python - 无法通过 ERROR_INVALID_HANDLE 关闭套接字句柄 (6)

Question

我正在ctypes中使用winsock2套接字，我可以很好地执行closesocket()，但是调用CloseHandle，总是会导致ERROR_INVALID_HANDLE (6)。我该如何正确关闭它？目前我的应用程序总是在 64 次 socket() 调用后崩溃。

# from MSDN:
# BOOL CloseHandle(   HANDLE hObject);

closehandle = coredll.CloseHandle
closehandle.argtypes = [ w.LPVOID ]

SOCKET = c_ulong
socket = ws2.socket
socket.restype = SOCKET
self._clnt_socket = socket(AF_BT, SOCK_STREAM, BTHPROTO_RFCOMM)
...
connect( self._clnt_socket, _psa, sizeof(self._sa) )
...
send( self._clnt_socket, pbuff, szbuff, 0 ) # int send(  SOCKET s,  const char FAR* buf,  int len,  int flags);

SetLastError(0)
rt = closesocket( self._clnt_socket )
ec = GetLastError()
if ec != w.ERROR_SUCCESS :
    print( u'failed to close socket, ec=%s, %s, rt=%s', (ec, FormatError( ec ), rt) )
    raise Exception(u'BT_SOCKET.close.socket %s' % ec)
else:
    print( u'close socket ok' )
#> close socket ok

# from MSDN:
# To close the connection to the target device, call the closesocket
# function to close the Bluetooth socket. Also, ensure that you release
# the socket by calling the CloseHandle function, as the following
# example code shows.  
#
# closesocket(client_socket); 
# CloseHandle((LPVOID)client_socket);

SetLastError(0)
rt = closehandle(  w.LPVOID( self._clnt_socket ) )
ec = GetLastError()
if ec != w.ERROR_SUCCESS :
    print( u'failed to close handle, ec=%s, %s, rt=%s ', (ec, FormatError( ec ), rt) )
    # //Perform error handling.
    raise Exception(u'BT_SOCKET.close.handle %s' % ec)
else:
    print( u'close socket ok' )
#> failed to close handle, ec=6

Answer 1

HANDLE和SOCKET是不同类型的对象，因此它们不兼容(适用于它们的Python> wrapper 也是如此)。

这就是 [MS.Docs]: CloseHandle function状态:

Do not use the CloseHandle function to close a socket. Instead, use the closesocket function, which releases all resources associated with the socket including the handle to the socket object. For more information, see Socket Closure.

@EDIT0:

• 以上内容适用于“正常”Win。 [MS.Docs]: CloseHandle (Windows CE 5.0)没有指定该段落，并且还提到它可以在Socket上使用。

• [MS.Docs]: socket (Windows Sockets) (Windows CE 5.0)状态:

  When a session has been completed, a closesocket call must be performed.

• [MS.Docs]: Creating a Connection to a Remote Device Using Winsock (Windows CE 5.0)确实指定调用CloseHandle，但仅在客户端套接字的步骤#5中(不在步骤#4，也不用于服务器套接字)，这让我认为这是一个错误(WinCE页面充满了错误 - 至少是拼写错误)

作为一个附带问题:你为什么使用ctypes而不是[Python 3]: socket - Low-level networking interface这是 WinSock 的包装器？这就像搬起石头砸自己的脚。如果BT套接字的工作方式与其他套接字(例如网络)相同，那么您唯一需要做的就是定义一些常量(例如BTHPROTO_RFCOMM)。