Xerces中構造xml很簡單,但是想輸出就很麻煩,Xerces支援三種輸出 輸出到記憶體
輸出到標準輸出 輸出到本地檔案
下面列出用到的一些重要的類,可以查詢官網API解鎖更多的用法

1.DOMImplementation和DOMImplementationLS這兩貨是DOM界的造物者,如果你發現你有構造不了的類,查詢這兩貨的API就可以啦,比如
DOMDoument DOMLSSerializer
2.DOMLSOutput獲得輸出的控制代碼,通過與輸出目標繫結 正如上面提及的 MemBufFormatTarget StdOutFormatTarget LocalFileFormatTarget，此外還可以設定輸出的編碼方式等行為
3.DOMLSSerializer 序列化DOMDocument控制代碼和輸出控制代碼,使得二者相關聯

下面來看看例子吧,解鎖它的用法

#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/dom/DOM.hpp>
#include <iostream>
#include <xercesc/framework/LocalFileFormatTarget.hpp>

#define Transcode_1(x)  XMLString::transcode(x)
#define Transcode_3(x,y,z) XMLString::transcode(x,y,z)

using namespace
 
 xercesc;

int main()
{
    try 
    {
        XMLPlatformUtils::Initialize();
    }
    catch (const XMLException& toCatch)
    {
        std::cerr << Transcode_1(toCatch.getMessage());
    }
    try 
    {
        DOMImplementation* imp = DOMImplementationRegistry::getDOMImplementation(Transcode_1("Core"
 
));
        DOMDocument* doc = imp->createDocument(0,Transcode_1("root"),0);

        DOMElement* node = doc->createElement(Transcode_1("node1"));
        node->setAttribute(Transcode_1("name"),Transcode_1("node1"));
        node->setTextContent(Transcode_1("node1"));

        DOMElement* root = doc->getDocumentElement();
        root->appendChild(node);

        DOMElement* node2 = doc->createElement(Transcode_1("node2"));
        node2->setAttribute(Transcode_1("name"),Transcode_1("node2"));
        node2->setTextContent(Transcode_1("node2"));

        root->appendChild(node2);

        DOMElement* node2_1 = doc->createElement(Transcode_1("node2_1"));
        node2_1->setAttribute(Transcode_1("name"),Transcode_1("node2_1"));
        node2_1->setTextContent(Transcode_1("node2_1"));
        node2->appendChild(node2_1);

        DOMLSOutput* output = dynamic_cast<DOMImplementationLS*>(imp)->createLSOutput();
        DOMLSSerializer* serial = dynamic_cast<DOMImplementationLS*>(imp)->createLSSerializer();
        XMLFormatTarget* target = new LocalFileFormatTarget("2.xml");
        output->setByteStream(target);
        serial->write(doc,output);
        doc->release();
        serial->release();
        delete target;
    }
    catch (const DOMException& toCatch)
    {
        std::cerr << Transcode_1(toCatch.getMessage());
    }
    return 0;
}