C++使用Boost 解析Json

雨点打透心脏的1/2处 2022-05-15 15:52 856阅读 0赞

1.下载Boost库。

2.建立控制台项目。

3.配置Boost路径。

项目属性 -  C/C++ - 常规 - 附加包含目录 - 添加Boost库的路径。

4.代码实例

#include <boost/property_tree/ptree.hpp>
    #include <boost/property_tree/json_parser.hpp>
    #include <boost/foreach.hpp>
    #include<string>
    
    using namespace boost::property_tree;
    using namespace std;
    
    //解析Json
    bool ParseJson()
    {
    	string str = "{\"ID\":0,\"Student\":[{\"Name\":\"April\"},{\"Name\":\"Harris\"}]}";
    	stringstream stream(str);
    	ptree strTree;
    	try {
    		read_json(stream, strTree);
    	}
    	catch (ptree_error & e) {
    		return false;
    	}
    
    	try {
    		int id = strTree.get<int>("ID");   
    		ptree names = strTree.get_child("Student");  
    		BOOST_FOREACH(ptree::value_type &name, names)
    		{
    			stringstream s;
    			write_json(s, name.second);
    			string image_item = s.str();
    		}
    	}
    	catch (ptree_error & e)
    	{
    		return false;
    	}
    	return true;
    }
    
    
    //构造Json
    bool InsertJson()
    {
    	string str = "{\"ID\":0,\"Student\":[{\"Name\":\"April\"},{\"Name\":\"Harris\"}]}";
    	stringstream stream(str);
    	ptree strTree;
    	try {
    		read_json(stream, strTree);
    	}
    	catch (ptree_error & e) {
    		return false;
    	}
    	ptree subject_info;
    	ptree array1, array2, array3;
    	array1.put("course", "Java");
    	array2.put("course", "C++");
    	array3.put("course", "MySql");
    	subject_info.push_back(make_pair("", array1));
    	subject_info.push_back(make_pair("", array2));
    	subject_info.push_back(make_pair("", array3));
    
    	strTree.put_child("Subject", subject_info);
    	stringstream s;
    	write_json(s, strTree);
    	string outstr = s.str();
    	return true;
    }
    
    int main()
    {
    	ParseJson();
    	InsertJson();
    	system("pause");
    	return 0;
    }

待解析的Json数据如下：

{
      "ID": 0,
      "Student":
      [
        {"Name": "April"},
        {"Name": "Harris"}
      ]
    }

重建后的Json数据如下：

{
      "ID": 0,
      "Student":
      [
        { "Name": "April"},
        { "Name": "Harris"}
      ],
      "Subject":
      [
        {"course": "Java"},
        {"course": "C++"},
        {"course": "MySql"}
       ]
    }