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[C] Function keys

Discussion in 'Programming' started by Alhazred, Aug 7, 2004.

  1. #1
    
    char * UserInput(int max) {
      BOOL EndInput = TRUE;
      unsigned int Count;
      int Count2 = 0, Count3 = 0, cursore = 0;
      char AllowedCh[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', '\0'};
      char AllowedNum[] = {'1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '\0'};
      char *Buff;
      char Current = ' ';
      char provvisorio[2];
      char *definitivo;
    
      Buff = (char *) malloc((max + 1));
      definitivo = (char *) malloc((max + 1));
      Buff[0] = '\0';
      definitivo[0] = '\0';
    
      while(EndInput)
      {
          provvisorio[Count3] = getch();
          definitivo = strupr(provvisorio);
          definitivo[Count3 + 1] = '\0';
          Current = definitivo[Count3];
          switch(Current)
          {
             case 13: EndInput = FALSE;
                      Buff[Count2] = '\0';
                      break;
    
             case 8: Buff[Count2] = '\0';
                     if(cursore > 0)
                     {
                       printf("\b \b");
                       Count2--;
                       Buff[Count2] = '\0';
                       cursore--;
                     }
                     break;
    
             /*function keys exclusion*/
             case(0+65): break;
             case(0+66): break;
             case(0+67): break;
             case(0+68): break;
             case(0+69): break;
             case(0+70): break;
             case(0+71): break;
             case(0+72): break;
             case(0+73): break;
             case(0+74): break;
             /****************/
    
             default: if(max == 1)
                      {
                          for(Count = 0; Count < strlen(AllowedCh); Count++)
                          {
                             if(Current == AllowedCh[Count] && (Count2 < max))
                             {
                                 printf("%c", Current);
                                 Buff[Count2] = Current;
                                 Count2++;
                                 cursore++;
                              }
                          }
                          break;
                      }
                      else
                      {
                          for(Count = 0; Count < strlen(AllowedNum); Count++)
                          {
                             if(Current == AllowedNum[Count] && (Count2 < max))
                             {
                                 printf("%c", Current);
                                 Buff[Count2] = Current;
                                 Count2++;
                                 cursore++;
                             }
                          }
                          break;
                      }
          }
      }
      return Buff;
    } //End UserInput
    
    Code (markup):
    I have a problem with this code, if I press F7, F8, F9, F10, pagup, home introduce valid character for input.
    Well have you some suggestion about how to recognize if a function key or a char key is pressed and accept only the chars?
    How to do in my code?
    SEMrush
    Example, if I press F7 it will input A. I don't want this!
     
    Alhazred, Aug 7, 2004 IP
    SEMrush
  2. msaad

    msaad Peon

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    #2
    Hmm.. If i remember correctly, when getch() is used, function keys send two codes instead of one. First a 0 is returned from getch() (which is an indication this is an extended key), and then a special code is returned (which causes the A to be printed).

    So, all you need to do is make a check that if getch() returns a zero, then call it again to get the actual code of the key.
     
    msaad, Aug 26, 2004 IP