xwrappers.py 文件源码

def get_window_prop(dpy, window, prop_name, max_size=2):
    """
    Returns (nitems, property) of specified window or (-1, None) if anything fails.
    Returned 'property' is POINTER(c_void_p) and has to be freed using X.free().
    """
    prop_atom = intern_atom(dpy, prop_name, False)
    type_return, format_return = Atom(), Atom()
    nitems, bytes_after = c_ulong(), c_ulong()
    prop = c_void_p()

    if SUCCESS == get_window_property(dpy, window,
                prop_atom, 0, max_size, False, ANYPROPERTYTYPE,
                byref(type_return), byref(format_return), byref(nitems),
                byref(bytes_after), byref(prop)):
        return nitems.value, prop
    return -1, None