(Objective-C) Getting the HTTP Response after an Asynchronous HTTP Request Completes

Some HTTP methods return an HTTP response object. This example demonstrates how to obtain the HTTP response object for such a method when calling asynchronously.

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#import <CkoGlobal.h>
#import <CkoHttp.h>
#import <CkoTask.h>
#import <CkoHttpResponse.h>

// All Chilkat classes can be unlocked at once at the beginning of a program
// by calling UnlockBundle.  It requires a Bundle unlock code.
CkoGlobal *chilkatGlob = [[CkoGlobal alloc] init];
BOOL success = [chilkatGlob UnlockBundle: @"Anything for 30-day trial."];
if (success != YES) {
    NSLog(@"%@",chilkatGlob.LastErrorText);
    return;
}

CkoHttp *http = [[CkoHttp alloc] init];

// Call the async version of the QuickGetObj method to return a task object.
// The task object is loaded, but is in the Inert state -- meaning it is
// not yet scheduled to run on Chilkat's background thread pool.
CkoTask *task = [http QuickGetObjAsync: @"https://stackexchange.com"];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// Schedule the task for running on the thread pool.  This changes the task's state
// from Inert to Live.
success = [task Run];
if (success != YES) {
    NSLog(@"%@",task.LastErrorText);

    return;
}

// The application is now free to do anything else
// while the HTML page is being downloaded.

// For this example, we'll simply sleep and periodically
// check to see if the QuickGetObjAsync if finished.
while (task.Finished != YES) {

    // Sleep 100 ms.
    [task SleepMs: [NSNumber numberWithInt: 100]];

}

// A finished task could be one that was canceled, aborted, or truly finished.  

// If the task was "canceled", it was canceled prior to actually starting.  This could
// happen if the task was canceled while waiting in a thread pool queue to be scheduled by Chilkat's
// background thread pool scheduler.  

// If the task was "aborted", it indicates that it was canceled while running in a background thread.  
// The ResultErrorText will likely indicate that the task was aborted.

// If the task "completed", then it ran to completion, but the actual success/failure of the method
// is determined by the result obtained via a GetResult* method.  (A "completed" task will
// have a StatusInt equal to 7.   If the task finished, but was not completed, then it must've
// been aborted or canceled:
if ([task.StatusInt intValue] != 7) {
    NSLog(@"%@",@"Task did not complete.");
    NSLog(@"%@%@",@"task status: ",task.Status);

    return;
}

// The synchronous call to QuickGetObj would return an HTTP response object.  To get this 
// response object for the async call, we instantiate a new/empty HTTP response object,
// and then load it from the completed task.
CkoHttpResponse *resp = [[CkoHttpResponse alloc] init];

success = [resp LoadTaskResult: task];
if (success != YES) {
    NSLog(@"%@",resp.LastErrorText);

    return;
}

// Now that we have the response, we can get all of the information:

NSLog(@"%@%d",@"status code: ",[resp.StatusCode intValue]);
NSLog(@"%@%@",@"response header: ",resp.Header);

// ..