| 摘要 |
A GPIB system which includes asynchronous event notification. The GPIB application first provides a notify request to GPIB driver level software, preferably an ibnotify call or a GPIB Notify OLE control. The notify request includes a unit descriptor which uniquely identifies the GPIB device, event information regarding a plurality of GPIB events to monitor, a reference to a callback function in the GPIB application, and user defined reference data for the callback function. In response to the notify request, the GPIB driver level software begins monitoring events specified by the event information. When an event occurs which is being monitored, the GPIB driver level software recognizes the event and invokes the callback function. The invocation of the callback function is performed asynchronously to the GPIB application. The callback function may include one or more calls to one or more functions in the GPIB driver software. The callback function also uses the user defined reference data to aid in handling the event.
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