jdm

from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import SIGNAL

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

class MyMainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)
        self.setWindowTitle("Windows 7 Taskbar Test")

        self.progressbar = QtGui.QProgressBar(self)
        self.setCentralWidget(self.progressbar)
        self.progressbar.setRange(0,100)
        self.timer = QtCore.QTimer(self)
        self.timer.setInterval(100)
        self.connect(self.timer, SIGNAL("timeout()"), self.timer_timeout)
        self.progress = 0
        self.timer.start()

    def timer_timeout(self):
        import comtypes.client as cc
        cc.GetModule("TaskbarLib.tlb")
        import comtypes.gen.TaskbarLib as tbl
        taskbar = cc.CreateObject(
            "{56FDF344-FD6D-11d0-958A-006097C9A090}",
            interface=tbl.ITaskbarList3)
        taskbar.HrInit()
        hWnd = self.winId()
        self.progress += 2
        if self.progress > 100:
            self.progress = 0
        self.progressbar.setValue(self.progress)
        taskbar.SetProgressValue(hWnd,self.progress,100)
        taskbar.SetProgressState(hWnd, TBPF_NORMAL)

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    ui = MyMainWindow()
    ui.show()
    sys.exit(app.exec_())