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From: Simon H. <sim...@jp...> - 2005-03-11 08:50:42
|
Hi,
The code below when run from a file in the cgi-bin directory should
generate a plot but it does not work:
#!d:/apps/Python23/python
import sys
import matplotlib
matplotlib.use('Agg')
from pylab import *
plot([1,2,3,4])
#print "Content-type: text/html\n\n"
#print "<html>Hello world!</html>"
print "Content-type: image/png\n\n"
print savefig(sys.stdout)
However, it does not work and I am really struggling to get matplotlib
to generate a plot dynamically in a cgi-script. If anyone has done this
successfully I would really appreciate some help or a simple example. I
am using Windows XP and Apache 2.0.53.
Many thanks,
Simon
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From: John H. <jdh...@ac...> - 2005-03-19 12:56:20
|
>>>>> "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
|
|
From: Simon H. <sim...@jp...> - 2005-03-19 18:31:22
|
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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From: Simon H. <sim...@jp...> - 2005-03-20 02:20:43
|
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
+++++++++++++++++++++++++++++++++++++++++
|
|
From: Peter G. <pgr...@ge...> - 2005-03-19 21:06:28
|
I do it all the time, but instead of writing to a stream directly, I
write to file, and embed the image in the html. This works for me,
because (1) I need that html around to let users setup options, and (2)
the images are available at a later date - something that has been
plotted once can be viewed multiple times.
You basically save your plot to a file and then include something like:
<img src="/tmp/image.2005-03-19_10-50-20.38431390.png">
in your html.
Unless you serve thousands of requests, the few ms waisted
writing/reading to/from a file should be negligible.
Finally, you might want to look into the error log file for apache, and
see what goes on behind the scenes. I still run 0.65 (modified) and
remember had to setup proper permissions on a cache file before thigs
worked.
Another thing, maybe not the case here, but worth remembering that it is
crucial to have the 'Content-type' line be the first data written. I've
had issues in the past where importing some libraries would write
something else to the stream, and often would be get some criptic errror.
Cheers,
--
Peter Groszkowski Gemini Observatory
Tel: +1 808 9742509 670 N. A'ohoku Place
Fax: +1 808 9359235 Hilo, Hawai'i 96720, USA
Simon Hook wrote:
> Hi,
>
> The code below when run from a file in the cgi-bin directory should
> generate a plot but it does not work:
>
> #!d:/apps/Python23/python
>
> import sys
> import matplotlib
> matplotlib.use('Agg')
> from pylab import *
>
> plot([1,2,3,4])
>
> #print "Content-type: text/html\n\n"
> #print "<html>Hello world!</html>"
>
> print "Content-type: image/png\n\n"
> print savefig(sys.stdout)
>
> However, it does not work and I am really struggling to get matplotlib
> to generate a plot dynamically in a cgi-script. If anyone has done
> this successfully I would really appreciate some help or a simple
> example. I am using Windows XP and Apache 2.0.53.
>
> Many thanks,
>
> Simon
>
>
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