问题描述
能否请您告诉我如何传递如下所示的 JSON 字符串:
Could you please tell me how to pass a JSON String which looks like this:
{"lessons":[{"id":"38","fach":"D","stunde":"t1s1","user_id":"1965","timestamp":"0000-00-00 00:00:00"},{"id":"39","fach":"M","stunde":"t1s2","user_id":"1965","timestamp":"0000-00-00 00:00:00"}]}
我试过这样:
SBJSON *parser =[[SBJSON alloc] init];
NSArray *list = [[parser objectWithString:JsonData error:nil] copy];
[parser release];
for (NSDictionary *stunden in list)
{
NSString *content = [[stunden objectForKey:@"lessons"] objectForKey:@"stunde"];
}
提前致谢
最好的问候
推荐答案
请注意，您的 JSON 数据具有以下结构:
Note that your JSON data has the following structure:
- 顶级值是一个对象(字典)，它有一个名为课程"的属性
- 课程"属性是一个数组
- lessons"数组中的每个元素都是一个对象(包含课程的字典)，具有多个属性，包括stunde"
对应的代码是:
SBJSON *parser = [[[SBJSON alloc] init] autorelease];
// 1. get the top level value as a dictionary
NSDictionary *jsonObject = [parser objectWithString:JsonData error:NULL];
// 2. get the lessons object as an array
NSArray *list = [jsonObject objectForKey:@"lessons"];
// 3. iterate the array; each element is a dictionary...
for (NSDictionary *lesson in list)
{
// 3 ...that contains a string for the key "stunde"
NSString *content = [lesson objectForKey:@"stunde"];
}
几个观察:
在
-objectWithString:error:中，error参数是一个指向指针的指针.在这种情况下，使用NULL而不是nil更为常见.not 传递NULL并使用NSError对象检查错误也是一个好主意，以防方法返回nil
In
-objectWithString:error:, theerrorparameter is a pointer to a pointer. It’s more common to useNULLinstead ofnilin that case. It’s also a good idea not to passNULLand use anNSErrorobject to inspect the error in case the method returnsnil
如果 jsonObject 仅用于该特定方法，您可能不需要复制它.上面的代码没有.
If jsonObject is used only in that particular method, you probably don’t need to copy it. The code above doesn’t.
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