86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/*
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* $Id$
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*/
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/*
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* File......: PRTSCR.C
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* Author....: Ted Means
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* CIS ID....: 73067,3332
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*
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* This is an original work by Ted Means and is placed in the
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* public domain.
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*
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* Modification history:
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* ---------------------
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*
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* Rev 1.3 01 Jan 1995 03:01:00 TED
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* Added dual-mode compatibility.
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*
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* Rev 1.2 15 Aug 1991 23:08:24 GLENN
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* Forest Belt proofread/edited/cleaned up doc
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*
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* Rev 1.1 14 Jun 1991 19:53:54 GLENN
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* Minor edit to file header
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*
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* Rev 1.0 01 Apr 1991 01:02:58 GLENN
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* Nanforum Toolkit
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*
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*
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*/
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/* $DOC$
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* $FUNCNAME$
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* FT_PRTSCR()
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* $CATEGORY$
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* Keyboard/Mouse
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* $ONELINER$
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* Enable or disable the Print Screen key
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* $SYNTAX$
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* FT_PRTSCR( [ <lSetStat> ] ) -> lCurStat
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* $ARGUMENTS$
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* <lSetStat> set to .T. will enable the Print Screen key,
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* .F. will disable it. If omitted, leaves status as is.
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* $RETURNS$
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* The current state: .T. if enabled, .F. if disabled.
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* $DESCRIPTION$
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* This function is valuable if you have a need to disable the
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* printscreen key. It works by fooling the BIOS into thinking that
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* a printscreen is already in progress. The BIOS will then refuse
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* to invoke the printscreen handler.
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* $EXAMPLES$
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* FT_PRTSCR( .F. ) && Disable the printscreen key
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* FT_PRTSCR( .T. ) && Enable the printscreen key
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* MemVar := FT_PRTSCR() && Get the current status
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* $SEEALSO$
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* FT_CAPLOCK() FT_CTRL() FT_NUMLOCK() FT_SHIFT() FT_ALT()
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* $END$
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*/
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#include <hbapi.h>
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#define pbyte *( ( char * ) 0x00400100 )
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HB_FUNC(FT_PRTSCR)
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{
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#if defined(HB_OS_DOS)
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{
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if ( hb_pcount() && ISLOG( 1 ) )
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{
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if ( hb_parl( 1 ) )
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pbyte = 0;
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else
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pbyte = 1;
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}
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if ( pbyte == 1)
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hb_retl( FALSE );
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else
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hb_retl( TRUE );
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return;
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}
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#endif
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}
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