The ability to create visual, nonvisual, and marshaler extensions, and to call PowerBuilder objects from external C++ applications, opens up numerous opportunities to combine these capabilities to develop more complex applications.
Writing an extension that loads the PBVM
Most of the examples in this book and on the PowerBuilder Code Samples website at https://community.appeon.com/index.php/codeexchange/powerbuilder show you how to create an extension in C++ and use it in PowerBuilder, or how to write a C++ application that loads the PowerBuilder VM.
You could also write an extension that loads the PowerBuilder VM and uses a custom class user object, using the techniques described in this chapter. The following figure depicts the interaction between the PBVM and an external application that uses an extension.
Figure: Interaction between PBNI, the PBVM, and external applications
