使用目标 C 解析 JSON?

我花了 1 周时间学习目标 C.现在我在处理数据部分很困惑.我朋友给了我一个链接http://nrj.playsoft.fr/v3/getQuiz.php?udid=23423455&app=2并让我写一个类来解析这个 JSON.我不知道解析 JSON 是什么意思.但我上网查了一下.我可以理解它的基础知识，然后我实现了一些代码来解析这个 JSON.这是:

I have spent 1 week studying objective C. Now I am quite confused at the dealing with data part. My friend gave me a link http://nrj.playsoft.fr/v3/getQuiz.php?udid=23423455&app=2 and ask me write a class to parse this JSON. I had no clue what parsing JSON means. but I have gone online and looked up. I could understand a basics of it and then I impletemented a punch of code to parse this JSON. Which is:

-

(void)parseURL
{
    //create new SBJSON object 
    SBJSON *parser = [[SBJSON alloc] init];
    NSError *error = nil;
    //perform request from URL 
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://nrj.playsoft.fr/v3/getQuiz.php?udid=23423455&app=2"]];
    // Perform request and get JSON back as a NSData object
    NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&error];

    // Get JSON as a NSString from NSData response
    NSString *json_string = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];

    // parse the JSON response into an object

    NSDictionary *results = [parser objectWithString:json_string error:&error];
    // array just for the "answer" results
    NSArray *quizes = [results objectForKey:@"quiz"];

    NSDictionary *firstQuiz = [quizes objectAtIndex:0];
    // finally, the name key
    NSString *extract = [firstQuiz objectForKey:@"extract"];
    NSLog(@"this is: %@", [extract valueForKey:@"extract"]); 

}

这是在实现文件中，但在头文件中我无法声明任何变量，它会打印出一些错误.我试图运行它，没有错误，但我不确定这段代码是否正确.我的朋友让我在现有项目中编写一个类.我不知道哪些需要修改，哪些不需要.我现在很迷茫.任何专业人士都可以帮我一把.?衷心感谢.

This is at the implementation file, but in the header file I could not declare any variables, it will print out some errors. I tried to run this, there is no errors, but I am not sure this code is correct or not. And my friend asked me to write a class into an existing project. I don't know what needs to be modified and what not. I am so blur right now. Could anyone pro in this give me a hand. ? My sincere thanks.

谢谢回复.我也下载并添加了 JSON 框架.我只是不确定从哪里开始和在哪里结束，这意味着我在向其中添加 JSON 框架时应该执行的步骤.我能理解语法，但我不确定我应该做的步骤.我是这方面的新手.

Thanks for reply. I have downloading and added the JSON framework ealier too. I am just not sure where to begin and where to end, meaning the step I should do when I add JSON framework into it. I could understand the syntax but I am not sure about the steps I should do. I am a newbie in this.