Re^4: Broken image link when calling CGI from img tag

I was hoping there would be some generic guidelines on how to handle dynamic image generation and img tags but anyway, in short after the image is generated by an external process the script that generates the image contains the following code:

if (-e $IMAGEFILE) {
    print $query->redirect($IMAGEFILE);
    exit;
}
[download]

And as mentioned previously, the perl script is called via an img tag.

Comment on Re^4: Broken image link when calling CGI from img tag Download Code

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Re^5: Broken image link when calling CGI from img tag by moritz (Cardinal) on Jul 26, 2010 at 09:45 UTC
The general mechanism is to wait for the external program, and only then print the redirect. Perl 6 - links to (nearly) everything that is Perl 6.	[reply]
Re^6: Broken image link when calling CGI from img tag by lintunen (Novice) on Jul 27, 2010 at 13:38 UTC
So will putting the correct logic in the Perl CGI script to wait will stop a broken link being shown in the img tag of the HTML document that calls the Perl script in the first place? As I posted previously, existence for the file is checked before calling the redirect.	[reply]
Re^7: Broken image link when calling CGI from img tag by moritz (Cardinal) on Jul 27, 2010 at 14:18 UTC
As I posted previously, existence for the file is checked before calling the redirect. But you haven't shown what happens if the file doesn't exist. You haven't told us if there are any mechanisms on your system that might delete files. All in all you told us little about your system (and most importantly, have shown us little actualy code), and haven't headed the advice to look into the access and error logs. Asking general questions to solve a specific problem seems rather inefficient to me. Perl 6 - links to (nearly) everything that is Perl 6.	[reply]
Re^8: Broken image link when calling CGI from img tag by lintunen (Novice) on Jul 28, 2010 at 09:59 UTC
Re^9: Broken image link when calling CGI from img tag by Corion (Patriarch) on Jul 28, 2010 at 11:46 UTC
Some notes below your chosen depth have not been shown here
Re^9: Broken image link when calling CGI from img tag by moritz (Cardinal) on Jul 28, 2010 at 11:39 UTC
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Re^9: Broken image link when calling CGI from img tag by Anonymous Monk on Jul 28, 2010 at 12:05 UTC
Re^7: Broken image link when calling CGI from img tag by Anonymous Monk on Jul 27, 2010 at 13:42 UTC
Don't assume that one has anything to do with the other, and do check logs/direct link/raw http	[reply]
Re^5: Broken image link when calling CGI from img tag by Anonymous Monk on Jul 26, 2010 at 08:17 UTC
I was hoping there would be some generic guidelines on how to handle dynamic image generation and img tags but anyway Check the logs, check the raw http request (or check link directly without img tag). <P. Either you're not outputting the image correctly (correct headers, binmode ...), or permissions on the file are wrong, or the webserver is configured to not serve images from that directory ....	[reply]