enviroment variables do not work when cgi saved as image/png

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hi, I am having trouble getting the enviroment ($ENV) varaibles to appear when I save the cgi with image/png format. Here is a snippet so you know what I mean:

print "Content-type: image/png\n\n";
open(RAW, "output.png");
binmode(RAW);
print RAW $im->png();
while ( read( RAW, $buffer, 16_384 ) ) {
    print $buffer;
}
close(RAW);
[download]

Before In the cgi script I create an image with GD and I use a ENV variable. Why doesnt this work Thanks, Mello a continutation of this http://perlmonks.com/index.pl?node_id=414908 beacuse no-one was replying

Comment on enviroment variables do not work when cgi saved as image/png Download Code

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Re: enviroment variables do not work when cgi saved as image/png by r34d0nl1 (Pilgrim) on Dec 17, 2004 at 20:26 UTC
Could you try to send us the complete code? I don't see where you are trying to use the ENV variables but it's very strange once that the ENV variables should became acessible during the entire execution of your script. Thanks	[reply]
Re: enviroment variables do not work when cgi saved as image/png by steves (Curate) on Dec 18, 2004 at 14:55 UTC
If this works from the command line, but not as a CGI, and the issue is missing environment variables, I would first check your web server. You have to take special measures (i.e., configuration) to have a web server set environment variables that a CGI sees. The simple place to start is to write a CGI script -- not even necessarily Perl -- that shows what your environment is when the CGI is invoked. Apache comes with this printenv CGI script (written in Perl of course!): `#!/usr/local/bin/perl ## ## printenv -- demo CGI program which just prints its environment ## print "Content-type: text/plain\n\n"; foreach $var (sort(keys(%ENV))) { $val = $ENV{$var}; $val =~ s\|\n\|\\n\|g; $val =~ s\|"\|\\"\|g; print "${var}=\"${val}\"\n"; }` [download]	[reply] [d/l]
Re: enviroment variables do not work when cgi saved as image/png by sasikumar (Monk) on Dec 20, 2004 at 07:02 UTC
Hi I hope the problem with the environment variables is because you would require to specify them in the httpd.conf (sorry i assume you would use the apache httpd server). just refer http://httpd.apache.org/docs/mod/mod_env.html beacuse no-one was replying Please post every question or doubt as a seperate node. Thanks Sasi Kumar	[reply]