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As quark said, the functionality is not in Qt 4.5, but you can call the windows API directly from Qt. Its a little bit of work though. <ol> <li>The new taskbar API is exposed through COM, so you can't use ctypes.windll . You need to create a .tlb file to access the functions. Get the interface definition for ITaskbarList from <a href="http://www.neowin.net/forum/index.php?s=6352ade29ce66f2b51506c64e455d2f4&showtopic=716968&st=0&p=590434472&#entry590434472" rel="noreferrer">this forum post</a> , or from the windows SDK. Save it to a file called e.g. TaskbarLib.idl .</li> <li>Create the .tlb file. You'll probably need the Windows SDK, or get an IDL compiler from somewhere else. <pre><code>midl TaskbarLib.idl /tlb TaskbarLib.tlb </code></pre></li> <li>Load the .tlb (you need the Win32 Extensions for Python, <a href="http://python.net/crew/skippy/win32/Downloads.html" rel="noreferrer">http://python.net/crew/skippy/win32/Downloads.html</a>): <pre><code>import comtypes.client as cc cc.GetModule("TaskbarLib.tlb") </code></pre></li> <li>Create the TaskbarList object. The function for setting the progress bar is in the interface ITaskbarList3: <pre><code>import comtypes.gen.TaskbarLib as tbl taskbar = cc.CreateObject( "{56FDF344-FD6D-11d0-958A-006097C9A090}", interface=tbl.ITaskbarList3) </code></pre></li> <li>Now you can call the API functions: <pre><code>taskbar.HrInit() taskbar.SetProgressValue(self.winId(),40,100) </code></pre></li> </ol> Here's a <a href="http://pastebin.com/f7ed294a8" rel="noreferrer">complete example script</a>. Sources: <a href="http://aspn.activestate.com/ASPN/Mail/Message/python-win32/3757531" rel="noreferrer">1</a> <a href="http://www.neowin.net/forum/index.php?s=6352ade29ce66f2b51506c64e455d2f4&showtopic=716968&st=0&p=590434472&#entry590434472" rel="noreferrer">2</a>
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