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Re: [Matplotlib-users] has anyone got matplotlib to work in a cgi script on Apache? - the 4 line script that will not run!
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From: Simon H. <sim...@jp...> - 2005-03-19 18:31:22
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John,
I have reduced the python script to 4 lines which no longer includes
matplotlib but it still does not work (see below). I have tried many
permutations - none work. If you can get this to work, under
Apache-windows. I would really appreciate knowing how. This capability
would be useful for displaying images from matplotlib.
#!d:/apps/Python23/python.exe
fp = open('tmp.png','rb')
print "Content-type: image/png\n"
print fp.read()
fp.close()
Tthe script generates is:
The image “http://shook-m2/cgi-bin/plot.py” cannot be displayed, because
it contains errors.
plot.py is the name of the script, tmp.png is a png in the cgi-bin
directory.
I am using:
Python 2.3 (Enthought version)
Apache 2.0.53
Windows XP Sp2
The script is in cgi-bin. Other python scripts work fine e.g. hello world.
Cheers, Simon
John Hunter wrote:
>>>>>>"Simon" == Simon Hook <sim...@jp...> writes:
>>>>>>
>>>>>>
>
> Simon> Hi, The code below when run from a file in the cgi-bin
> Simon> directory should generate a plot but it does not work:
>
>It would help to have more information. What do you mean "does not
>work"? Are there any errors displayed to the terminal or apache
>logs. I know people have used mpl with apache, but it can be a little
>tricky to get all the data paths set up properly.
>
>matplotlib uses a couple of environment variables to find it's data
>and store cache information. For example, if your fonts and
>.matplotlibrc are in a nonstandard place, you need to set the env var
>MATPLOTLIBDATA to point to them. Also, mpl tries to create a cache
>file .ttffont.cache in your HOME dir by default, and in an apache
>config HOME may not exist or may not be writable. If there is no
>HOME, matplotlib will fall back on the MATPLOTLIBDATA dir, so make
>sure env var is set, that it points to the directory that contains
>Vera.ttf and the other mpl fonts, and that it is writable by the user
>under which apache runs.
>
>If you get this to work, please write a HOWTO and submit it to the list.
>
>
> Simon> #!d:/apps/Python23/python
>
> Simon> import sys import matplotlib matplotlib.use('Agg') from
> Simon> pylab import *
>
> Simon> plot([1,2,3,4])
>
> Simon> #print "Content-type: text/html\n\n" #print "<html>Hello
> Simon> world!</html>"
>
> Simon> print "Content-type: image/png\n\n"
> Simon> print savefig(sys.stdout)
>
>This looks wrong. Doing
>
>print savefig(sys.stdout)
>
>will also print the return value of savefig, which is None I believe.
>I think you just want
>
>savefig(sys.stdout)
>
>But I can't vouch for the overall approach (setting the content type
>and then dumping in a binary stream of the png). It may be correct,
>but I haven't used it. Somehow I would expect the stream to be mime
>or base64 encoded in an ascii file.
>
> Simon> However, it does not work and I am really struggling to get
> Simon> matplotlib to generate a plot dynamically in a
> Simon> cgi-script. If anyone has done this successfully I would
> Simon> really appreciate some help or a simple example. I am using
> Simon> Windows XP and Apache 2.0.53.
>
>Hope this helps a little -- let us know if you have any more details
>on the problem you are experiencing or if you make any progress.
>
>JDH
>
>
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