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Using keyboard presses to trigger internal speaker sound

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Using keyboard presses to trigger internal speaker sound

 
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  #1
Nov 11th, 2008
Hi everyone, basically i'm writing a simple program in c++ to trigger a beep from the internal speaker much like a musical keyboard except i'm having trouble with capturing key press

how would i be able to trap a key press then initiate a beep, i have tried using kbhit() in a If statement but not able to detect the keyboard press, as i dont know the keyboard button matrix addresses here is my code, tell me what you think

C++ Syntax (Toggle Plain Text) 
  1. /*Author:Joseph Ioannou
  2. Description: Simple program which detects input from keyboard and makes sounds :) */
  3. #include <stdio.h>
  4. #include <conio.h>
  5. #include <windows.h>   // WinApi header file
  6.  
  7. //Sleep(500);    // 500 ms delay
  8. //Beep(523,500);  // 523 hertz (C5) for 500 milliseconds
  9. int keychk[9] = {1, 2, 3, 4, 5, 6, 7, 8, 9}; // simple key check int array
  10.  
  11. int main()
  12. {
  13.   puts("");
  14. // 523 hertz (C5) for 500 milliseconds
  15.   Beep(500,1000);
  16.   Beep(500,1000);
  17.   Beep(500,1000);
  18.   Beep(400,800);
  19.   Beep(500,500);
  20.   Beep(600,500);
  21.   Beep(400,800);
  22.   Beep(500,500);
  23.   Beep(600,500);
  24.   puts("Waiting for key press to begin");
  25.   getchar(); // key wait
  26.  
  27.     printf("Please press a key");
  28.     if(kbhit()!='a')
  29.     {
  30.     printf("a key is pressed"); 
  31.     } 
  32.     else return 0;
  33. }


the program starts by a simple text statement then plays a small tune like the first nine notes from star wars as an introduction

the keychk is just an array i was going to use to compare the key press to the number pad as i thought it would be useful

the kbhit if statement is just an example i left in to show you what i ment, hope this helps you help me (the printf will be replaced with a beep)

thanks in advance, Joe
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Re: Using keyboard presses to trigger internal speaker sound

 
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  #2
Nov 11th, 2008
why do you need kbhit? kbhit works more like a detector if key is pressed, it doesn't wait for keypress.
Simply use getch?
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Re: Using keyboard presses to trigger internal speaker sound

 
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  #3
Nov 13th, 2008
ya using the getch is the good idea to tap the keyboard..
but i guess its not pretty good idea to use the getch() directly
since it waits for the keystroke.. always and pause the screen...
you can use it like this..
for eg..

C++ Syntax (Toggle Plain Text) 
  1. if(kbhit())
  2.   {
  3.    switch(getch()) //monitor key stroke
  4.     {
  5.      case 80: //Down arrow
  6.       Focus(CFP+1);	break;
  7.  
  8.      case 72: //Up arrow
  9.       Focus(CFP-1);	break;
  10.  
  11.      case 13: //Enter
  12.       RESPOND=CFP;      break;
  13.  
  14.      case 27: //Esc
  15.       RESPOND=27;
  16.     }
  17.   }

I have always wonder how to tap the Function key (F1, F2, F3... F12)... Somebody know then help us out..
Last edited by cscgal; Nov 13th, 2008 at 4:24 pm. Reason: Fixed code tags
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Re: Using keyboard presses to trigger internal speaker sound

 
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  #4
Nov 13th, 2008
ya using the getch is the good idea to tap the keyboard..
but i guess its not pretty good idea to use the getch() directly
since it waits for the keystroke.. always and pause the screen...
you can use it like this..
for eg..

C++ Syntax (Toggle Plain Text) 
  1. if(kbhit())
  2.   {
  3.    switch(getch()) //monitor key stroke
  4.     {
  5.      case 80: //Down arrow
  6.       Focus(CFP+1);	break;
  7.  
  8.      case 72: //Up arrow
  9.       Focus(CFP-1);	break;
  10.  
  11.      case 13: //Enter
  12.       RESPOND=CFP;      break;
  13.  
  14.      case 27: //Esc
  15.       RESPOND=27;
  16.     }
  17.   }

I have always wonder how to tap the Function key (F1, F2, F3... F12)... Somebody know then help us out..
Last edited by cscgal; Nov 13th, 2008 at 4:23 pm. Reason: Fixed code tags
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Re: Using keyboard presses to trigger internal speaker sound

 
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  #5
Nov 13th, 2008
If you're going to use windows.h's Beep() instead of the old non-ANSI _beep(), you might as well use Window's GetKeyState(), or GetKeyboardState().
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