JsonCpp - when having a json::Value object, how can i know it's key name?

c++ json jsoncpp

Rong · Dec 10, 2013 · Viewed 16.1k times · Source

Let suppose I have this Json file:

[
    {
        "id": 0
    }
]

using jsoncpp, i can have a Json::Value object by doing this:

Json::Value node = root[0u]["id"];

OK, somewhere else in the code, I'm getting that node object, and I want to get some info out of it. I can get its value, like this:

int node_value = node.asInt();

But how can I get its NAME? (i.e the "id"). It should be something like:

string node_name  = node.Name(); //or maybe:
string node_name2 = node.Key();

but I can't find anything similar. Help? How can I get a node's name?

Answer

You can use Json::Value::getMemberNames() to iterate through the names.

Json::Value value;
for (auto const& id : value.getMemberNames()) {
    std::cout << id << std::endl;
}