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How to block python running using PythonQt #187
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There are multiple ways of doing this of course, What solution you prefer depends on how you design and use Qt and object-orientation in general. However, a simply dirty way it so put a wait before
CloseProjectwhere you either wait for theQProcess::finishedsignal emitted from somewhere (so you would need to have it available) or perhaps just do a wait loop like below. The way I usually block until something is finished is this way:from PythonQt import QtCore GenerateMesh() self._waitLoop = QtCore.QEventLoop() # QtCore.QTimer.singleShot(5000, self._waitLoop.quit) # Stop waiting after 5 seconds returnCode = waitLoop.exec_() self._waitLoop = None if returnCode == 0: CloseProject(True) else: CloseProject(False)and then call
self._waitLoop.exit(0)either connected toQProcess::finishedor from where you handle it. You might of course also want to put a single shot timer on it so make sure you program doesn't hang forever in caseQProcess::finishedis never signaled - it's in the commented out line above.- locked and limited conversation to collaborators
on Feb 2, 2024
There is a part of python script as follows, these functions call C++ functions.
GenerateMesh start external QProcess to do real task, then return immediatly. It's async. There is another function reciving QProcess::finished signal to do some other work.
CloseProject closes the program.
This design has a fatal problem. GenerateMesh is async, CloseProject is invoked, at this point, the child process is not finished.
A possible solution is move all python operation to subthread, and make GeneratorMesh synchronous. but other function do a lot of UI operation.
Is there a proper way to block or pause python running?