Microsoft KB Archive/30370

{|
 * width="100%"|

Reading F11 and F12 Keys on Extended Keyboard

 * }

Q30370

5.10 6.00 6.00a 6.00ax 7.00 | 5.10 6.00 6.00a | 1.00 1.50 MS-DOS | OS/2 | WINDOWS kbprg kbcode -- The information in this article applies to: - The C Run-time (CRT), included with: - Microsoft C for MS-DOS, versions 5.1, 6.0, 6.0a, and 6.0ax - Microsoft C for OS/2, versions 5.1, 6.0, and 6.0a - Microsoft C/C++ for MS-DOS, version 7.0 - Microsoft Visual C++ for Windows, versions 1.0 and 1.5 -- SUMMARY ======= The following program allows you to read the F11 and F12 keys on an extended keyboard. The key to this process is to call _bios_keybrd with the service argument 0x10. This allows an extended keyboard read. This program will sit in an infinite loop until F11 or F12 is pressed. Note that the C run-time library functions getch or getche will not be able to read in the extended function keys even after the change above has been made. MORE INFORMATION ================ Sample Code --- /* Compile options needed: none */ #include #include #define _EXTKEYREAD 0x10 #define MASK 0xFF00 #define ZMASK 0x00FF main { unsigned value, nextval; while(1) { value = _bios_keybrd(_EXTKEYREAD); nextval = value; if ((value & ZMASK) == 0) /* Check low order byte for zero.*/ /* If zero, then we have extended key.*/ { if((nextval & MASK) == 0x8500) /* Buffer code = 8500h for F11 */ printf(&quot;F11 key pushed\n&quot;); if((nextval & MASK) == 0x8600) /* Buffer code = 8600h for F12 */ printf(&quot;F12 key pushed\n&quot;); } else printf(&quot;not an extended key\n&quot;); } } Additional reference words: kbinf 1.00 1.50 5.10 6.00 6.00a 6.00ax 7.00 KBCategory: kbprg kbcode KBSubcategory: CRTIss

Keywords : kb16bitonly

Issue type :

Technology : kbVCsearch kbAudDeveloper kbCRT