JSONCPP

Code

trans.json

{
    "node": "IAS",
    "name": "PeoCountingCfg",
    "srcCfg": {
        "vmInfo": {
            "vmAddr": "192.168.0.1",
            "vmUser": "loadmin",
            "vmPasswd": "-42-49-66-1-242-227-212-197-182-238-222"
        },
        "camCode": "cam1"
    },
    "rule": {
        "points": [
            {
                "point": [
                    100,
                    100
                ]
            },
            {
                "point": [
                    100,
                    200
                ]
            }
        ],
        "direction": [
            {
                "pointStart": [
                    100,
                    100
                ]
            },
            {
                "pointEnd": [
                    200,
                    100
                ]
            }
        ],
        "peopleCalib": [
            {
                "headY": 20,
                "footY": 40
            },
            {
                "headY": 80,
                "footY": 120
            },
            {
                "headY": 150,
                "footY": 220
            }
        ],
        "number": {
            "up": 20,
            "down": 10
        },
        "factor": {
            "up": 1.25,
            "down": 0.76
        }
    }
}

video.json

{
   "array" : {
      "age" : 18,
      "array1" : [
         {
            "key" : 0
         },
         {
            "key" : 1
         },
         {
            "key" : 2
         },
         {
            "key" : 3
         },
         {
            "key" : 4
         },
         {
            "key" : 5
         },
         {
            "key" : 6
         },
         {
            "key" : 7
         },
         {
            "key" : 8
         },
         {
            "key" : 9
         }
      ],
      "map" : [
         {
            "arrayMap" : "zengraoli"
         },
         {
            "arrayMap" : "zengraoli"
         },
         {
            "arrayMap" : "zengraoli"
         },
         {
            "arrayMap" : "zengraoli"
         },
         {
            "arrayMap" : "zengraoli"
         },
         {
            "arrayMap" : "zengraoli"
         },
         {
            "arrayMap" : "zengraoli"
         },
         {
            "arrayMap" : "zengraoli"
         },
         {
            "arrayMap" : "zengraoli"
         },
         {
            "arrayMap" : "zengraoli"
         }
      ]
   }
}

#include "iostream"
#include "string"
#include "json/json.h"
#include "fstream"
#include "assert.h"
using namespace std;
int ReadFromFile(const string& fileName)
{
    ifstream fin;
    fin.open(fileName.c_str());
    assert(fin.is_open());
    Json::Reader reader;
    Json::Value  root;
    if (!reader.parse(fin, root, false))
    {
        printf("Read Json Error");
        return -1;
    }
    // 获取数组中的数据
    cout << "array data：" << endl;
    int arraySize = root["array"]["map"].size();
    for (int i = 0; i <arraySize; i++)
    {
        Json::Value valKeyValue = root["array"]["map"][i]["arrayMap"];
        string tempKeyValue = valKeyValue.asString();
        cout << "array map arrayMap：" << tempKeyValue << endl;
    }
    cout << endl;
    cout << "my age is：" << root["array"]["age"] << endl;
    int arraySize2 = root["array"]["array1"].size();
    for (int i = 0; i <arraySize2; i++)
    {
        Json::Value valKeyValue = root["array"]["array1"][i]["key"];
        int tempKeyValue = valKeyValue.asInt();
        cout << "tempKeyValue：" << tempKeyValue << endl;
    }
}
int WriteToFile(const string& fileName)
{
    ofstream fout;
    fout.open(fileName.c_str());
    assert(fout.is_open());
    Json::Value root;
    Json::Value arrayObj;
    Json::Value item;
    Json::Value arrayMap;
    for (int i = 0; i < 10; i++)
    {
        item["arrayMap"] = "zengraoli";
        arrayMap.append(item);
    }
    root["array"]["map"]= arrayMap;
    root["array"]["age"] = 18;
    Json::Value item2;
    for (int i = 0; i < 10; i++)
    {
        item2["key"] = i;
        arrayObj.append(item2);
    }
    root["array"]["array1"] = arrayObj;
    std::string out = root.toStyledString();
    fout << root.toStyledString() << endl;
    return 0;
}
int main(int argc, char* argv[])
{
    //WriteToFile("video.json");
    ReadFromFile("trans.json");
    return 0;
}