Measurement Computing Personal488 rev.3.0 - Manual (Page 101)

Personal488 for Windows 95/98/Me/NT/2000 04-10-01 API Reference 6-33
OnDigEventVDM
AT488pnp and PCI488 Only ! Windows9x Only !
Syntax INT WINAPI OnDigEventVDM(DevHandleT devHandle, DigEventFuncT
func, OpaqueP lParam);
devHandle refers to an interface handle.
func is a user-defined function to be called when the digital match event is triggered.
lParam value will be passed in the notification message.
Returns -1 if error
Bus States None
Example OnDigEventVDM(devHandle,
MyFunc, 0x10L);
Sets the event notification to be via a function call to
the specified callback function. The value
0x10 will be passed to the function.
See Also DigArm, OnDigEventVDM, OnEventVDM
The OnDigEventVDM command sets the address of a “C”-style ( __stdcall ) function to be called when a
digital match event occurs. This function uses a similar mechanism as the OnEventVDM command. The
prototype of the callback function for OnDigEventVDM is:
void DigEventFunc( DevHandleT devHandle, LPARAM lParam )
The lParam value that is passed to OnDigEventVDM is passed on to the callback function when the event
occurs. For details, see the description of OnEventVDM .
Note: This function sets the event generation mechanism to be a callback function, replacing any
previously defined event notification mechanism. Only one event notification mechanism
can be used at one time.