首先建立一个XML文件，我的机器软件configuration如下：
Windows xp professional sp2
IE 6.0( 无关紧要)
VS 2003
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#import <msxml3.dll> //I have no idea why msxl4 cannot be used
//in my PC, may be something on personal
//discrimination
using namespace MSXML2;///the same to above///
-----------------------------------------------------------------------------------创建文件
int CreateXMLFile(char * xml_file_name)
{
// create an xml file named xml_file_name comtemporily
// if the return val is "0",it means that creation
// if failed
::CoInitialize(NULL);// this item must be included
//it is fatal ,else it will failed
//then at last “::CoUninitialize();”
//matched
MSXML2::IXMLDOMDocumentPtr pDoc;
HRESULT hr = pDoc.CreateInstance(__uuidof(DOMDocument30));//
//<msxml3.dll> version is 3.0
if(!(SUCCEEDED(hr)))//faild
{
return 0;
}
MSXML2::IXMLDOMElementPtr pPolicy=pDoc->createElement("Local");
pDoc->appendChild(pPolicy);
{ // the brackets including 1,2,3 can show the
//tree structure of the xml file
// nodes
//1
MSXML2::IXMLDOMElementPtr pPolicyType;
pPolicyType=pDoc->createElement("North");
pPolicyType->Puttext("Piking");
pPolicy->appendChild(pPolicyType);
pPolicyType=pDoc->createElement("South");
pPolicy->appendChild(pPolicyType);
{//2.1
MSXML2::IXMLDOMElementPtr pControlType;
pControlType=pDoc->createElement("Shanghai");
pControlType->Puttext("Xujiahui");
pPolicyType->appendChild(pControlType);
pControlType.Release();
}//end 2.1
pPolicyType=pDoc->createElement("East");
pPolicy->appendChild(pPolicyType);
{//2.2
MSXML2::IXMLDOMElementPtr pProcessType;
pProcessType=pDoc->createElement("Heilongjiang");
pProcessType->Puttext("harbin,Qiqihar");
pPolicyType->appendChild(pProcessType);
pProcessType=pDoc->createElement("Liaoning");
pProcessType->Puttext("ShenYang,Dalian");
pPolicyType->appendChild(pProcessType);
pProcessType.Release();
}//end 2.2
_variant_t varXml(xml_file_name);
pDoc->save(varXml); //save the file
pPolicy.Release();
pPolicyType.Release();
}//end 1
pDoc.Release();
::CoUninitialize();
//necessary it same as new and delete
return 1;
}
产生的文件如下。。
<Location>
<North> Pingking</North>
<South>
<Shanghai>Xujiahui</Shanghai>
</South>
<East>
<Heilongjiang>harbin,qiqihar</Heilongjiang>
<Liaoning>Shenyang,Dalian</Liaoning>
</East>
-----------------------------------------------------------------------------------------查找值
访问结点时，如果要读<North>的值，就直接把”North”写进去，返回的就是Pingking了，
要访问<Shanghai>要代入”South//Shanghai”， 这个和注册表分健值很像
char* GetValueFromXml( char* nodeName)
{// get the value of certain node named nodeName
// from the xml file
// the return value 0 represent failure
char* nodeValue=NULL;
::CoInitialize(NULL);
MSXML2::IXMLDOMDocumentPtr pDoc;
HRESULT hr = pDoc.CreateInstance(__uuidof(DOMDocument30));
if(!(SUCCEEDED(hr)))
{
return nodeValue;
}
hr=pDoc->load("book.xml");
if(!SUCCEEDED(hr))
{
MSXML2::IXMLDOMElementPtr pPolicyNode=pDoc->GetdocumentElement();
MSXML2::IXMLDOMElementPtr pSelectNode=pPolicyNode->selectSingleNode(nodeName);
nodeValue = _com_util::ConvertBSTRToString(pSelectNode->text);
pPolicyNode.Release();
pSelectNode.Release();
}
pDoc.Release();
::CoUninitialize();
return nodeValue;
}
--------------------------------------------------------------------------------修改XML 文件中的某一个结点的值
访问方法同上
int modify(const char* nodeName,char* nodeValue)//前者为结点名，后者为结点的字串值。
{// modify the value of node named as nodeName
// the new value is nodeValue
// if the xml file is not existed then return
// 0
::CoInitialize(NULL);
MSXML2::IXMLDOMDocumentPtr pDoc;
HRESULT hr = pDoc.CreateInstance(__uuidof(DOMDocument30));
int rtval=0;
if(!(SUCCEEDED(hr)))
{
rtval=0;
return rtval;
}
hr=pDoc->load("book.xml");// 文件名。
if(!SUCCEEDED(hr))
{
MSXML2::IXMLDOMElementPtr pPolicyNode=pDoc->GetdocumentElement();
MSXML2::IXMLDOMElementPtr 二pSelectNode=pPolicyNode->selectSingleNode(nodeName);
pSelectNode->Puttext(nodeValue);
pDoc->save("book.xml");
pPolicyNode.Release();
pSelectNode.Release();
rtval=1;
}
pDoc.Release();
::CoUninitialize();
return rtval;
}
-------------------------------------------------------------------------------------------------删去结点
这个就是一个什么
remove
的成员函数就搞定了，和查找的差不多，先找到要删的结点，就行了。。当然删后要保存了，这一点不同，想必都知道。。
