从iPhone应用程序进行GET和POST请求 - 需要澄清 [英] Making GET and POST Requests from an iPhone Application - Clarification Needed

问题描述

我随同这个有用的回答我的问题。

它似乎工作，但这里有两个问题：

1. 如何检测HTTP错误？ didFailWithError方法似乎没有被调用？

UPDATE： 它认为任何回复成功。所以我想我必须处理HTTP错误didRecieveResponse方法，但除了告诉用户有一个错误，当我碰到HTTP错误，我需要停止连接不知何故？

2. 我在回答中看到这一行：
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  [[NSURLConnection alloc] initWithRequest：request delegate：self]; 
  




我需要发布吗？在何处，如何，何时？

解决方案

您将获得didReceiveResponse中返回的状态代码

   - （void）connection：（NSURLConnection *）connection didReceiveResponse：（NSURLResponse *）response {
 NSHTTPURLResponse * httpResponse; 
 httpResponse =（NSHTTPURLResponse *）response; 
 int statusCode = [httpResponse statusCode]; 
 // statusCode将是返回的http代码201,500 
} 
  

停止连接，对连接使用类级变量。最好的办法是创建一个发送请求和接收响应的包装器。使你的viewcontroller成为这个类的一个委托，每当didReceiveResponse给出错误状态代码，调用委托的适当方法并停止连接。





这是一个好的包装类示例





http：/ /kosmaczewski.net/projects/objective-c-rest-client/




I'm following along with this useful looking answer to my question.

It seems to be working, but here are two questions I have:

1. How do I detect an HTTP error? The didFailWithError method doesn't seem to be getting called?

UPDATE: It considers any response a success. So I guess I have to handle HTTP errors in the didRecieveResponse method, but besides telling the user there was an error when I hit an HTTP error, do I need stop the connection somehow? And/or cleanup?

2. I see this line in the answer:

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

Do I need to release that? Where, how, when?

解决方案

You will get the status code returned in the didReceiveResponse

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    NSHTTPURLResponse *httpResponse;
    httpResponse = (NSHTTPURLResponse *)response;
    int statusCode = [httpResponse statusCode];
    //statusCode will be the http code returned like 201,500
 }

For stopping the connection, use a class-level variable for the connection. The best way to go about it would be create a wrapper which sends requests and receives response. Make your viewcontroller a delegate of this class and whenever the didReceiveResponse gives an error status code, call the appropriate method of the delegate and stop the connection.

Here's a good wrapper class example

http://kosmaczewski.net/projects/objective-c-rest-client/

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