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Offline juenvalj

Junior Newbie




Java games rock!


« Posted 2004-08-31 17:36:42 »

First I want to say hey to all  Smiley

I have been programming with java about a year now.
I also study computer science in university of Jyvaskyla in Finland and I'm starting my second year.

That's for me for now and to my problem which has been bothering me.

Here is working piece of code:

-------------------------------------------------------------------------
Image source = null;

URL ur l= this.getClass().getClassLoader().getResource(ref);
   if(url == null) return null;
   try {
     source = ImageIO.read(url);
   }
   catch (IOException ex) {
   }

---------------------------------------------------------------------

ImageIO.read(url);

---------------------------------------------------------------------

this returns BufferedImage type object...

but the piece of code what confuses me alot

------------------------------------------------------------------------

BufferedImage sourceImage = null;

try {
      URL url = this.getClass().getClassLoader().getResource(ref);

        if (url == null) {
              return null;
        }

         // use ImageIO to read the image in
         System.out.println(url); // this prints the rigth path
                     
        sourceImage = ImageIO.read(url);
    } catch (IOException e) {
         
    }
    System.out.println(sourceImage); // this prints null!! Huh

----------------------------------------------------------------------

and here I have used "correctly" ImageIO.read(url) -method..

Thanks Kev Glass for the great tutorial of SpaceInvaders Smiley

T: Juenvalj
Offline gregof

Junior Member




in code we trust


« Reply #1 - Posted 2004-08-31 20:06:06 »

Maybe you get an exception in your empty try/catch block?
Have you tried to see if you get a exception in that block? like:
1  
2  
3  
4  
 
} catch (IOException e) {
e.printStackTrace();
}

to see what is going on?

// Gregof
Offline juenvalj

Junior Newbie




Java games rock!


« Reply #2 - Posted 2004-09-01 05:10:55 »

yes I put it there but the line ImageIO.read doesn't make exception there.... it just prints null.. like it doesn't now how to read that file..
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Offline kevglass

JGO Kernel


Medals: 152
Projects: 23
Exp: 18 years


Coder, Trainee Pixel Artist, Game Reviewer


« Reply #3 - Posted 2004-09-01 05:37:15 »

Reading the javadoc:

http://java.sun.com/j2se/1.4.2/docs/api/javax/imageio/ImageIO.html#read(java.net.URL)

Quote

An InputStream is obtained from the URL, which is wrapped in an ImageInputStream. If no registered ImageReader claims to be able to read the resulting stream, null is returned.


So null we be returned if you're trying to read an image for a while an ImageReader doesn't exist. What type of image is it you're trying to load?

Kev

Offline juenvalj

Junior Newbie




Java games rock!


« Reply #4 - Posted 2004-09-01 05:42:33 »

I found the problem..

I used ms paint to make the images Embarrassed sorry never happens again I promise! So I did those images again with photoshop and it worked beatifully.

those images are .gif
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