rapidjson parses json code instances and common json core dump problems

rapidjson parses json code instances

Look directly at the code:

#include <iostream>
#include <stdio.h>
#include<unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include<sstream>
//  Please download the open source one yourself 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;
}

Results:

{"code":0,"msg":"ok"}
ok

Note:

1. If not document.Parse(jsStr.c_str()).HasParseError() core dump

2. If not !document.HasMember(strKey.c_str()) core dump

3. code is 0 and is an integer. If the above getStringFromJson is called, core dump will be used return jv.GetInt();

Life is short. I love rapidjson

conclusion