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MFC 解析XML

2020-05-21 XML 前端之家

前端之家收集整理的这篇文章主要介绍了MFC 解析XML，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

现在经常会对XML文件进行操作，怎么在MFC下去读和解析XML文件呢？直接上代码：

首先得等在stdafx.h中加入这句，以引入MSXML命名空间

#import <msxml3.dll> named_guids
using namespace MSXML2;

然后再要使用的类的头文件加入：

[cpp]view plaincopy 
   
 //XMLParserintellecturalpointer(usedinparsingXMLfile)

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MSXML2::IXMLDOMDocument2Ptrm_plDomDocument;

MSXML2::IXMLDOMElementPtrm_pDocRoot;

然后在初始化函数中加入对XML COM的初始化：

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//intianlizeXMLParserCOM

::CoInitialize(NULL);
HRESULThr=m_plDomDocument.CreateInstance(MSXML2::CLSID_DOMDocument);
if(Failed(hr))
{
_com_errorer(hr);
AfxMessageBox(er.ErrorMessage());
EndDialog(1);
}

接着是具体的函数：

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CDemoDlg::OnBnClickedButtonOpenxml()

//atfirst,weshouldclearm_strXML'scontentstoshownewdata
m_strXMLData="";
CFileDialogfileDlg(TRUE);
if(IDOK==fileDlg.DoModal())
m_strXMLPath=fileDlg.GetPathName();
m_strXMLContents="Emptydocument";
//justincaseyoudon'tgetanything
UpdateData(FALSE);
//SpecifyXMLfilename
CStringstrFileName=m_strXMLPath;
//ConvertXMLfilenamestringtosomethingCOMcanhandle
_bstr_tbstrFileName;
bstrFileName=strFileName.AllocSysString();
//CalltheIXMLDOMDocumentPtr'sloadfunctiontoloadXMLfile
variant_tvResult;
vResult=m_plDomDocument->load(bstrFileName);
if(((bool)vResult)==TRUE)//success
{
//ConvertbstrtosomethingyoucanuseinVC++
_bstr_tbstrDocContents=m_plDomDocument->xml;
m_strXMLContents=(LPCTSTR)bstrDocContents;
//getXMLdataandshowonEditControl
MSXML2::IXMLDOMNodePtrm_pXMLRoot=m_plDomDocument->documentElement;//firstchildispoint
//m_strXMLData=_T(",")+DisplayXMLChildren(m_pXMLRoot);
//looptoshowgetpoint'sLonandLanandsaveinmap<CString,CString>LonLanPoints
for(MSXML2::IXMLDOMNodePtrpChild=m_pXMLRoot->firstChild;pChild!=NULL;pChild=pChild->nextSibling)
DisplayXMLChildren(pChild);
}
}
else
m_strXMLContents="DocumentFailedtoload!";
//incaSEOfoverloaddataweusebefore,weshouldaddonebuttonforclearthedata(Readytotransfrom)
CStringCDemoDlg::DisplayXMLChildren(MSXML2::IXMLDOMNodePtrpParent)
//Displaycurrentnode'sname
//everyparent'snodenameisPOINT
CStringstrElement=((LPCTSTR)pParent->nodeName);//outputispoint
//looptogetdatapChild'sparentnodeispoint,andpoint'sparentnodeisroad
for(MSXML2::IXMLDOMNodePtrpChild=pParent->firstChild;pChild!=NULL;pChild=pChild->nextSibling)
//strElement+=((LPCTSTR)pChild->nodeName);
CStringnodeName=((LPCTSTR)pChild->nodeName);
CStringLon=_T("Lon");
CStringLan=_T("Lan");
CStringcurrentLon,currentLan;
if(nodeName==Lon)
currentLon=((LPCTSTR)pChild->text);
if(nodeName==Lan)
currentLan=((//addonepoint'sLonandLantomap
LonLanPoints.insert(currentLon,currentLan);
returnstrElement;
}