National Instruments NI-488.2 ユーザーズマニュアル

Before you compile your Win32 C application, make sure that the 
following lines are included at the beginning of your program:

#include <windows.h>

#include "ni488.h"

To compile and link a Win32 console application named 

cprog

 

in a DOS shell, type the following on the command line:

bcc32 -w32 cprog.c borlandc_gpib-32.obj

With Visual Basic, you can access the traditional NI-488.2 calls as 
subroutines, using the BASIC keyword 

CALL

 followed by the traditional 

NI-488.2 call name, or you can access them using the 

il

 set of functions. 

With some of the NI-488.2 calls (for example 

ibrd

 and 

Receive

), the 

length of the string buffer is automatically calculated within the actual 
function or subroutine, which eliminates the need to pass in the length as 
an extra parameter. For more information about function syntax for Visual 
Basic, refer to the NI-488.2 online help. For instructions on accessing the 
online help, refer to the 

 section in 

.

Before you run your Visual Basic application, include the 

niglobal.bas

 

and 

vbib-32.bas

 files in your application project file.

The following sections describe how to use direct entry with C.

gpib-32.dll

 exports pointers to the global variables and all of the 

NI-488.2 calls. Pointers to the global variables (

ibsta

, 

iberr

, 

ibcnt

, 

and

ibcntl

) are accessible through these exported variables:

int *user_ibsta;

int *user_iberr;

int *user_ibcnt;

long *user_ibcntl;

Except for the functions that have string parameters such as 

ibfind

, 

ibrdf

, and 

ibwrtf

, all the NI-488.2 call names are exported from 

gpib-32.dll

. Thus, to use direct entry to access a particular function and