How to get JsonCPP values as strings?

Question

I am parsing json data using JsonCpp. I don't really need to understand the data, i just need to print out some properties and their values out. It somehow is hard to do. First I need to know what type the value is and then get the value and then convert it to string again! There is a styled writer but I don't want to use it as it appends some CRLF at the end.

I do something like this

CJsonHelper::getUInt(Json::Value &root, std::string key){
    return root.get(key, 0-1).isInt() ? root.get(key, 0-1).asUInt() : 0-1;
}

Could I just write a single function to get all the properties with just that function which doesn't really care about the types etc?

Why are you using 0-1 instead of just -1?

Some programmer dude
– Some programmer dude

2012-01-13 06:50:50 +00:00
Commented Jan 13, 2012 at 6:50 — Some programmer dude
– Some programmer dude, Commented Jan 13, 2012 at 6:50

cdunn2001 · Accepted Answer · 2015-02-17 00:01:45Z

13

The project has moved to GitHub.

To avoid all linefeeds, use a StreamWriterBuilder:

Json::Value whatever = ...;
Json::StreamWriterBuilder builder;
builder.settings_["indentation"] = "";
std::string out = Json::writeString(builder, whatever);

answered Feb 17, 2015 at 0:01

cdunn2001

18.5k8 gold badges58 silver badges46 bronze badges

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

Comments

David Schwartz · Accepted Answer · 2012-01-13 02:04:40Z

1

You can trivially create your own writer that does whatever you want. Have look at the code for StyledWriter. The CRLF's you don't like come from StyledWriter::Write. You can create your own writer class that doesn't have those CRLF's.

If you don't mind modifying the library, change the writer so that functions like writeValue are protected rather than private. Then you can derive your own class from StyledWriter with a different Write function and still use the various write* functions to do the details of the conversion.

answered Jan 13, 2012 at 2:04

David Schwartz

184k18 gold badges229 silver badges293 bronze badges

Collectives™ on Stack Overflow

How to get JsonCPP values as strings?

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related