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Thread: Incorrect Key Input

  1. #1
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    Default Incorrect Key Input

    Hi the program I made plays sound files when the user input a numeric key. How do I get the program to identify when any key other than ‘1’, ‘2’, ‘3’, ‘4’ as incorrect keys and displays an error message when the user presses a wrong key. Ive attached the sound files. Thanks

    import java.awt.*;
    import java.applet.*
     
    public class PlaySoundAndMusic extends Applet{
       Image Buffer;
       Graphics gBuffer;
     
       AudioClip clip;
       AudioClip clip2;
       AudioClip clip3;
       AudioClip clip4;
     
       public void init(){
     
         Buffer=createImage(size().width,size().height);
          gBuffer=Buffer.getGraphics();
     
          try
          {
               clip=getAudioClip(getCodeBase(),"gong.wav");
               clip2=getAudioClip(getCodeBase(),"shoot.wav");
               clip3=getAudioClip(getCodeBase(), "bsg.mid");
               clip4=getAudioClip(getCodeBase(), "drwhotheme.mid");
     
     
     
     
    }
          catch (Exception e){}
       }
     
       public boolean keyDown(Event e, int key){
     
          if(key=='1')
               clip.play();
          if(key=='2')
               clip2.play();
          if(key=='3')
          		clip3.play();
          if(key=='4')
          		clip4.play();
     
     
          repaint();
     
          return true;
       }
     
     
       public void draw()
       {
          gBuffer.setColor(Color.WHITE);
          gBuffer.fillRect(0,0,size().width,size().height);
     
          gBuffer.setFont(new Font("Arial",Font.PLAIN,14));
          gBuffer.setColor(Color.RED);
          //if we want to use "" inside a string, we have to mask it with \!
          gBuffer.drawString ("Press numeric key ‘1’ to play gong.wav,",50,30);
          gBuffer.drawString ("Press numeric key '2' to play shoot.wav,",45,50);
          gBuffer.drawString ("Press numberic key '3' to play bsg.mid," , 40,70);
          gBuffer.drawString ("Press numberic key '4' to play drwhotheme.mid,", 35,90);
     
     
       }
     
       public void update(Graphics g)
       {
          paint(g);
       }
     
       public void paint(Graphics g)
       {
          draw();
          g.drawImage (Buffer,0,0, this);
       }
    }
    Attached Files Attached Files


  2. #2
    Member OutputStream's Avatar
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    Default Re: Incorrect Key Input

    if(key=='1')

    You are comparing an int to a char. Remove the single-quotes and compare key to an int instead.

    Also what error message are you getting?

    EDIT: keyDown is a deprecated method. I strongly suggest you take a look at KeyListener.
    Last edited by OutputStream; June 28th, 2011 at 10:09 AM.

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Incorrect Key Input

    To see what is passed to the keyDown() method add a println to print it out. The results might not be what you expect.

  4. #4
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    Default Re: Incorrect Key Input

    Quote Originally Posted by OutputStream View Post
    if(key=='1')

    You are comparing an int to a char. Remove the single-quotes and compare key to an int instead.

    Also what error message are you getting?

    EDIT: keyDown is a deprecated method. I strongly suggest you take a look at KeyListener.
    I kind of new to writing programs. How do you use keylistener? I need to get finished with this program today

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: Incorrect Key Input

    Go to this site: The Really Big Index
    and search for Key Listener

  6. The Following User Says Thank You to Norm For This Useful Post:

    risen375 (June 28th, 2011)

  7. #6
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    Default Re: Incorrect Key Input

    Thank for the information. . How do I get the program to identify when any key other than ‘1’, ‘2’, ‘3’, ‘4’ as incorrect keys and displays an error message when the user presses a wrong key.

  8. #7
    Super Moderator Norm's Avatar
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    Default Re: Incorrect Key Input

    Depends on how you are receiving the key presses.
    One way is with the if/else if/else structure you almost coded earlier. The trailing else clause would be executed if none of the preceding if tests were true.
    If the key value has the int value in the range: 1-4 then test if it's less than 1 or greater than 4.
    Or you could use a switch statement with the case statements for 1-4 all falling into one block of code and the default case being for the error.

  9. #8
    Member OutputStream's Avatar
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    Default Re: Incorrect Key Input

    Did you follow Norm's link and did you have a look at the tutorial? It explains a lot on how to use a KeyListener.

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