HLLAPI

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High Level Language Application Programming Interface (HLLAPI) is a non-standard programming interface originally developed by IBM .

A host emulation software (see host terminal system ) can be controlled with HLLAPI .

Range of functions

The HLLAPI offers around 100 different functions, for example the screen content ( presentation space ) can be read out or key presses can be sent to the host application.

Use of the HLLAPI

The HLLAPI is provided by a DLL with a central function. The function is hllapi, HLLAPIor WinHLLAPI.

function(func:lpint; data:PCHAR; len:lpint; retc:lpint):integer; stdcall;

The funcHLLAPI function is selected via the parameter , and the parameters dataand are lenused for data exchange. In retcsome cases a return value (return code ) is transmitted via the parameter .

Manufacturer support

HLLAPI is supported by various manufacturers, for example

  • IBM
  • Attachmate
  • HOB
  • Intra-Sys