Re^3: Broken image link when calling CGI from img tag

what techniques would I need to use so that the image is generated before the HTML is displayed?

Make sure that the code for the image generation is run before the code that displays the HTML (and that it's not run in the background).

Sorry, but without more knwoledge of the structure of your code it's impossible to give more concrete instructions.

Perl 6 - links to (nearly) everything that is Perl 6.

Comment on Re^3: Broken image link when calling CGI from img tag

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Re^4: Broken image link when calling CGI from img tag by lintunen (Novice) on Jul 26, 2010 at 08:12 UTC
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.	[reply] [d/l]
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
Re^8: Broken image link when calling CGI from img tag by lintunen (Novice) on Jul 28, 2010 at 09:59 UTC
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Re^7: Broken image link when calling CGI from img tag by Anonymous Monk on Jul 27, 2010 at 13:42 UTC
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]