#include <iostream>#include <stdio.h>#include<unistd.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include<sstream>// 請自己下載開源的rapidjson#include "rapidjson/prettywriter.h"#include "rapidjson/rapidjson.h"#include "rapidjson/document.h"#include "rapidjson/stringbuffer.h"#include "rapidjson/writer.h"#include "rapidjson/memorystream.h"using namespace std;using rapidjson::Document;using rapidjson::StringBuffer;using rapidjson::Writer;using namespace rapidjson;string getStringFromJson(const string &jsStr, const string &strKey){ Document document; if (document.Parse(jsStr.c_str()).HasParseError() || !document.HasMember(strKey.c_str()))  { return ""; } const rapidjson::Value &jv = document[strKey.c_str()]; return jv.GetString();}int main(int argc, char *argv[]){ string s = "{/"code/":0,/"msg/":/"ok/"}"; cout << s << endl; cout << getStringFromJson(s, "msg") << endl; return 0;}