BUG: getch() Returns Incorrect Extended Key Codes

MORE INFORMATION

In the sample code below, the ALT key combined with any ASCII character returns the ASCII character code instead of the extended character code. The RIGHT CTRL key combined with any of the function or editing keys also fails with Visual C++ 1.0, returning the code for the function or editing key alone. The LEFT CTRL key combined with a function key or editing key returns the correct code. The set of affected editing keys are: END, PAGE UP, PAGE DOWN, HOME, RIGHT ARROW, and LEFT ARROW.

The table below demonstrates some of the actual versus expected values that result when the sample below is run with the input shown:

Input            Expected          Actual                VC 6.0

ALT+C            0 - 2eH           63H    (C)             63H
RT CTRL+F4       0 - 61H         0 - 3eH  (F4)           0 - 61H
RT CTRL+PAGE UP  0 - 84H         0 - 49H  (PAGEUP)      e0 - 86H
RT CTRL+END      0 - 75H         0 - 4fH  (END)          0 - 75H
				

Sample Code

   /* Compile options needed: none
   */ 

   void main(void)
   {
      int testChar;

      do {
            testChar = getch();
            printf("%x - ", testChar);
            testChar = getch();
            printf("%x \n", testChar);
      } while (testChar != 0x001B);  /* Repeat until ESC key*/ 
   }