Ubuntu安装ymal

yaml-cpp是github上的一个开源库，通过CMake编译

下载好了，里面有帮助文档，根据帮助文档编译即可

mkdir build
cd build
cmake ..

make
make install

编写一个demo文件，创建一个config.yaml配置文件

name: Randy
Tel: 18666666 
age: 18

languages:
 - Ruby
 - Perl
 - Python

skills: 
  c++: 1
  java: 1
  android: 1
  python: 1

label:
  QQ: hello
  cc: world
  JJ: QCJ

containers:
  - name: hh
    age: 18
  - name: kk
    age: 12
  - name: yy
    age: 30

main.cpp内容：

#include 
#include 
#include "ymal-cpp/yaml.h"
#include 

class Containers
{
public:
    std::string m_name;
    int m_age;
    static std::vector YamlToContainers(YAML::Node& node)
    {
        std::vector containers;
        for (auto it = node["containers"].begin(); it != node["containers"].end(); it++)
        {
            Containers container;
            container.m_name = it->operator[]("name").as();
            container.m_age = it->operator[]("age").as();
            containers.push_back(container);
        }
        return containers;
    }
    std::string ToString(Containers container)
    {
        std::stringstream ss;
        ss << "name: " << container.m_name << 'n' << "age: " << container.m_age << 'n';
        return ss.str();
    }

};


int main(int argc, char** argv)
{
    YAML::Node config = YAML::LoadFile("/home/qiancj/Vmware16/ShareFolder/5Codes/yaml_demo/config.yaml");

    std::cout << "name:" << config["name"].as() << std::endl;
    std::cout << "Tel:" << config["Tel"].as() << std::endl;
    std::cout << "age:" << config["age"].as() << std::endl;
    std::cout << "skills:" << config["skills"]["c++"].as() << std::endl;

    // 读取languages
    for (auto it = config["languages"].begin(); it != config["languages"].end(); it++)
    {
        std::cout << it->as()  << std::endl;
    }
    
    // 读取label
    for (auto it = config["label"].begin(); it != config["label"].end(); it++)
    {
        std::cout << it->first.as() << ": " << it->second.as() << std::endl;
    }

    // 读取containers
    std::vector p_set = Containers::YamlToContainers(config);
    for(auto it : p_set)
    {
        std::cout << it.ToString(it) << std::endl;
    }

    // 写入yaml
    YAML::Node node;
    node["Countries"].push_back("China");
    node["Countries"].push_back("Russia");
    node["Countries"].push_back("Africa");
    node["Colors"]["Black"] = "night";
    node["Colors"]["Red"] = "sun";
    node["Colors"]["Yellow"] = "flower";
    node["Colors"]["Green"] = "tree";
    std:: cout << node << std::endl;
    std::ofstream ofs("config.yaml");
    ofs << node;
    ofs.close();

    return 0;
}

CMakeLists.txt配置如下

project(yaml_demo)
add_definitions(-std=c++11)
include_directories(include)
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin) # 二进制文件的输出目录
Message(STATUS, "PRINT ${PROJECT_SOURCE_DIR}")
link_directories(${PROJECT_SOURCE_DIR}/lib/yaml-cpp)

add_executable(${PROJECT_NAME} main.cpp)

target_include_directories(${PROJECT_NAME} PUBLIC ${PROJECT_SOURCE_DIR}/include)
target_link_libraries(${PROJECT_NAME} ${PROJECT_SOURCE_DIR}/lib/yaml-cpp/libyaml-cpp.a) 

编译过程中总是报错

/tmp/ccCvErNZ.o: In function `YAML::detail::node& YAML::detail::node_data::get(std::string const&, std::shared_ptr)':
cricket.cpp:(.text._ZN4YAML6detail9node_data3getISsEERNS0_4nodeERKT_St10shared_ptrINS0_13memory_holderEE[_ZN4YAML6detail9node_data3getISsEERNS0_4nodeERKT_St10shared_ptrINS0_13memory_holderEE]+0x94): undefined reference to `YAML::detail::node_data::convert_to_map(std::shared_ptr)'
collect2: error: ld returned 1 exit status

stack overflow上建议直接安装libyaml:

apt-get --build source libyaml-cpp0.5/stable
//or
dpkg -i libyaml-cpp0.5*.deb

还是不行，需要在CMakeLists.txt中添加：

FIND_PACKAGE(yaml-cpp REQUIRED)

再次测试可以运行

且生成了新的yaml文件

c++如何使用yaml来进行配置

c++ 解析yaml文件

c++ 开发中利用yaml-cpp读写yaml配置文件