Python + Tkinter Windows 7 taskbar progress

问题

I want to show the progress of my app in a taskbar button. I used this answer as a reference.

Here's an example of what I do:

import tkinter

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)

class gui(object):
    def __init__(self, root):
        self.root = root

if __name__ == "__main__":
    root = tkinter.Tk()
    app = gui(root)

    taskbar.HrInit()
    taskbar.SetProgressValue(root.winfo_id(),40,100)

    root.mainloop()

But I see no progress on a taskbar button. What do I do wrong?

回答1:

The tab needs to be activated. Add taskbar.ActivateTab(root.winfo_id()) after taskbar.HrInit(). In tkinter is better to use int(root.wm_frame(), 16) instead root.winfo_id() because otherwise near tkinter tab will appear a python tab with a progressbar. At the end taskbar.SetProgressState(HWND, TBPF_NOPROGRESS) should be called to remove the progressbar.

The flags need to be defined. Eg. TBPF_NOPROGRESS = 0. Check Microsoft's webpage for more options: https://msdn.microsoft.com/en-us/library/windows/desktop/dd391697%28v=vs.85%29.aspx

I know this is an old question but maybe someone will find it useful.