json::rapidjson工具 | 易学教程

源码地址： https://github.com/Tencent/rapidjson 可跨平台使用。将 rapidjson-master\include\rapidjson 中的 rapidjson 文件夹添加到 项目中 即可。

#pragma once
#include <type_traits>
#include <rapidjson/error/en.h>
#include <rapidjson/document.h>
#include <rapidjson/stringbuffer.h>
#include <rapidjson/prettywriter.h>
#include <rapidjson/reader.h>
#include <rapidjson/error/en.h>

template<typename T>
bool safe_get_json_member(rapidjson::Value& v, const char* field, T& r)
{
    if (!v.HasMember(field))
        return false;

    return safe_get_json_val(v[field], r);
}

std::string Json2str()
{
    std::lock_guard<mutex> lck(m_mx);
    Document doc;
    doc.SetObject();

    Document::AllocatorType& allocator = doc.GetAllocator();

    Value base(rapidjson::kObjectType);
    
    base.AddMember("SnapPicturePath", StringRef(m_bc.SnapPicturePath.c_str()), allocator);
    base.AddMember("vehThreadNum", StringRef(m_bc.vehThreadNum.c_str()), allocator);
    base.AddMember("vehUrl", StringRef(m_bc.vehUrl.c_str()), allocator);
    base.AddMember("cmsUrl", StringRef(m_bc.cmsUrl.c_str()), allocator);
    
    doc.AddMember("base", base, allocator);
    rapidjson::StringBuffer buffer;
    rapidjson::PrettyWriter<rapidjson::StringBuffer> writer(buffer);
    doc.Accept(writer);

    return buffer.GetString();
}

std::string str2json(string str)
{    Document doc;

    doc.Parse<0>(str.c_str());
    if (doc.HasParseError()) {
        return false;
    }

    Value* pValue = nullptr;
    Value* Value = nullptr;
    safe_get_json_member(doc, "result", pValue);

    if(safe_get_json_member(*pValue, "image", Value))
    　　outHexImage = Value->GetString();
    if(safe_get_json_member(*pValue, "confidence", Value))
    　　confidence = Value->GetString(); }

来源：https://www.cnblogs.com/osbreak/p/11376956.html

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rapidjson