6 9 5 RDML and RDMLX Programs

6.9.5 RDML and RDMLX Programs

RDML Commands that cannot be used in Visual LANSA

When you are writing event-driven programs, the majority of the commands you will use are RDML commands. However, there are a number of commands, called RDMLX commands, which are required for the event-driven programming method.

The RDMLX commands are used to invoke methods, and to handle events and properties. These are all high level 4GL commands which shield you from many of the complexities typical of object-oriented programming. Some of these RDMLX commands are:

RDMLX Only	Description
BEGIN_COM and END_COM	Starts and ends a component definition, usually a form. Inserted automatically.
DEFINE_COM	Defines a component inside another one. Inserted automatically.
EVTROUTINE	Defines a routine for an event. Inserted automatically.
INVOKE	Invokes a method.
SET	Sets a property.
DEFINE_EVT	Creates a user-defined event.
SIGNAL	Triggers a user-defined event.
DEFINE_MAP	Creates input and output parameters.
DEFINE_PTY	Creates a user-defined property.
MTHROUTINE	Creates a user-defined method.
PTYROUTINE	Creates a user-defined property.

 

The BEGIN_COM, END_COM, DEFINE_COM and EVTROUTINE are automatically inserted by the Visual LANSA editor when you drag and drop components or click on events, so you will never have to enter them yourself.

SET is one of the few RDMLX commands you will be using frequently:

 

SET COM(#MyEditBox) TEXT('HELLO!')

 

This command sets the Text property of MyEditBox to 'HELLO!'

Also See

6. Creating Applications Using Components

Ý 6.9 Event-Driven Programs

RDMLX Commands in the Technical Reference Guide, for a list of all RDMLX commands.