Encapsulating a Common Control

At this point, we have introduced the Win32 API, shown how to map a Win32 C data type to a PowerBuilder data type, created an external function call, and sent a message to a standard PB control. The next step is to completely encapsulate a common control so that all of the supported messages are exposed as a set of object functions. The goal is to create a reusable control that can be dropped into any application and used just like any other standard PowerBuilder control.