Microsoft KB Archive/40359

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Turning the SCROLL LOCK Key On


6.00 6.00a 6.00ax 7.00 | 1.00 1.50 MS-DOS | WINDOWS kbprg ---------------------------------------------------------------------- The information in this article applies to: - Microsoft C for MS-DOS, versions 6.0, 6.0a, and 6.0ax - Microsoft C/C++ for MS-DOS, version 7.0 - Microsoft Visual C++ for Windows, versions 1.0 and 1.5 ---------------------------------------------------------------------- SUMMARY ======= The following code illustrates how to turn the SCROLL LOCK key on in your program. Note: This code is only for use with MS-DOS. Running it with OS/2 will cause a protection violation. Use the OS/2 FAPI function KbdSetStatus() to set the status of shift flags when writing programs that will run with OS/2 or be bound to run with both MS-DOS and OS/2. This technique will cause a general protection violation if attempted in a Windows or QuickWin application. The Windows SDK has functions GetKeyboardState() and SetKeyboardState() for checking and setting the lock keys on the keyboard. MORE INFORMATION ================ Sample Code ----------- /* Compile options needed: none */ #include main() { /* Get the address of the keyboard status byte */ char far *kbdstat = (char far *) 0x00000417; char scrollmask = 0x10; /* OR *kbdstat with scrollmask to set bit 4 in the keyboard status byte to 1 */ *kbdstat = *kbdstat | scrollmask; } Additional information on keyboard status can be found in the Peter Norton "Programmer's Guide to the IBM PC and PS/2." Additional reference words: kbinf 6.00 6.00a 6.00ax 7.00 1.00 1.50 KBCategory: kbprg KBSubcategory: CLngIss

Keywords : kb16bitonly
Issue type :
Technology : kbVCsearch kbAudDeveloper kbPTProdChange kbvc150 kbvc100 kbCCompSearch kbZNotKeyword3 kbCComp600DOS kbCComp600aDOS kbCComp600axDOS kbCVC700DOS

Last Reviewed: May 6, 2001
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