A Sample Lobbied Application Message Handler

The following code is a simplified version of the message handler from the SimplePeer sample in the software development kit (SDK). Error handling code has been removed for clarity. See the sample for a complete version.

HRESULT WINAPI DirectPlayLobbyMessageHandler( PVOID pvUserContext, 
                                              DWORD dwMessageId, 
                                              PVOID pMsgBuffer )
{
  switch( dwMessageId )
  {
    case DPL_MSGID_CONNECT:
    {
      PDPL_MESSAGE_CONNECT pConnectMsg;
      pConnectMsg = (PDPL_MESSAGE_CONNECT)pMsgBuffer;

      // Connected. Start the session.
      break;
    }
    case DPL_MSGID_DISCONNECT:
    {
      PDPL_MESSAGE_DISCONNECT pDisconnectMsg;
      pDisconnectMsg = (PDPL_MESSAGE_DISCONNECT)pMsgBuffer;

      // Disconnected. Free any data associated with
      // the lobby client.
      break;
    }
    case DPL_MSGID_RECEIVE:
    {
      PDPL_MESSAGE_RECEIVE pReceiveMsg;
      pReceiveMsg = (PDPL_MESSAGE_RECEIVE)pMsgBuffer;

      // The lobby client sent data. Process the data and
      // respond appropriately.
      break;
    }

    case DPL_MSGID_CONNECTION_SETTINGS:
    {
      PDPL_MESSAGE_CONNECTION_SETTINGS pConnectionStatusMsg;
      pConnectionStatusMsg = (PDPL_MESSAGE_CONNECTION_SETTINGS)pMsgBuffer;

      // The lobby client has changed the connection settings.  
      break;
    }
  }
  return S_OK;
}