mt object wouldnt load image

Newbie & Debugging Questions
#1

Hello,

Here is the code for MediaTracker object it doesnt loads image, the image is located in package DrawImage, also what is the difference between getDocumentBase() and getCodeBase()

   package DrawImage;
     
    import java.net.*;     
    import java.awt.*;
    
    public class LoadImage extends java.applet.Applet 
    {
        Image uc  ;
        URL base;
        MediaTracker mt;       
    
    	public void init()
    	{
       		mt = new MediaTracker(this);
        	try{
            		base = getDocumentBase();
            		}catch(Exception e){}
        
        	uc = getImage(base, "src//DrawImage//java.gif");
	        mt.addImage(uc,1);
        
        	try{
	        mt.waitForAll();
        	}catch(InterruptedException e){}    
	}
    
    	public void paint(Graphics g)
	{   
        	g.drawImage(uc, 45  , 45, Color.yellow, this);
    	}        
   }
#2

MediaTracker is a very outdated way of loading images. I strongly recommend using ImageIO.read() instead!

#3

thanks, here is imageio but this also doesnt loads the image

package DrawImage;

import java.applet.Applet;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.net.URL;
import javax.imageio.*;
 
public class LoadImage extends Applet {
 
     private BufferedImage img;
 
     public void init() {
         try {
             URL url = new URL(getCodeBase(), "src//DrawImage//java.GIF");
             img = ImageIO.read(url);
         } catch (IOException e) {
         }
     }
 
     public void paint(Graphics g) {
       g.drawImage(img, 50, 50, null);
     }
}
#4

You should never ever silently swallow an exception like that. You’re probably getting an error telling you what the problem is.

#5 
package DrawImage;

import java.applet.Applet;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.net.URL;
import javax.imageio.*;
 
public class LoadWindows extends Applet {
 
     private BufferedImage img;
 
     public void init() {
         try {
             URL url = new URL(getCodeBase(), "src//DrawImage//java.GIF");
             img = ImageIO.read(url);
         } catch (IOException e) {
             System.out.println(e);
         }
     }
 
     public void paint(Graphics g) {
       g.drawImage(img, 50, 50, null);
     }
}

here is the code with exception and it says:“javax.imageio.IIOException: Can’t get input stream from URL!”

#6

Not sure why you think you have to use “//” – did you see “\” and attempt to swap the slashes to make it cross-platform? Simply use “/”

That will be the first step to solve your problem. This thread will help you with the next steps:

#7

thanks works now with the toolkit

package DrawImage;   

import java.applet.Applet;
import java.awt.*;

public class Load extends Applet
{
   private Image img;   

   public void init()
   {
      img = null;
      
   }
   public void loadImage()
   {
      try
      { 
         img = Toolkit.getDefaultToolkit().getImage("src//DrawImage//java.gif");;
      }
      catch(Exception e) { }
   }
   public void paint(Graphics g)
   {
      if (img == null)
         loadImage();
      g.drawImage(img, 0, 0, this);
   }
}