NSJSONSerialization解析响应数据 [英] NSJSONSerialization parsing response data

问题描述

我创建了一个WCF服务，它为我的POST操作提供以下响应：

I created a WCF service, which provides the following response to my POST operation:

"[{\"Id\":1,\"Name\":\"Michael\"},{\"Id\":2,\"Name\":\"John\"}]"

我对JSONObjectWithData的调用，不会返回任何错误，但我无法枚举结果，我做错了什么？

My call to JSONObjectWithData, doesn't return any error, yet I can't enumerate over the results, what am I doing wrong?

NSError *jsonParsingError = nil;
NSMutableArray *jsonArray = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&jsonParsingError];

NSLog(@"jsonList: %@", jsonArray);

if(!jsonArray)
{
    NSLog(@"Error parsing JSON:%@", jsonParsingError);
}
else
{
    // Exception thrown here.        
    for(NSDictionary *item in jsonArray)
    {
        NSLog(@"%@", item);
    }
}

推荐答案

As杰里米指出，你不应该逃避JSON数据中的引号。但是，你也引用了返回字符串。这使它成为一个JSON字符串，而不是一个对象，所以当你解码它时你有一个字符串，而不是一个可变数组，这就是为什么当你试图快速迭代时你得到一个错误......你不能快速迭代字符串。

As Jeremy pointed out, you shouldn't escape the quotes in the JSON data. But also, you've quoted the return string. That makes it a JSON string, not an object, so when you decode it you've got a string, not a mutable array, which is why you get an error when you try to fast iterate... you're not able to fast iterate over a string.

您的实际JSON应如下所示： [{Id：1，Name：Michael} ，{ ID：2 名称： 约翰}] 。没有报价，没有逃脱。消除JSON对象周围的引号后，您的应用程序将不再崩溃，但随后您将获得格式错误的数据（转义）的JSON反序列化错误。

Your actual JSON should look like: [{"Id":1,"Name":"Michael"},{"Id":2,"Name":"John"}]. No quotes, no escapes. Once you eliminate the quotes around your JSON object, your app won't crash anymore, but then you're going to get a JSON deserialization error for malformed data (the escapes).

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