Fetch key value from JSON string C++ RapidJson

Asked Jul 21 '16 at 18:00

Active Jul 22 '16 at 21:04

Viewed 563 times

I have the following stored in a string. I want to fetch the value of "errorType" from this. How can I do that using RapidJson?

{
"id": "9a1eaff0-5339-49ff-86cb-9c76809b3d48",
"timestamp": "2016-07-21T16:11:27.995Z",
"result": {
"source": "agent",
"resolvedQuery": "current time",
"contexts": [],
"metadata": {},
"fulfillment": {
  "speech": ""
},
"score": 0.0
},
"status": {
"code": 200,
"errorType": "success"
},
"asr": {
"current time": 0.9035825
},
"sessionId": "1234567890"
}

I tried using this code, but it didn't work:

const std::string s = json;

regex rgx(".*\"errorType\":\s\"(\\w+)\".*");
smatch match;

if (std::regex_search(s.begin(), s.end(), match, rgx))
    printf("Value of errortype is : %s\n", match[1]);

It's not printing any value since it didn't work.

How can I fix this problem?

I want to avoid using any JSON parser. But I am flexible with my implementation.

edited Jul 22 '16 at 21:04

Peter Mortensen

30,738
21
105
131

asked Jul 21 '16 at 18:00

RDoonds

2

why not use jsoncpp for JSON parsing? https://github.com/open-source-parsers/jsoncpp – gabbar0x Jul 21 '16 at 18:02
2

I would not use regex to parse JSON. I have a felling you will run into [issue like you do with HTML](http://stackoverflow.com/a/1732454/4342498). – NathanOliver Jul 21 '16 at 18:06
Can you help me with using json parser. Which is easy to use? And with example if available – RDoonds Jul 21 '16 at 18:08
@RDoonds: An actual JSON parser will be easier to use than writing something for yourself. – Nicol Bolas Jul 22 '16 at 21:08

Fetch key value from JSON string C++ RapidJson

0 Answers0