Using an XML Parser

1. Using an XML Parser

2. Objective • You will be able to use a publically available open source parser to convert an XML file into an internal data structure accessible by your C++ code.

3. Download Venue.xml • If you don't already have it, download file Venue.xml from the class web site. • http://www.cse.usf.edu/~turnerr/Object_Oriented_Design/Downloads/2011_03_28_XML/Venue.xml

4. tinyxml • http://www.grinninglizard.com/tinyxml/

5. Download from sourceforge http://sourceforge.net/projects/tinyxml/

6. Download from sourceforge

7. Extract

8. Getting Started • Create a new empty C++ console application. • test_venue_xml • Add new item test_venue.cpp • Start with Hello World. #include <iostream> using namespace std; int main() { cout << "This is venue_test\n"; cin.get(); cin.get(); return 0; }

9. Getting Started • Build and run.

10. Add Venue.xml • Copy file Venue.xml into your default directory. • Same directory as test_venue_xml.cpp

11. Copy Downloaded Source files • Copy tinyxml source files into the same directory and add to the project. • tinyxml.cpp, tinyxml.h, tinyxmlerror.cpp, tinyxmlparser.cpp

12. Add a #define to tinyxml.h

13. Start a Real Main #include <iostream> #include <cassert> #include <string> #include "tinyxml.h" using namespace std; int main() { cout << "This is venue_test\n"; string filename = "Venue.xml"; TiXmlDocument doc(filename); cin.get(); cin.get(); return 0; } Build and run.

14. Initial Test #include <iostream> #include <string> #include <cassert> #include "tinyxml.h" using namespace std; int main() { cout << "This is venue_test\n"; string filename = "Venue.xml"; TiXmlDocument doc(filename); bool loadOkay = doc.LoadFile(); if (!loadOkay) { cout << "Could not load file " << filename << endl; cout << "Error='" << doc.ErrorDesc() <<"'. Exiting.\n"; cin.get(); exit( 1 ); } cout << "Demo doc read from disk\n"; cout << "Printing via doc.Print \n"; doc.Print( stdout ); cin.get(); return 0; }

15. Initial Test Run

16. Initial Test Run (continued)

17. Venue.xml

18. Venue.xml DOM Document venue_file venue ... seat_row seat_row name seat_row address The Little Theater name seat number section A 1 Front state zip_code city street 01420 MA 145 Main Street Littleton

19. Looking at Nodes in the DOM • At end of main(): //cout << "Printing via doc.Print \n"; //doc.Print( stdout ); TiXmlNode* venue_file_node = doc.FirstChild("venue_file"); assert(venue_file_node != 0); cout << venue_file_node->Value() << endl; cin.get(); return 0; }

20. The First Node

21. Navigating the DOM TiXmlNode* venue_file_node = doc.FirstChild("venue_file"); assert(venue_file_node != 0); cout << venue_file_node->Value() << endl; TiXmlNode* venue_node = venue_file_node->FirstChild(); assert(venue_node != 0); cout << venue_node->Value() << endl; cin.get(); return 0; }

22. Second Node

23. More Nodes TiXmlNode* venue_file_node = doc.FirstChild("venue_file"); assert(venue_file_node != 0); cout << venue_file_node->Value() << endl; TiXmlNode* venue_node = venue_file_node->FirstChild(); assert(venue_node != 0); cout << venue_node->Value() << endl; TiXmlNode* name_node = venue_node->FirstChild(); assert(name_node != 0); cout << name_node->Value() << endl; cin.get(); return 0; }

24. More Nodes

25. A Text Value TiXmlNode* venue_file_node = doc.FirstChild("venue_file"); assert(venue_file_node != 0); cout << venue_file_node->Value() << endl; TiXmlNode* venue_node = venue_file_node->FirstChild(); assert(venue_node != 0); cout << venue_node->Value() << endl; TiXmlNode* name_node = venue_node->FirstChild(); assert(name_node != 0); cout << name_node->Value() << endl; TiXmlNode* name_text_node = name_node->FirstChild(); assert(name_text_node != 0); cout << name_text_node->Value() << endl; cin.get(); return 0; }

26. A Text Value

27. Conclusion • We can use the tinyxml api to navigate the DOM. • Get to any node. • Retrieve its data.