开源库TinyXML2简介及使用

一时失言乱红尘 2021-10-29 22:38 1055阅读 0赞

TinyXML2是一个开源、简单、小巧、高效的C++ XML解析器，它只有一个.h文件和一个.cpp文件组成，可以轻松集成到其它程序中。它解析XML文档并从中构建可以读取、修改和保存的文档对象模型(Document Object Model, DOM)。它不能解析DTD(Document Type Definitions, 文档类型定义)或XSL(eXtensible Stylesheet Language, 扩展样式表语言)。在TinyXML2中，XML数据被解析为可以浏览和操作的C++对象，然后写入磁盘和其它输出流。它不依赖于C++的STL。

TinyXML2的license为ZLib，可以商用，它的源码在[https://github.com/leethomason/tinyxml2][https_github.com_leethomason_tinyxml2] ，最新发布版本为7.1.0。

关于XML的介绍可以参考：[https://blog.csdn.net/fengbingchun/article/details/38978591][https_blog.csdn.net_fengbingchun_article_details_38978591]

以下是测试代码(test\_tinyxml2.cpp)：创建XML(test\_tinyxml2\_create)和解析XML(test\_tinyxml2\_parse)

#include "funset.hpp"
    #include <iostream>
    #include "tinyxml2.h"
    
    int test_tinyxml2_create()
    {
    	const char* declaration = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
    	tinyxml2::XMLDocument doc;
    	tinyxml2::XMLError ret = doc.Parse(declaration);
    	if (ret != 0) {
    		fprintf(stderr, "fail to parse xml file: %s\n", declaration);
    		return -1;
    	}
    
    	tinyxml2::XMLComment* comment = doc.NewComment("this is a xml test file");
    	doc.InsertEndChild(comment);
    
    	tinyxml2::XMLElement* root = doc.NewElement("Root");
    	doc.InsertEndChild(root);
    
    	// User
    	tinyxml2::XMLElement* user = doc.NewElement("User");
    	user->SetAttribute("Name", "fengbingchun");
    	root->InsertEndChild(user);
    
    	tinyxml2::XMLElement* blog = doc.NewElement("Blog");
    	tinyxml2::XMLText* text1 = doc.NewText("CSDN");
    	blog->InsertEndChild(text1);
    	user->InsertEndChild(blog);
    	
    	tinyxml2::XMLElement* code = doc.NewElement("Code");
    	tinyxml2::XMLText* text2 = doc.NewText("GitHub");
    	code->InsertEndChild(text2);
    	user->InsertEndChild(code);
    	
    	// Blog
    	tinyxml2::XMLElement* blog2 = doc.NewElement("Blog");
    	blog2->SetAttribute("Name", "CSDN");
    	root->InsertEndChild(blog2);
    
    	tinyxml2::XMLElement* addr = doc.NewElement("Address");
    	tinyxml2::XMLText* text3 = doc.NewText("https://blog.csdn.net/fengbingchun");
    	addr->InsertEndChild(text3);
    	blog2->InsertEndChild(addr);
    	
    	tinyxml2::XMLElement* id = doc.NewElement("ID");
    	tinyxml2::XMLText* text4 = doc.NewText("fengbingchun");
    	id->InsertEndChild(text4);
    	blog2->InsertEndChild(id);
    
    	// Code
    	tinyxml2::XMLElement* code2 = doc.NewElement("Code");
    	code2->SetAttribute("Name", "GitHub");
    	root->InsertEndChild(code2);
    
    	tinyxml2::XMLElement* addr2 = doc.NewElement("Address");
    	tinyxml2::XMLText* text5 = doc.NewText("https://github.com//fengbingchun");
    	addr2->InsertEndChild(text5);
    	code2->InsertEndChild(addr2);
    	
    	tinyxml2::XMLElement* repositories = doc.NewElement("Repositories");
    	tinyxml2::XMLText* text6 = doc.NewText("27");
    	repositories->InsertEndChild(text6);
    	code2->InsertEndChild(repositories);
    
    #ifdef _MSC_VER
    	const char* file_name = "E:/GitCode/Messy_Test/testdata/test.xml"; 
    #else
    	const char* file_name = "testdata/test.xml";
    #endif
    
    	ret = doc.SaveFile(file_name);
    	if (ret != 0) {
    		fprintf(stderr, "fail to save xml file: %s\n", file_name);
    		return -1;
    	}
    
    	return 0;
    }
    
    int test_tinyxml2_parse()
    {
    #ifdef _MSC_VER
    	const char* file_name = "E:/GitCode/Messy_Test/testdata/test_tinyxml2.xml"; 
    #else
    	const char* file_name = "testdata/test_tinyxml2.xml";
    #endif
    
    	tinyxml2::XMLDocument doc;
    	tinyxml2::XMLError ret = doc.LoadFile(file_name);
    	if (ret != 0) {
    		fprintf(stderr, "fail to load xml file: %s\n", file_name);
    		return -1;
    	}
    
    	tinyxml2::XMLElement* root = doc.RootElement();
    	fprintf(stdout, "root element name: %s\n", root->Name());
    
    	// User
    	tinyxml2::XMLElement* user = root->FirstChildElement("User");
    	if (!user) {
    		fprintf(stderr, "no child element: User\n");
    		return -1;
    	}
    	fprintf(stdout, "user name: %s\n", user->Attribute("Name"));
    
    	tinyxml2::XMLElement* blog = user->FirstChildElement("Blog");
    	if (!blog) {
    		fprintf(stderr, "no child element: Blog, in User\n");
    		return -1;
    	}
    	fprintf(stdout, "blog value: %s\n", blog->GetText());
    	fprintf(stdout, "code value: %s\n\n", user->FirstChildElement("Code")->GetText());
    	
    	// Blog
    	tinyxml2::XMLElement* blog2 = root->FirstChildElement("Blog");
    	if (!blog2) {
    		fprintf(stderr, "no child element: Blog\n");
    		return -1;
    	}
    	fprintf(stdout, "blog name: %s\n", blog2->Attribute("Name"));
    
    	tinyxml2::XMLElement* addr = blog2->FirstChildElement("Address");
    	if (!addr) {
    		fprintf(stderr, "no child element: Address, in Blog\n");
    		return -1;
    	}
    	fprintf(stdout, "address value: %s\n", addr->GetText());
    	fprintf(stdout, "id value: %s\n\n", blog2->FirstChildElement("ID")->GetText());
    	
    	// Code
    	tinyxml2::XMLElement* code = root->FirstChildElement("Code");
    	if (!code) {
    		fprintf(stderr, "no child element: Code\n");
    		return -1;
    	}
    	fprintf(stdout, "code name: %s\n", code->Attribute("Name"));
    
    	tinyxml2::XMLElement* addr2 = code->FirstChildElement("Address");
    	if (!addr2) {
    		fprintf(stderr, "no child element: Address, in Code\n");
    		return -1;
    	}
    	fprintf(stdout, "address value: %s\n", addr2->GetText());
    	fprintf(stdout, "repositories value: %s\n\n", code->FirstChildElement("Repositories")->GetText());
    
    	return 0;
    }

创建xml文件的执行结果如下：

<?xml version="1.0" encoding="UTF-8"?>
    
    <Root>
        <User Name="fengbingchun">
            <Blog>CSDN</Blog>
            <Code>GitHub</Code>
        </User>
        <Blog Name="CSDN">
            <Address>https://blog.csdn.net/fengbingchun</Address>
            <ID>fengbingchun</ID>
        </Blog>
        <Code Name="GitHub">
            <Address>https://github.com//fengbingchun</Address>
            <Repositories>27</Repositories>
        </Code>
    </Root>

解析以上xml文件输出结果如下：

![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_github.com_leethomason_tinyxml2]: https://github.com/leethomason/tinyxml2
[https_blog.csdn.net_fengbingchun_article_details_38978591]: https://blog.csdn.net/fengbingchun/article/details/38978591
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlbmdiaW5nY2h1bg_size_16_color_FFFFFF_t_70]: /images/20211029/fa1a6c08914d458b86fb7484bd4117d1.png
[https_github.com_fengbingchun_Messy_Test]: https://github.com/fengbingchun/Messy_Test