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Creating an XML File
 

Techniques
 

Introduction

Due to the high level of support of XML in the Microsoft .NET Framework, there are various ways you can create an XML file that would be used in Visual C++ .NET. The most common technique consists of using a simple text editor. In Microsoft Windows, this would be Notepad, or even WordPad. An XML file is first of all a normal text-based document that has a .xml extension. Therefore, however you create it, it must have that extension.

Many other applications allow creating an XML file or generating one from an existing file. There are also commercial editors you can acquire to create an XML file.
 

Practical Learning Practical Learning: Introducing XML
  • Start Microsoft Visual Studio .NET and create a Windows Forms Application named CPAP1

Creating an XML File With a Text Editor

Probably the most common way to create an XML file in Microsoft Windows consists of using Notepad or any other text editor. After opening the text editor, you can enter the necessary lines of code. After creating the file, you must save it. When saving it, you can include the name of the file in double-quotes. Here is an example:

Save As

You can also first set the Files Of Type combo box to All Files and then enter the name of the file with the .xml extension
 

Creating an XML File With Visual Studio .NET Without a Project

Microsoft Visual Studio .NET provides its own means of creating an XML file. Like any other XML file, Visual Studio doesn't control what you do with the file nor does it control where and when you can use the file. Whether you are working on a project or not, you can start creating an XML file any time.

If you are not working on any project, for example if you had just started Visual Studio and no project is opened, to create an XML file, on the main menu, you can click File -> New -> File... In the Templates section, you can click XML File:

New File

After clicking Open, a new file named XMLFile1 would be created. Internally, the file would have the .xml extension. If you add another XML file using the same technique, it would be called XMLFile2 or the incremental number.

Creating an XML File With Visual Studio .NET Within a Project

If you are already working on a project, to start an XML file, on the main menu, you can click Project -> Add New Item... Then, in the Templates section, click XML File (.xml). You would be required to give a name to the file:

Add New Item

After typing a name in the Name box, you can click Open.
 

Practical Learning Practical Learning: Adding a New XML File
  1. To add an XML file, on the main menu, click Project -> Add New Item...
  2. In the Templates list of the Add New Item dialog box, click XML File (.xml)
  3. In the Name box, set the string to Parts
  4. Click Open

The Document Object Model and the XmlDocument
 

Introduction

To implement XML, the .NET Framework provides the System::Xml namespace. When you create an XML file, there are standard rules you should (must) follow in order to have a valid document. The standards for an XML file are defined by the W3C Document Object Model (DOM). To support these standards, the System::Xml namespace provides the XmlDocument class. This class allows you to create an XML document, its contents, and many other related operations you may want to perform on the contents of the file.

Creating XML Code Using XmlDocument

To create XML code using XmlDocument, this class has a method called LoadXml(). Its syntax is simply:

public: virtual void LoadXml(String* xml);

This method takes a String pointer as argument. The XmlDocument::LoadXml() method doesn't create an XML file, it only allows you to provide or create XML code. The code can be created as argument. You can also first declare and initialize a pointer to String with the XML code, then pass it as argument to the XmlDocument::LoadXml() method.

The advantage of creating an XML file using Visual Studio .NET is that the file, its name, and an extension are created automatically. If you use the XmlDocument::LoadXml() method, only the XML code is created, not the file. To actually create the Windows file, you can call the XmlDocument::Save() method. This method is provided in four versions. One of them takes as argument a String object that would be the file name. The syntax of this method is:

public: virtual void Save(String* filename);

The argument must be a valid filename and must include the .xml extension. If you pass a string without backlashes, the file would be created in the same folder as the current project. If you want the file to be created somewhere else, pass the whole path. 

Practical Learning Practical Learning: Creating an XML Document
  1. Display the form. In the Toolbox, click the Button control and click the form
  2. Change its Text to Create Employees and its Name to btnCreateEmployees
  3. Double-click the newly added button to generate its Click event
  4. In the top section of the file, under the other using namespace lines, type:
     
    using namespace System::Xml;
  5. Implement the Click event of the btnCreateEmployees button as follows:
      
    System::Void btnCreateEmployees_Click(System::Object *  sender, System::EventArgs *  e)
{
	 XmlDocument *docXML = new XmlDocument;

	 docXML->LoadXml(S"");
}
  6. Save all

 
 
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