YAML开源库yaml-cpp简介及使用

比眉伴天荒 2022-02-03 05:29 1774阅读 0赞

关于YAML的介绍可以参考：[https://blog.csdn.net/fengbingchun/article/details/88090609][https_blog.csdn.net_fengbingchun_article_details_88090609]

yaml-cpp是用c++实现的用来解析和生成yaml文件的，源码地址在[https://github.com/jbeder/yaml-cpp][https_github.com_jbeder_yaml-cpp]**，**这里使用的是最新发布的稳定版0.6.2.

解析和产生yaml文件的测试代码如下：

#include "funset.hpp"
    #include <string>
    #include <fstream>
    #include <yaml-cpp/yaml.h>
    
    int test_parse_yaml_file()
    {
    #ifdef _MSC_VER
    	YAML::Node config = YAML::LoadFile("E:/GitCode/Messy_Test/testdata/test_yaml-cpp.yml");
    #else
    	YAML::Node config = YAML::LoadFile("testdata/test_yaml-cpp.yml");
    #endif
    	
    	std::string blog_name{"xxxxx"}, blog_id{"xxxxx"}, blog_url{"xxxxx"};
    	if (config["blog"]) {
    		if (config["blog"]["name"])
    			blog_name = config["blog"]["name"].as<std::string>();
    		if (config["blog"]["id"])
    			blog_id = config["blog"]["id"].as<std::string>();
    		if (config["blog"]["url"])
    			blog_url = config["blog"]["url"].as<std::string>();
    
    	} else {
    		fprintf(stderr, "the node blog doesn't exist\n");
    	}
    
    	fprintf(stdout, "blog name: %s, id: %s, url: %s\n",
    		blog_name.c_str(), blog_id.c_str(), blog_url.c_str());
    
    	bool value1, value2;
    	if (config["value1"])
    		value1 = config["value1"].as<bool>();
    	if (config["value2"])
    		value2 = config["value2"].as<bool>();
    
    	fprintf(stdout, "value1: %d, value2: %d\n", value1, value2);
    
    	int number1;
    	std::string number2, number3;
    	float number4;
    	if (config["number1"])
    		number1 = config["number1"].as<int>();
    	if (config["number2"])
    		number2 = config["number2"].as<std::string>();
    	if (config["number3"])
    		number3 = config["number3"].as<std::string>();
    	if (config["number4"])
    		number4 = config["number4"].as<float>();
    	fprintf(stdout, "number1: %d, number2: %s, number3: %s, number4: %f\n",
    		number1, number2.c_str(), number3.c_str(), number4);
    
    	std::string github_url, github_repos;
    	if (config["github"])
    		github_url = config["github"][0].as<std::string>();
    		github_repos = config["github"][1].as<std::string>();
    	fprintf(stdout, "github url: %s, repos: %s\n", github_url.c_str(), github_repos.c_str());
    
    	return 0;
    }
    
    int test_generate_yaml_file()
    {
    	YAML::Node node;
    	
    	node["language"] = "cpp";
    	node["version"] = 2;	
    
    	node["url"].push_back("https://blog.csdn.net/fengbingchun");
    	node["url"].push_back("https://github.com/fengbingchun");
    
    	YAML::Node primes = YAML::Load("[2, 3, 5, 7, 11]");
    	primes.push_back(13);
    	fprintf(stdout, "primes size: %d\n", primes.size());
    	node["primes"] = primes;
    
    	YAML::Node lineup = YAML::Load("{1B: Prince Fielder, 2B: Rickie Weeks, LF: Ryan Braun}");
    	lineup["RF"] = "Corey Hart";
    	lineup["C"] = "Jonathan Lucroy";
    	node["name"] = lineup;
    
    	node["platform"]["linux"].push_back("x86");
    	node["platform"]["linux"].push_back("x86_64");
    	node["platform"]["linux"].push_back("armv7");
     
    	node["platform"]["windows"].push_back("x86");
    	node["platform"]["windows"].push_back("x86_64");
    
    #ifdef _MSC_VER
    	std::ofstream fout("E:/GitCode/Messy_Test/testdata/tmp.yml");
    #else
    	std::ofstream fout("testdata/tmp.yaml");
    #endif
    	fout << node;
    
    	return 0;
    }

test\_yaml-cpp.yml内容如下：

# config file
    ---
    
    blog:
      name: csdn
      id: fengbingchun
      url: https://blog.csdn.net/fengbingchun
    
    commands:
      version:
      - g++ --version
      - cmake --version
      - git --version
    
    value1: true
    value2: false
    value3: ~
    
    number1: 123
    number2: !!str 123
    number3: "123"
    number4: !!float 123
    
    github: 
      - https://github.com/fengbingchun
      - NN_Test Face_Test OpenCV_Test
        Messy_Test CUDA_Test
    
    data1: |
      There once
      was a
         short man
    
    data2: >
      There once
      was a
         short man
    
    date1: 2019-03-03
    
    step: &id001   # defines anchor label &id001
      instrument:  Lasik 2000
      pulseEnergy: 5.4
    
    step2: *id001   # refers to the first step (with anchor &id001)
    
    ...

解析yaml文件输出结果如下：

![20190508213904529.png][]

产生yaml文件的内容如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlbmdiaW5nY2h1bg_size_16_color_FFFFFF_t_70][]

**GitHub**： [https://github.com/fengbingchun/Messy\_Test][https_github.com_fengbingchun_Messy_Test]

[https_blog.csdn.net_fengbingchun_article_details_88090609]: https://blog.csdn.net/fengbingchun/article/details/88090609
[https_github.com_jbeder_yaml-cpp]: https://github.com/jbeder/yaml-cpp
[20190508213904529.png]: /images/20220203/1da1f03ddb124d51a05f301f6411e0ff.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlbmdiaW5nY2h1bg_size_16_color_FFFFFF_t_70]: /images/20220203/5ef55421eebf42ab8423edb78e13730a.png
[https_github.com_fengbingchun_Messy_Test]: https://github.com/fengbingchun/Messy_Test