MFC 解析XML

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：

MSXML2::IXMLDOMDocument2Ptrm_plDomDocument;
1. MSXML2::IXMLDOMElementPtrm_pDocRoot;

然后在初始化函数中加入对XML COM的初始化：

//intianlizeXMLParserCOM
1. ::CoInitialize(NULL);
2. HRESULThr=m_plDomDocument.CreateInstance(MSXML2::CLSID_DOMDocument);
4. if(FAILED(hr))
5. {
6. _com_errorer(hr);
7. AfxMessageBox(er.ErrorMessage());
8. EndDialog(1);
9. }

接着是具体的函数：

voidCDemoDlg::OnBnClickedButtonOpenxml()
1. //atfirst,weshouldclearm_strXML'scontentstoshownewdata
2. m_strXMLData="";
4. CFileDialogfileDlg(TRUE);
5. if(IDOK==fileDlg.DoModal())
6. m_strXMLPath=fileDlg.GetPathName();
7. m_strXMLContents="Emptydocument";
8. //justincaseyoudon'tgetanything
9. UpdateData(FALSE);
10. //SpecifyXMLfilename
11. CStringstrFileName=m_strXMLPath;
12. //ConvertXMLfilenamestringtosomethingCOMcanhandle
13. _bstr_tbstrFileName;
14. bstrFileName=strFileName.AllocSysString();
15. //CalltheIXMLDOMDocumentPtr'sloadfunctiontoloadXMLfile
16. variant_tvResult;
17. vResult=m_plDomDocument->load(bstrFileName);
18. if(((bool)vResult)==TRUE)//success
19. {
20. //ConvertbstrtosomethingyoucanuseinVC++
21. _bstr_tbstrDocContents=m_plDomDocument->xml;
22. m_strXMLContents=(LPCTSTR)bstrDocContents;
23. //getXMLdataandshowonEditControl
24. MSXML2::IXMLDOMNodePtrm_pXMLRoot=m_plDomDocument->documentElement;//firstchildispoint
25. //m_strXMLData=_T(",")+DisplayXMLChildren(m_pXMLRoot);
26. //looptoshowgetpoint'sLonandLanandsaveinmap<CString,CString>LonLanPoints
27. for(MSXML2::IXMLDOMNodePtrpChild=m_pXMLRoot->firstChild;pChild!=NULL;pChild=pChild->nextSibling)
28. DisplayXMLChildren(pChild);
29. }
30. }
31. else
32. m_strXMLContents="DocumentFAILEDtoload!";
33. //incaSEOfoverloaddataweusebefore,weshouldaddonebuttonforclearthedata(Readytotransfrom)
34. CStringCDemoDlg::DisplayXMLChildren(MSXML2::IXMLDOMNodePtrpParent)
35. //Displaycurrentnode'sname
36. //everyparent'snodenameisPOINT
37. CStringstrElement=((LPCTSTR)pParent->nodeName);//outputispoint
38. //looptogetdatapChild'sparentnodeispoint,andpoint'sparentnodeisroad
39. for(MSXML2::IXMLDOMNodePtrpChild=pParent->firstChild;pChild!=NULL;pChild=pChild->nextSibling)
40. //strElement+=((LPCTSTR)pChild->nodeName);
41. CStringnodeName=((LPCTSTR)pChild->nodeName);
42. CStringLon=_T("Lon");
43. CStringLan=_T("Lan");
44. CStringcurrentLon,currentLan;
45. if(nodeName==Lon)
46. currentLon=((LPCTSTR)pChild->text);
47. if(nodeName==Lan)
48. currentLan=((//addonepoint'sLonandLantomap
49. LonLanPoints.insert(currentLon,currentLan);
50. returnstrElement;
51. }

XML结构为：
1. <road>
2. point>
3. id>/>
4. Lon</Lat>

（编辑：李大同）

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