--- Paul Burkett <[EMAIL PROTECTED]> wrote:
> Ok, this is odd, I got it so it wont redirect the webpage, but now it won't
> change the camera. When I restore it to the original code it changes the
> camera but redirects the page to "500 Internet Server Error." Shouldn't
> STDIN work in CGI scripts?
The 500 error is an error that your Web server is returning. It means that the output
of the
script is not as expected. First, check your error logs. These should give you an
idea of what
the actual problem is (if the program is not compiling, for example). It could also
be some sort
of buffering issue where output is being sent to STDOUT before the headers have been
sent. This
is a particularly insidious problem if you are calling external programs with "system"
or
backticks. Read http://perl.plover.com/FAQs/Buffering.html for more information.
If it's a buffering issue with a CGI script, include this at the top of the script:
$|++;
That should disable buffering for STDOUT.
As for STDIN, that depends upon what you are doing there. Remember that POST data
from a form is
sent to and read from STDIN. When you first instantiate a CGI object (or make certain
function
calls when using the function-oriented interface), then CGI.pm might read the contents
of STDIN,
as this is where it often expects to find form data. If you have an external program
sending data
to STDIN, you may be having problems with CGI.pm clobbering the data (to be fair, this
will happen
with virtually any CGI parsing code).
If an external program is writing to STDIN, can you pipe the data somewhere else and
read it from
there?
Another tactic: if you are using CGI.pm but are not using the form-handling code,
then tell
CGI.pm to take its data from another source. One way is to do this:
my $q = CGI->new("");
Then, you can use $q at will without clobbering STDIN. This is often used for
debugging when you
want consistent query parameters:
my $q = CGI->new('color=red&name=Ovid');
Cheers,
Curtis Poe
=====
Senior Programmer
Onsite! Technology (http://www.onsitetech.com/)
"Ovid" on http://www.perlmonks.org/
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