I.T. Discussion Community!
-Collapse +Expand
To/From Code
-Collapse +Expand Cross Ref Guide
-Collapse +Expand Members-Only
Sign in to see member-only pages.
   ► KBTo/From GuidesDelphi  Print This     

Member Method (Delphi and Access VBA Cross Reference Guide)

By Mike Prestwood

Delphi versus Access VBA: A side by side comparison between Delphi and Access VBA.

 
OOP Basics
 

Some languages support object-based concepts such as Paradox, Access, and VB Classic. Other languages have OO extensions and fully support object orientation in a hybrid fashion (such as C++ and Dephi for Win32). Finally, some lanages such as C#, VB.Net, Prism, and Java are entirely written in OO. Meaning, every line of code written must occur within a class).

Member Method

[Other Languages] 

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:   procedure, function

Delphi uses the keywords procedure and function. A procedure does not return a value and a function does.

Syntax Example:
//Interface section:
TCyborg = class(TObject)
public
  procedure IntroduceYourself;
end;
 
//Implementation section;
procedure TCyborg.IntroduceYourself;
begin
  ShowMessage('Hi, I do not have a name yet.');
end;
 
//Some event like a button click:
var
  T1: TCyborg;
begin
  T1 := T1.Create;
  T1.IntroduceYourself;
end;
Access VBA:   Sub, Function

Access VBA uses the keywords sub and function. A sub does not return a value and a function does. Many programmers like to use the optional call keyword when calling a sub to indicate the call is to a procedure.

More Info / Comment













Follow PrestwoodBoards on: 


©1995-2020 PrestwoodBoards  [Security & Privacy]
Professional IT Services: Coding | Websites | Computer Tech