VC读写XML文件 - 北纬91℃ - C++博客

骑猪看日落 2022-08-24 00:00 134阅读 0赞

导读：

1、安装MSXML 4.0 SP2。在VC6中建立一个基于Dialog的工程。如图：  
  
![XML.JPG][]  
  
在界面上放置3个编辑框、1个按钮控件。其中属性设置如下。  
编辑框：

<table style="WIDTH: 409px; HEIGHT: 108px"> 
 <tbody> 
 <tr> 
 <td>ID </td> 
 <td>Category </td> 
 <td>Variable Type </td> 
 <td>Variable Name </td> 
 </tr> 
 <tr> 
 <td>IDC_ID </td> 
 <td>Value </td> 
 <td>CString </td> 
 <td>m_strId </td> 
 </tr> 
 <tr> 
 <td>IDC_AUTHOR </td> 
 <td>Value </td> 
 <td>CString </td> 
 <td>m_strAuthor </td> 
 </tr> 
 <tr> 
 <td>IDC_TITLE </td> 
 <td>Value </td> 
 <td>CString </td> 
 <td>m_strTitle </td> 
 </tr> 
 </tbody> 
</table>

按钮：

<table style="WIDTH: 235px; HEIGHT: 70px"> 
 <tbody> 
 <tr> 
 <td>ID </td> 
 <td>Caption </td> 
 </tr> 
 <tr> 
 <td>IDC_GENERATE </td> 
 <td>Generate </td> 
 </tr> 
 <tr> 
 <td>IDC_LOAD </td> 
 <td>Load </td> 
 </tr> 
 </tbody> 
</table>

2、在App类的InitInstance函数里面加入如下代码：

![None.gif][] // Com口初始化   
![None.gif][] AfxOleInit();

3、在StdAfx.h中引入动态链接库 MSXML.DLL(C:/windows/system32/msxml4.dll)

![None.gif][] \#import < msxml4.dll >

4、双击Generate按钮，在消息处理函数中添加如下代码：

![None.gif][] UpdateData(TRUE);  
![None.gif][]MSXML2::IXMLDOMDocumentPtr pDoc;  
![None.gif][]MSXML2::IXMLDOMElementPtr xmlRoot ;  
![None.gif][] // 创建DOMDocument对象   
![None.gif][] HRESULT hr  =  pDoc.CreateInstance(\_\_uuidof(MSXML2::DOMDocument40));  
![None.gif][] if ( ! SUCCEEDED(hr))  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][] MessageBox( " 无法创建DOMDocument对象，请检查是否安装了MS XML Parser 运行库! ");  
![InBlock.gif][] return ;  
![ExpandedBlockEnd.gif][]\}   
![None.gif][] // 根节点的名称为Book  
![None.gif][] // 创建元素并添加到文档中   
![None.gif][] xmlRoot = pDoc \-> createElement((\_bstr\_t) " Book " );  
![None.gif][] // 设置属性   
![None.gif][] xmlRoot \-> setAttribute( " id " ,( const  char  \* )m\_strId);  
![None.gif][]pDoc \-> appendChild(xmlRoot);  
![None.gif][]MSXML2::IXMLDOMElementPtr pNode;  
![None.gif][] // 添加“author”元素   
![None.gif][] pNode = pDoc \-> createElement((\_bstr\_t) " Author " );  
![None.gif][]pNode \-> Puttext((\_bstr\_t)( const  char  \* )m\_strAuthor);  
![None.gif][]xmlRoot \-> appendChild(pNode);  
![None.gif][] // 添加“Title”元素   
![None.gif][] pNode = pDoc \-> createElement( " Title " );  
![None.gif][]pNode \-> Puttext(( const  char  \* )m\_strTitle);  
![None.gif][]xmlRoot \-> appendChild(pNode);  
![None.gif][] // 保存到文件  
![None.gif][] // 如果不存在就建立,存在就覆盖    
![None.gif][] pDoc \-> save( " d://he.xml " );

双击Load按钮，在消息处理函数中添加如下代码：

![None.gif][] MSXML2::IXMLDOMDocumentPtr pDoc;  
![None.gif][]HRESULT hr;  
![None.gif][]hr = pDoc.CreateInstance(\_\_uuidof(MSXML2::DOMDocument40));  
![None.gif][] if (FAILED(hr))  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][] MessageBox( " 无法创建DOMDocument对象，请检查是否安装了MS XML Parser 运行库! ");  
![InBlock.gif][] return ;  
![ExpandedBlockEnd.gif][]\}   
![None.gif][] // 加载文件    
![None.gif][] pDoc \-> load( " d://he.xml " );  
![None.gif][]MSXML2::IXMLDOMNodePtr pNode;  
![None.gif][] // 在树中查找名为Book的节点," // "表示在任意一层查找    
![None.gif][] pNode = pDoc \-> selectSingleNode( " //Book " );  
![None.gif][]MSXML2::DOMNodeType nodeType;  
![None.gif][] // 得到节点类型    
![None.gif][] pNode \-> get\_nodeType( & nodeType);  
![None.gif][] // 节点名称    
![None.gif][] CString strName;  
![None.gif][]strName = ( char  \* )pNode \-> GetnodeName();  
![None.gif][] // 节点属性,放在链表中    
![None.gif][] MSXML2::IXMLDOMNamedNodeMapPtr pAttrMap = NULL;  
![None.gif][]MSXML2::IXMLDOMNodePtr pAttrItem;  
![None.gif][]\_variant\_t variantvalue;  
![None.gif][]pNode \-> get\_attributes( & pAttrMap);  
![None.gif][] long  count;  
![None.gif][]count = pAttrMap \-> get\_length( & count);  
![None.gif][]pAttrMap \-> get\_item( 0 , & pAttrItem);  
![None.gif][] // 取得节点的值   
![None.gif][] pAttrItem \-> get\_nodeTypedValue( & variantvalue);  
![None.gif][]m\_strId = ( char  \* )(\_bstr\_t)variantvalue;  
![None.gif][]UpdateData(FALSE);

本文转自  
[http://www.cppblog.com/cnfangbo/archive/2007/04/13/21811.html][http_www.cppblog.com_cnfangbo_archive_2007_04_13_21811.html]

[XML.JPG]: /images/20220823/9669c41ddfb04550b538267b5c227b89.png
[None.gif]: /images/20220823/be8a0dfadf614caa918aa99ff9a058bb.png
[ExpandedBlockStart.gif]: http://www.cppblog.com/Images/OutliningIndicators/ExpandedBlockStart.gif
[ContractedBlock.gif]: http://www.cppblog.com/Images/OutliningIndicators/ContractedBlock.gif
[dot.gif]: /images/20220823/e57f5f7ae7924e068eba79c0be67ef31.png
[InBlock.gif]: /images/20220823/75aa888ee9964a04ac2b054980639ba1.png
[ExpandedBlockEnd.gif]: /images/20220823/e1f5841d44994d8e9a30fd25bb453f2e.png
[http_www.cppblog.com_cnfangbo_archive_2007_04_13_21811.html]: http://www.cppblog.com/cnfangbo/archive/2007/04/13/21811.html