High Language Level API

High Language Level API

High Language Level API (HLLAPI) ist eine nicht standardisierte Programmierschnittstelle, die ursprünglich von IBM entwickelt wurde.

Mit HLLAPI kann eine Hostemulations-Software (siehe Host-Terminal-System) gesteuert werden.

Funktionsumfang

Die HLLAPI bietet ca. 100 verschiedene Funktionen an, beispielsweise können der Bildschirminhalt (Presentation Space) ausgelesen oder Tastendrücke an die Hostanwendung gesendet werden.

Nutzung der HLLAPI

Die HLLAPI wird durch eine DLL mit einer zentralen Funktion bereitgestellt. Die Funktion lautet hllapi, HLLAPI oder WinHLLAPI.

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

Über den Parameter func wird die HLLAPI-Funktion gewählt, die Parameter data und len dienem dem Datenaustausch. Über den Parameter retc wird in manchen Fällen ein Rückgabewert (Returncode) übermittelt.

Herstellerunterstützung

HLLAPI wird durch diverse Hersteller unterstützt, zum Beispiel

  • IBM
  • Attachmate
  • HOB
  • Intra-Sys

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