无法从 JSON 响应中获取正确的字符串？

Question

Why can't I get the correct string from a JSON response?

From the app I do a PHP call and get following JSON data back:

{"success":1, "session_id":"778a6a66505b785e1130c46227d44641"}

But when I read it in the app the session_id is 140407621032752. Why?

Here is a little bit of my code:

let responseData:NSString  = NSString(data:urlData!, encoding:NSUTF8StringEncoding)!

NSLog("Response ==> %@", responseData);

let jsonData:NSDictionary = try NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers ) as! NSDictionary
                        let success:NSInteger = jsonData.valueForKey("success") as! NSInteger
let sessionId:NSString = jsonData.valueForKey("session_id") as! NSString

NSLog("Success: %ld", success)
NSLog("sessionId: %ld", sessionId)

And here is output when running it:

2016-05-03 14:15:06.826 ran[10974:4371080] Response code: 200
2016-05-03 14:15:06.826 ran[10974:4371080] Response ==> {"success":1, "session_id":"778a6a66505b785e1130c46227d44641"}
2016-05-03 14:15:06.826 ran[10974:4371080] Success: 1
2016-05-03 14:15:06.826 ran[10974:4371080] sessionId: 140407621032752

As you can see session_id is coming in correct. But how can I get it?

Answer 1

您的会话 ID 是一个字符串，因此您必须使用字符串格式化程序%@来处理 NSLog：

NSLog("sessionId: %@", sessionId)