CITIZEN OPOS DRIVER 1.8 Application Development Guide
1.4. Application Developer
Application developer who wants to use this driver must be familiar with the following items.
・OPOS1.8 specifications
・General characteristics of CITIZEN POS printer
・Terms and structure of ActiveX control and OLE automation
・ActiveX control container development environment such as Microsoft Visual Basic and Microsoft Visual C++, etc.
1.5. OPOS Control
The OPOS control, conforming to ActiveX control specifications, provides the application with property, method, and/or event. It consists of control object (CO) for device class and service object (SO). CO supplies application interface (API) and SO executes the API,
The OPOS software us implemented by the use of the layer shown in the following figure.
System
Registration
Mapping
Parameter
Interface
ActiveX
Control
Interface
ActiveX
Automation
Application
Method
Property
Event
Control Object
Device class support Device independent
Method
Event
Method
Service Object
Device dependent
OPOS
Control
Operating System/Driver
Printer
Cash Drawer
Device Class
This is a category of the POS device sharing the set of property, method and event.
Control Object (CO)
Control Object provides the application with a set of property, method and event for each device class. CO is a standard Active (OLE 32 bit) control and is not visible at the time of execution. As a rule, this driver uses OPOS standard CO. (OPOS standard CO is installed automatically at the installation of this driver.)
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