Arrow keys as keyboard Input

This is a discussion on Arrow keys as keyboard Input within the C++ Programming forums, part of the General Programming Boards category; Hey everyone i am trying to write an openGL program that uses the arrow keys to rotate an image. The ...

  1. #1
    Registered User
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    Jul 2005
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    Arrow keys as keyboard Input

    Hey everyone i am trying to write an openGL program that uses the arrow keys to rotate an image. The problem is i can't seem to find out how to use the keys. Is there specific numbers that corresponds to them? ASCII values ?

    I need to say :

    Code:
    if (key == arrow key) { 
    ....
    ....
    }


    thanks in advance,
    Brad

  2. #2
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    I know there's a chart somplace, but this simple program will tell you the ascii value of any key on the keyboard. This program will make special keys such as arrow keys and function keys negative so that a program can distinguish between special and normal keys. special keys have the same ascii value of normal keys, the difference is that specia keys are returned as two integers instead of one.

    Code:
    #include <iostream>
    #include <conio.h>
    using namespace std;
    
    
    int main() /* program main begins execution */
    {
    	int c= 0;
    	while( c != 27)
    	{
    		c = getche();
    		if(c == 0 || c == 224)
    			c = -getche();
    		cout << c << endl;
    		
    	}
    
       return 0;  /* indicates successful program execution */
    }

  3. #3
    Just Lurking Dave_Sinkula's Avatar
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    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  4. #4
    Devil's Advocate SlyMaelstrom's Avatar
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    I've posted this before, but this is a program that I wrote a while back that accepts input for all keys on the keyboard (except utility keys like CTRL and Lock Keys...). Thought, I must admit, the versions in the FAQs is signifcantly better.

    Another thing worth mentioning, if that if you're using OpenGL and you're looking to make a pretty advanced program, there are probably better ways for doing this. Windows.h has commands that can read key taps, solid key presses, keys being held down, etc... you may want to look into those.
    Last edited by SlyMaelstrom; 12-01-2005 at 08:45 PM.
    Sent from my iPadŽ

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