使用C++和rapidjson处理JSON信息

#include "rapidjson/document.h"
#include <iostream>

int main() {
    const char* json = "{\"project\":\"rapidjson\",\"stars\":10}";
    rapidjson::Document d;
    d.Parse(json);

    if (d.HasParseError()) {
        std::cout << "Error parsing JSON" << std::endl;
        return 1;
    }

    if (d.HasMember("project") && d["project"].IsString()) {
        std::cout << "Project: " << d["project"].GetString() << std::endl;
    }

    if (d.HasMember("stars") && d["stars"].IsInt()) {
        std::cout << "Stars: " << d["stars"].GetInt() << std::endl;
    }

    return 0;
}

#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"
#include <iostream>

int main() {
    rapidjson::StringBuffer s;
    rapidjson::Writer<rapidjson::StringBuffer> writer(s);

    writer.StartObject();
    writer.String("project"); writer.String("rapidjson");
    writer.String("stars"); writer.Int(10);
    writer.EndObject();

    std::cout << s.GetString() << std::endl;

    return 0;
}

#include "rapidjson/reader.h"
#include "rapidjson/filereadstream.h"
#include <fstream>

using namespace rapidjson;

struct MyHandler {
    bool StartObject() { return true; }
    bool EndObject() { return true; }
    bool StartArray() { return true; }
    bool EndArray() { return true; }
    bool Key(const char* str, SizeType length, bool copy) { return true; }
    bool String(const char* str, SizeType length, bool copy) { return true; }
    bool Int(int i) { return true; }
    bool Uint(unsigned u) { return true; }
    bool Int64(int64_t i) { return true; }
    bool Uint64(uint64_t u) { return true; }
    bool Double(double d) { return true; }
    bool Bool(bool b) { return true; }
    bool Null() { return true; }
};

int main() {
    FILE* fp = fopen("large.json", "rb");
    if (!fp) {
        std::cout << "Error opening file" << std::endl;
        return 1;
    }

    char readBuffer[65536];
    FileReadStream is(fp, readBuffer, sizeof(readBuffer));
    MyHandler handler;
    Reader reader;
    reader.Parse(is, handler);

    fclose(fp);
    return 0;
}