【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  = ;
     int b  = ;
     int c = ;
     int d = ;

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

    string receiveDataToRedis = writer.write(root);

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

     return ;

 }

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。