PyFilesystem中异常"LP_OVERLAPPED实例而不是指向重叠的指针“

Question

我们在项目中使用PyFilesystem。它在Windows7 x64上运行良好，但在Windows7 x32上会引发一个异常：

Exception in thread Thread-28:
Traceback (most recent call last):
   File "C:\Python34\lib\threading.py", line 911, in _bootstrap_inner
     self.run()
   File "C:\environment\lib\site-packages\fs\osfs\watch_win32.py", line 365, in run
     -1)
ctypes.ArgumentError: argument 4: <class 'TypeError'>: expected LP_OVERLAPPED instance instead of pointer to OVERLAPPED

发生异常的代码：

...
overlapped = OVERLAPPED()
while not self.closed:
    try:
        GetQueuedCompletionStatus(self._iocp,
                                  ctypes.byref(nbytes),
                                  ctypes.byref(iocpkey),
                                  ctypes.byref(overlapped),
                                  -1)
    except WindowsError:
        traceback.print_exc()
    ...

如果有任何帮助，我将不胜感激。

Answer 1

我也遇到了同样的问题，这是因为在这种情况下，watchdog中有另一个模块为相同的函数定义了参数。我建议把GetQueuedCompletionStatus.argtypes打印出来。这将给你一个提示，哪个模块的PyFilesystem是冲突的。

在这种情况下我的输出是：

(<class 'ctypes.c_void_p'>, <class 'ctypes.c_void_p'>, <class 'ctypes.c_void_p'>, <class 'watchdog.observers.winapi.LP_OVERLAPPED'>, <class 'ctypes.c_ulong'>)

第四个参数指向watchdog.observers.winapi.LP_OVERLAPPED，这将您带到您的问题所在。