ID Number: Q30370
5.00 5.10 6.00 6.00a 6.00ax 7.00 | 5.10 6.00 6.00a
MS-DOS | OS/2
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 <bios.h>
#include <stdio.h>
#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("F11 key pushed\n");
if((nextval & MASK) == 0x8600) /* Buffer code = 8600 for F12 */
printf("F12 key pushed\n");
}
else
printf("not an extended key\n");
}
}
Additional reference words: 5.00 5.10 6.00 6.00a 6.00ax 7.00