【003：jsoncpp的简单使用】

#include <json/json.h>
#include <iostream>
#include <string>
using namespace std;

int main(){
    Json::Value root;
    Json::FastWriter writer;

    int a  = 123;
    int b  = 456;
    int c = 5858;
    int d = 4;


    root["mprotocolType"] = a;
    root["dstdeviceID"] =  b;
    root["mprotocolID"] =  c;
    root["mver"] = d;

   string receiveDataToRedis = writer.write(root);

    cout << "data:  " << receiveDataToRedis << endl;


    return 0;

}

编译：

　　# g++ test.cpp -I/usr/local/include /usr/local/lib/-ljson_linux-gcc-4.4.5_libmt.a

运行：

　　#./a.out 

输出;

　　data:  {"dstdeviceID":456,"mprotocolID":5858,"mprotocolType":123,"mver":4}

       可以发现，jsoncpp的字段排序默认是按照字母的。