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Prevent Qt4 from stopping the interpreter #1905

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Merged
merged 5 commits into from
Apr 19, 2013
Merged

Prevent Qt4 from stopping the interpreter #1905

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5c222df
Prevented Qt4 from stopping the interpreter.
Apr 15, 2013
5a07c46
Merge branch 'master' of https://github.com/jschueller/matplotlib
openturns-appveyor Apr 15, 2013
9bed016
Just check DISPLAY env var
openturns-appveyor Apr 16, 2013
1cbce7d
Check for a X11 build of Qt
Apr 17, 2013
48e5bb1
Using a regex to check DISPLAY
Apr 17, 2013
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Just check DISPLAY env var
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@openturns-appveyor
openturns-appveyor committed Apr 16, 2013
commit 9bed01614814b2bc76d32110e1c6a3f9aa773971
14 changes: 6 additions & 8 deletions lib/matplotlib/backends/backend_qt4.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,14 +56,12 @@ def _create_qApp():
app = QtGui.QApplication.instance()
if app is None:

# try to launch a QApplication in a separate process
# otherwise it may stop the intepreter on failure (if no X server for example)
p = subprocess.Popen(sys.executable, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
p.stdin.write('from matplotlib.backends.qt4_compat import QtGui\napp = QtGui.QApplication([])\n')
p.stdin.close()
if p.wait() != 0:
raise RuntimeError( 'Qt4 failed to initialize ' + p.stderr.readline().rstrip() )

# check for DISPLAY env variable
if sys.platform.startswith('linux'):
display = os.environ.get('DISPLAY')
if (display is None) or (not ':' in display.strip()):
raise RuntimeError('Invalid DISPLAY variable')

qApp = QtGui.QApplication( [" "] )
QtCore.QObject.connect( qApp, QtCore.SIGNAL( "lastWindowClosed()" ),
qApp, QtCore.SLOT( "quit()" ) )
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