在VC中用CMarkup类操纵XML

      首先到http://www.firstobject.com/dn_markup.htm上面下载CMarkup类，将CMarkup.cpp和CMarkup.h导入到我们的工程中就可以了。编译可能会出现问题，解决的方法是在CMarkup.cpp的开头加上#include <stdafx.h>，或者关闭预编译也可以。

1、创建一个XML文档

对于创建一个XML文档，需要实例化一个CMarkup对象，并调用AddElem创建根元素。在这个位置，如果你调用 AddElem("School") ，文档会简单的装一个空元素<School/>. 然后调用AddChildElem 在根元素的下面创建元素。

 1      CMarkup xml;
 2      xml.SetDoc( " <?xml version=\ " 1.0 \ "  encoding=\ " UTF - 8 \ " ?>\r\n " );
 3      xml.AddElem( " School " );
 4      xml.IntoElem();
 5      xml.AddElem( " Department " , " Automation " );
 6      xml.AddElem( " Department " , " Computer " );
 7      xml.AddElem( " Department " , " Math " );
 8      xml.AddElem( " Department " , " English " );
 9      xml.OutOfElem();
10      xml.Save( " School.xml " );

效果如下：

 

1 <? xml version="1.0" encoding="UTF-8" ?>
2 < School >
3      < Department > Automation </ Department >
4      < Department > Computer </ Department >
5      < Department > Math </ Department >
6      < Department > English </ Department >
7 </ School >
8

2、浏览特定元素

 1      CMarkup xml;
 2      xml.Load( " School.xml " );
 3      BOOL bFind = TRUE;
 4      xml.ResetMainPos();
 5      
 6       while (xml.FindChildElem( " Department " ))
 7      {
 8          CString strTagName = _T( "" );
 9          CString strData = _T( "" );
10          strTagName = xml.GetChildTagName();     // 此时节点是父节点
11          strData = xml.GetChildData();
12          TRACE( " \n---tagName:%s,Data:%s--\n " ,strTagName,strData);
13      }

//***********************这样也可以*****************************/

 1      CMarkup xml;
 2      xml.Load( " School.xml " );
 3      BOOL bFind  =  TRUE;
 4      xml.ResetMainPos();
 5      
 6       while  (xml.FindChildElem( " Department " ))        
 7      {
 8          xml.IntoElem();
 9          CString strTagName  =  _T( "" );
10          CString strData  =  _T( "" );
11          strTagName  =  xml.GetTagName();
12          strData  =  xml.GetData();
13          TRACE( " \n---tagName:%s,Data:%s--\n " ,strTagName,strData);
14          xml.OutOfElem();
15      }

//***********************或者这样也可以***************************/

 1      CMarkup xml;
 2      xml.Load( " School.xml " );
 3      BOOL bFind  =  TRUE;
 4      xml.ResetMainPos();
 5      xml.FindElem();   // School
 6      xml.IntoElem();
 7      
 8       while  (xml.FindElem( " Department " ))
 9      {
10          CString strTagName  =  _T( "" );
11          CString strData  =  _T( "" );
12          strTagName  =  xml.GetTagName();
13          strData  =  xml.GetData();
14          TRACE( " \n---tagName:%s,Data:%s--\n " ,strTagName,strData);
15      }

//***********结果**************
      ---tagName:Department,Data:Automation--

---tagName:Department,Data:Computer--

---tagName:Department,Data:Math--

---tagName:Department,Data:English--

3、修改元素
//把Department为”English“改为”Chinese“

 1      CMarkup xml;
 2      BOOL bLoadXml = FALSE;
 3      bLoadXml = xml.Load( " School.xml " );
 4 
 5       if (bLoadXml)
 6      {
 7          CString str = _T( "" );
 8          xml.ResetMainPos();
 9          xml.FindElem();
10          xml.IntoElem();
11           while (xml.FindElem( " Department " ))
12          {
13              str = xml.GetData();
14               if (str == " English " )
15              {
16                  xml.SetData( " Chinese " );
17                  xml.Save( " School.xml " );
18                   break ;
19              }
20          }
21      }

效果如下：

1 <? xml version="1.0" encoding="UTF-8" ?>
2 < School >
3      < Department > Automation </ Department >
4      < Department > Computer </ Department >
5      < Department > Math </ Department >
6      < Department > Chinese </ Department >
7 </ School >
8

4、添加
4、1 添加在最后面（用AddElem）

 1      CMarkup xml;
 2      BOOL bLoadXml = FALSE;
 3      bLoadXml = xml.Load( " School.xml " );
 4       if (bLoadXml)
 5      {
 6          xml.ResetMainPos();
 7          xml.FindElem();
 8          xml.IntoElem();
 9          xml.AddElem( " Department " , " SiQinghua " );
10          xml.OutOfElem();
11          xml.Save( " School.xml " );
12      }

效果如下：

1 <? xml version="1.0" encoding="UTF-8" ?>
2 < School >
3      < Department > Automation </ Department >
4      < Department > Computer </ Department >
5      < Department > Math </ Department >
6      < Department > Chinese </ Department >
7      < Department > SiQinghua </ Department >
8 </ School >

4、2 添加在最前面（用InsertElem）

 1      CMarkup xml;
 2      BOOL bLoadXml = FALSE;
 3      bLoadXml = xml.Load( " School.xml " );
 4       if (bLoadXml)
 5      {
 6          xml.ResetMainPos();
 7          xml.FindElem();
 8          xml.IntoElem();
 9          xml.AddElem( " Department " , " SiQinghua " );
10          xml.OutOfElem();
11          xml.Save( " School.xml " );
12      }

效果如下：

 1 <? xml version="1.0" encoding="UTF-8" ?>
 2 < School >
 3      < Department > NARI </ Department >
 4      < Department > Automation </ Department >
 5      < Department > Computer </ Department >
 6      < Department > Math </ Department >
 7      < Department > Chinese </ Department >
 8      < Department > SiQinghua </ Department >
 9 </ School >
10

5、删除

 1      CMarkup xml;
 2      BOOL bLoadXml = FALSE;
 3      bLoadXml = xml.Load( " School.xml " );
 4       if (bLoadXml)
 5      {
 6          BOOL bFind = TRUE;
 7          xml.ResetMainPos();
 8           while (bFind)
 9          {
10              bFind = xml.FindChildElem( " Department " );
11               if (bFind)
12              {
13                  CString strData = _T( "" );
14                  strData = xml.GetChildData();     // 此时节点还是父节点
15                   if ( " SiQinghua " == strData)
16                  {
17                      xml.RemoveChildElem();
18                      xml.Save( " School.xml " );
19                       break ;
20                  }
21              }
22          }
23      }

效果如下：

1  <? xml version="1.0" encoding="UTF-8" ?>
2  < School >
3       < Department > NARI </ Department >
4       < Department > Automation </ Department >
5       < Department > Computer </ Department >
6       < Department > Math </ Department >
7       < Department > Chinese </ Department >
8  </ School >
9 

上面的例子都是不带属性的，下面举一个带有属性的例子。
1、生成XML文档

 1      CMarkup xml;
 2      xml.SetDoc( " <?xml version=\ " 1.0 \ "  encoding=\ " UTF - 8 \ " ?> " );
 3      xml.AddElem( " UserInfo " );
 4      xml.IntoElem();
 5       for ( int  i = 0 ;i < 10 ;i ++ )
 6      {
 7          CString strID = _T( "" );
 8          CString strPwd = _T( "" );
 9 
10          srand(UINT(time(NULL) + i));  // 产生一个随机数
11           int  nLevel = rand() % 256 ;
12 
13          strID.Format( " UserID%02d " ,i);
14          strPwd.Format( " UserPwd%02d " ,i);
15 
16          xml.AddElem( " User " );
17          xml.AddAttrib( " UserID " ,strID);
18          xml.AddAttrib( " UserPwd " ,strPwd);
19          xml.AddAttrib( " UserLevel " ,nLevel);
20      }
21      xml.OutOfElem();
22      xml.Save( " UserInfo.xml " );

效果如下：

 1 <? xml version="1.0" encoding="UTF-8" ?>
 2 < UserInfo >
 3      < User  UserID ="UserID00"  UserPwd ="UserPwd00"  UserLevel ="85" />
 4      < User  UserID ="UserID01"  UserPwd ="UserPwd01"  UserLevel ="88" />
 5      < User  UserID ="UserID02"  UserPwd ="UserPwd02"  UserLevel ="92" />
 6      < User  UserID ="UserID03"  UserPwd ="UserPwd03"  UserLevel ="95" />
 7      < User  UserID ="UserID04"  UserPwd ="UserPwd04"  UserLevel ="98" />
 8      < User  UserID ="UserID05"  UserPwd ="UserPwd05"  UserLevel ="101" />
 9      < User  UserID ="UserID06"  UserPwd ="UserPwd06"  UserLevel ="105" />
10      < User  UserID ="UserID07"  UserPwd ="UserPwd07"  UserLevel ="108" />
11      < User  UserID ="UserID08"  UserPwd ="UserPwd08"  UserLevel ="111" />
12      < User  UserID ="UserID09"  UserPwd ="UserPwd09"  UserLevel ="115" />
13 </ UserInfo >
14

2、查找特定属性

 1      CMarkup xml;
 2      BOOL bLoadXml = FALSE;
 3      BOOL bFind = FALSE;
 4      bLoadXml = xml.Load( " UserInfo.xml " );
 5       if (bLoadXml)
 6      {
 7          CString strID;
 8          CString strPwd;
 9          xml.ResetMainPos();
10          xml.FindElem();     // UserInfo
11           while (xml.FindChildElem( " User " ))
12          {
13              strID = xml.GetChildAttrib( " UserID " );
14              strPwd = xml.GetChildAttrib( " UserPwd " );
15              TRACE( " \n---id:%s,pwd:%s---\n " ,strID,strPwd);
16               if (strID == " UserID02 "   &&  strPwd == " UserPwd02 " )
17              {
18                  bFind = TRUE;
19                   break ;
20              }
21          }
22      }
23       if (bFind == TRUE)
24          TRACE( " \n---find---\n " );
25       else
26          TRACE( " \n---not find---\n " );

3、修改特定属性

 1      CMarkup xml;
 2      BOOL bFind = FALSE;
 3      BOOL bLoadXml = FALSE;
 4      bLoadXml = xml.Load( " UserInfo.xml " );
 5       if (bLoadXml)
 6      {
 7          CString strID;
 8          CString strPwd;
 9          xml.ResetMainPos();
10          xml.FindElem();     // UserInfo
11           while (xml.FindChildElem( " User " ))
12          {
13              strID = xml.GetChildAttrib( " UserID " );
14              strPwd = xml.GetChildAttrib( " UserPwd " );
15              TRACE( " \n--id:%s,pwd:%s--\n " ,strID,strPwd);
16               if (strID == " UserID02 "   &&  strPwd == " UserPwd02 " )
17              {
18                  bFind = TRUE;
19                  xml.SetChildAttrib( " UserID " ,strID + CString( " Modified " ));
20                  xml.Save( " UserInfo.xml " );
21                   break ;
22              }
23          }
24      }
25       if (bFind == TRUE)
26          TRACE( " \n---find---\n " );
27       else
28          TRACE( " \n---not find---\n " );

效果如下：

 1 <? xml version="1.0" encoding="UTF-8" ?>
 2 < UserInfo >
 3      < User  UserID ="UserID00"  UserPwd ="UserPwd00"  UserLevel ="85" />
 4      < User  UserID ="UserID01"  UserPwd ="UserPwd01"  UserLevel ="88" />
 5      < User  UserID ="UserID02Modified"  UserPwd ="UserPwd02"  UserLevel ="92" />
 6      < User  UserID ="UserID03"  UserPwd ="UserPwd03"  UserLevel ="95" />
 7      < User  UserID ="UserID04"  UserPwd ="UserPwd04"  UserLevel ="98" />
 8      < User  UserID ="UserID05"  UserPwd ="UserPwd05"  UserLevel ="101" />
 9      < User  UserID ="UserID06"  UserPwd ="UserPwd06"  UserLevel ="105" />
10      < User  UserID ="UserID07"  UserPwd ="UserPwd07"  UserLevel ="108" />
11      < User  UserID ="UserID08"  UserPwd ="UserPwd08"  UserLevel ="111" />
12      < User  UserID ="UserID09"  UserPwd ="UserPwd09"  UserLevel ="115" />
13 </ UserInfo >