This is a beta release of the PdfLibTest.dll (barcode) and MagLibTest.dll modified to support an Interface to the library.
The project below contains a button event that demonstrates the interface for the both libraries:
The link below is a VS2015 project, with a compiled executable in the debug folder.
There is also a word document in the archive that shows the variables that make up the Interface.
DLLParsingTest-Interface-3.4.0.1.zip