Objective-C

Async Methods Returning an String

See more Async Examples

Demonstrates how to call an asynchronous method that returns a string. This example sends an HTTPS GET request to a URL and gets the HTML response. Objective-C

#import <CkoHttp.h>
#import <CkoTask.h>
#import <NSString.h>

BOOL success = NO;

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

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

CkoTask *task = [http QuickGetStrAsync: @"https://www.chilkatsoft.com/helloWorld.html"];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// Start the background task.
success = [task Run];
if (!success) {
    NSLog(@"%@",task.LastErrorText);

    return;
}

// The application is now free to do anything else

// For this example, we'll simply sleep and periodically
// check to see if the HTTPS GET 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 QuickGetStr method returns a string.  Therefore, after the task is finished,
// we can get the string result by calling GetResultString.  This is the return value had
// we called QuickGetStr synchronously.
NSString *html = [task GetResultString];

NSLog(@"%@",html);