objective c从url请求解析json [英] objective c parse json from url request

问题描述

我正在尝试解析从位于以下位置的api请求的json字符串：
http://www.physics.leidenuniv.nl/json/news.php

但是，我在解析这个json时遇到了问题。
我收到以下错误：
字符串解析期间文件意外结束

I已经找了几个小时，但我找不到这个问题的答案。

我的代码片段：

在我的viewDidLoad中：

  NSURLRequest * request = [NSURLRequest requestWithURL：
 [NSURL URLWithString：@http：// www.physics.leidenuniv.nl/json/news.php]]; 
 
 [[NSURLConnection alloc] initWithRequest：request delegate：self]; 
  

代表：

   - （void）connection：（NSURLConnection *）connection didReceiveData：（NSData *）data {
 NSMutableData * responseData = [[NSMutableData alloc] init]; 
 [responseData appendData：data]; 
 
 NSString * responseString = [[NSString alloc] initWithData：responseData encoding：NSUTF8StringEncoding]; 
 NSError * e = nil; 
 NSData * jsonData = [responseString dataUsingEncoding：NSUTF8StringEncoding]; 
 NSDictionary * JSON = [NSJSONSerialization JSONObjectWithData：jsonData options：NSJSONReadingMutableContainers error：& e]; 
} 
  

任何人都知道这个问题的答案，所以我可以解析json数据吗？这是这样的：

   - （void）connection：（NSURLConnection *）connection didReceiveData：（NSData *）data 
 {
 //将新数据附加到receivedData。 
 // receivedData是在别处声明的实例变量。 
 
 [responseData appendData：data]; 
} 
 
 
  - （void）connectionDidFinishLoading：（NSURLConnection *）connection 
 {
 NSString * responseString = [[NSString alloc] initWithData：responseData encoding ：NSUTF8StringEncoding]; 
 NSError * e = nil; 
 NSData * jsonData = [responseString dataUsingEncoding：NSUTF8StringEncoding]; 
 NSDictionary * JSON = [NSJSONSerialization JSONObjectWithData：jsonData options：NSJSONReadingMutableContainers error：& e]; 
 
} 
  

I am trying to parse a json string requested from an api located at: http://www.physics.leidenuniv.nl/json/news.php

However, i am having trouble parsing this json. I get the following error: Unexpected end of file during string parse

I have looked for hours, but I can not find an answer to this problem.

My code snippet:

In my viewDidLoad:

NSURLRequest *request = [NSURLRequest requestWithURL:
                         [NSURL URLWithString:@"http://www.physics.leidenuniv.nl/json/news.php"]];

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

The delegate:

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
NSMutableData *responseData = [[NSMutableData alloc] init];
[responseData appendData:data];

NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSError *e = nil;
NSData *jsonData = [responseString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:jsonData options: NSJSONReadingMutableContainers error: &e];
}

Anybody know an answer to this problem so i can parse the json data?

解决方案

Do this way:

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    // Append the new data to receivedData.
    // receivedData is an instance variable declared elsewhere.

    [responseData appendData:data];
}


- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSError *e = nil;
NSData *jsonData = [responseString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:jsonData options: NSJSONReadingMutableContainers error: &e];

}

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