alttab.py 文件源码

def list_alttab_windows(cls):
        """
        Return the list of the windows handles that are currently guessed to be
        eligible to the Alt+Tab panel.
        Raises a OSError exception on error.
        """
        # LPARAM is defined as LONG_PTR (signed type)
        if ctypes.sizeof(ctypes.c_long) == ctypes.sizeof(ctypes.c_void_p):
            LPARAM = ctypes.c_long
        elif ctypes.sizeof(ctypes.c_longlong) == ctypes.sizeof(ctypes.c_void_p):
            LPARAM = ctypes.c_longlong
        EnumWindowsProc = ctypes.WINFUNCTYPE(
                                ctypes.c_bool, ctypes.c_void_p, LPARAM)

        def _enum_proc(hwnd, lparam):
            try:
                if cls.is_alttab_window(hwnd):
                    handles.append(hwnd)
            except OSError:
                pass
            return True

        handles = []
        ctypes.windll.user32.EnumWindows(EnumWindowsProc(_enum_proc), 0)
        return handles