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POTrouble using PIL with Google Appengine SDK
 

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  1. POTrouble using PIL with Google Appengine SDK
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    <p>I have a Windows Server 2008 R2 (64bits) machine on which I wanted to develop a google AppEngine app.</p> <p>So I installed Python 2.5.4 from python.org (because the Google SDK said I needed 2.5 and 2.5.6 didn't have any MSI's) Then I installed PIL from <a href="http://www.pythonware.com/products/pil/" rel="nofollow noreferrer">http://www.pythonware.com/products/pil/</a> I used version 1.1.7 for python 2.5 I used the 32-bits versions of both of these.</p> <p>Then I installed the AppEngine SDK.</p> <p>Hello-World worked fine, but I wanted to manipulate an image, which didn't work because I get this stacktrace and a HTTP 500 response:</p> <pre><code>2010-02-18 11:50:27 Running command: "['C:\\Python25\\pythonw.exe', 'C:\\Program Files (x86)\\Google\\google_appengine\\dev_appserver.py', '--admin_console_server=', '--port=8080', 'd:\\imgsvc']" WARNING 2010-02-18 10:50:29,260 datastore_file_stub.py:623] Could not read datastore data from c:\users\admini~1\appdata\local\temp\dev_appserver.datastore INFO 2010-02-18 10:50:29,627 dev_appserver_main.py:399] Running application imgsvc on port 8080: http://localhost:8080 ERROR 2010-02-18 10:50:40,058 dev_appserver.py:3217] Exception encountered handling request Traceback (most recent call last): File "C:\Program Files (x86)\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 3180, in _HandleRequest self._Dispatch(dispatcher, self.rfile, outfile, env_dict) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 3123, in _Dispatch base_env_dict=env_dict) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 515, in Dispatch base_env_dict=base_env_dict) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 2382, in Dispatch self._module_dict) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 2292, in ExecuteCGI reset_modules = exec_script(handler_path, cgi_path, hook) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 2188, in ExecuteOrImportScript exec module_code in script_module.__dict__ File "d:\imgsvc\imgsvc.py", line 7, in &lt;module&gt; outputimage = images.resize(inputimage.content, 32, 32) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\images\__init__.py", line 625, in resize return image.execute_transforms(output_encoding=output_encoding) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\images\__init__.py", line 513, in execute_transforms response) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\apiproxy_stub_map.py", line 78, in MakeSyncCall return apiproxy.MakeSyncCall(service, call, request, response) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\apiproxy_stub_map.py", line 278, in MakeSyncCall rpc.CheckSuccess() File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\apiproxy_rpc.py", line 149, in _WaitImpl self.request, self.response) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\apiproxy_stub.py", line 80, in MakeSyncCall method(request, response) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\images\images_stub.py", line 171, in _Dynamic_Transform response_value = self._EncodeImage(new_image, request.output()) File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\images\images_stub.py", line 193, in _EncodeImage image.save(image_string, image_encoding) File "C:\Python25\lib\site-packages\PIL\Image.py", line 1439, in save save_handler(self, fp, filename) File "C:\Python25\lib\site-packages\PIL\PngImagePlugin.py", line 564, in _save import ICCProfile SystemError: Parent module 'PIL' not loaded INFO 2010-02-18 10:50:40,081 dev_appserver.py:3246] "GET / HTTP/1.1" 500 - </code></pre> <p>The python script I was trying to run:</p> <pre><code>from google.appengine.api import urlfetch from google.appengine.api import images url = "http://www.brokenwire.net/bw/images/113.png" inputimage = urlfetch.fetch(url) if inputimage.status_code == 200: outputimage = images.resize(inputimage.content, 32, 32) self.response.headers['Content-Type'] = "image/png" self.response.out.write(outputimage) </code></pre> <p>Anybody any idea what is going wrong here?</p> <p>I also tried this standalone python script, which works fine:</p> <pre><code>import Image im = Image.open('filename.png') im2 = im.resize((100,100), Image.ANTIALIAS) im2.show() </code></pre> <p>It seems that it makes a difference which image I use:</p> <pre><code>url = "http://www.r-stone.net/blogs/ishikawa/uploaded_images/google_appengine-779483.png" </code></pre> <p>Gives the stacktrace of the question, but</p> <pre><code>url = "http://www.brokenwire.net/bw/images/113.png" </code></pre> <p>works without a problem.</p>
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    1. COI wonder if it works on production GAE.
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    2. COGood call, I'll try that. For now I'm fine with one working and another not working (locally), just very curious to know why...
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    3. COCheck that GAE development server is running on the same Python version where PIL is installed.
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