利用DOM生成XML文档

// XMLWriter.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include <xercesc/util/PlatformUtils.hpp>#include <xercesc/util/PlatformUtils.hpp>#include <xercesc/dom/DOM.hpp>#include <xercesc/framework/StdOutFormatTarget.hpp>#include <xercesc/framework/LocalFileFormatTarget.hpp>#include <xercesc/parsers/XercesDOMParser.hpp>#include <xercesc/util/XMLUni.hpp>#include <..\\samples\\src\\DOMPrint\\DOMTreeErrorReporter.hpp>//#include <DOMPrintFilter.hpp>#include <..\\samples\\src\\DOMPrint\\DOMPrintErrorHandler.hpp>#include <xercesc/util/OutOfMemoryException.hpp>#include <string.h>#include <stdlib.h>#include <xercesc/util/XMLString.hpp>#include <stdio.h>#if defined(XERCES_NEW_IOSTREAMS)#include <iostream>#else #include <iostream.h>#endif#pragma comment(lib, "xerces-c_3D")XERCES_CPP_NAMESPACE_USE// ---------------------------------------------------------------------------//  This is a simple class that lets us do easy (though not terribly efficient)//  trancoding of char* data to XMLCh data.// ---------------------------------------------------------------------------class XStr{public :// -----------------------------------------------------------------------//  Constructors and Destructor// -----------------------------------------------------------------------XStr(const char* const toTranscode){// Call the private transcoding methodfUnicodeForm = XMLString::transcode(toTranscode);}~XStr(){XMLString::release(&fUnicodeForm);}// -----------------------------------------------------------------------//  Getter methods// -----------------------------------------------------------------------const XMLCh* unicodeForm() const{return fUnicodeForm;}private :// -----------------------------------------------------------------------//  Private data members////  fUnicodeForm//      This is the Unicode XMLCh format of the string.// -----------------------------------------------------------------------XMLCh*   fUnicodeForm;};#define X(str) XStr(str).unicodeForm()static char* goutputfile = "d:\\ok.xml";void WriteXML(DOMDocument *doc, int &retval );int _tmain(int argc, _TCHAR* argv[]){    // Initialize the XML4C2 system.int errorCode = 0;try{XMLPlatformUtils::Initialize();}catch(const XMLException& toCatch){char *pMsg = XMLString::transcode(toCatch.getMessage());XERCES_STD_QUALIFIER cerr << "Error during Xerces-c Initialization.\n"<< "  Exception message:"<< pMsg;XMLString::release(&pMsg);return 1;}{//  Nest entire test in an inner block.//  The tree we create below is the same that the XercesDOMParser would//  have created, except that no whitespace text nodes would be created.// <company>//     <product>Xerces-C</product>//     <category idea='great'>XML Parsing Tools</category>//     <developedBy>Apache Software Foundation</developedBy>// </company>DOMImplementation* impl =  DOMImplementationRegistry::getDOMImplementation(X("Core"));//if (impl != NULL){try{DOMDocument* doc = impl->createDocument(0,                    // root element namespace URI.X("company"),         // root element name0);                   // document type object (DTD)./*doc->*/DOMElement* rootElem = doc->getDocumentElement();DOMElement*  prodElem = doc->createElement(X("product"));rootElem->appendChild(prodElem);DOMText*    prodDataVal = doc->createTextNode(X("Xerces-C"));prodElem->appendChild(prodDataVal);DOMElement*  catElem = doc->createElement(X("category"));rootElem->appendChild(catElem);catElem->setAttribute(X("idea"), X("great"));catElem->setAttribute(X("xuehao"), X("123"));DOMText*    catDataVal = doc->createTextNode(X("XML Parsing Tools"));catElem->appendChild(catDataVal);DOMElement*  devByElem = doc->createElement(X("developedBy"));rootElem->appendChild(devByElem);DOMText*    devByDataVal = doc->createTextNode(X("Apache Software Foundation"));devByElem->appendChild(devByDataVal);//// Now count the number of elements in the above DOM tree.//const XMLSize_t elementCount = doc->getElementsByTagName(X("*"))->getLength();//XERCES_STD_QUALIFIER cout << "The tree just created contains: " << elementCount<< " elements." << XERCES_STD_QUALIFIER endl;int ret = 0;WriteXML(doc,ret);doc->release();}catch (const OutOfMemoryException&){XERCES_STD_QUALIFIER cerr << "OutOfMemoryException" << XERCES_STD_QUALIFIER endl;errorCode = 5;}catch (const DOMException& e){XERCES_STD_QUALIFIER cerr << "DOMException code is:  " << e.code << XERCES_STD_QUALIFIER endl;errorCode = 2;}catch (...){XERCES_STD_QUALIFIER cerr << "An error occurred creating the document" << XERCES_STD_QUALIFIER endl;errorCode = 3;}}  // (inpl != NULL)else{XERCES_STD_QUALIFIER cerr << "Requested implementation is not supported" << XERCES_STD_QUALIFIER endl;errorCode = 4;}}XMLPlatformUtils::Terminate();return errorCode;}void WriteXML(/* DOMPrintFilter * &myFilter, XercesDOMParser * parser,*/DOMDocument *doc, int &retval ) {try{// get a serializer, an instance of DOMLSSerializerXMLCh tempStr[3] = {chLatin_L, chLatin_S, chNull};DOMImplementation *impl          = DOMImplementationRegistry::getDOMImplementation(tempStr);DOMLSSerializer   *theSerializer = ((DOMImplementationLS*)impl)->createLSSerializer();DOMLSOutput       *theOutputDesc = ((DOMImplementationLS*)impl)->createLSOutput();// set user specified output encoding//theOutputDesc->setEncoding(gOutputEncoding);// plug in user's own filter//if (gUseFilter)//{//// even we say to show attribute, but the DOMLSSerializer//// will not show attribute nodes to the filter as//// the specs explicitly says that DOMLSSerializer shall//// NOT show attributes to DOMLSSerializerFilter.//////// so DOMNodeFilter::SHOW_ATTRIBUTE has no effect.//// same DOMNodeFilter::SHOW_DOCUMENT_TYPE, no effect.//////myFilter = new DOMPrintFilter(DOMNodeFilter::SHOW_ELEMENT   |//DOMNodeFilter::SHOW_ATTRIBUTE |//DOMNodeFilter::SHOW_DOCUMENT_TYPE);//theSerializer->setFilter(myFilter);//}// plug in user's own error handlerDOMErrorHandler *myErrorHandler = new DOMPrintErrorHandler();DOMConfiguration* serializerConfig=theSerializer->getDomConfig();//serializerConfig->setParameter(XMLUni::fgDOMErrorHandler, myErrorHandler);// set feature if the serializer supports the feature/mode/*if (serializerConfig->canSetParameter(XMLUni::fgDOMWRTSplitCdataSections, gSplitCdataSections))serializerConfig->setParameter(XMLUni::fgDOMWRTSplitCdataSections, gSplitCdataSections);if (serializerConfig->canSetParameter(XMLUni::fgDOMWRTDiscardDefaultContent, gDiscardDefaultContent))serializerConfig->setParameter(XMLUni::fgDOMWRTDiscardDefaultContent, gDiscardDefaultContent);if (serializerConfig->canSetParameter(XMLUni::fgDOMWRTFormatPrettyPrint, gFormatPrettyPrint))serializerConfig->setParameter(XMLUni::fgDOMWRTFormatPrettyPrint, gFormatPrettyPrint);if (serializerConfig->canSetParameter(XMLUni::fgDOMWRTBOM, gWriteBOM))serializerConfig->setParameter(XMLUni::fgDOMWRTBOM, gWriteBOM);*///// Plug in a format target to receive the resultant// XML stream from the serializer.//// StdOutFormatTarget prints the resultant XML stream// to stdout once it receives any thing from the serializer.//XMLFormatTarget *myFormTarget;if (goutputfile)myFormTarget=new LocalFileFormatTarget(goutputfile);elsemyFormTarget=new StdOutFormatTarget();theOutputDesc->setByteStream(myFormTarget);// get the DOM representation//DOMDocument *doc = parser->getDocument();//// do the serialization through DOMLSSerializer::write();///*if(gXPathExpression!=NULL){XMLCh* xpathStr=XMLString::transcode(gXPathExpression);DOMElement* root = doc->getDocumentElement();try{DOMXPathNSResolver* resolver=doc->createNSResolver(root);DOMXPathResult* result=doc->evaluate(xpathStr,root,resolver,DOMXPathResult::ORDERED_NODE_SNAPSHOT_TYPE,NULL);XMLSize_t nLength = result->getSnapshotLength();for(XMLSize_t i = 0; i < nLength; i++){result->snapshotItem(i);theSerializer->write(result->getNodeValue(), theOutputDesc);}result->release();resolver->release ();}catch(const DOMXPathException& e){XERCES_STD_QUALIFIER cerr << "An error occurred during processing of the XPath expression. Msg is:"<< XERCES_STD_QUALIFIER endl<< StrX(e.getMessage()) << XERCES_STD_QUALIFIER endl;retval = 4;}catch(const DOMException& e){XERCES_STD_QUALIFIER cerr << "An error occurred during processing of the XPath expression. Msg is:"<< XERCES_STD_QUALIFIER endl<< StrX(e.getMessage()) << XERCES_STD_QUALIFIER endl;retval = 4;}XMLString::release(&xpathStr);}else*/theSerializer->write(doc, theOutputDesc);theOutputDesc->release();theSerializer->release();//// Filter, formatTarget and error handler// are NOT owned by the serializer.//delete myFormTarget;//delete myErrorHandler;//if (gUseFilter)//delete myFilter;}catch (const OutOfMemoryException&){XERCES_STD_QUALIFIER cerr << "OutOfMemoryException" << XERCES_STD_QUALIFIER endl;retval = 5;}catch (XMLException& e){//XERCES_STD_QUALIFIER cerr << "An error occurred during creation of output transcoder. Msg is:"//<< XERCES_STD_QUALIFIER endl//<< StrX(e.getMessage()) << XERCES_STD_QUALIFIER endl;retval = 4;}}