C++ 解析json串

#include "stdafx.h"
#include "../json/include/json.h"

int _tmain(int argc, _TCHAR* argv[])
{
    const char * str = "{\"machineCode\":\"20:20:20:20:20:20:57:4c:31:30:59:31:4d:56\",\"makeTime\":1534485879,\"sysCapacity\":{\"rptMaxNum\":2},\"trialTime\":30}";
    printf("json 串：%s\n", str);

    Json::Reader reader;
    Json::Value  root;
    if(reader.parse(str,root))
    {
        std::string machineCode = root["machineCode"].asString();
        long long makeTime  = root["makeTime"].asUInt();
        int rptMaxNum = root["rptMaxNum"].asInt();
        int trialTime = root["trialTime"].asInt();

        printf("解析json串之后的值：\n");
        printf("machineCode = %s\n",machineCode.c_str());
        printf("makeTime = %ld\n",makeTime);
        printf("rptMaxNum = %d\n",rptMaxNum);
        printf("trialTIme = %d\n",trialTime);

        Json::Value  & sysCapacity = root["sysCapacity"];
        int rpt = sysCapacity["rptMaxNum"].asInt();
        printf("rptMaxNum = %d\n",rpt);
    }
    system("pause");
    return 0;
}