mirror of https://github.com/davisking/dlib.git
116 lines
3.0 KiB
C++
116 lines
3.0 KiB
C++
// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
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/*
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This is an example illustrating the use of the xml_parser component in
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the dlib C++ Library.
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This example simply reads in an xml file and prints the parsing events
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to the screen.
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*/
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#include "dlib/xml_parser.h"
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#include <iostream>
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#include <fstream>
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using namespace std;
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using namespace dlib;
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// ----------------------------------------------------------------------------------------
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class doc_handler : public document_handler
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{
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/*
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As the parser runs it generates events when it encounters tags and
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data in an XML file. To be able to receive these events all you have to
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do is make a class that inherits from dlib::document_handler and
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implements its virtual methods. Then you simply associate an
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instance of your class with the xml_parser.
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So this class is a simple example document handler that just prints
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all the events to the screen.
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*/
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public:
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virtual void start_document (
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)
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{
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cout << "parsing begins" << endl;
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}
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virtual void end_document (
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)
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{
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cout << "Parsing done" << endl;
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}
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virtual void start_element (
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const unsigned long line_number,
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const std::string& name,
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const dlib::attribute_list& atts
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)
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{
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cout << "on line " << line_number << " we hit the <" << name << "> tag" << endl;
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// print all the tag's attributes
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atts.reset();
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while (atts.move_next())
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{
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cout << "\tattribute: " << atts.element().key() << " = " << atts.element().value() << endl;
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}
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}
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virtual void end_element (
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const unsigned long line_number,
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const std::string& name
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)
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{
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cout << "on line " << line_number << " we hit the closing tag </" << name << ">" << endl;
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}
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virtual void characters (
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const std::string& data
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)
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{
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cout << "Got some data between tags and it is:\n" << data << endl;
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}
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virtual void processing_instruction (
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const unsigned long line_number,
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const std::string& target,
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const std::string& data
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)
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{
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cout << "on line " << line_number << " we hit a processing instruction with a target of '"
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<< target << "' and data '" << data << "'" << endl;
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}
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};
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// ----------------------------------------------------------------------------------------
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int main(int argc, char** argv)
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{
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try
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{
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// Check if the user entered an argument to this application.
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if (argc != 2)
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{
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cout << "Please enter an xml file to parse on the command line" << endl;
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return 1;
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}
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doc_handler dh;
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// Now run the parser and tell it to call our doc_handler for each of the parsing
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// events.
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parse_xml(argv[1], dh);
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}
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catch (std::exception& e)
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{
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cout << e.what() << endl;
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}
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}
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