yaml cpp 的安装与使用

1 下载yaml-cpp

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

2 安装yaml-cpp

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cd yaml-cpp   
mkdir build    
cd build   
cmake ..
make -j 4
sudo make install    

3 CMakeList 配置

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find_package(yaml-cpp REQUIRED)    
include_directories(${YAML_CPP_INCLUDE_DIR})   
target_link_libraries(...  yaml-cpp)    

4 yaml文件解析示例代码

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#include <iostream>
#include "yaml-cpp/yaml.h"
#include <fstream>
 
using namespace std;
 
int main(int argc,char** argv)
{
    YAML::Node config;
    try{
         config = YAML::LoadFile("../config.yaml");
    } catch(YAML::BadFile &e) {
        std::cout<<"read error!"<<std::endl;
        return -1;
    }
    
    cout << "Node type " << config.Type() << endl;
    cout << "skills type " << config["skills"].Type() << endl;
 
    //可以用string类型作为下表，读取参数
    string age = "age";
    cout << "age when string is label:" << config[age].as<int>() << endl;
 
    cout << "name:" << config["name"].as<string>() << endl;
    cout << "sex:" << config["sex"].as<string>() << endl;
    cout << "age:" << config["age"].as<int>() << endl;

    //读取不存在的node值，报YAML::TypedBadConversion异常
    try{
        string label = config["label"].as<string>();
    }catch(YAML::TypedBadConversion<string> &e){
        std::cout<<"label node is NULL"<<std::endl;
    }//TypedBadConversion是模板类，读取什么类型的参数就传入什么类型
 
    cout << "skills c++:" << config["skills"]["c++"].as<int>() << endl;
    cout << "skills java:" << config["skills"]["java"].as<int>() << endl;
    cout << "skills android:" << config["skills"]["android"].as<int>() << endl;
    cout << "skills python:" << config["skills"]["python"].as<int>() << endl;
 
    for(YAML::const_iterator it= config["skills"].begin(); it != config["skills"].end();++it)
    {
        cout << it->first.as<string>() << ":" << it->second.as<int>() << endl;
    }
 
    YAML::Node test1 = YAML::Load("[1,2,3,4]");
    cout << " Type: " << test1.Type() << endl;
 
    YAML::Node test2 = YAML::Load("1");
    cout << " Type: " << test2.Type() << endl;
 
    YAML::Node test3 = YAML::Load("{'id':1,'degree':'senior'}");
    cout << " Type: " << test3.Type() << endl;
 
    ofstream fout("./testconfig.yaml"); //保存config为yaml文件
 
    config["score"] = 99;//添加新元素
 
    fout << config;
 
    fout.close();
 
    return 0;
}