rapidjson使用

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官方文档：http://rapidjson.org/zh-cn/index.html

纯头文件，不需要安装，拷贝rapidjson到项目，然后include它

读取

include

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#include "lib/rapidjson/document.h"
#include "lib/rapidjson/writer.h"
#include "lib/rapidjson/stringbuffer.h"
#include "lib/rapidjson/filereadstream.h"

读取文件并解析

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FILE* fp = fopen(config_file.c_str(), "r");
    char readBuffer[65536];
    rapidjson::FileReadStream is(fp, readBuffer, sizeof(readBuffer));
    rapidjson::Document d;
    d.ParseStream(is);
    rapidjson::Value& s = d[cameraID.c_str()];
    list<std::array<int, 4>> boxesList;
    for (auto& v : s.GetArray()) {
        std::array<int, 4> boxArray;
        string box = v.GetString();
    }

写入

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rapidjson::StringBuffer s;
rapidjson::Writer<rapidjson::StringBuffer> writer(s);
writer.StartObject();
writer.Key("detID");
writer.String(m_videoInfo.stream_id.c_str());
writer.Key("vehicleInfor");
writer.StartArray();
for (auto box:boxes){
    writer.StartObject();
    writer.Key("x1");
    writer.Double(box.x);
    writer.Key("y1");
    writer.Double(box.y);
    writer.Key("x2");
    writer.Double(box.x + box.w);
    writer.Key("y2");
    writer.Double(box.y + box.h);
    writer.EndObject();
}
writer.EndArray();
writer.EndObject();