_Translate enables carriage returns and linefeed translation This virtual function must be reimplemented by all subclasses. See also: close(). Reimplemented in QBuffer and QFile. iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::ppppuuuuttttcccchhhh (((( iiiinnnntttt cccchhhh )))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Writes the character _c_h to the I/O device. Returns _c_h, or -1 if some error occurred. This virtual function must be reimplemented by all subclasses. See also: getch() and ungetch(). Reimplemented in QBuffer and QFile. iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::rrrreeeeaaaaddddBBBBlllloooocccckkkk (((( cccchhhhaaaarrrr **** ddddaaaattttaaaa,,,, uuuuiiiinnnntttt lllleeeennnn )))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Reads at most _l_e_n bytes from the I/O device into _d_a_t_a and returns the number of bytes actually read. Page 6 (printed 9/22/98) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) TTTTrrrroooollllllll TTTTeeeecccchhhh AAAASSSS ((((9999 JJJJuuuullllyyyy 1111999999998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) This virtual function must be reimplemented by all subclasses. See also: writeBlock(). Reimplemented in QBuffer and QFile. iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::rrrreeeeaaaaddddLLLLiiiinnnneeee (((( cccchhhhaaaarrrr **** ddddaaaattttaaaa,,,, uuuuiiiinnnntttt mmmmaaaaxxxxlllleeeennnn )))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Reads a line of text, up to _m_a_x_l_e_n bytes including a terminating \0. If there is a newline at the end if the line, it is not stripped. Returns the number of bytes read, or -1 in case of error. This virtual function can be reimplemented much more efficiently by the most subclasses. See also: readBlock() and QTextStream::readLine(). Reimplemented in QBuffer and QFile. bbbboooooooollll QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::rrrreeeesssseeeetttt (((()))) Sets the device index to 0. See also: at(). vvvvooooiiiidddd QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::rrrreeeesssseeeettttSSSSttttaaaattttuuuussss (((()))) Sets the I/O device status to IO_Ok. See also: status(). vvvvooooiiiidddd QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::sssseeeettttFFFFllllaaaaggggssss (((( iiiinnnntttt ffff )))) [[[[pppprrrrooootttteeeecccctttteeeedddd]]]] For internal use only. vvvvooooiiiidddd QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::sssseeeettttMMMMooooddddeeee (((( iiiinnnntttt mmmm )))) [[[[pppprrrrooootttteeeecccctttteeeedddd]]]] For internal use only. vvvvooooiiiidddd QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::sssseeeettttSSSSttttaaaatttteeee (((( iiiinnnntttt ssss )))) [[[[pppprrrrooootttteeeecccctttteeeedddd]]]] For internal use only. vvvvooooiiiidddd QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::sssseeeettttSSSSttttaaaattttuuuussss (((( iiiinnnntttt ssss )))) [[[[pppprrrrooootttteeeecccctttteeeedddd]]]] For internal use only. vvvvooooiiiidddd QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::sssseeeettttTTTTyyyyppppeeee (((( iiiinnnntttt tttt )))) [[[[pppprrrrooootttteeeecccctttteeeedddd]]]] For internal use only. uuuuiiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::ssssiiiizzzzeeee (((()))) ccccoooonnnnsssstttt [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Virtual function that returns the size of the I/O device. See also: at(). Reimplemented in QBuffer and QFile. Page 7 (printed 9/22/98) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) TTTTrrrroooollllllll TTTTeeeecccchhhh AAAASSSS ((((9999 JJJJuuuullllyyyy 1111999999998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::ssssttttaaaatttteeee (((()))) ccccoooonnnnsssstttt Returns bits OR'ed together that specify the current state. The flags are: IO_Open. Subclasses may define more flags. iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::ssssttttaaaattttuuuussss (((()))) ccccoooonnnnsssstttt Returns the I/O device status. The I/O device status returns an error code. If open() returns FALSE or readBlock() or writeBlock() return -1, this function can be called to get the reason why the operation did not succeed. The status codes are: IO_Ok The operation was successful. IO_ReadError Could not read from the device. IO_WriteError Could not write to the device. IO_FatalError A fatal unrecoverable error occurred. IO_OpenError Could not open the device. IO_ConnectError Could not connect to the device. IO_AbortError The operation was unexpectedly aborted. IO_TimeOutError The operation timed out. See also: resetStatus(). iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::uuuunnnnggggeeeettttcccchhhh (((( iiiinnnntttt cccchhhh )))) [[[[vvvviiiirrrrttttuuuuaaaallll]]]] Puts the character _c_h back into the I/O device and decrements the index if it is not zero. This function is normally called to "undo" a getch() operation. Returns _c_h, or -1 if some error occurred. This virtual function must be reimplemented by all subclasses. See also: getch() and putch(). Reimplemented in QBuffer and QFile. iiiinnnntttt QQQQIIIIOOOODDDDeeeevvvviiiicccceeee::::::::wwwwrrrriiiitttteeeeBBBBlllloooocccckkkk (((( ccccoooonnnnsssstttt cccchhhhaaaarrrr **** ddddaaaattttaaaa,,,, uuuuiiiinnnntttt lllleeeennnn )))) PPPPaaaaggggeeee 8888 ((((pppprrrriiiinnnntttteeeedddd 9999////22222222////99998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) TTTTrrrroooollllllll TTTTeeeecccchhhh AAAASSSS ((((9999 JJJJuuuullllyyyy 1111999999998888)))) QQQQIIIIOOOODDDDeeeevvvviiiicccceeee((((3333qqqqtttt)))) [virtual] Writes _l_e_n bytes from _p to the I/O device and returns the number of bytes actually written. This virtual function must be reimplemented by all subclasses. See also: readBlock(). Reimplemented in QBuffer and QFile. SSSSEEEEEEEE AAAALLLLSSSSOOOO hhhhttttttttpppp::::////////wwwwwwwwwwww....ttttrrrroooollllllll....nnnnoooo////qqqqtttt////qqqqiiiiooooddddeeeevvvviiiicccceeee....hhhhttttmmmmllll CCCCOOOOPPPPYYYYRRRRIIIIGGGGHHHHTTTT Copyright 1992-1997 Troll Tech AS. See the LICENSE file included in the distribution for a complete license statement. AAAAUUUUTTTTHHHHOOOORRRR Generated automatically from the source code. Page 9 (printed 9/22/98)