直接上代码

#include<iostream>
struct SystemDate{
    int nYear;
    int nMonth;
    int nDay;
}
void getJsonData(SystemDate &pCurDate)
{
    Json::CharReaderBuilder jsonBuilder;
    Json::Value root;
    unique_ptr<Json::CharReader> const reader(jsonBuilder.newCharReader());

    std::string strTime = "{\"Year\":2018,\"Month\":3,\"Day\":7}";
    jsonBuilder["colloectComments"] = false;
    JSONCPP_STRING errs;
    //将字符串写入到json变量中
    if (!reader->parse(strTime.c_str(),strTime.data() + strTime.size(),&root,&errs))
    {
        pCurDate.nYear = 0;
        pCurDate.nMonth = 0;
        pCurDate.nDay = 0;
        return;
    }
    cout << root << endl;
    pCurDate.nYear = root["Year"].asInt();
    pCurDate.nMonth = root["Month"].asInt();
    pCurDate.nDay = root["Day"].asInt();
}
int main()
{
    SystemDate date;
    getJsonDate(date);
    cout << date << endl;
}