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how to save a image via cgi

umeda
umeda asked
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Last Modified: 2008-03-06
Howdy, i am making an applet which can save image via CGI. I found a
GIFEnder at http://www.cs.brown.edu/people/amd/ and using it. core code is
following:
   GIFEncoder encoder;
       ByteArrayOutputStream byteOut =
         new ByteArrayOutputStream(16384);// make 16384byte
   try{
          try{
            encoder = new GIFEncoder(Img);//Img is an image in applet
            encoder.Write(byteOut);
            System.out.println("Encoder bytes:
"+byteOut.size());//i got some size!
            } catch(AWTException e){} //need for GIFEncoder
        }
        catch (IOException e)
        {}
     try {
            System.out.println("Connect output");
            URL url = new URL(getCodeBase(), "test.cgi");
            System.out.println("get url");
            URLConnection urlConnection = url.openConnection();
            urlConnection.setDoOutput(true);
            PrintStream oout = new
            PrintStream(urlConnection.getOutputStream());
            System.out.println(oout);//returns object
            oout.print(byteOut);
            oout.flush();
            oout.close();
            }
            catch (IOException e){}
           ...........
<test.cgi>
#! /usr/local/bin/perl
$file ='data.gif';
print "Content-type: image/gif\n";
print "\n";

if (defined($ENV{'CONTENT_LENGTH'})) {
  open(F,">$file");
  $len = $ENV{'CONTENT_LENGTH'};

  for ($i = 0; $i < $len; $i++) {
    $c = getc;
    print F $c;
  }
  close(F);
}

there is not any error messages. i plug in "System.out.println" and check
how the program behave.. as far as i know there is no problem but there
would not any out put in data.gif. I am not really clear whether i sould
use PRINTSTREAM to pass cgi file. i would be appreciate for any help or
some pointers in web-pages... thanks for advance.
 

Comment
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Commented:
I have done exactly the same.  However I never used PrintStream, I used the other one.

However, in your CGI script, you are writing too much to the file. Do not write any HTML header information to the file, and then everything should be tickety boo.

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