Dll Direct Entry Ni-488 Functions And Ni-488.2 Routines - National Instruments GPIB-232CT-A Getting Started

Ni-488.2 software for ms-dos/windows

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Appendix D

DLL Direct Entry NI-488 Functions

and NI-488.2 Routines

This appendix explains and gives examples of how to use the DLL Direct

Entry NI-488 functions and NI-488.2 routines to access the GPIB.DLL

file. Following the examples are tables that list all NI-488.2 routines and

NI-488 functions, including their calling syntax and ordinal entry values.

The DLL Direct Entry NI-488 functions and NI-488.2 routines can be used

to access the GPIB.DLL file from any language or programming

environment that runs under Windows and supports access to standard

Windows DLL functions. As with all functions exported by a DLL, these

functions conform to the PASCAL calling conventions. A few examples of

using these entry points follow. Tables D-1 and D-2 contain a complete list

of all of the entry points.

For specific information on the variables ibsta, iberr, and ibcntl,

refer to Chapter 3, Understanding the NI-488.2 Software, in the NI-488.2

Software Reference Manual for MS-DOS. For specific information on a

routine or function, refer to the NI-488.2 Software Reference Manual for

MS-DOS. For information about accessing dynamic link library DLL

functions from a given language or environment or using ordinal entry

values which some environments do not support, see the documentation

provided with that package.

Example 1, accessing the GPIB.DLL file from Turbo Pascal for Windows:

(* First, import the DLL functions you plan to use. *)

function DLLibfind(udname: PChar;

external 'GPIB' index 22;

function DLLibsic(ud: integer;

external 'GPIB' index 42;

var ibsta: integer;

var iberr: integer;

var ibcntl: longint) : integer; far;

var: ibsta: integer;

var: iberr: integer;

var: ibcntl: longint) : integer; far;

D-1 GPIB-232CT-A for MS-DOS/Windows

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