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   ► KBProgrammingDelphi PrismOOP   Print This     
  From the March 2010 Issue of Prestwood eMag
 
Prism OOP:
Delphi Prism Member Method (method, procedure, function)
 
Posted 12 years ago on 12/20/2008 and updated 1/20/2009
Prism Code Snippet:
 A flashcard from our Prism Flashcards Library
 A code snippet from our Prism Code Snippets Page

KB101747

General Info: Member Method

Also known as a Class Method.

A code routine that belongs to the class or an object instance (an instance of the class). Methods that belong to the class are called class methods or static methods. Methods that belong to an object instance are called instance methods, or simply methods.

When a method returns a value, it is a function method. When no value is returned (or void), it is a procedure method.

Methods frequently use method parameters to transfer data. When one object instance calls another object instance using a method with parameters, you call that messaging.

Delphi Prism Member Method

Prism uses the keyword method for member methods and is the preferred syntax over the legacy procedure and function keywords. Although method is preferred, you can use procedure or function if you want the compiler to make sure all functions return a value and all procedures do not.

Syntax Example:

In the interface section:

Cyborg = class(System.Object)
  public method IntroduceYourself();
end;

In the Implementation section:

method Cyborg.IntroduceYourself();
begin
  MessageBox.Show("Hi, I do not have a name yet.");
end;
 

On some event like a button click:

var T1: Cyborg;
begin
  T1 := New Cyborg;
  T1.IntroduceYourself;
end;

More Info

Definition:  Member Method

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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