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，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. 然后调用AddChildElem在根元素的下面创建元素。

CMarkup xml;
xml.SetDoc("\r\n");
xml.AddElem("School");
xml.IntoElem();
xml.AddElem("Department","Automation");
xml.AddElem("Department","Computer");
xml.AddElem("Department","Math");
xml.AddElem("Department","English");
xml.OutOfElem();
xml.Save("School.xml");

效果如下：

<?xml version="1.0" encoding="UTF-8"?>
<School>
    <Department>Automation</Department>
    <Department>Computer</Department>
    <Department>Math</Department>
    <Department>English</Department>
</School>

2.浏览特定元素

CMarkup xml;
xml.Load("School.xml");
BOOL bFind=TRUE;
xml.ResetMainPos();

while(xml.FindChildElem("Department"))
{
	CString strTagName=_T("");
	CString strData=_T("");
	strTagName=xml.GetChildTagName();    //此时节点是父节点
	strData=xml.GetChildData();
	TRACE("\n---tagName:%s,Data:%s--\n",strTagName,strData);
}

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

CMarkup xml;
xml.Load("School.xml");
BOOL bFind = TRUE;
xml.ResetMainPos();

while (xml.FindChildElem("Department"))        
{
	xml.IntoElem();
	CString strTagName = _T("");
	CString strData = _T("");
	strTagName = xml.GetTagName();
	strData = xml.GetData();
	TRACE("\n---tagName:%s,Data:%s--\n",strTagName,strData);
	xml.OutOfElem();
}

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

CMarkup xml;
xml.Load("School.xml");
BOOL bFind = TRUE;
xml.ResetMainPos();
xml.FindElem(); //School
xml.IntoElem();

while (xml.FindElem("Department"))
{
	CString strTagName = _T("");
	CString strData = _T("");
	strTagName = xml.GetTagName();
	strData = xml.GetData();
	TRACE("\n---tagName:%s,Data:%s--\n",strTagName,strData);
}

//***********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"

CMarkup xml;
BOOL bLoadXml=FALSE;
bLoadXml=xml.Load("School.xml");

if(bLoadXml)
{
	CString str=_T("");
	xml.ResetMainPos();
	xml.FindElem();
	xml.IntoElem();
	while(xml.FindElem("Department"))
	{
		str=xml.GetData();
		if(str=="English")
		{
			xml.SetData("Chinese");
			xml.Save("School.xml");
			break;
		}
	}
}

效果如下：

<?xml version="1.0" encoding="UTF-8"?>
<School>
	<Department>Automation</Department>
	<Department>Computer</Department>
	<Department>Math</Department>
	<Department>Chinese</Department>
</School>

4.添加
4.1 添加在最后面（用AddElem）

CMarkup xml;
BOOL bLoadXml=FALSE;
bLoadXml=xml.Load("School.xml");
if(bLoadXml)
{
	xml.ResetMainPos();
	xml.FindElem();
	xml.IntoElem();
	xml.AddElem("Department","SiQinghua");
	xml.OutOfElem();
	xml.Save("School.xml");
}

效果如下：

<?xml version="1.0" encoding="UTF-8"?>
<School>
    <Department>Automation</Department>
    <Department>Computer</Department>
    <Department>Math</Department>
    <Department>Chinese</Department>
    <Department>SiQinghua</Department>
</School>

4.2 添加在最前面（用InsertElem）

CMarkup xml;
BOOL bLoadXml=FALSE;
bLoadXml=xml.Load("School.xml");
if(bLoadXml)
{
	xml.ResetMainPos();
	xml.FindElem();
	xml.IntoElem();
	xml.AddElem("Department","SiQinghua");
	xml.OutOfElem();
	xml.Save("School.xml");
}

效果如下：

<?xml version="1.0" encoding="UTF-8"?>
<School>
	<Department>NARI</Department>
	<Department>Automation</Department>
	<Department>Computer</Department>
	<Department>Math</Department>
	<Department>Chinese</Department>
	<Department>SiQinghua</Department>
</School>

5.删除

CMarkup xml;
BOOL bLoadXml=FALSE;
bLoadXml=xml.Load("School.xml");
if(bLoadXml)
{
	BOOL bFind=TRUE;
	xml.ResetMainPos();
	while(bFind)
	{
		bFind=xml.FindChildElem("Department");
		if(bFind)
		{
			CString strData=_T("");
			strData=xml.GetChildData();    //此时节点还是父节点
			if("SiQinghua"==strData)
			{
				xml.RemoveChildElem();
				xml.Save("School.xml");
				break;
			}
		}
	}
}

效果如下：

<?xml version="1.0" encoding="UTF-8"?>
<School>
	<Department>NARI</Department>
	<Department>Automation</Department>
	<Department>Computer</Department>
	<Department>Math</Department>
	<Department>Chinese</Department>
</School>

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

CMarkup xml;
xml.SetDoc("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
xml.AddElem("UserInfo");
xml.IntoElem();
for(int i=0;i<10;i++)
{
	CString strID=_T("");
	CString strPwd=_T("");

	srand(UINT(time(NULL)+i)); //产生一个随机数
	int nLevel=rand()%256;

	strID.Format("UserID%02d",i);
	strPwd.Format("UserPwd%02d",i);

	xml.AddElem("User");
	xml.AddAttrib("UserID",strID);
	xml.AddAttrib("UserPwd",strPwd);
	xml.AddAttrib("UserLevel",nLevel);
}
xml.OutOfElem();
xml.Save("UserInfo.xml");

效果如下：

<?xml version="1.0" encoding="UTF-8"?>
<UserInfo>
	<User UserID="UserID00" UserPwd="UserPwd00" UserLevel="85"/>
	<User UserID="UserID01" UserPwd="UserPwd01" UserLevel="88"/>
	<User UserID="UserID02" UserPwd="UserPwd02" UserLevel="92"/>
	<User UserID="UserID03" UserPwd="UserPwd03" UserLevel="95"/>
	<User UserID="UserID04" UserPwd="UserPwd04" UserLevel="98"/>
	<User UserID="UserID05" UserPwd="UserPwd05" UserLevel="101"/>
	<User UserID="UserID06" UserPwd="UserPwd06" UserLevel="105"/>
	<User UserID="UserID07" UserPwd="UserPwd07" UserLevel="108"/>
	<User UserID="UserID08" UserPwd="UserPwd08" UserLevel="111"/>
	<User UserID="UserID09" UserPwd="UserPwd09" UserLevel="115"/>
</UserInfo>

2.查找特定属性

CMarkup xml;
BOOL bLoadXml=FALSE;
BOOL bFind=FALSE;
bLoadXml=xml.Load("UserInfo.xml");
if(bLoadXml)
{
	CString strID;
	CString strPwd;
	xml.ResetMainPos();
	xml.FindElem();    //UserInfo
	while(xml.FindChildElem("User"))
	{
		strID=xml.GetChildAttrib("UserID");
		strPwd=xml.GetChildAttrib("UserPwd");
		TRACE("\n---id:%s,pwd:%s---\n",strID,strPwd);
		if(strID=="UserID02" && strPwd=="UserPwd02")
		{
			bFind=TRUE;
			break;
		}
	}
}
if(bFind==TRUE)
	TRACE("\n---find---\n");
else
	TRACE("\n---not find---\n");

3.修改特定属性

CMarkup xml;
BOOL bFind=FALSE;
BOOL bLoadXml=FALSE;
bLoadXml=xml.Load("UserInfo.xml");
if(bLoadXml)
{
	CString strID;
	CString strPwd;
	xml.ResetMainPos();
	xml.FindElem();    //UserInfo
	while(xml.FindChildElem("User"))
	{
		strID=xml.GetChildAttrib("UserID");
		strPwd=xml.GetChildAttrib("UserPwd");
		TRACE("\n--id:%s,pwd:%s--\n",strID,strPwd);
		if(strID=="UserID02" && strPwd=="UserPwd02")
		{
			bFind=TRUE;
			xml.SetChildAttrib("UserID",strID+CString("Modified"));
			xml.Save("UserInfo.xml");
			break;
		}
	}
}
if(bFind==TRUE)
	TRACE("\n---find---\n");
else
	TRACE("\n---not find---\n");

效果如下：

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

参考链接

在VC中用CMarkup类操纵XML

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