The Host Access Class Library (HACL) is a set of objects that allows
application programmers to access host applications easily and quickly. HCLZ and I Emulator for Windows provides support for a wide variety of programming
languages and environments by supporting several different HACL layers:
C++ objects, Java™ objects, Microsoft® COM-based automation technology (OLE). Each layer provides
the same basic functionality, but each layer has some differences
due to the different syntax and capabilities of each environment.
The most functional and flexible layer is the C++ layer, which provides
the basis for all others.
This layering concept allows the basic HACL functions to be used
with a wide variety of programming environments including Java™, Microsoft®Visual Basic®, Visual
Basic® for Applications, Lotus®Notes™, Lotus® WordPro
and Visual C++®. The following figure
shows the HACL layers.
Figure 1. HACL
Layers
