Agilent Technologies FS2010 Guía de usuario descargar pdf (Pagina 70)

70 Agilent VISA User’s Guide

3 Programming with VISA

This sample program is installed on your system in the

ProgrammingSamples subdirectory. See the IO Libraries

Suite Online Help for locations of sample programs.

/* evnthdlr.c

This example program illustrates installing an

event handler to be called when a trigger

interrupt occurs. Note that you may need to

change the address. */

#include <visa.h>

#include <stdio.h>

/* trigger event handler */

ViStatus _VI_FUNCH myHdlr(ViSession vi,

ViEventType eventType, ViEvent ctx, ViAddr

userHdlr){

ViInt16 trigId;

/* make sure it is a trigger event */

if(eventType!=VI_EVENT_TRIG){

/* Stray event, so ignore */

return VI_SUCCESS;

}

/* print the event information */

printf("Trigger Event Occurred!\n");

printf("...Original Device Session = %ld\n",

vi);

/* get the trigger that fired */

viGetAttribute(ctx, VI_ATTR_RECV_TRIG_ID,

&trigId);

printf("Trigger that fired: ");

switch(trigId){

case VI_TRIG_TTL0:

printf("TTL0");

break;

default:

printf("<other 0x%x>", trigId);

break;

}

printf("\n");

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Agilent Technologies FS2010 Guía de usuario Pagina 70