如何在 iPhone 中中止同步 URL 请求

发布于 2024-10-23 19:44:07 字数 839 浏览 1 评论 0原文

我有一个 API 调用。需要2分多钟才能得到服务器的响应。我如何在处理时手动中止它？

这是我的代码：

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
[request setTimeoutInterval: 600.0];
[request setHTTPMethod:@"GET"];

NSMutableDictionary* headers = [[[NSMutableDictionary alloc] init] autorelease];

[headers setValue:@"application/json" forKey:@"Content-Type"];
[headers setValue:@"application/json" forKey:@"Accept"];
[headers setValue:val forKey:@"Authorization"];

[request setAllHTTPHeaderFields:headers];   

NSError *Error;
NSURLResponse *response = [[NSURLResponse alloc] init];

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&Error];

[[NSURLConnection alloc] initWithRequest:request delegate:self];

如何在处理请求时中止请求。

谢谢

原文

I have an API call. It takes more than 2 minute to get a response from the server. how can i abort it manually while it is processing?

Here is my code:

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
[request setTimeoutInterval: 600.0];
[request setHTTPMethod:@"GET"];

NSMutableDictionary* headers = [[[NSMutableDictionary alloc] init] autorelease];

[headers setValue:@"application/json" forKey:@"Content-Type"];
[headers setValue:@"application/json" forKey:@"Accept"];
[headers setValue:val forKey:@"Authorization"];

[request setAllHTTPHeaderFields:headers];   

NSError *Error;
NSURLResponse *response = [[NSURLResponse alloc] init];

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&Error];

[[NSURLConnection alloc] initWithRequest:request delegate:self];

how can i abort the request while its processing.

Thanks

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衣神在巴黎 2024-10-30 19:44:07

你不能。如果您希望能够取消，请使用异步连接。

另外，顺便说一句，您的代码中有一些错误：

NSError *Error;
NSURLResponse *response = [[NSURLResponse alloc] init];

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&Error];

[[NSURLConnection alloc] initWithRequest:request delegate:self];

为了更好地衡量，Error 应该初始化为 nil。
您正在泄漏响应。将其初始化为 nil，sendSynchronousRequest:returningResponse:error: 将填充它（无论如何，如果请求成功）。
[[NSURLConnection alloc] initWithRequest:request delegate:self] 行启动异步连接并释放它，在您已经为同一请求创建了同步连接。并且它泄漏了 NSURLConnection 对象。您是否在您的 self 对象上实现了非正式委托协议的必要方法？

You can't. Use asynchronous connections if you want to be able to cancel.

Also, BTW, you have some errors in your code:

NSError *Error;
NSURLResponse *response = [[NSURLResponse alloc] init];

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&Error];

[[NSURLConnection alloc] initWithRequest:request delegate:self];

For good measure, Error should be initialized to nil.
You are leaking response. Initialize it to nil, and sendSynchronousRequest:returningResponse:error: will fill it in (if the request succeeds, anyway).
The line [[NSURLConnection alloc] initWithRequest:request delegate:self] starts an asynchronous connection and releases it, after you already did a synchronous connection for the same request. And it leaks the NSURLConnection object. Did you even implement the necessary methods for the informal delegate protocol on your self object?