I'm getting problems with WSGI 3.3 and Qt4 applications. It seems that
items of a QGraphicsScene cannot call the childItem() method. The following
test script works well when called from the command line, but never
finishes when called as WSGI application. I have noticed that this problem
is present when using WSGI v3.3 but not with older (2.8) versions.
childItems() method seem to hang and the application becomes unresponsive.
WSGI is set to run as a daemon with 1 processes and 1 thread
Any clue about what could be happening? Could it be a WSGI problem?
environment (working): python 2.6.4, apache 2.2.14, mod-wsgi 2.8, qt 4.6.2,
python-qt 4.7.2
environment (problem): python 2.6.6, apache 2.2.16, mod-wsgi 3.3, qt 4.6.3,
python-qt 4.7.3
from PyQt4.QtGui import *
import sys
# Show print msgs in apache logs
sys.stdout = sys.stderr
import os
# Allows apache to use DISPLAY. The command "xhost +" could be temporarily
required to start Qt applications from the web server
os.environ["DISPLAY"]=":0.0"
QApp = None
def application(environ, start_response):
global QApp
status = '200 OK'
output = 'Hello World!'
response_headers = [('Content-type', 'text/plain'),
('Content-Length', str(len(output)))]
start_response(status, response_headers)
qt_test()
return [output]
def qt_test():
QApp = QApplication(["TEST"])
scene = QGraphicsScene()
obj = QGraphicsRectItem()
scene.addItem(obj)
print "EMPTY LIST", obj.childItems()
obj2 = QGraphicsRectItem()
obj2.setParentItem(obj)
print "CHILDREN", obj.childItems()
print "FINISH"
return
if __name__ == "__main__":
qt_test()
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