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Programming with VISA 3

Agilent VISA User’s Guide 63

• When ready to query, use the viWaitOnEvent function to check for

queued events.

If the specified event has occurred, the event information is retrieved

and the program returns immediately. If the specified event has not

occurred, the program suspends execution until a specified event occurs

or until the specified timeout period is reached.

Example: Using the Queuing Method This example program

shows one way you can use the queuing method.

main();

ViSession vi;

ViEventType eventType;

ViEvent event;

viEnableEvent(vi, VI_EVENT_SERVICE_REQ,

VI_QUEUE, VI_NULL);

viWaitOnEvent(vi, VI_EVENT_SERVICE_REQ,

VI_TMO_INFINITE, &eventType, &event);

viClose(event);

viDisableEvent(vi, VI_EVENT_SERVICE_REQ,

VI_QUEUE);

}

Enabling Events

Before an event can be delivered, it must be enabled using the

viEnableEvent function:

viEnableEvent(vi, eventType, mechanism,

context);

These parameters are defined as follows:

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Agilent Technologies E2094S Guida Utente Pagina 63