rapidJson使用

 

/*!
* Email: guxuanqing@gmail.com
* Auth: xor
* Date: 2019-5-17
* File: vectorPtr.cpp
* Class: %{Cpp:License:ClassName} (if applicable)
* Brief:
* Note:
 */
#include <bits/stdc++.h>
#include <unistd.h>
#include "rapidjson/document.h"
#include "rapidjson/writer.h"
//#include "rapidjson/filestream.h"
#include "rapidjson/prettywriter.h"
#include "rapidjson/stringbuffer.h"

using namespace std;
using namespace rapidjson;

struct GENERALDATA{
    int m_data;
    char m_buf[16];
};

struct DATATEST{
    vector<GENERALDATA> vecData;
};

void vecToJsonFunc(void *req, void *rsp)
{
    DATATEST *dtest = static_cast<DATATEST *>(req);
    // rsp
    DATATEST *pRsp = static_cast<DATATEST *>(rsp);

    Document doc;
    doc.SetObject();
    Document::AllocatorType &allocator=doc.GetAllocator(); //获取分配器
    doc.AddMember("Auth", "xor",allocator);
    Value array1(kArrayType);
    for (int i=0;i<dtest->vecData.size();++i) {
        GENERALDATA &gend = dtest->vecData[i];
        Value object2(kObjectType);

        Value bufStr(kStringType);
        string iTostr = to_string(i+100);
        // allocator -> deep copy
        bufStr.SetString(iTostr.c_str(), iTostr.size(), allocator);
        object2.AddMember("buf", bufStr, allocator);

        Value InOne(kNumberType);
        InOne.SetInt(gend.m_data);
        object2.AddMember("mdata", InOne, allocator);
        array1.PushBack(object2, allocator);
    }
    doc.AddMember("Numbers", array1, allocator);

    StringBuffer buffer;
    PrettyWriter<StringBuffer> pretty_writer(buffer);  //PrettyWriter是格式化的json，如果是Writer则是换行空格压缩后的json
    doc.Accept(pretty_writer);

    cout<< "output composed buf:" << buffer.GetString()<<endl;


    // parse
    string readJsonStr = buffer.GetString();

    Document docParser;
    docParser.Parse(readJsonStr.c_str());

//    Value &author = docParser["Auth"];

    if(docParser.HasMember("Numbers") && docParser["Numbers"].IsArray())
    {
        const Value &ArrayObject = docParser["Numbers"];
        for (size_t i = 0; i < ArrayObject.Size(); ++i)
        {
            const Value &v = ArrayObject[i];
            GENERALDATA geneData;
            if (v.IsObject())
            {
                if (v.HasMember("mdata") && v["mdata"].IsInt())
                {
                    geneData.m_data = v["mdata"].GetInt();
                }
                if(v.HasMember("buf") && v["buf"].IsString())
                {
                    strncpy(geneData.m_buf, v["buf"].GetString(), sizeof (geneData.m_buf));
                }
            }
            pRsp->vecData.emplace_back(geneData);
        }
    }
    //abort
    if(docParser.HasMember("room") && docParser["room"].IsString())
    {
        cout << docParser["room"].GetString() << endl;
    }

    Value &author = docParser["Auth"];
    printf("I will sleep 10s\n");
    sleep(10);
    //system("pause");

}

int main(int argc,char **argv){

    DATATEST tst;
    for(int i=0;i<5;++i)
    {
        GENERALDATA dt;
        dt.m_data = i;
        tst.vecData.emplace_back(dt);
    }

    DATATEST tstRsp;
    vecToJsonFunc(&tst, &tstRsp);
    printf("hello world!\n");
    return 0;
}

 

上文json串

{
    "Auth": "xor",
    "Numbers": [
        {
            "buf": "100",
            "mdata": 0
        },
        {
            "buf": "101",
            "mdata": 1
        },
        {
            "buf": "102",
            "mdata": 2
        },
        {
            "buf": "103",
            "mdata": 3
        },
        {
            "buf": "104",
            "mdata": 4
        }
    ]
}