[Twisted-Python] integrating a Qt interface with twisted, qt5, python 2.x

[Clayton Daley]

I believe your problem is this line:

> sys.exit(app.exec_())

Two issues:

   - It looks like app.exec_() blocks (e.g.
   http://stackoverflow.com/questions/22289423/how-to-avoid-qt-app-exec-blocking-main-thread
   )
   - When it unblocks, the program sys.exit() terminates (
   https://docs.python.org/2/library/sys.html#sys.exit)

Thus, your app never reaches any of the twisted code. If you're not
familiar with debugging tools that let you walk through the code, adding a
print line between each line of actual code would have made it obvious that
you never got past this line.

Clayton Daley

On Fri, Jun 17, 2016 at 11:26 AM, steven meier <commercials24 at yahoo.de>
wrote:

> hi,
>
>
> why does the code below print "testing..." but not "123" 5 seconds after
> the application started?
>
>
>
>
> import sys
> from PyQt5 import QtWidgets
> from untitled import Ui_MainWindow
> #from webchat import get_main_page
>
> class Main(QtWidgets.QMainWindow):
>
>     def __init__(self):
>         QtWidgets.QMainWindow.__init__(self)
>         self.ui = Ui_MainWindow()
>         self.ui.setupUi(self)
>         self.setupSignals()
>
>     def button_1_Clicked(self):
>         self.ui.textbox_2.setText(self.ui.textbox_1.text())
>
>     def setupSignals(self):
>         #self.ui.textbox_1.textChanged.connect(self.textbox_1_Changed)
>         self.ui.button_1.clicked.connect(self.button_1_Clicked)
>
>
>
>
> if __name__ == '__main__':
>     #app = QtWidgets.QApplication(sys.argv)
>
>     app = QtWidgets.QApplication(sys.argv) # your code to init QtCore
>     import qt5reactor
>     qt5reactor.install()
>
>     print "testing..."
>
>     #get_main_page()
>     window = Main()
>     window.show()
>     sys.exit(app.exec_())
>     def printMe(argument):
>         print argument
>
>     def lala():
>         reactor.callLater(5, printMe, '123')
>
>
>     lala()
>     reactor.run()
>
>
>
> _______________________________________________
> Twisted-Python mailing list
> Twisted-Python at twistedmatrix.com
> http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: </pipermail/twisted-python/attachments/20160619/2fc1a35d/attachment-0002.html>