Visual FoxPro

Async Accept Socket Connection

See more Socket/SSL/TLS Examples

Demonstrates how to get the connected client socket after accepting a connection asynchronously. Visual FoxPro

LOCAL lnSuccess
LOCAL loListenSocket
LOCAL lnMaxWaitMs
LOCAL loAcceptTask
LOCAL loConnectedClient

lnSuccess = 0

* This example assumes the Chilkat Socket API to have been previously unlocked.
* See Socket Unlock Sample for sample code.

loListenSocket = CreateObject('Chilkat.Socket')

* Bind to a port and listen.
* This example will listen at port 5555 and allows for a backlog
* of 25 pending connection requests.
lnSuccess = loListenSocket.BindAndListen(5555,25)
IF (lnSuccess <> 1) THEN
    ? loListenSocket.LastErrorText
    RELEASE loListenSocket
    CANCEL
ENDIF

* Start a background task to accept an incoming connection ...
lnMaxWaitMs = 20000
loAcceptTask = loListenSocket.AcceptNextConnectionAsync(lnMaxWaitMs)
loAcceptTask.Run()

* ...
* ...
* ...

* Imagine at this point the task has completed successfully,
* and a connection was accepted.  Here's how to get the connected socket...
loConnectedClient = CreateObject('Chilkat.Socket')
lnSuccess = loConnectedClient.LoadTaskResult(loAcceptTask)

* Here's how it works:  The AcceptNextConnection method would normally
* return a socket object when called synchronously.  When called asynchronously,
* it cannot do so because it returns the task object.  When the async method
* (running in a background thread) completes, the socket object that is the client
* connection is contained within the task object.
* 
* This can be generalized for any case where a Chilkat method returns an object.
* The async version of that method is such that the object returned in the background
* thread is contained within the task object.

* To get the result object, we create a new object instance of that type.
* In this case, we create a socket object (connectedClient).  There is a LoadTaskResult
* method in all Chilkat classes that can be a return value of an async method call.
* The LoadTaskResult method transfers the returned object from the task to the caller.

RELEASE loListenSocket
RELEASE loConnectedClient