jsoncpp的安装与使用示例

安装：

生成静态库

 1 生成静态库:
 2 第一步:生成目标文件:
 3 g++ -g -Wall -c json_reader.cpp json_value.cpp json_writer.cpp -I. -I../../include -lpthread
 4 
 5 会生成三个*.o文件
 6  json_reader.o
 7 json_value.o
 8 json_writer.o
 9 
10 第二步:生成静态库文件:
11 ar rcs libjsoncpp.a *.o
View Code

生成动态库:

g++ -g json_reader.cpp json_value.cpp json_writer.cpp -fPIC -Wall -shared -o libjsoncpp.so -I. -I../../include -lpthread

记得引用时:

1.指定库文件:比如将生成的 libjsoncpp.so和libjsoncpp.a库文件放到/usr/local/lib/jsoncpp-src-0.5.0/下面.

2.指定头文件位置:比如,将jsoncpp-src-0.5.0/include/下的头文件放到/usr/local/include/jsoncpp-src-0.5.0/下面.

 

 实用示例：

 1 #include <iostream>
 2 #include <fstream>
 3 
 4 //#include </usr/local/include/jsoncpp0.5.0/json/json.h>
 5 //#include <json/json.h>
 6 #include <json/json.h>
 7 using namespace std;
 8 
 9 int main()
10 {
11     //根节点
12     Json::Value root;
13 
14     //根节点属性
15     root["name"] = Json::Value("Tsybius");
16     root["age"] = Json::Value(23);
17     root["sex_is_male"] = Json::Value(true);
18 
19     //子节点
20     Json::Value partner;
21 
22     //子节点属性
23     partner["partner_name"] = Json::Value("Galatea");
24     partner["partner_age"] = Json::Value(21);
25     partner["partner_sex_is_male"] = Json::Value(false);
26 
27     //子节点挂到根节点上
28     root["partner"] = Json::Value(partner);
29 
30     //数组形式
31     root["achievement"].append("ach1");
32     root["achievement"].append("ach2");
33     root["achievement"].append("ach3");
34 
35     //直接输出
36     cout << "FastWriter:" << endl;
37     Json::FastWriter fw;
38     cout << fw.write(root) << endl << endl;
39 
40     //缩进输出
41     cout << "StyledWriter:" << endl;
42     Json::StyledWriter sw;
43     cout << sw.write(root) << endl << endl;
44 
45     //输出到文件
46     ofstream os;
47     os.open("./PersonalInfo.js");
48     os << sw.write(root);
49     os.close();
50 
51     return 0;
52 }
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output:

FastWriter:
{"achievement":["ach1","ach2","ach3"],"age":23,"name":"Tsybius","partner":{"partner_age":21,"partner_name":"Galatea","partner_sex_is_male":false},"sex_is_male":true}


StyledWriter:
{
   "achievement" : [ "ach1", "ach2", "ach3" ],
   "age" : 23,
   "name" : "Tsybius",
   "partner" : {
      "partner_age" : 21,
      "partner_name" : "Galatea",
      "partner_sex_is_male" : false
   },
   "sex_is_male" : true
}

 

 1 #include <bits/stdc++.h>
 2 //#include <json/json.h>
 3 #include </usr/include/jsoncpp/json/json.h>
 4 void readJson();
 5 void writeJson();
 6 
 7 int main(int argc, char **argv)
 8 {
 9     readJson();
10     writeJson();
11     return 0;
12 }
13 
14 void readJson()
15 {
16     using namespace std;
17     std::string strValue =
18         "{\"name\":\"json\",\"array\":[{\"cpp\":\"jsoncpp\"},{\"java\":\"jsoninjava\"},{\"php\":\"support\"}]}";
19 
20     Json::Reader reader;
21     Json::Value value;
22 
23     if (reader.parse(strValue, value)) {
24         std::string out = value["name"].asString();
25         std::cout << out << std::endl;
26         const Json::Value arrayObj = value["array"];
27         for (unsigned int i = 0; i < arrayObj.size(); i++) {
28             if (!arrayObj[i].isMember("cpp"))
29                 continue;
30             out = arrayObj[i]["cpp"].asString();
31             std::cout << out;
32             if (i != (arrayObj.size() - 1))
33                 std::cout << std::endl;
34         }
35     }
36 }
37 
38 void writeJson()
39 {
40     using namespace std;
41 
42     Json::Value root;
43     Json::Value arrayObj;
44     Json::Value item;
45 
46     item["cpp"] = "jsoncpp";
47     item["java"] = "jsoninjava";
48     item["php"] = "support";
49     arrayObj.append(item);
50 
51     root["name"] = "json";
52     root["array"] = arrayObj;
53 
54     root.toStyledString();
55     std::string out = root.toStyledString();
56     std::cout << out << std::endl;
57 }
View Code
 1 json
 2 jsoncpp
 3 {
 4    "array" : [
 5       {
 6          "cpp" : "jsoncpp",
 7          "java" : "jsoninjava",
 8          "php" : "support"
 9       }
10    ],
11    "name" : "json"
12 }

 

posted @ 2017-09-13 08:59  PKICA  阅读(2275)  评论(0)  编辑  收藏  举报