jsoncpp write json array with only one element

Question

I have a problem in using jsoncpp. Code is below:

Json::Value content;
for ( int i=0; i < len; ++i)
{
    content["res"].append(strs[i]);
}

My case is, when my string vector strs only have one element, the final json string are like:

"res":"a"

However, I'm expecting something like:

"res":["a"]

I hope anyone pull me out, thanks guys!!!

dani2442 · Accepted Answer · 2018-07-10 12:04:34Z

3

You have to initialize content as an array doing this:

Json::Value content(Json::arrayValue);

edited Jul 10, 2018 at 12:04

answered Jul 10, 2018 at 11:01

dani2442

517 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

James · Accepted Answer · 2018-07-11 06:17:31Z

2

Problem Solved! Thanks for the help from both @dani2442 and @stetoc

I run a little test with code below:

Json::Value root, content(Json::arrayValue);
content.append("a");
root["res"]=content;
cout << root.toStyledString() <<endl;

the result is :

{
    "res" : [ "a" ]
}

answered Jul 11, 2018 at 6:17

James

451 silver badge6 bronze badges

Comments

bestestefan · Accepted Answer · 2018-07-10 10:43:03Z

0

afaik content should be defined as Json::arrayValue instead of content

answered Jul 10, 2018 at 10:43

bestestefan

8716 silver badges23 bronze badges

2 Comments

bestestefan Over a year ago

why not? if he declares variable as Json::arrayValue then his function will work properly

ElmoVanKielmo Over a year ago

@stetoc your answer forced me to read a lot on meta on the topic of low quality answer and not an answer identification. While I still have my opinion that your answer could be improved, I revoked not an answer flag and admit my mistake. It's a topic discussed widely and coming back like a boomerang but the majority of experienced SO users seem to consider answers similar to yours to be valid answers. They still recommend editing and improving these answers.

Collectives™ on Stack Overflow

jsoncpp write json array with only one element

3 Answers 3

Comments

Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related