(Objective-C) Async Accept Socket Connection

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

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#import <CkoSocket.h>
#import <CkoTask.h>

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

CkoSocket *listenSocket = [[CkoSocket alloc] init];

// Bind to a port and listen.
// This example will listen at port 5555 and allows for a backlog
// of 25 pending connection requests.
BOOL success = [listenSocket BindAndListen: [NSNumber numberWithInt: 5555] backlog: [NSNumber numberWithInt: 25]];
if (success != YES) {
    NSLog(@"%@",listenSocket.LastErrorText);
    return;
}

// Start a background task to accept an incoming connection ...
int maxWaitMs = 20000;
CkoTask *acceptTask = [listenSocket AcceptNextConnectionAsync: [NSNumber numberWithInt: 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...
CkoSocket *connectedClient = [[CkoSocket alloc] init];
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.