Agilent Technologies FS2010 Guia do Utilizador descarregar pdf (Página 74)

74 Agilent VISA User’s Guide

3 Programming with VISA

/* Wait a while for the SRQ to be generated and

for the handler to be called. Print something

while we wait */

printf("Waiting for an SRQ to be generated.");

for (count = 0 ; (count < 10) &&

(srqOccurred == 0);count++) {

long count2 = 0;

printf( "." );

while ( (count2++ < 100) && (srqOccurred ==0)

){YIELD;

}

printf( "\n" );

/* disable and uninstall the handler */

viDisableEvent(vi, VI_EVENT_SERVICE_REQ,

VI_HNDLR);

viUninstallHandler(vi, VI_EVENT_SERVICE_REQ,

mySrqHdlr, (ViAddr)10);

/* Clean up - do not leave device in error

state */

viPrintf( vi, "*CLS\n" );

/* close the sessions */

viClose(vi);

viClose(defaultRM);

printf( "End of program\n" );}

Using the Queuing Method

The queuing method is generally used when an immediate

response from your application is not needed. To use the

queuing method for receiving notification that an event has

occurred, you must do the following:

• Enable one or several events with the viEnableEvent

function.

• When ready to query, use the viWaitOnEvent function to

check for queued events.

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Agilent Technologies FS2010 Guia do Utilizador Página 74