Lianja

Bind and Listen for Incoming Connections

Demonstrates Socket.BindAndListen, which binds a TCP listener to a port and places it into listening mode, then accepts an incoming connection.

Background. The backlog argument bounds the queue of pending connections. When ClientIpAddress is empty, the listener binds to all interfaces. After listening, call AcceptNext to accept connections.

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llSuccess = .F.

loSocket = createobject("CkSocket")

//  Bind a TCP listener to a port and place it into listening mode.  The 2nd argument is the backlog,
//  the maximum number of pending connections allowed to queue.
llSuccess = loSocket.BindAndListen(5000,25)
if (llSuccess = .F.) then
    ? loSocket.LastErrorText
    release loSocket
    return
endif

//  After the listener is established, accept the next incoming connection into a new Socket.
loConnectedSock = createobject("CkSocket")
llSuccess = loSocket.AcceptNext(20000,loConnectedSock)
if (llSuccess = .F.) then
    ? loSocket.LastErrorText
    release loSocket
    release loConnectedSock
    return
endif

? "Accepted a connection."


release loSocket
release loConnectedSock