Справочник Пользователя для Worth Data 802 RF
6-1
Chapter 6
Programming for the 802 RF Terminal
The programming support offered for the 802 RF Terminal is an ActiveX drop-
in component. Every necessary function is defined - you just complete the code
for each function.
in component. Every necessary function is defined - you just complete the code
for each function.
The ActiveX component functions as a Server for managing data traffic to and
from one or more terminals (your “terminal network”) and as an interface for
your host application. There is no other software required, besides this control
and your host application, to run a terminal network.
from one or more terminals (your “terminal network”) and as an interface for
your host application. There is no other software required, besides this control
and your host application, to run a terminal network.
Introduction
It is important to note that creating working programs for the 802 Terminal requires
significant programming skills. In order to create a working application you will not
only need to be familiar with a programming language such as Visual Basic or
Delphi or C++; you will need to be experienced and comfortable building real
applications with one of these (or similar) programming environments.
significant programming skills. In order to create a working application you will not
only need to be familiar with a programming language such as Visual Basic or
Delphi or C++; you will need to be experienced and comfortable building real
applications with one of these (or similar) programming environments.
You should be familiar with the concepts of objects, methods, event handlers,
properties, scope, arrays, pointers, variable and value parameter passing, etc.
properties, scope, arrays, pointers, variable and value parameter passing, etc.
Database connectivity, data structures, and state management techniques are key
to creating a program that can work with multiple terminals.
to creating a program that can work with multiple terminals.
If you do not understand the references mentioned here and the implications of the
pseudo code illustrations, you may not have the skills necessary to create a working
application using the 802 Terminal WD802Term ActiveX programming tool.
pseudo code illustrations, you may not have the skills necessary to create a working
application using the 802 Terminal WD802Term ActiveX programming tool.
What follows are just examples to get you started and show some basic
technique. There are lots of different ways to do this and it is possible to create
sophisticated transactions that intelligently instruct the terminal operator and
collect complex data.
technique. There are lots of different ways to do this and it is possible to create
sophisticated transactions that intelligently instruct the terminal operator and
collect complex data.
Objects, Properties, Methods, and Events
The programming model for the 802 Terminal is based on the WD802Term
ActiveX component. This component is an "object" that is embedded in
your application that you build using a compatible programming
environment such as Visual Basic or Delphi.
ActiveX component. This component is an "object" that is embedded in
your application that you build using a compatible programming
environment such as Visual Basic or Delphi.
The WD802Term "object" has a number of methods, event handlers, and
properties that it publishes (makes available) to your program.
properties that it publishes (makes available) to your program.
Properties are generally initialization and configuration settings that you
set once when your application starts. Examples are ServerActive and
LogFileName.
set once when your application starts. Examples are ServerActive and
LogFileName.