无法关闭套接字句柄,错误为\u INVALID\u handle(6)

我正在C类型中使用winsock2套接字,我可以 closesocket() 很好,但是调用CloseHandle,总是会导致 ERROR_INVALID_HANDLE (6) .我应该如何正确关闭它?当前,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