MFC reads XML files and parses

Now often the XML file to operate, how to read and parse XML files in MFC. Directly on the code:

First, wait for the stdafx.h to add this sentence to introduce the MSXML namespace

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

Then the header file of the class to use is added:

   XML Parser intellectural pointer (used in parsing XML file)

   Msxml2::ixmldomdocument2ptr   m_pldomdocument;
   Msxml2::ixmldomelementptr   M_pdocroot;

You then add initialization to the XML COM in the initialization function:

   Intianlize XML Parser COM 
   :: CoInitialize (NULL);
   HRESULT hr = m_pldomdocument.createinstance (msxml2::clsid_domdocument);
	
   if (FAILED (HR))
   {
	_com_error er (hr);
	AfxMessageBox (Er. ErrorMessage ());
	EndDialog (1);
   }

Then there are the specific functions:

void Cdemodlg::onbnclickedbuttonopenxml () {//At a, we should clear M_strxml ' s contents to show new data M_strxmlda

	Ta = "";
	CFileDialog Filedlg (TRUE);
		if (Idok = = Filedlg.domodal ()) {M_strxmlpath = Filedlg.getpathname ();

		m_strxmlcontents = "Empty document";

		Just in the case you don ' t get anything updatedata (FALSE);

		Specify XML file name CString strFileName = M_strxmlpath;
		Convert XML file name string to something COM can handle _bstr_t bstrfilename;

		Bstrfilename = Strfilename.allocsysstring ();
		Call the Ixmldomdocumentptr ' s load function to load XML file variant_t vresult;

		Vresult = M_pldomdocument->load (bstrfilename);  if ((bool) Vresult = = TRUE)//success {//convert BSTR to something your can use in VC + + _bstr_t =
			m_pldomdocument->xml;

			M_strxmlcontents = (LPCTSTR) bstrdoccontents;  Get XML data and show in Edit control msxml2::ixmldomnodeptr m_pxmlroot = m_pldomdocument->documentelement; The Child are point//m_strxmldata = _t (",") + Displayxmlchildren (m_pxmlroot); Loop to show get point ' s Lon and Lan and save in Map<cstring,cstring>lonlanpoints for (Msxml2::ixmldomnodeptr PC Hild = m_pxmlroot->firstchild; Pchild!= NULL; 
			pchild = pchild->nextsibling) {Displayxmlchildren (pchild);
		} else {m_strxmlcontents = "Document FAILED to load!";
	} updatedata (FALSE); }//in case of overload data "we use before", we should add one button for clear the data (Ready to Transfrom) CString CD  Emodlg::D isplayxmlchildren (msxml2::ixmldomnodeptr pparent) {//display current node ' s name//every Parent's node name is  Point CString strelement = ((LPCTSTR) pparent->nodename); The output is point//loop to get data pchild ' parent node are Point,and point ' s parent node is road for (msxml2::ixmldom Nodeptr pchild = pparent->firstchild; Pchild!= NULL;  
	pchild = pchild->nextsibling) {//strelement = = ((LPCTSTR) pchild->nodename);	CString nodename = ((LPCTSTR) pchild->nodename);
		CString Lon = _t ("Lon");
		CString lan = _t ("LAN");

		CString Currentlon,currentlan;
		if (nodename = = Lon) {Currentlon = ((LPCTSTR) pchild->text);
		} if (nodename = = Lan) {Currentlan = ((LPCTSTR) pchild->text);
	}//add one point ' s Lon and Lan to map Lonlanpoints.insert (Currentlon,currentlan);
return strelement; }

XML Structure:
<road>
<point>
    <id><id/>
    <Lon></Lon>
    <lat ></Lat>
</road>