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