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The object-oriented programming (called "OOP") is a programming paradigm in which the programs are organized as sets of objects. Each object represents an instance of a given class, all the classes being members of a class hierarchy unified by inheritance releationships.
Therefore, objects are used by the OOP.
  • Each object is an instance of a given class.
  • The classes are linked between themselves by the inheritance relationships.
WLanguage and OOP
The WLanguage is object-oriented:
  • it supports the objects
  • the objects have an associated class
  • the classes can inherit attributes coming from "super classes"
Important: The purpose of this chapter is not to describe OOP concepts, but only to describe how to declare classes, methods and objects in WLanguage. This chapter presents the OOP syntax of WLanguage and the principle for creating an object-oriented program in WLanguage.
We assume that readers are familiar with the concept of classes, objects and inheritances, ...
If you are not familiar with OOP, we recommend that you read an OOP guide before you continue with the rest of this documentation.
Related Examples:
WD Simple OOP Training (WINDEV): WD Simple OOP
[ + ] The "WD Simple OOP" example is an educational example about the OOP with WINDEV. This example presents the operating mode of:
- classes,
- inheritances,
- virtual procedures,
- UML diagrams,
- ...
WD Controlling word processor Training (WINDEV): WD Controlling word processor
[ + ] The purpose of this example is to propose a universal interface, allowing to control these applications without having to worry about the application to control. This example is based on an object-oriented programming concept: the polymorphism. It consists in using different objects (OpenOffice object and Microsoft Word object) without really knowing which one is used.
WD Graphic Objects Training (WINDEV): WD Graphic Objects
[ + ] This example illustrates the power of WLanguage in object oriented programming.
This example is a graphic object editor.

It is possible to:
- move, resize objects
- make selections with a lasso or a mouse
- cut/copy/paste objects
- delete/duplicate objects
- save the created documents and print them.

The main technical features presented and documented are:
- management of an object clipboard
- UNDO/REDO management
- serialization and deserialization of objects
- algorithms for managing graphic objects (proportional resizing, management of move rules, etc...)
WD Controlling Outlook Training (WINDEV): WD Controlling Outlook
[ + ] This program, powered by WINDEV, is used to read and write in the Outlook folders:
- Email
- Calendar
- Contacts
- Tasks
- Notes

An OLE dialog is used to read and write data in the Outlook files.
Note: We will be using the Outlook software supplied with the later versions of MS-Office. The software used is not "Outlook express".

"WD Controlling Outlook" also presents an example for using the WINDEV databinding between the variables found in the code and in the controls.

This example also presents the OOP (Object-Oriented Programming) and the UML diagrams.
WD Flowchart Training (WINDEV): WD Flowchart
[ + ] This example is used to create organization charts.
An organization chart is used to indicate the repartition of the managers within a company and the relationships that exist between these managers.
Minimum version required
  • Version 9
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