在新的Jsoncpp中 Json::Writer
、Json::FastWriter
、Json::Reader
等都被摒弃了,
用了新的Json::StreamWriterBuilder
、Json::CharReaderBuilder
代替。
示例代码如下:
#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include "json/json.h"
std::string createJson()
{
std::string jsonStr;
Json::Value root, lang, mail;
Json::StreamWriterBuilder writerBuilder;
std::ostringstream os;
root["Name"] = "monk";
root["Age"] = 30;
lang[0] = "C++";
lang[1] = "Java";
lang[2] = "Python";
root["Language"] = lang;
mail["Netease"] = "[email protected]";
mail["Hotmail"] = "[email protected]";
root["E-mail"] = mail;
std::unique_ptr<Json::StreamWriter> jsonWriter(writerBuilder.newStreamWriter());
jsonWriter->write(root, &os);
jsonStr = os.str();
std::cout << "Json:\n" << jsonStr << std::endl;
return jsonStr;
}
bool parseJson(const std::string& info)
{
if(info.empty()){
return false;
}
bool res;
JSONCPP_STRING errs;
Json::Value root, lang, mail;
Json::CharReaderBuilder readerBuilder;
std::unique_ptr<Json::CharReader> const jsonReader(readerBuilder.newCharReader());
res = jsonReader->parse(info.c_str(), info.c_str() + info.length(), &root, &errs);
if(!res || !errs.empty()){
std::cout << "parseJson err. " << errs << std::endl;
}
std::cout << "Name: " << root["Name"].asString() << std::endl;
std::cout << "Age: " << root["Age"].asInt() << std::endl;
lang = root["Language"];
std::cout << "Language: ";
for (int i = 0; i < lang.size(); ++i) {
std::cout << lang[i] << " ";
}
std::cout << std::endl;
mail = root["E-mail"];
std::cout << "Netease: " << mail["Netease"].asString() << std::endl;
std::cout << "Hotmail: " << mail["Hotmail"].asString() << std::endl;
return true;
}
void json_test1()
{
std::string json_str = createJson();
parseJson(json_str);
}
int main(int argc, char **argv)
{
json_test1();
return 0;
}