Use Winsock insde DShow Filter

I am trying开发者_开发技巧 to develop a DirectShow filter with internet access.

When I try to use Winsock,

1) In TCP, I wait connections but cannot access to server (try with Telnet) and

2) In UDP in data wait step (recvfrom(...)) program breaks.

Is it not possible? Or do I have to change library settings for the filter?

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Do you remember to call WSAStartup before creating sockets?

Also do you check your return values from calls such as "socket"? Its definitely not returning an INVALID_SOCKET?