Applets

   Image m_image; 

   public void init() { 

       try { 

          InputStream in = getClass().getResourceAsStream("my.gif"); 

          if (in == null) { 

            System.err.println("Image not found.");

            return; 

          } 

          byte[] buffer = new byte[in.available()]; 

          in.read(buffer); 

          m_image = Toolkit.getDefaultToolkit().createImage(buffer); 

       } catch (java.io.IOException e) { 

            System.err.println("Unable to read image."); 

            e.printStackTrace(); 

       } 

   } 

   public void paint(Graphics g) { 

      if (m_image == null) 

      return; 

      Dimension d = getSize(); 

      g.drawImage(m_image, 0, 0, d.width, d.height, Color.white, this); 

   } 

}

 I have made an applet in VJ++ which I have to sign. Is there any tool to do it (both signing and

cabbing)..?

Answer: Signing and archive files are two of the biggest bothers in Java. Everyone

uses a different system. A good place to start is:

http://www.suitable.com/Doc_CodeSigning.shtml

One of the other bothers is that the unsigned window warning can t be removed by

signing an applet for Internet Explorer for Macintosh. And while I am on the

subject, the Windows Netscape 4.x system has a bunch of privilege calls:

http://developer.netscape.com/docs/manuals/signedobj/capsapi.html

and you need under most circumstances to make Microsoft specific calls too,

detailed in links from:

http://www.microsoft.com/java/security/

Going through all this will make you want to curse. Unfortunately it is

hard to pick a convincing scapegoat. It is true that Microsoft chose an

entirely nonstandard CAB system, but it produces archives that are about 40%

smaller than JAR files. Signing archive files is a perfect microcosm of the

"freedom to innovate" controversy. Microsoft has done a better job but taken

away predictability and uniformity. If the Java standards were not controlled

entirely by Sun, a Microsoft competitor, perhaps everyone would be using smaller

archive files by now.

Mickey Segal

Q: Why do I get message like  wrong magic number  when I am trying to run applet? What is a

magic number?

file:///F|/a_jsite/350_tips/applets.htm (3 of 9) [2001 07 08 11:24:47]