User's Manual

6-14
Concepts
When you use drop-in components in your program you will follow the standard
object-oriented programming paradigm that uses properties, methods, and events
to implement the functionality of the drop-in component.
• Properties are the various configuration variables used by the drop-in
• component. An example of a property is the
ComDeviceName setting.
• Methods are function calls used to issue commands and access features of
the drop-in component. An example of a method is sending an Input
command to the terminal.
• Events are function definitions placed in your application’s source code. The
function definitions in your source code are called Event Handlers. The
skeleton structure of the event handler’s source code is automatically
generated. The code in the Event Handler is called ("fired") by the drop-in
component when a specific event occurs. An example of an event is when a
terminal returns data and the OnTermData event is fired.
The details of how to access Properties/Methods/Events varies between
development platforms. Details of how it works in some of the most popular
platforms is illustrated in the samples included with the RF Utilities CD or
available for download from our website at:
http://www.barcodehq.com/wdterminal.exe
Properties
Properties are the various configuration variables used by the WDterm control.
They are directly assignable in your application (e.g. "WDterm.ActiveTerminal
= 5") and can be set in your development environment’s object browser.
Important: Except for ActiveTerminal and Quiet, all properties require the serial
port to be "closed" before they can be changed. Use the CloseDevice method
before setting properties and then call OpenDevice to re-open the serial port.
Note that your development environment may show more properties for the
WDterm control than are listed here. This is normal. You may ignore properties
you see that are not listed here.
ActiveTerminal
Valid values: 0 through 15
Definition: This is the terminal ID (0-15) to which method call
instructions are directed.