ImageMagick with System (or exec or shel_exec)

bubblenut

Hi,
I've been trying to execute an ImageMagick convert command through php but it keeps just doing half the image and leaving the bottom half grey. However, if I su to nobody and run exactly the same command from the prompt it works fine. The command is

/usr/X11R6/bin/convert -size 180x180! -quality 95 /home/bubble/tmp/tmpfile.jpg -resize 180x180! /home/bubble/images/stopover/ECTL012_10073big.jpg

This morning I found a little more information. If I su to nobody, then run /usr/bin/php -q test1.php which is the file in question it gives me a
convert: Corrupt JPEG data: premature end of data segment (/home/httpd/maintenance/elec/tmp/tmpfile.jpg).
error. I have no idea why this is not being shown when I view this remotely through the browser, but hey. I've had a look but can't seem to find anything (not really a php question this) but does anyone know of a way to make ImageMagick ignore non-fatal errors like this and just carry on to the next data segment?
Thanks in advance
Bubble

yelvington

I can't help with the "how do I get it to ignore the error" problem, but I can explain why the error message is not returned to PHP.

First of all, exec() is clearly documented as "it does not output anything. It simply returns the last line from the result of the command. If you need to execute a command and have all the data from the command passed directly back without any interference, use the passthru() function."

Even if you use passthru(), however, you probably would not see the error message. In Unix systems, error messages are written to a separate file handle (stderr) from normal output (stdout).
See the note from kpierre at the bottom of this page:
http://us4.php.net/manual/en/function.passthru.php

bubblenut

Thanks, I got the error with 2>tmp and then open the tmp file, didn't know you could output it to stdout1. Found out what the problem was in the end. I was reading a binary file with fgets() Doh!
Thanks
Bubble