AutoreleasePool NSString Automatic Reference Counting

Question

I have some doubt about how NSString is released in ARC Mode.

I would like to know if have something i can do to release a nsstring when i want in arc mode.

Take a look at this code:

__block NSString *strImage = nil;
 dispatch_sync(backGround, ^{
 // Convert NSData To NSString.
 strImage = [UIImagePNGRepresentation([UIImage imageWithData:reg.photoData]) base64Encoding];
 });
 // Prepare Request Operation.
 NSString * strPost = @"myUrl";
 strPost = [strPost stringByAppendingFormat:@"}&image="];
 strPost = [strPost stringByAppendingFormat:@"%@",strImage];
 //NSLog(@"POST: %@",strPost);
 // setting up the URL to post to
 NSString *urlString = @"myURLAPI";
 // setting up the request object now
 NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
 [request setURL:[NSURL URLWithString:urlString]];
 [request setHTTPMethod:@"POST"];
 /*
 add some header info now
 we always need a boundary when we post a file
 also we need to set the content type
 You might want to generate a random boundary.. this is just the same
 as my output from wireshark on a valid html post
 */
 NSString *contentType = [NSString stringWithFormat:@"application/x-www-form-urlencoded"];
 [request addValue:contentType forHTTPHeaderField: @"Content-Type"];
 /*
 now lets create the body of the post
 */
 NSMutableData *body = [NSMutableData data];
 [body appendData:[NSData dataWithData:[strPost dataUsingEncoding:NSUTF8StringEncoding]]];
 // setting the body of the post to the reqeust
 [request setHTTPBody:body];
 AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];
 //MY DOUBT ABOUT RELEASE THIS STR
 @autoreleasepool {
 strImage = nil;
 }

is it correct or have a best way to do it? Thank you

Answer 1

Also @autoreleasepool does not look are the objects create outside of it scope, just the object used within. Also if using are there is not need for the @autoreleasepool at all, since the scope variables will be released and nilled at the end of the scope.

• Juan Munhoes: so when my function end the str compiler knows that this str need to release? dont i need the autorelease?