PRODUCT  :  Borland C++                           NUMBER  :  1162
  VERSION  :  3.1
       OS  :  DOS
     DATE  :  November 11, 1993                        PAGE  :  1/2

    TITLE  :  Detecting the F11 and F12 keys.





       TITLE :   Catching Keys F11 and F12


       If you need to catch keystrokes F11 or F12, you can use
  bioskey() to do so.  However, you will need to use new parameters
  values 0x10 and 0x11 instead of 0x00 and 0x01.  The following
  program demonstrates the technique.  F11 should return 0x8500
  while F12 returns 0x8600.



       #include  <stdio.h>
       #include  <bios.h>
       #include  <ctype.h>
       #define   RIGHT     0x01
       #define   LEFT      0x02
       #define   CTRL      0x04
       #define   ALT       0x08


       int main(void)
       {
            int key, modifiers;

            /* function 0x11 returns 0 until a key is pressed */
            while (bioskey(0x11) == 0);

            /* function 0x10 returns the key that is waiting */
            key = bioskey(0x10);

            /* use function 2 to determine
               if shift keys were used */
            modifiers = bioskey(2);

            if (modifiers)
            {
                 printf("[");
                 if (modifiers & RIGHT) printf("RIGHT");
                 if (modifiers & LEFT)  printf("LEFT");
                 if (modifiers & CTRL)  printf("CTRL");
                 if (modifiers & ALT)   printf("ALT");
                 printf("]");













  PRODUCT  :  Borland C++                           NUMBER  :  1162
  VERSION  :  3.1
       OS  :  DOS
     DATE  :  November 11, 1993                        PAGE  :  2/2

    TITLE  :  Detecting the F11 and F12 keys.




            }

            /* print out the character read */
            if (isalnum(key & 0xFF))
                 printf("'%c'\n", key);
            else
                 printf("%#02x\n", key);
            return 0;
       }




  NOTE:     Functions 0x10 and 0x11 are only supported by ATs and
            PS/2s with Enhanced Keyboards.  Hence, proper
            detections should be performed prior to using the
            functions.  To detect Enhanced Keyboard support.  One
            can check the BIOS DATA AREA ( 40:96 ) or use a
            combination of INT 16,5 and INT 16,10.  See a BIOS
            Technical Reference manual for more details.



  DISCLAIMER: You have the right to use this technical information
  subject to the terms of the No-Nonsense License Statement that
  you received with the Borland product to which this information
  pertains.