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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! - HOWTO
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From: Simon H. <sim...@jp...> - 2005-03-20 02:20:43
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John,
Below is a version of the script that works. The problem is windows does
not put out binary. The example in the matplotlib documentation should
be updated to point out this machine compatibility issue unless someone
knows a better way.
#!d:/apps/Python23/python
import os, sys, msvcrt
from pylab import *
plot([1,2,3,4])
print "Content-type: image/png\n"
msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
savefig(sys.stdout)
Best wishes, Simon
Simon Hook wrote:
> 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
>>
>>
--
+++++++++++++++++++++++++++++++++++++++++
Simon J. Hook, MSc, PhD
Jet Propulsion Laboratory
MS 183-501
Pasadena, CA 91109
Office: 818-354-0974
Fax: 818-354-0966
Email: sim...@jp...
http://asterweb.jpl.nasa.gov
http://masterweb.jpl.nasa.gov
http://laketahoe.jpl.nasa.gov
+++++++++++++++++++++++++++++++++++++++++
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