Question

For brevity’s sake: I’m trying to implement this with wxPython, but I’m struggling to fit that code into a script based on wxPython.

My simple PyQt test code works fine. Here it is:

from PyQt4 import QtGui
from threading import Thread
import time
import sys
import comtypes.client as cc
import comtypes.gen.TaskbarLib as tbl

TBPF_NOPROGRESS = 0
TBPF_INDETERMINATE = 0x1
TBPF_NORMAL = 0x2
TBPF_ERROR = 0x4
TBPF_PAUSED = 0x8

cc.GetModule("taskbar.tlb")
taskbar = cc.CreateObject("{56FDF344-FD6D-11d0-958A-006097C9A090}", interface=tbl.ITaskbarList3)

class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)
        self.setWindowTitle("Test")

        self.progress_bar = QtGui.QProgressBar(self)
        self.setCentralWidget(self.progress_bar)
        self.progress_bar.setRange(0, 100)

        self.progress = 0

        self.show()

        thread = Thread(target=self.counter)
        thread.setDaemon(True)
        thread.start()

    def counter(self):
        while True:
            self.progress += 1
            if self.progress > 100:
                self.progress = 0

            time.sleep(.2)

            self.progress_bar.setValue(self.progress)

            taskbar.HrInit()
            hWnd = self.winId()
            taskbar.SetProgressState(hWnd, TBPF_ERROR)        
            taskbar.SetProgressValue(hWnd, self.progress, 100)

app = QtGui.QApplication(sys.argv)
ui = MainWindow()
sys.exit(app.exec_())

But, when I try to execute the wxPython counterpart, the taskbar doesn’t work as expected. Here’s the wxPython code:

import wx
import time
import comtypes.client as cc
import comtypes.gen.TaskbarLib as tbl
from threading import Thread

TBPF_NOPROGRESS = 0
TBPF_INDETERMINATE = 0x1
TBPF_NORMAL = 0x2
TBPF_ERROR = 0x4
TBPF_PAUSED = 0x8

cc.GetModule("taskbar.tlb")
taskbar = cc.CreateObject("{56FDF344-FD6D-11d0-958A-006097C9A090}", interface=tbl.ITaskbarList3)

class MainWindow(wx.Frame):
    def __init__(self, parent, ID, title):
        wx.Frame.__init__(self, parent, ID, title)

        self.panel = wx.Panel(self)
        self.gauge = wx.Gauge(self.panel)
        self.gauge.SetValue(0)

        self.progress = 0

        self.Show()

        thread = Thread(target=self.counter)
        thread.setDaemon(True)
        thread.start()

    def counter(self):
        while True:
            self.progress += 1
            if self.progress > 100:
                self.progress = 0

            time.sleep(.2)

            self.gauge.SetValue(self.progress)

            taskbar.HrInit()
            hWnd = self.GetHandle()

            taskbar.SetProgressState(hWnd, TBPF_ERROR)
            taskbar.SetProgressValue(hWnd, self.progress, 100)

app = wx.PySimpleApp()
frame = MainWindow(None, wx.ID_ANY, "Test")
app.SetTopWindow(frame)
app.MainLoop()

In particular I think the issue is due to the wxWindow window handle (hWnd) method, that differ from its Qt equivalent, the former returning an integer and the latter a “sip.voidptr object”.

The problem is that I already wrote the whole code (1200+ lines) with wxPython, thus i can’t re-write it to use Qt (not to talk about the different licenses).

What do you think about it? Should I give up?

Thanks a lot in advance 🙂

EDIT

Thanks to Robert O’Connor, now it works. However, I still can’t get why GetHandle returns an integer while winId returns an object. In the .idl file the argument hwnd is declared as long in all the function definitions. Maybe this is a simple question too 😉 Any Ideas?

Answer 1

On the following line:

hWnd = self.panel.GetId()

You want to use GetHandle() instead of GetId().

Edit: This was originally posted as a comment, but I suppose it would be more appropriate for me to repost as an answer.

Regarding the edit to your question: If it now works I guess there isn’t a problem anymore 😉 Okay, seriously though..

Ints and Longs are unified in Python and if I had to guess comtypes might be doing some coercion in the background. I don’t know if it’s necessary to worry about such details when dealing with comtypes in general, but it doesn’t seem to matter much in this case.

Now I have no experience with PyQT, but in Python you can define special methods on objects such as __int__ and __long__ to emulate, well, Ints and Longs. If I had to guess, the object you’re getting in PyQT defines one of those methods.