jsoncpp/example/readFromStream/readFromStream.cpp

#include "json/json.h"
#include <fstream>
#include <iostream>
/** \brief Parse from stream, collect comments and capture error info.
 * Example Usage:
 * $g++ readFromStream.cpp -ljsoncpp -std=c++11 -o readFromStream
 * $./readFromStream
 * // comment head
 * {
 *    // comment before
 *    "key" : "value"
 * }
 * // comment after
 * // comment tail
 */
int main(int argc, char* argv[]) {
  Json::Value root;
  std::ifstream ifs;
  ifs.open(argv[1]);

  Json::CharReaderBuilder builder;
  builder["collectComments"] = true;
  JSONCPP_STRING errs;
  if (!parseFromStream(builder, ifs, &root, &errs)) {
    std::cout << errs << std::endl;
    return EXIT_FAILURE;
  }
  std::cout << root << std::endl;
  return EXIT_SUCCESS;
}