[Mapserver-users] another perl mapscript problem

[Lowell Filak]

If you change your saveImage line so the image is saved to a system file and then:
system("cat $image_name");
do you get the same error?
If so then $query may not be setup correctly and is indeed not forwarding the content-type.
You mentioned you already tried sending content-type manually, do you mean:
print "Content-type: image/gif\n\n";
?
Lowell F.

The following message was sent by Dana Quinn <dana at nextbus.com> on Tue, 17 Dec 2002 10:11:19 -0800.

> 
> Hi - I'm having another perl mapscript problem, and I
> was hoping someone could help me find a clue.  Basically,
> I'm trying to get a pre-existing perl cgi we have working
> with the 3.6.3 version of mapserver, perl 5.8, and
> RedHat Linux 8.0.  I'm almost there, and I think probably
> some stupid problem is keeping me from finishing this.
> 
> Here's a code snippet - we've done all our image creation
> work, and we're ready to output it to the browser - (we
> are using CGI.pm, btw):
> 
>  >
> print $query->header('image/gif');
> 
> #
> $img->saveImage(undef,$mapscript::MS_GIF, $map->{transparent}, 
> $map->{interlace}, 0);
>  >
> 
> very simple, yeah?  If I change the 'saveImage' call to write
> to a file on the filesystem, it works perfectly, I get a
> saved gif that I'm able to view, and it works great.
> 
> If I use undef, like above, to output to the browser, I
> get a '500 Server Error', and get this in my server error
> logs:
> [Mon Dec 16 18:29:28 2002] [error] [client 64.164.28.194] malformed 
> header from script. Bad header=GIF87aX^B<F4>^A<E7>: 
> /usr/local/apache/cgi-bin/mapserv.pl
> 
> It kinda looks like the browser isn't seeing the Content-Type
> header...  but that's what the 'query->header' business is
> supposed to do.  So I've tried printing it by hand, no dice.
> There must be some stupid thing I'm missing - does anyone have
> any ideas what I'm doing wrong?
> 
> Dana
> 
> -- 
> 
> Dana Quinn, dana at nextbus.com
> NextBus Information Systems
> (510) 420-3117
> 
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