xerces解析器的使用实例详解

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#include <stdio.h>#include <string.h>#include <stdlib.h>#include <xercesc/parsers/XercesDOMParser.hpp>  #include <xercesc/sax/SAXException.hpp>  #include <xercesc/dom/DOMException.hpp>#include <xercesc/dom/DOMLSOutput.hpp>#include <xercesc/dom/DOMElement.hpp>#include <xercesc/dom/DOMAttr.hpp>#include <xercesc/dom/DOMLSSerializerFilter.hpp>#include <xercesc/dom/DOMNodeList.hpp>#include <xercesc/dom/DOMDocument.hpp> #include <xercesc/dom/DOMLSException.hpp> #include <xercesc/parsers/SAXParser.hpp>#include <xercesc/dom/DOMLSSerializer.hpp>#include <xercesc/framework/MemBufInputSource.hpp>#include <xercesc/util/OutOfMemoryException.hpp>#include <xercesc/util/BinInputStream.hpp>#include <xercesc/util/TransService.hpp>#include <xercesc/dom/DOMLSParserFilter.hpp>#include <xercesc/dom/DOMImplementation.hpp>#include <xercesc/dom/DOMImplementationRegistry.hpp>#include <xercesc/framework/MemBufFormatTarget.hpp>#include <iostream>using namespace XERCES_CPP_NAMESPACE;using namespace std;static const char*  gMemBufId = "prodInfo";static char g_newNodeName[4][20]={"bal_ye","bal_ky","bal_kq","bal_dj"};static char  g_typeValue[4][10] = {"0","1","2","3"};extern "C" bool DoRecving(char* pDatabuf, int iLen,char* pNewBuf,int* iRetLen,int iNewLen);extern "C" void RemoveNode(DOMDocument* pDoc,DOMElement* tagNode);extern "C" void RemoveNode(DOMDocument* pDoc,DOMElement* tagNode){    if (tagNode == NULL|| pDoc == NULL)    {        return ;    }    DOMElement* newElementNode;    //DOMText* newTextNode;    DOMElement* typeNode = tagNode->getFirstElementChild();    DOMElement* balNode  = typeNode->getNextElementSibling();    char* typeValue = XMLString::transcode(typeNode->getTextContent());    for (int i=0;i<4;i++)    {        XMLCh* newNodeName = XMLString::transcode(g_newNodeName[i]);        if (strcmp(typeValue,g_typeValue[i])==0)        {            newElementNode=pDoc->createElement(newNodeName);            XMLString::release(&newNodeName);            break;        }        XMLString::release(&newNodeName);    }    DOMNode* parentNode = tagNode->getParentNode();    newElementNode->appendChild(typeNode);    newElementNode->appendChild(balNode);    parentNode->insertBefore(newElementNode,tagNode->getNextElementSibling());    parentNode->removeChild(tagNode);    return ;}extern "C" void Work(DOMDocument* pDoc,DOMElement * element){    while(element)    {        DOMElement* nextNode;        char* elementName =  XMLString::transcode(element->getTagName());        if (strcmp(elementName,"ScBal")==0)        {            nextNode = element->getNextElementSibling();            RemoveNode(pDoc,element);            element = nextNode;        }        else if(elementName,"MsgHdr")        {            DOMElement* elementChild = element->getFirstElementChild();            while(elementChild)            {                elementName =  XMLString::transcode(elementChild->getTagName());                if (strcmp(elementName,"InstrCd")==0)                {                    char* tranCode = XMLString::transcode(elementChild->getTextContent());                    if (strcmp(tranCode,"11008") != 0)                    {                        XMLString::release(&tranCode);                        return ;                    }                    else                    {                        break;                    }                }                elementChild = elementChild->getNextElementSibling();            }            element = element->getNextElementSibling();        }        else        {            element = element->getNextElementSibling();        }        XMLString::release(&elementName);    }}extern "C" DOMDocument* LoadMem(MemBufInputSource* pMemBufIS,XercesDOMParser* pParser,const char* pDatabuf){    MemBufInputSource* memBufIS = new MemBufInputSource        (        (const XMLByte*)pDatabuf        , strlen(pDatabuf)        , gMemBufId        , false        );    pMemBufIS = memBufIS;       XercesDOMParser* parser = new XercesDOMParser;    try    {        parser->parse(*memBufIS);    }    catch (SAXException& e)    {        printf("msg:%s\n", XMLString::transcode(e.getMessage()));        return NULL;    }    catch (XMLException& e)    {        printf("code:%d, msg:%s\n", e.getCode(), XMLString::transcode(e.getMessage()));        return NULL;    }    catch (DOMException& e)    {        printf("code:%d, msg:%s\n", e.code, e.msg);        return NULL;    }    DOMDocument* pDoc = NULL;    try    {        pDoc = parser->getDocument();        if(pDoc == NULL)        {            printf("pDoc fail \n");        }    }    catch (DOMLSException& e)    {        printf("code:%d, msg:%s\n", e.code, e.msg);        return NULL;    }    catch (DOMException& e)    {        printf("code:%d, msg:%s\n", e.code, e.msg);        return NULL;    }    return pDoc;}extern "C" bool DoRecving(char* pDatabuf, int iLen,char* pNewBuf,int* iRetLen,int iNewLen){     string  shead = "<?xml version=\"1.0\" encoding=\"GBK\"?>";    printf("\n%s\n",pDatabuf);    printf("%d",strlen(pDatabuf));    XMLPlatformUtils::Initialize();    MemBufInputSource* pMemBufIS = NULL;    XercesDOMParser*   pParser   = NULL;    DOMDocument* pDoc =LoadMem(pMemBufIS,pParser,pDatabuf);    DOMElement* root = pDoc->getDocumentElement();    if (root == NULL)    {        delete pMemBufIS;        delete pParser;        pMemBufIS = NULL;        pParser   = NULL;        shead.append(pDatabuf);        pDoc = LoadMem(pMemBufIS,pParser,shead.c_str());    }    root = pDoc->getDocumentElement();    if(root == NULL)    {        delete pMemBufIS;        delete pParser;        pMemBufIS = NULL;        pParser   = NULL;        return false;    }    DOMElement* firstNode = root->getFirstElementChild();    DOMElement* temNode = firstNode;    for (int i=0;i<2;i++)    {        temNode = temNode->getFirstElementChild();    }    Work(pDoc,temNode);    try    {        XMLCh tempStr[3] = { chLatin_L, chLatin_S, chNull };        DOMImplementation *impl = DOMImplementationRegistry::getDOMImplementation(tempStr);        DOMLSSerializer   *theSerializer = ((DOMImplementationLS*)impl)->createLSSerializer();        DOMLSOutput       *theOutputDesc = ((DOMImplementationLS*)impl)->createLSOutput();        //TranscodeToStr　transcodeToStr(theSerializer->writeToString(root),"gbk",XMLPlatformUtils::fgMemoryManager);            const char* gbk = "GBK";        char* data = (char*)TranscodeToStr(theSerializer->writeToString(root),gbk).adopt();        //        char datalen[10]={0};        //        int ndatalen = strlen(data);        printf("\nempty = %s\n",data);        printf("\n*******ndatalen = %d\n",ndatalen);        sprintf(datalen,"%05d",ndatalen);        firstNode = pDoc->getDocumentElement();        firstNode->setAttribute( XMLString::transcode("Len"),XMLString::transcode(datalen));        MemBufFormatTarget *myFormTarget;        myFormTarget = new MemBufFormatTarget(2000, XMLPlatformUtils::fgMemoryManager);        theOutputDesc->setByteStream(myFormTarget);        theSerializer->write(pDoc, theOutputDesc);              XMLFormatter *formatter = new XMLFormatter("gbk",myFormTarget);        const XMLByte* toWrite = new XMLByte[2000];        toWrite = myFormTarget->getRawBuffer();        memcpy(pNewBuf,toWrite,strlen((char*)toWrite));        *iRetLen = strlen(pNewBuf);        printf("\n====pNewBuf = %s\n",pNewBuf);        theOutputDesc->release();        theSerializer->release();        XMLString::release(&data);        delete formatter;        delete myFormTarget;    }    catch (const OutOfMemoryException&)    {        XERCES_STD_QUALIFIER cerr << "OutOfMemoryException" << XERCES_STD_QUALIFIER endl;        return false;    }    catch (XMLException& e)    {        XERCES_STD_QUALIFIER cerr << "An error occurred during creation of output transcoder. Msg is:"            << XERCES_STD_QUALIFIER endl            << XMLString::transcode(e.getMessage()) << XERCES_STD_QUALIFIER endl;        return false;    }    delete pMemBufIS;    delete pParser;    return true;}
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