[Mapserver-users] Sending image to stdout under Apache

[Lowell Filak]

Hmmm...
I thought I replied back concerning that.?
Just do a:
print "Content-type: image/png\n\n";
system("cat junk.png");
and that will send the image to stdout/the browser.
HTH
Lowell F.

The following message was sent by Eric Bridger <eric at gomoos.org> on 05 Mar 2003 08:59:12 +0000.

> 
> 
> The list archives show that this came up last Dec.
> (http://mapserver.gis.umn.edu/data2/wilma/mapserver-users/0212/msg00265.html) and while a work around was suggested there was no solution to the problem given, so I was wondering if anyone else had run into this problem. 
> 
> I'm having a problem using Perl mapscript $img->saveImage(undef, ...),
> to send an image, PNG and/or JPEG, to the standard output under Apache. 
> Running in /cgi-bin I have the following script: 
> 
> my $map = new mapscript::mapObj($ms_dir . "/test.map"); 
> 
> my $ref_img = $map->drawReferenceMap(); 
> 
> # This works fine: 
> #$ref_img->saveImage("junk.png", $mapscript::MS_PNG,  
> $map->{transparent}, $map->{interlace}, 0); 
> 
> print "HTTP/1.0 200 OK\n"; 
> print "Content-type: image/png\r\n\r\n"; 
> binmode STDOUT; 
> 
> # this produces no output on Apache's STDOUT 
> $ref_img->saveImage("", $mapscript::MS_PNG, $map->{transparent},
> $map->{interlace}, 0); 
> 
> $ref_img->free(); 
> exit; 
> 
> 
> >From the command line this script works as expected.  But when run under
> Apache/mod_perl  it's as if the C msSaveImage() stdout stream is
> pointing somewhere other than the Apache stdout (i.e. the client
> browser). 
> 
> The work around of course is to save a disk file and then print it, but
> the whole point of this is to avoid the temp. disk files.  I've noticed
> a significant increase in performance when using mapserv as an image
> engine rather then using temp disk files. 
> 
> Thanks. 
> Eric 
> 
> 
> Setup: 
> 
> Apache/1.3.26 (Unix) 
> Mapserv 3.6.4 
> mod_perl 1.22 
> 
> 
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