XML Parsing in C

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XML Parsing in C

• Why .NET is worth it

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Introduction

• C was designed around the .NET platform for
• Similarity to C
• Safety and ease of use
• True OOP structure
• Interoperability with other languages
  (instantiate a C class in C)
• Allowing existing code to be used (ie COM
  objects, DLLs)

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Introduction

• What languages influenced its creation?
• Visual Basic (Rapid App Dev capabilities)
• Java (Type-safe Ref Modeling)
• C (Power inherited from C)
• Smalltalk (true object-oriented structure)
• along with a number of predecessors

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The .NET Framework

• Base Class Library containing hundreds of classes
• Contains underlying object-oriented principles as
  well as assembly technology
• All classes are based on one specific class in
  the BCL

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Basic C

• Namespaces used instead of include or import
  calls
• using System
• using System.IO
• using System.Xml
• This acts as a container for underlying classes,
  such as Console, XML parsing functions
• Console.WriteLine(It is called Mario Twins)
• XmlDocument xmlDoc new XmlDocument()

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C Code Structure

• using System // Include the namespace
• public class SampleCode // Create your first
  class
• public static void Main() // Main declared
  within the class
• int x, y
• Console.Write(Enter two numbers ) // Write
  text
• x Convert.ToInt32(Console.ReadLine()) //
  Convert input to int
• y Convert.ToInt32(Console.ReadLine())
• Console.WriteLine(The sum is Sum(x,y)) //
  Write text vars
• public static int Sum(int a, int b)
• return(a b)
• // End of class

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C OOP Structure

• OOP structure almost identical to C in terms of
  classes, structs
• Just like C, it contains private and public
  member variables and functions
• The Main() is placed in one of the classes, and
  the compiler enters runtime via this function
• Namespaces can be used to contain classes for
  organization

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XML Parsing Features

• Using the System.Xml namespace,
• XmlDocument xmlDoc // Our XML doc to
  be loaded
• XmlTextWriter writer // The stream well
  used to write out the results
• xmlDoc.Load(_at_courselist.xml) // Load
  the doc
• writeFileName myCourse.getCrsNum() .xml
• writer new XmlTextWriter(writeFileName,
  null) // Open the
• output file
• writer.WriteStartElement(courseinfo) //
  Write an XML element
• writer.WriteElementString(coursename, //
  Write the inner
• myCourse.courseName) // elements
• writer.WriteEndElement() // Close the element
  (well-formed)

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More XML Parsing Goodness

• Throw in a few more namespaces for an even better
  time
• System.Xml.XPath allows a DOM tree to be parsed
  node by node, and even searched by level of
  indentation
• System.Xml.Xsl allows a program to load an .xsl
  for styling, and then output everything to .xml

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More XML Parsing Features

• With the System.Xml.XPath namespace tacked on,
• XmlNodeList xmlNodes
• xmlDoc.Load(_at_courselist.xml)
• xmlNodes xmlDoc.SelectNodes(//courselist/cours
  e) // Select all
• individual class elements
• if(xmlNodes.Count gt 0)
• foreach(XmlNode myNode in xmlNodes)
• if(myNode.Type Element)
• myName myNodecoursename.InnerText
• myNum myNodecoursenum.InnerText
• myInstr myNodeinstructor.InnerText
• Course temp new Course(myName, )

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Questions?