1 安装yaml-cpp

（1）cd 到yaml-cpp下载的目的路径

例如：cd /home/test

（2）git clone https://github.com/jbeder/yaml-cpp

（3）cd yaml-cpp

（4）创建build文件夹

mkdir build

（5）cd build

（6）cmake .. -D BUILD_SHARED_LIBS=ON

说明： yaml-cpp 默认构建的是静态库，就是 .a 文件，如果想构建动态库，就需要在 cmake 时指定，如上。

（7）make

至此，就结束啦。

2 工程结构

（1）test.yaml的内容

name: Jack
sex: male
age: 22
code: 1102698
skills:
  c++: 1
  HTML: 1

（2）CmakeLists.txt

cmake_minimum_required(VERSION 3.22)
project(yaml_practice)

set(CMAKE_CXX_STANDARD 14)

include_directories("/home/test/yaml-cpp/include/")

add_executable(yaml_practice main.cpp)
target_link_libraries( yaml_practice /home/test/yaml-cpp/build/libyaml-cpp.so)

（3）代码

main.cpp
#include <iostream>
#include <string>
#include <fstream>
#include "yaml-cpp/yaml.h"
using namespace std;

void get_content(YAML::Node yamlTest)
{
    for (YAML::const_iterator it = yamlTest.begin(); it != yamlTest.end(); it++)
    {
        if(it->second.size() == 0) {
            cout << it->first.as<string>() << ": " << it->second << endl;
        }
        else{
            YAML::Node value = it->second;
            for(YAML::const_iterator id = value.begin(); id != value.end(); id++)
                cout << it->first.as<string>() << ": " << id->first<< ": " << id->second << endl;
            }
        }
    }

void add_content(string config_path){
    YAML::Node yamlTest = YAML::LoadFile(config_path);
    ofstream fout(config_path);
    yamlTest["skills"]["python"] = 0;
    fout << yamlTest;
    fout.close();
    get_content(yamlTest);
}
void delete_content(string config_path){
    YAML::Node yamlTest = YAML::LoadFile(config_path);
    ofstream fout(config_path);
    yamlTest["skills"].remove("HTML");
    fout << yamlTest;
    fout.close();
    get_content(yamlTest);
}
void edit_content(string config_path){
    YAML::Node yamlTest = YAML::LoadFile(config_path);
    ofstream fout(config_path);
    yamlTest["code"] = 1102;
    fout << yamlTest;
    fout.close();
    get_content(yamlTest);
}
int main(){
    string config_path = "/home/test/CLionProjects/practice/test.yaml";
    cout << "*** original content :" << endl;
    YAML::Node yamlTest = YAML::LoadFile(config_path);
    get_content(yamlTest);
    cout << "*** add content : skills python" << endl;
    add_content(config_path);
    cout << "*** delete content : skills HTML" << endl;
    delete_content(config_path);
    cout << "*** edit content : code=1102" << endl;
    edit_content(config_path);
    return 0;
}