(CkPython) Async Accept Socket Connection

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

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import sys
import chilkat

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

listenSocket = chilkat.CkSocket()

# Bind to a port and listen.
# This example will listen at port 5555 and allows for a backlog
# of 25 pending connection requests.
success = listenSocket.BindAndListen(5555,25)
if (success != True):
    print(listenSocket.lastErrorText())
    sys.exit()

# Start a background task to accept an incoming connection ...
maxWaitMs = 20000
# acceptTask is a CkTask
acceptTask = listenSocket.AcceptNextConnectionAsync(maxWaitMs)
acceptTask.Run()

# ...
# ...
# ...

# Imagine at this point the task has completed successfully,
# and a connection was accepted.  Here's how to get the connected socket...
connectedClient = chilkat.CkSocket()
success = connectedClient.LoadTaskResult(acceptTask)

# 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.