How to load image using Media Tracker

[syarizma]

i have problem with my code.Plz somebody help me. the error of this code is cannot find constructor MediaTracker.

 import java.awt.*;
 import java.awt.image.*;
 import java.awt.Color;
 import java.awt.Image;
 import java.awt.Graphics;
 import javax.swing.*;
 import java.lang.Object;
 import java.util.*;
 import java.awt.BorderLayout;
 import java.awt.MediaTracker;
 import java.awt.Toolkit;
 
 


public class Binary_Image 

    {
    	public static void main(String[]arg)
    	{
    	
    
    	Image img;
    	int iw,ih;
    	int pixels[];
    	int hist[] = new int[256];
    	int max_hist = 0;
    	int cnt1=0,cnt=0,cnt2=0,h1,h2,h3,c=0;
       


	
        {
        	
        		
			Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        	int screenWidth = screenSize.width;
            int screenHeight = screenSize.height;
            
        	
			try


            	{
            		
           		MediaTracker tracker = new MediaTracker(this); 
		   		tracker.addImage(img,0); 
				try   {tracker.waitForID(0);} 
				catch (InterruptedException e){} 
			
			
            	img= Toolkit.getDefaultToolkit().getImage("jawi.gif");
  
				iw = img.getWidth(null);
            	ih = img.getHeight(null);
				
            		
            	pixels = new int[iw*ih];
            	PixelGrabber pg = new PixelGrabber(img,0,0,iw,ih,pixels,0,iw);
            	pg.grabPixels();
            		
            		
    		
            	} 
            	catch(InterruptedException e) {};
            
           	   
           	   for(int i=0;i<iw*ih;i++)
                {
                	int p = pixels[i];
                	int r = (p>>16) & 0xff;
                	int g = (p>>8) & 0xff;
                	int b = (p) & 0xff;
                	int k = (int)(.56*g + .33*r + .11 * b);
                	//pixels[i] = (0xff000000 | k<<16 | k<<8 |k);
                cnt++;
                			if(k<36)


                    			{
                    				cnt1++;
                    				pixels[i]=(255 << 24)|(0 << 16)|(0 << 8)|0;
                    			}
                    	
                    			else


                        			{
                        				cnt2++;
                        				pixels[i]=(255 << 24)|(255 << 16)|(255 << 8)|255;
                        			}
                        		}	
                        		
                        		System.out.println("Total no of pixels ="+cnt);
                        		System.out.println("Total no of black pixels ="+cnt1);
                        		System.out.println("Total no of white pixels ="+cnt2);
                        
                       
                    }

                    
                 }

 }

[Tolls]

The constructor for MediaTracker takes a java.awt.Component. Your class doesn't extend Component, so it's giving you the compilation error.

[syarizma]

Thanks Toll for your advise.I really appreciate. But i have another error when i extends component. The error is the non-static variable cannot references from a static content.

[Tolls]

Thanks Toll for your advise.I really appreciate. But i have another error when i extends component. The error is the non-static variable cannot references from a static content.

I assume the error has a bit more detail than that (like what non-static variable, and which line), but it's the error you get when you reference a non-static from a static method. Something like:

public class Blah {
    private String blah;  // non-static variable.

    public static void doSomething()  // static method
    {
        blah = "This won't work";  // This will give you a compilation error as blah is non-static.
                                           // Can only be accessed by an instance of Blah.
    }
}

[syarizma]

i'm try to do another way.. it can run properly but cannot invoke the image..i already put the jawi.gif in same folder of binary_image class.thanks.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.image.*;
import java.awt.Image.*;

public class Binary_Image extends JApplet{

    	Image img;
    	int iw,ih;
    	int pixels[];
    	int w,h;
    	int hist[] = new int[256];
    	int max_hist = 0;
    	int cnt1=0,cnt=0,cnt2=0,h1,h2,h3,c=0;
    	
    	public void init()


        {
       	   
        	try
            	{
            	
            		
            		img = Toolkit.getDefaultToolkit().getImage("jawi.gif");
            		
            		iw = img.getWidth(null);
            		ih = img.getHeight(null);
            		
            		pixels = new int[iw*ih];
            		PixelGrabber pg = new PixelGrabber(img,0,0,iw,ih,pixels,0,iw);
            		pg.grabPixels();
            	
 
            	} catch(InterruptedException e) {};
            
                for(int i=0;i<iw*ih;i++)


                {
                	int p = pixels[i];
                	int r = (p>>16) & 0xff;
                	int g = (p>>8) & 0xff;
                	int b = (p) & 0xff;
                	int k = (int)(.56*g + .33*r + .11 * b);
                	
                       cnt++;
                			if(k<36)


                    			{
                    			cnt1++;
                    			pixels[i]=(255 << 24)|(0 << 16)|(0 << 8)|0;
                    			}
                    	
                    			else
                        	       {
                        	cnt2++;
                        	pixels[i]=(255 << 24)|(255 << 16)|(255 << 8)|255;
                        	}
                        	}	
                        		
                        	System.out.println("Total no of pixels ="+cnt);
                                System.out.println("Total no of black pixels ="+cnt1);
                        	System.out.println("Total no of white pixels ="+cnt2);
                        
                   img = createImage(newMemoryImageSource(iw,ih,pixels,0,iw));
        }
    
    public static void main(String[]args) 
    	{
    		JFrame frame = new JFrame ();
    		
    		Binary_Image applet = new Binary_Image();
    		
    		frame.add(applet,BorderLayout.CENTER);
    		
    		applet.init();
    		
    		frame.setSize(500,300);
    		frame.setLocationRelativeTo(null);
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		frame.setVisible(true);
    }
   
}

[Tolls]

Can you edit that and stick code tags around it? Repaste the code between the tags, since you'ce already lost your formatting.

[syarizma]

ok..i already done it.

[Tolls]

You want to be using this.getClass().getResource(<filename>), which will give you a URL which will point to the file. Use the URL in the getImage() method. If the file is located with the Binary_Image.class then it should find it.

[syarizma]

thank a lot Tolls, i'm really appreciate it.