PyQt4 embedding in C++ application - maemo.org

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gri	2010-05-23 , 10:26
Posts: 190 \| Thanked: 129 times \| Joined on Mar 2010 @ Bavaria, Germany	#1

Hello,

I'm testing the python embedding with PyQt4 but unfortunately the loading in scratchbox fails with a strange message. The same code runs fine on Windows XP.

Code:

Traceback (most recent call last):
  File "/home/gri/web2sms-0.1.1/dist/providers/provider_test.py", line 22, in <module>
    from PyQt4 import QtCore, QtGui
ImportError: /usr/lib/python2.5/site-packages/PyQt4/QtCore.so: undefined symbol: PyProperty_Type

Google only finds one debian bugreport related to this. But there's no answer

So maybe someone here knows why this error happens.

C++ source of python initialization
Source of python script

Quote & Reply |

gri	2010-05-24 , 22:05
Posts: 190 \| Thanked: 129 times \| Joined on Mar 2010 @ Bavaria, Germany	#2

Small update on this.

I found out funny things about the following lines of code:

Code:

Py_Initialize();

PyRun_SimpleString("from PyQt4 import QtCore, QtGui");
if ( PyErr_Occurred() )
  PyErr_Print();  

Py_Finalize();

Run these lines in the main program: works.
Run these lines in a shared library which the main program loads at startup: works.
Run these lines in a shared library which is loaded using QLibraryLoader at runtime: the error described in the first post

So what now? Is there anything magic I don't know when using shared library runtime loading?

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:-)	2010-05-24 , 23:14
Posts: 6 \| Thanked: 3 times \| Joined on May 2010	#3

Originally Posted by gri

So what now? Is there anything magic I don't know when using shared library runtime loading?

Try playing with the load hints if you're using QLibrary to load Python, especially ExportExternalSymbolsHint:

http://doc.qt.nokia.com/4.6/qlibrary.html#LoadHint-enum