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
请注意，您的 JSON 数据具有以下结构:
Note that your JSON data has the following structure:
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:, the error parameter is a pointer to a pointer. It’s more common to use NULL instead of nil in that case. It’s also a good idea not to pass NULL and use an NSError object to inspect the error in case the method returns nil
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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