cpp的json的用法举例

#include "json/json.h"
#include <string>
#include <iostream>
#include <fstream>
using namespace std;
const string movie =
"电影";
const string cartoon =
"动漫";
const string tvplay =
"电视";
const string variety =
"综艺";
void getValue(string key, string property, Json::Value value){
    Json::Value arrayObj = value[key.c_str()];
    if(arrayObj.size() !=
0){
        for (unsigned
int i = 0; i < arrayObj.size(); i++)
        { 
            string tmp = arrayObj[i][property.c_str()].asString();
            std::cout << tmp << "\t";
        } 
        std::cout << std::endl;
    }
}
void printHelp(){
    cout << "a.out movie|cartoon|tvplay|variety" << endl;
}
int main(int argc,
char* argv[])
{
    if(argc !=
2){
        cerr << "param count is "<< argc << endl;
        printHelp();
        return -1;
    }

    string query = argv[1];
    if(query.compare("movie") !=
0 && query.compare("cartoon") !=
0 &&
            query.compare("tvplay") !=
0 && query.compare("variety") !=
0
      ){
        cerr << "second param is "<< argv[1] << endl;
        printHelp();
        return -1;
    }
    if(query.compare("movie") ==
0)     query = "电影";
    if(query.compare("cartoon") ==
0)   query = "动漫";
    if(query.compare("tvplay") ==
0)    query = "电视";
    if(query.compare("variety") ==
0)   query = "综艺";

    Json::Reader reader;
    Json::Value value;
    string file_name = "total.dat"; 
    ifstream infile(file_name.c_str(),ios::in);
    string textline; 
    bool needInfo =
false;
    int count_line =
0;
    int count_query =
0;

    while(getline(infile, textline,
'\n')){
        needInfo = false;
        count_line++;
        if(reader.parse(textline, value)){
            Json::Value arrayObj = value["domain"];
            for (unsigned
int i = 0; i < arrayObj.size(); i++){ 
                string domain = arrayObj[i]["@value"].asString();
                if (domain.compare(query) ==
0) {
                    needInfo = true;
                    break;
                }
            } 

            if(needInfo ==
true){
                getValue("@uri",
"@value", value);
            }
        }
    }
    return
0;
}