Objective-C

Async Accept Socket Connection

See more Socket/SSL/TLS Examples

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

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

BOOL success = NO;

//  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.
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.