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CAsyncSocket::AsyncSelect

Call this member function to request event notification for a socket.

BOOL AsyncSelect(
   long lEvent = FD_READ | FD_WRITE | FD_OOB | FD_ACCEPT | FD_CONNECT | FD_CLOSE 
);

Parameters

lEvent
A bitmask which specifies a combination of network events in which the application is interested.
  • FD_READ   Want to receive notification of readiness for reading.
  • FD_WRITE   Want to receive notification when data is available to be read.
  • FD_OOB   Want to receive notification of the arrival of out-of-band data.
  • FD_ACCEPT   Want to receive notification of incoming connections.
  • FD_CONNECT   Want to receive notification of connection results.
  • FD_CLOSE   Want to receive notification when a socket has been closed by a peer.

Return Value

Nonzero if the function is successful; otherwise 0, and a specific error code can be retrieved by calling GetLastError. The following errors apply to this member function:

  • WSANOTINITIALISED   A successful AfxSocketInit must occur before using this API.
  • WSAENETDOWN   The Windows Sockets implementation detected that the network subsystem failed.
  • WSAEINVAL   Indicates that one of the specified parameters was invalid.
  • WSAEINPROGRESS   A blocking Windows Sockets operation is in progress.

Remarks

This function is used to specify which MFC callback notification functions will be called for the socket. AsyncSelect automatically sets this socket to nonblocking mode. For more information, see the article Windows Sockets: Socket Notifications and Windows Sockets 2 API and Windows Sockets Programming Considerations in the Platform SDK.

See Also

CAsyncSocket Overview | Class Members | Hierarchy Chart | CAsyncSocket::GetLastError | WSAAsyncSelect

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