progress bar issues

[shooogun]

Hi all,

I'm trying to update a progress bar, but whenever I run setValue it crashes my program. The error I get looks like this:

X Error: BadRequest (invalid request code or no such operation) 1
Extension: 183 (Uknown extension)
Minor opcode: 0 (Unknown request)
Resource id: 0x36020ba

It doesn't happen on each iteration, only some initially, but then toward the end of the iteration, each setValue command fails, and then the program crashes.

X Error: BadRequest (invalid request code or no such operation) 1
Major opcode: 0 ()
Resource id: 0x36020ba

my code looks like this

x=0
while x < len(fileList):
     # do stuff
     self.progressBar.setValue(x)
     x+=1

x=0
while x < len(fileList):
     # do stuff
     self.progressBar.setValue(x)
     x+=1

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any advise?

[jpn]

Does this happen in the main GUI thread?

[shooogun]

I think so.

I create an instance of a class which inherits QThread, in the initializer of the mainwindow, and store that instance in a variable in the mainwindow class, so the pseudo code would be

class myThread(QThread):
    def __init__(self):
        QThread.__init__(self)
 
    def run(self):
        x=0
        while x != progBarMax:
            progressBar.setValue(x)
            x+=1
 
class myInterface(QMainWindow, UIModule.My_UI):
    def __init__(self, parent=None):
        super(myInterface, self).__init__(parent)
        self.setupUI(self)
        self.interface = myThread()
 
    @pyqtSignature("")
    def on_button_clicked(self):
        self.interface.start()

class myThread(QThread):
    def __init__(self):
        QThread.__init__(self)

    def run(self):
        x=0
        while x != progBarMax:
            progressBar.setValue(x)
            x+=1

class myInterface(QMainWindow, UIModule.My_UI):
    def __init__(self, parent=None):
        super(myInterface, self).__init__(parent)
        self.setupUI(self)
        self.interface = myThread()

    @pyqtSignature("")
    def on_button_clicked(self):
        self.interface.start()

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[wysota]

In that case you are accessing a GUI object (progressBar) from within a worker thread which is forbidden. You have to do that from within the GUI thread.

[shooogun]

Ok. Thanks for the help. It's working now