Error 103: The type is unknown Definition (Type of variable) The Definition type is used to find out the characteristics of a type: simple type, advanced type, class, structure.... Report based on a variable (Data binding) A report based on a variable is used to directly print the information found in a WLanguage variable...... Data Binding: Creating controls from the "Project explorer" pane Data binding is a process that binds variables in memory to controls in a window or page...... OOP concepts A class contains the description of a data structure (members) and the processes (methods) that handle this structure.... Class inheritance The hierarchical organization in class and sub-class has allowed to create the notion of inheritance...... TableEnableFilter (Function) Implements a user filter on a column found in a Table or TreeView Table control. Indirection operators The { and } operators are used to access a control, a variable, a class member or a file item by dynamically building the name of control, variable, class member or item... Instantiation of an object To access a class, the object must be declared as being part of the class to handle, this is called object instantiation...... TmeLine control linked to a data file or variable You can create TimeLine controls directly linked to the data.... Generation of a class diagram using reverse engineering WINDEV, WINDEV Mobile and WEBDEV allow you to create the class diagram of an application using reverse engineering (files "...... HTMLClassAdd (Function) Adds a class into the HTML classes of a control. HTMLClassDelete (Function) Deletes a class from the HTML classes of a control. HTMLClassToggle (Function) Toggles a class in the HTML classes of a control: if the class does not exist, it is added; if the class already exists, it is deleted. Generating a class diagram The generation is used to create the WINDEV classes ("...... Error 1014: The access to the member of the class is restricted by a private inheritance Organizer control linked to a data file or to a variable You have the ability to create Organizer controls linked to data.... Error 1030: The access to the base class is restricted by a private inheritance Error 1029: The access to the base class is restricted by a protected inheritance Overview of OOP (Object Oriented Programming) The object-oriented programming (called "OOP") is a programming paradigm in which the programs are organized as sets of objects...... Interface An interface is used to divide the uses of features common to several elements from their implementations, which simplifies their re-usability. Error 1013: The access to the member of the class is restricted by a protected inheritance Error 4: A space is required after the ':' character "Is Class" operator The "is <Class>" operator is used to find out whether the object used in an object of the class (or an object of one of its derived classes)... Use case diagram A use case diagram is used to view the behavior of a system in such way that......