tinyXML(1)认识xml

最新推荐文章于 2023-12-02 23:42:53 发布

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最新推荐文章于 2023-12-02 23:42:53 发布

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本文详细介绍了如何在程序中使用tinyXML库，并解释了其内部工作原理。通过示例展示了如何读取和解析XML文件，从XML文件的第一行声明到每个元素的处理过程，包括注释、元素、文本和特殊标签的转换。

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原文链接如下:
http://www.grinninglizard.com/tinyxmldocs/index.html

在程序中使用tinyXML：

To Use in an Application:

使用tinyXML，只需将解压的文件，tinyxml.cpp, tinyxml.h, tinyxmlerror.cpp, tinyxmlparser.cpp, tinystr.cpp, and tinystr.h 加入到你的工程中去，就可以了。它可以编译于任何兼容c++的系统， TinyXML无须开启Exception和RTTI.
Add tinyxml.cpp, tinyxml.h, tinyxmlerror.cpp, tinyxmlparser.cpp, tinystr.cpp, and tinystr.h to your project or make file. That’s it! It should compile on any reasonably compliant C++ system. You do not need to enable exceptions or RTTI for TinyXML.

TinyXML是如何工作的

How TinyXML works.

示例如下:
An example is probably the best way to go. Take:

<?xml version="1.0" standalone=no>
<!-- Our to do list data -->
<ToDo>
    <Item priority="1"> Go to the <bold>Toy store!</bold></Item>
    <Item priority="2"> Do bills</Item>
</ToDo>

看似无关的代码，却是是你读写解析文件的开始:
Its not much of a To Do list, but it will do. To read this file (say “demo.xml”) you would create a document, and parse it in:

TiXmlDocument doc( "demo.xml" );
doc.LoadFile();

加载文件以后，看一下文件中的行语句跟DOM之间的关系。
And its ready to go. Now lets look at some lines and how they relate to the DOM.

<?xml version="1.0" standalone=no>

demo.xml第一行是一个声明，被转化为TiXmlDeclaration 类对象，是demo.xml的第一个子节点。
The first line is a declaration, and gets turned into the TiXmlDeclaration class. It will be the first child of the document node.

这是TinyXML唯一一个特殊处理的标记，此标记存储在TiXmlUnknown类对象中，在写入硬盘时，不要忘了此命令。
This is the only directive/special tag parsed by TinyXML. Generally directive tags are stored in TiXmlUnknown so the commands wont be lost when it is saved back to disk.

<!-- Our to do list data -->

一句注释，将会转化为 TiXmlComment 类对象。
A comment. Will become a TiXmlComment object.

<ToDo>

ToDo标记定义了一个TiXmlElement 对象，此标记没有任何的属性，但包含两个成员。
The “ToDo” tag defines a TiXmlElement object. This one does not have any attributes, but does contain 2 other elements.

<Item priority="1">

创建了一个ToDo成员的子成员。这个成员包含一个属性，名字是”priority” ,值是”1”。
Creates another TiXmlElement which is a child of the “ToDo” element. This element has 1 attribute, with the name “priority” and the value “1”.

Go to the

一个TiXmlText对象，是一个叶节点，不能包含其它的子节点。是的 Item成员的孩子。
A TiXmlText. This is a leaf node and cannot contain other nodes. It is a child of the “Item” TiXmlElement.

<bold>

又一个Item成员的子成员。
Another TiXmlElement, this one a child of the “Item” element.

Etc.

回础一下，你得到的整下对象树:
Looking at the entire object tree, you end up with:

TiXmlDocument                   "demo.xml"
    TiXmlDeclaration            "version='1.0'" "standalone=no"
    TiXmlComment                " Our to do list data"
    TiXmlElement                "ToDo"
        TiXmlElement            "Item" Attribtutes: priority = 1
            TiXmlText           "Go to the "
            TiXmlElement        "bold"
                TiXmlText       "Toy store!"
        TiXmlElement            "Item" Attributes: priority=2
            TiXmlText           "Do bills"