【原創】C++利用IXMLDOM解析XML檔案。

項目是在wince平台下做的，但是解析過程和代碼卻別不大，貼出代碼，留做備份。

// TestIXML.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include <windows.h>#include <comutil.h>#include <stdlib.h>#include <stdio.h>#include <MsXml2.h>#pragma comment(lib, "ole32.lib")#pragma comment(lib, "oleaut32.lib")void TestXML();void TestSound();#define TIROSLIB_DBG_FILE "\\Test_Pro.log"void dbgprintf(const char *str, ...){va_list ap;FILE *fh = NULL;if(fh = fopen(TIROSLIB_DBG_FILE, "a")){va_start(ap, str);vfprintf(fh, str, ap);fprintf(fh, "\n");va_end(ap);fclose(fh);fh = NULL;}}typedef struct _weather_info_node{char szDate[32];char szCondition[5];char szWind[32];float fLowTemp;float fHighTemp;int nReserved;struct _weather_info_node *lpNext;}weather_info_node;weather_info_node *m_lpWeatherNode = NULL;weather_info_node *NewWeatherNode(){weather_info_node *newNode = (weather_info_node *)malloc(sizeof(weather_info_node));memset(newNode, 0, sizeof(weather_info_node));newNode->lpNext = NULL;return newNode;}void DestoryWeatherList(weather_info_node **weatherList){weather_info_node *DElem, *next;DElem = *weatherList;while(DElem){next = DElem->lpNext;free(DElem);DElem = next;     }*weatherList = NULL;}BOOL ParseWeatherXml(const char *lpXmlPath){//xml節點名的枚舉enum node_Names{xml_day, xml_low, xml_high, xml_condition, xml_wind};IXMLDOMDocument *pXMLDocument= NULL;IXMLDOMNode *pNode = NULL;IXMLDOMNodeList *pNodeList = NULL;IXMLDOMNodeList *pChildNodeList = NULL;IXMLDOMParseError * pObjError = NULL;IXMLDOMNamedNodeMap *pNodeMap = NULL;//DOMNodeType nodeType;VARIANT vXmlPath;VARIANT vValue;VARIANT_BOOL vbStatus;BSTR bstr = NULL;long lLength = 0;weather_info_node *lpTemp = NULL;int nLen = strlen(lpXmlPath) + 1; int nwLen  = MultiByteToWideChar(CP_ACP, 0, lpXmlPath, nLen, NULL, 0); TCHAR lpSzXmlPath[256]; MultiByteToWideChar(CP_ACP, 0, lpXmlPath, nLen, lpSzXmlPath, nwLen); VariantInit(&vXmlPath);V_BSTR(&vXmlPath) = SysAllocString(lpSzXmlPath);V_VT(&vXmlPath) = VT_BSTR;CoInitializeEx(NULL, COINIT_MULTITHREADED);HRESULT hr  = CoCreateInstance(CLSID_DOMDocument, NULL, CLSCTX_INPROC_SERVER, IID_IXMLDOMDocument2,(void**)&pXMLDocument);hr = pXMLDocument->put_async(VARIANT_FALSE);if (FAILED(hr)) {printf("Failed to set async property\n");}hr = pXMLDocument->put_validateOnParse(VARIANT_FALSE);if (FAILED(hr)){printf("Failed to set validateOnParse\n");}hr = pXMLDocument->put_resolveExternals(VARIANT_FALSE);if (FAILED(hr)){printf("Failed to disable resolving externals.\n");}hr = pXMLDocument->load(vXmlPath, &vbStatus);if (vbStatus != VARIANT_TRUE) {hr = pXMLDocument->get_parseError(&pObjError);hr = pObjError->get_reason(&bstr);printf("Failed to load DOM from books.xml. %S\n",bstr);}hr = pXMLDocument->get_xml(&bstr);if(FAILED(hr)){printf("xml 的內容:\n%S\n", bstr);SysFreeString(bstr);}hr = pXMLDocument->selectSingleNode(L"//weather", &pNode);//hr = pNode->get_nodeName(&bstr);hr = pNode->get_childNodes(&pNodeList);hr = pNodeList->get_length(&lLength);for (int nIndex = 0; nIndex != lLength; ++nIndex){if (0 == nIndex){m_lpWeatherNode = NewWeatherNode();lpTemp = m_lpWeatherNode;}else{lpTemp->lpNext = NewWeatherNode();lpTemp = lpTemp->lpNext;}hr = pNodeList->get_item(nIndex, &pNode);hr = pNode->get_childNodes(&pChildNodeList);long lChildLength = 0;hr = pChildNodeList->get_length(&lChildLength);for (int nChildIndex = 0; nChildIndex != lChildLength; ++nChildIndex){//hr = pNode->get_nodeName(&bstr);switch(nChildIndex){case xml_day:hr = pChildNodeList->get_item(nChildIndex, &pNode);hr = pNode->get_attributes(&pNodeMap);hr = pNodeMap->get_item(0, &pNode);hr = pNode->get_nodeTypedValue(&vValue);memcpy(lpTemp->szDate, (char *)(_bstr_t)vValue.bstrVal, strlen((char *)(_bstr_t)vValue.bstrVal));break;case xml_low:hr = pChildNodeList->get_item(nChildIndex, &pNode);hr = pNode->get_attributes(&pNodeMap);hr = pNodeMap->get_item(0, &pNode);hr = pNode->get_nodeTypedValue(&vValue);lpTemp->fLowTemp = atof((char *)(_bstr_t)vValue.bstrVal);break;case xml_high:hr = pChildNodeList->get_item(nChildIndex, &pNode);hr = pNode->get_attributes(&pNodeMap);hr = pNodeMap->get_item(0, &pNode);hr = pNode->get_nodeTypedValue(&vValue);lpTemp->fHighTemp = atof((char *)(_bstr_t)vValue.bstrVal);break;case xml_condition:hr = pChildNodeList->get_item(nChildIndex, &pNode);hr = pNode->get_attributes(&pNodeMap);hr = pNodeMap->get_item(0, &pNode);hr = pNode->get_nodeTypedValue(&vValue);memcpy(lpTemp->szCondition, (char *)(_bstr_t)vValue.bstrVal, strlen((char *)(_bstr_t)vValue.bstrVal));break;case xml_wind:hr = pChildNodeList->get_item(nChildIndex, &pNode);hr = pNode->get_attributes(&pNodeMap);hr = pNodeMap->get_item(0, &pNode);hr = pNode->get_nodeTypedValue(&vValue);memcpy(lpTemp->szWind, (char *)(_bstr_t)vValue.bstrVal, strlen((char *)(_bstr_t)vValue.bstrVal));break;default:break;}}}pChildNodeList->Release();pNodeMap->Release();pNodeList->Release();pNode->Release();pXMLDocument->Release();/*hr = pNodeList->get_item(3,&pNode);hr = pNode->get_attributes(&pMap);hr = pMap->get_item(0, &pNode);hr = pNode->get_nodeTypedValue(&vValue);*/return TRUE;}void TestMyXml(){char *lpTempPath = "\\Storage Card\\WeatherXML20101122150441.txt";ParseWeatherXml(lpTempPath);while(m_lpWeatherNode != NULL){dbgprintf("Date = %s,Low = %f, High = %f, Condition = %s, Wind = %s", m_lpWeatherNode->szDate, m_lpWeatherNode->fLowTemp, m_lpWeatherNode->fHighTemp, m_lpWeatherNode->szCondition, m_lpWeatherNode->szWind);m_lpWeatherNode = m_lpWeatherNode->lpNext;}}int _tmain(int argc, _TCHAR* argv[]){TestMyXml();//TestXML();return 0;}void TestXML(){IXMLDOMDocument *pXMLDocument= NULL;IXMLDOMNode *pNode = NULL;IXMLDOMNodeList *pNodeList = NULL;IXMLDOMParseError * pObjError = NULL;DOMNodeType nodeType;IXMLDOMNamedNodeMap *pMap = NULL;VARIANT v1;VARIANT variantvalue;VARIANT_BOOL status;BSTR bstr = NULL;VariantInit(&v1);V_BSTR(&v1) = SysAllocString(L"D:\\WeatherXML20101122150441.txt");V_VT(&v1) = VT_BSTR;// 首先必須調用CoInitializeCoInitializeEx(NULL, COINIT_MULTITHREADED);// 建立一msxml 文檔執行個體，返回IXMLDOMDocument2介面。HRESULT hr  = CoCreateInstance(CLSID_DOMDocument, NULL, CLSCTX_INPROC_SERVER, IID_IXMLDOMDocument2,(void**)&pXMLDocument);hr = pXMLDocument->put_async(VARIANT_FALSE);if (FAILED(hr)) {printf("Failed to set async property\n");//goto clean;}hr = pXMLDocument->put_validateOnParse(VARIANT_FALSE);if (FAILED(hr)) {printf("Failed to set validateOnParse\n");//goto clean;}hr = pXMLDocument->put_resolveExternals(VARIANT_FALSE);if (FAILED(hr)) {printf("Failed to disable resolving externals.\n");//goto clean;}hr = pXMLDocument->load(v1, &status);if (status!=VARIANT_TRUE) {hr = pXMLDocument->get_parseError(&pObjError);hr = pObjError->get_reason(&bstr);printf("Failed to load DOM from books.xml. %S\n",bstr);//goto clean;}hr = pXMLDocument->get_xml(&bstr);printf("foo.xml 的內容:\n%S\n", bstr);SysFreeString(bstr);hr = pXMLDocument->selectSingleNode(L"//fc", &pNode);hr = pNode->get_nodeName(&bstr);hr = pNode->get_childNodes(&pNodeList);long length;hr = pNodeList->get_length(&length);hr = pNodeList->get_item(3,&pNode);hr = pNode->get_attributes(&pMap);hr = pMap->get_item(0, &pNode);hr = pNode->get_nodeTypedValue(&variantvalue);//hr = pNode->get_childNodes(&pNodeList);//hr = pNodeList->get_item(0, &pNode);//hr = pNode->get_nodeType(&nodeType);//hr = pNode->get_nodeValue(&variantvalue);//hr = pNode->get_dataType(&variantvalue);//hr = pNode->get_xml(&bstr);//hr = pNode->get_nodeType(&nodeType);//variantvalue.vt = nodeType;//hr = pNode->get_dataType(&variantvalue);//hr = pNode->get_nodeValue(&variantvalue);//hr = pNode->get_nodeTypedValue(&variantvalue);// hr = pNode->get_// if (FAILED(hr)) {// hr = pXMLDocument->get_parseError(&pObjError);// hr = pObjError->get_reason(&bstr);// printf("Failed to load DOM from books.xml. %S\n",bstr);// //goto clean;// }//hr = pNode->get_nodeName(&bstr);//DOMNodeType nodeType; //得到節點類型 //pNode->get_nodeType(&nodeType); //節點名稱 // // BSTR nodeName;// // hr = pNode->get_nodeName(&nodeName);// // char *cNodeName = (char *)nodeName;//cNodeName = ConvertBSTRToString(nodeName);//strName=(char *)pNode->GetnodeName();//節點屬性,放在鏈表中 // MSXML2::IXMLDOMNamedNodeMapPtr pAttrMap=NULL;// MSXML2::IXMLDOMNodePtr   pAttrItem;// _variant_t variantvalue;// pNode->get_attributes(&pAttrMap);// // long count;// count=pAttrMap->get_length(&count);// // pAttrMap->get_item(0,&pAttrItem);// //取得節點的值// pAttrItem->get_nodeTypedvalue(&variantvalue);// m_strId=(char *)(_bstr_t)variantvalue;// // UpdateData(FALSE);//hr = pXMLDocument->getProperty(L"<day data/>", &v2);//hr = pXMLDocument->save(v1);//pXMLDocument->Release();CoUninitialize();}

xml檔案：

<weather pd="2010-11-22 08:00:00" xmlns="http://www.xxx.com">  <fc>    <day data="2010-11-22 08:00:00"/>    <low data="-2.0"/>    <high data="9.0"/>    <condition data="晴"/>    <wind data="靜風、小於3級"/>    <indexes>      <index type="3" data="6"/>      <index type="4" data="6"/>      <index type="1" data="1"/>      <index type="2" data="2"/>    </indexes>  </fc>  <fc>    <day data="2010-11-23 08:00:00"/>    <low data="1.0"/>    <high data="9.0"/>    <condition data="陰"/>    <wind data="靜風、小於3級"/>  </fc>  <fc>    <day data="2010-11-24 08:00:00"/>    <low data="-4.0"/>    <high data="6.0"/>    <condition data="晴"/>    <wind data="北風轉靜風、3級轉小於3級"/>  </fc></weather>