The Apache project's Xerces-C
libraries support the DOM approach to XML parsing. The entire XML file is
imported into memory and the data is held as nodes in a data tree which can be
traversed for information.
So download the latest version of Xerces Library and place it into your
project folder.
The Xerces Library folder contains the following
files and folders inside it Shown in the picture .
Now make a new project or open your current project
and Right click your project and go to “project properties”. Now go to “VC++
directories” and then go to “Include directories” and give the path of the Xerces
Library include folder as shown in the picture below.
Now go to “VC++ directories” and then go to
“Library directories” and give the path of the Xerces Library lib folder as
shown in the picture below.
Now go to “Linker” -> “Input” and then go to
“Additional directories” and give the path of the Xerces Library file as shown
in the picture below.
Now write the following code to parse the
directories.
#include <iostream>
#include <xercesc/dom/DOM.hpp>
#include <xercesc/dom/DOMElement.hpp>
#include <xercesc/dom/DOMNode.hpp>
#include <xercesc/dom/DOMText.hpp>
#include
<xercesc/parsers/XercesDOMParser.hpp>
#include <xercesc/sax/HandlerBase.hpp>
using namespace std;
using namespace xercesc;
void write(DOMNode* node);
void writeElement(DOMElement* element);
void writeText(DOMText* text);
void
write(DOMNode* node) {
if (node) {
switch (node->getNodeType()) {
case DOMNode::ELEMENT_NODE:
writeElement(static_cast<DOMElement*>(node));
break;
case DOMNode::TEXT_NODE:
writeText(static_cast<DOMText*>(node));
break;
}
DOMNode* child = node->getFirstChild();
while (child) {
DOMNode* next = child->getNextSibling();
write(child);
child = next;
}
}
}
void
writeElement(DOMElement* element) {
char* name = XMLString::transcode(element->getTagName());
cout << "tag
: " << name << endl;
XMLString::release(&name);
DOMNamedNodeMap* map = element->getAttributes();
for (XMLSize_t i = 0; i < map->getLength(); i++) {
DOMAttr* attr = static_cast<DOMAttr*>(map->item(i));
char* attr_name = XMLString::transcode(attr->getName());
char* attr_value = XMLString::transcode(attr->getValue());
cout << attr_name << ": "<< attr_value << endl;
XMLString::release(&attr_name);
XMLString::release(&attr_value);
}
}
void
writeText(DOMText* text) {
XMLCh* buffer = new XMLCh[XMLString::stringLen(text->getData()) + 1];
XMLString::copyString(buffer, text->getData());
XMLString::trim(buffer);
char* content=XMLString::transcode(buffer);
delete[] buffer;
cout << "content: " << content << endl;
XMLString::release(&content);
}
int main(int argc, char* args[]) {
try {
XMLPlatformUtils::Initialize();
} catch (const XMLException& toCatch) {
char* message = XMLString::transcode(toCatch.getMessage());
cout << "Error during initialization! :\n" << message << "\n";
XMLString::release(&message);
return 1;
}
XercesDOMParser* parser = new XercesDOMParser();
parser->setValidationScheme(XercesDOMParser::Val_Always);
parser->setDoNamespaces(true); // optional
ErrorHandler* errHandler = (ErrorHandler*) new HandlerBase();
parser->setErrorHandler(errHandler);
const char* xmlFile = "samples/data/personal.xml";
try {
parser->parse(xmlFile);
DOMDocument* dom = parser->getDocument();
write(dom);
} catch (const XMLException& toCatch) {
char* message = XMLString::transcode(toCatch.getMessage());
cout << "Exception message is: \n" << message << "\n";
XMLString::release(&message);
return -1;
} catch (const DOMException& toCatch) {
char* message = XMLString::transcode(toCatch.msg);
cout << "Exception message is: \n" << message << "\n";
XMLString::release(&message);
return -1;
} catch (...) {
cout << "Unexpected Exception \n";
return -1;
}
delete parser;
delete errHandler;
return 0;
}
Compile:
• RPM installed: g++ -g -Wall -pedantic -lxerces-c parser.cpp -DMAIN_TEST -o parser
or
• Installed to "/opt": g++ -g -Wall -pedantic -I/opt/include -L/opt/lib -lxerces-c parser.cpp -DMAIN_TEST -o parser
Now Run the program..
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