CODEWITHSUNDEEP
iosobjective-cclassnsurlconnection
Peter Stuart
Peter Stuart

Reputation: 2434

Why is didReceiveData function not working

I have a class which is used to get data from my server. The data returned from my server is in JSON. For some reason the didReceiveData won't run at all. I have placed NSLogs inside it to test it but it doesn't do anything?

Here is my code:

+(NSJSONSerialization *) getTask:(id)task_id{

    NSString *post = [NSString stringWithFormat:@"&task_id=%@", task_id];

    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%lu",(unsigned long)[postData length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://my-server.com/"]]];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Current-Type"];
    [request setHTTPBody:postData];

    NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];

    if(conn){
        NSLog(@"Testing");
    }

    return json;
}

// Log the response for debugging
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data {
    NSLog(@"test");
    NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    json = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];
}

// Declare any connection errors
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    NSLog(@"Error: %@", error);
}

Thanks,

Peter

Upvotes: 1

Views: 425

Answers (2)

Martin R
Martin R

Reputation: 539835

getTask: is a class method, which means the self is the class. Therefore the delegate methods must also be class methods.

But note that you cannot return the received JSON from the getTask: method, because NSURLConnection works asynchronously.

Upvotes: 3

Corey
Corey

Reputation: 5818

You need to start the connection. Try using the initWithRequest:delegate:startImmediately: method:

NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self startImmediately:YES];

or, just call the start method:

if(conn){
    [conn start];
}

Upvotes: 1

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