Using the HLLAPI Interface

The HLLAPI interface is a collection of functions which can be used within a Visual Basic, C, or C++ application to indirectly access the tn3270 input and output. The Windows HLLAPI Specification provides a standard programming interface to all 3270 emulation products. The Century Software's HLLAPI 1.0 is based on the Windows HLLAPI Specification version 1.1.

Tutorial

The following topics give a brief introduction to using CEN HLLAPI. This tutorial assumes you already know how to use HLLAPI functions.

Ehll0000.gif Writing a HLLAPI program.

Ehll0000.gif Enabling HLLAPI in tn3270.

Ehll0000.gif Connecting your HLLAPI program to a HLLAPI-enabled tn3270 session.

Reference

The following topics describe a few differences between CEN HLLAPI and the WinHLLAPI specification.

Ehll0000.gif Multiple Sessions

Ehll0000.gif Set Session Parameters

Ehll0000.gif HLLAPI Functions

Ehll0000.gif File Transfer

A HLLAPI kit is available on our FTP site (ftp://ftp.censoft.com), and the README with the kit describes any discrepancies between WinHLLAPI and Century Software's HLLAPI. The name of the kit is HLLAPI.ZIP.