问题描述
如何使用 NSURLConnection sendSynchronousRequest 更好地处理错误?有什么办法可以实现
how can i do better error handling with NSURLConnection sendSynchronousRequest? is there any way i can implement
- (void)connection:(NSURLConnection *)aConn didFailWithError:(NSError *)error
我有一个 nsoperation 队列，它在后台获取数据，这就是我有同步请求的原因.如果我必须实现异步请求，那么我如何等待请求完成.因为没有数据，该方法无法继续.
i have a nsoperation queue which is getting data in background thats why i have sync request.and if i have to implement async request then how can i wait for request to get complete. because that method can't proceed without data.
推荐答案
-sendSynchronousRequest:returningResponse:error: 为您提供了一种直接在方法本身中获取错误的方法.最后一个参数确实是 (NSError **) 错误；也就是说，一个指向 NSError 指针的指针.试试这个:
-sendSynchronousRequest:returningResponse:error: gives you a way to get an error right there in the method itself. That last argument is really (NSError **) error; that is, a pointer to an NSError pointer. Try this:
NSError *error = nil;
NSURLResponse *response = nil;
[NSURLConnection sendSynchronousRequest: req returningResponse: &response error: &error];
if (error) {...handle the error}
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