Restart Dropbox in case it hangs itself, again *sigh*

import os, subprocess, ctypes, struct

# TODO: consolidate tray refresher methods into class

WM_MOUSEMOVE = 0x200
winapi = ctypes.windll.user32

class Rectangle(ctypes.Structure):
    _fields_ = [("left", ctypes.c_int32),
                ("top", ctypes.c_int32),
                ("right", ctypes.c_int32),
                ("bottom", ctypes.c_int32)]

def _atLeastWin7():
    packed_version = ctypes.windll.kernel32.GetVersion()
    (major, minor, build) = struct.unpack('<BBH', struct.pack('<L', packed_version))
    return major > 6 or (major == 6 and minor >= 1)

def _findWindow(parent, winclass):
    return winapi.FindWindowExW(parent, None, winclass, None)

def _findTray():
    hwnd1 = _findWindow(None, "Shell_TrayWnd")
    if hwnd1:
        hwnd2 = _findWindow(hwnd1, "TrayNotifyWnd")
        if hwnd2:
            hwnd3 = _findWindow(hwnd2, "SysPager")
            if hwnd3:
                return _findWindow(hwnd3, "ToolbarWindow32")

def _findOverflowTray():
    hwnd1 = _findWindow(None, "NotifyIconOverflowWindow")
    if hwnd1:
        return _findWindow(hwnd1, "ToolbarWindow32")

def _fakeCursorMovement(hwnd, x, y):
    # XXX: check that x, y are short ints
    return winapi.SendMessageW(hwnd, WM_MOUSEMOVE, 0, (y << 16) + x) == 0

def _touchWindow(hwnd):
    r = Rectangle()
    if winapi.GetClientRect(hwnd, ctypes.byref(r)):
        for x in range(0, r.right, 5):
            for y in range(0, r.bottom, 5):
                _fakeCursorMovement(hwnd, x, y)

def refreshTray():
    hwnd = _findTray()
    if hwnd:
        _touchWindow(hwnd)
    if _atLeastWin7():
        hwnd = _findOverflowTray()
        if hwnd:
            _touchWindow(hwnd)

if __name__ == '__main__':
    print("Killing Dropbox...")
    os.system("taskkill /F /IM Dropbox.exe")

    print("Refreshing tray...")
    refreshTray()

    print("Restarting Dropbox...")
    app = os.environ["APPDATA"] + "\\Dropbox\\bin\\Dropbox.exe"
    subprocess.Popen([app, "/systemstartup"])