使用HTTPRequestOperationWithRequest方法创建一个对象失败

一个iOS的single view项目，想要使用HTTPRequestOperationWithRequest方法创建一个对象，但是不知道这么使用。

• (IBAction)jsonTapped:(id)sender { NSString *weatherUrl = [NSString stringWithFormat:@"%@weather.php?format=json",BaseURLString]; NSURL *url = [NSURL URLWithString:weatherUrl]; NSURLRequest *request = [NSURLRequest requestWithURL:url];

**‘AFHTTPRequestOperation *operation = [AFHTTPRequestOperation    HTTPRequestOperationWithRequest:request success:^(AFHTTPRequestOperation *operation, id responseObject) failure:^(AFHTTPRequestOperation *operation, NSError *error)];’** 

[operation start];
}

##

就是上图分割线粗体高亮处报错expected expression，调了一晚上，都快哭了，呜呜呜～

希望有大虾能帮忙一下啊！

附AFNetworking源码：
- (AFHTTPRequestOperation *)HTTPRequestOperationWithRequest:(NSURLRequest *)request
success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
{
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.responseSerializer = self.responseSerializer;
operation.shouldUseCredentialStorage = self.shouldUseCredentialStorage;
operation.credential = self.credential;
operation.securityPolicy = self.securityPolicy;
[operation setCompletionBlockWithSuccess:success failure:failure];
operation.completionQueue = self.completionQueue;
operation.completionGroup = self.completionGroup;
return operation;
}

＃＃＃＃＃＃
谢啦！！！

http://bbs.csdn.net/topics/390422891

可以看看这个 http://www.code4app.com/forum.php?mod=viewthread&tid=10071&extra=page%3D1%26filter%3Dsortid%26sortid%3D1