jso cpp解析读写数据

json write :
{
   "array" : [
      {
         "aaaaaa" : "bbbbbb",
         "number" : 999,
         "string" : "this is a string"
      }
   ],
   "arrnum" : [ null, 1, 2, 3, 4, 5, 6 ],
   "name" : "json",
   "number" : 666,
   "value" : true
}

写数据：

std::string writeJson()
  {
      using namespace std;

      Json::Value root;
      Json::Value arrayObj;
      Json::Value item;
      Json::Value iNum;

      item["string"]    = "this is a string";
      item["number"]    = ;
      item["aaaaaa"]    = "bbbbbb";
      arrayObj.append(item);

      //直接对jsoncpp对象以数字索引作为下标进行赋值，则自动作为数组
      iNum[] = ;
      iNum[] = ;
      iNum[] = ;
      iNum[] = ;
      iNum[] = ;
      iNum[] = ;

      //增加对象数组
      root["array"]    = arrayObj;
      //增加字符串
      root["name"]    = "json";
      //增加数字
      root["number"]    = ;
      //增加布尔变量
      root["value"]    = true;
      //增加数字数组
     root["arrnum"]    = iNum;

     root.toStyledString();
     string out = root.toStyledString();

     return out;
 }

读数据：

json write :
{
   "array" : [
      {
         "aaaaaa" : "bbbbbb",
         "number" : 999,
         "string" : "this is a string"
      }
   ],
   "arrnum" : [ null, 1, 2, 3, 4, 5, 6 ],
   "name" : "json",
   "number" : 666,
   "value" : true
}

int ReadJson(const std::string & strValue)
  {
      using namespace std;

      Json::Reader reader;
      Json::Value value;

      if (reader.parse(strValue, value))
      {
          //解析json中的对象
          string out = value["name"].asString();
          cout << "name : "   << out << endl;
          cout << "number : " << value["number"].asInt() << endl;
          cout << "value : "  << value["value"].asBool() << endl;
          cout << "no such num : " << value["haha"].asInt() << endl;
          cout << "no such str : " << value["hehe"].asString() << endl;

          //解析数组对象
          const Json::Value arrayNum = value["arrnum"];
          for (unsigned int i = ; i < arrayNum.size(); i++)
          {
              cout << "arrnum[" << i << "] = " << arrayNum[i];
          }
          //解析对象数组对象
          Json::Value arrayObj = value["array"];
          cout << "array size = " << arrayObj.size() << endl;
          for(unsigned int i = ; i < arrayObj.size(); i++)
          {
              cout << arrayObj[i];
          }
          //从对象数组中找到想要的对象
          for(unsigned int i = ; i < arrayObj.size(); i++)
          {
              if (arrayObj[i].isMember("string"))
              {
                  out = arrayObj[i]["string"].asString();
                  std::cout << "string : " << out << std::endl;
              }
          }
      }

      return ;
  }

json read :
name : json
number : 666
value : 1
no such num : 0
no such str :
arrnum[0] = null
arrnum[1] = 1
arrnum[2] = 2
arrnum[3] = 3
arrnum[4] = 4
arrnum[5] = 5
arrnum[6] = 6
array size = 1

{
    "aaaaaa" : "bbbbbb",
    "number" : 999,
    "string" : "this is a string"
}