PyQt GUI doesn't appear at Raspberry Pi startup



  • Hey Guys,
    I am trying to get this running for days.
    I created a simple PyQt-Script With two buttons and a label.
    When I start it on my Raspberry Pi via consolse it works fine.
    I edited the rc.local file on my Pi to make it running ont startup.
    (btw I also tried all the other possibilities like .desktop-file or editing autostart file in lxsession)
    When I reboot the Pi (autologin on desktop) the GUI doesnt appear.
    But the python-script was executed (I know it, because it's also writing the time in a file)
    And when I try the same with a simple py-script using kivy it works perfectly.

    Do you have any suggestions what I do wrong?

    Thanks in advance!

    btw. I am using a Raspberry Pi 2 B with Raspbian Jessie on an original Raspberry Pi 7" Touchscreen.
    here is my python script:

    #!/usr/bin/python
    # always seem to need this
    import sys
    from time import *
     
    # This gets the Qt stuff
    import PyQt5
    from PyQt5.QtWidgets import *
     
    # This is our window from QtCreator
    import mainwindow_auto
     
    # create class for our Raspberry Pi GUI
    class MainWindow(QMainWindow, mainwindow_auto.Ui_MainWindow):
     # access variables inside of the UI's file
    	def __init__(self):
    		super(self.__class__, self).__init__()
    		self.setupUi(self) # gets defined in the UI file
     
    # I feel better having one of these
    def main():
     # a new app instance
    	lt = localtime()
    	zeitnow = strftime("Es ist: %H:%M:%S", lt)
    	print (zeitnow)
    	file = open("/home/pi/loggerfile.txt","w")
    	file.write(zeitnow)
    	file.close
    	app = QApplication(sys.argv)
    	form = MainWindow()
    	form.show()
     # without this, the script exits immediately.
    	sys.exit(app.exec_())
     
    # python bit to figure how who started This
    if __name__ == "__main__":
    	main()
    

  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Do you already have the Xorg server running before starting your application ?



  • Hey,

    thanks for you reply.
    Yes I have the x server running.
    I am using auto-login at desktop.


  • Moderators

    @PyQtN00b You could try to redirect standard output and error output to a file when start your app:

    PATH_TO_APP 2>&1 1 > PATH_TO_A_FILE
    

    Then check the content of that file.



  • Hi,

    Suggestion: check the order of execution, and dependencies in execution script. Maybe you are trying to execute your app too soon, before drivers/configurations of display is set (To be honest, i don't know how does Linux handles loading of display drivers)

    regards



  • Another thing related to being executed too soon -- I would try adding a delay to the beginning of the script, say, like 5 seconds, to make sure the environment is ready.


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