How can I parse JSON arrays with C++ Boost? How can I parse JSON arrays with C++ Boost? json json

How can I parse JSON arrays with C++ Boost?


Use the iterators, Luke.

First , you have to parse the file:

boost::property_tree::ptree doc;boost::property_tree::read_json("input_file.json", doc);

... now, because it seems you have multiple "frame" keys in the top level dictionary you must iterate over them:

BOOST_FOREACH (boost::property_tree::ptree::value_type& framePair, doc) {    // Now framePair.first == "frame" and framePair.second is the subtree frame dictionary} 

Iterating over the rows and columns is the same:

BOOST_FOREACH (boost::property_tree::ptree::value_type& rowPair, frame.get_child("points")) {    // rowPair.first == ""    BOOST_FOREACH (boost::property_tree::ptree::value_type& itemPair, rowPair.second) {        cout << itemPair.second.get_value<std::string>() << " ";    }    cout << endl;}

I didn't test the code, but the idea will work :-)