Json-5.0

另可参考https://www.cnblogs.com/yelongsan/p/4134384.html 

  1 #include <string>
  2 #include <json/json.h>
  3 #include <stdio.h>
  4 #include <fstream>
  5 using namespace std;
  6 
  7 void readStrJson(); //从字符串中读取JSON
  8 void readStrProJson(); //从字符串中读取JSON（内容复杂些）
  9 
 10 int main(int argc, char *argv[])
 11 {
 12     readStrJson();
 13 
 14     cout << "\n\n";
 15     readStrProJson();
 16     system("pause");
 17     return 0;
 18 }
 19 
 20 //从字符串中读取JSON
 21 void readStrJson()
 22 {
 23     //字符串
 24     const char* str =
 25         "{\"praenomen\":\"Gaius\",\"nomen\":\"Julius\",\"cognomen\":\"Caezar\","
 26         "\"born\":-100,\"died\":-44}";
 27 
 28     /*
 29     //json内容如下：
 30     {
 31           "praenomen":"Gaius",
 32           "nomen":"Julius",
 33           "cognomen":"Caezar",
 34           "born":-100,
 35           "died":-44
 36       }
 37     */
 38 
 39     Json::Reader reader;
 40     Json::Value root;
 41 
 42     //从字符串中读取数据
 43     if (reader.parse(str, root))
 44     {
 45         string praenomen = root["praenomen"].asString();
 46         string nomen = root["nomen"].asString();
 47         string cognomen = root["cognomen"].asString();
 48         int born = root["born"].asInt();
 49         int died = root["died"].asInt();
 50 
 51         cout << praenomen + " " + nomen + " " + cognomen
 52             << " was born in year " << born
 53             << ", died in year " << died << endl;
 54     }
 55 
 56 }
 57 
 58 //从字符串中读取JSON（内容复杂些）
 59 void readStrProJson()
 60 {
 61     string strValue = "{\"name\":\"json\",\"array\":[{\"cpp\":\"jsoncpp\"},{\"java\":\"jsoninjava\"},{\"php\":\"support\"}]}";//1，3
 62     /*
 63     //json内容如下：
 64     {
 65     "name": "json″,
 66     "array": [               //【一个数组】
 67         {
 68             "cpp": "jsoncpp"
 69         },
 70         {
 71             "java": "jsoninjava"
 72         },
 73         {
 74             "php": "support"
 75         }
 76     ]
 77     }
 78     */
 79 
 80 
 81     Json::Reader reader;
 82     Json::Value value;
 83 
 84     if (reader.parse(strValue, value))
 85     {
 86         string out = value["name"].asString();
 87         cout << out << endl;
 88         const Json::Value arrayObj = value["array"];
 89         for (unsigned int i = 0; i < arrayObj.size(); i++)
 90         {
 91             if (!arrayObj[i].isMember("cpp"))
 92                 continue;
 93             out = arrayObj[i]["cpp"].asString();
 94             cout << out;
 95             if (i != (arrayObj.size() - 1))
 96                 cout << endl;
 97         }
 98     }
 99 }
100

 

posted @ 2019-12-29 01:12  Parallax  阅读(108)  评论(0)  编辑  收藏  举报