int32 DAQmxRegisterEveryNSamplesEvent (TaskHandle
taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, uInt32
options, DAQmxEveryNSamplesEventCallbackPtr callbackFunction, void
Registers a callback function to receive an event
when the specified number of samples is written from the device to
the buffer or from the buffer to the device. This function only
works with devices that support buffered tasks.
When you stop a task explicitly any pending events are discarded.
For example, if you call DAQmxStopTask then you do not receive any
||The task used in this function.
||The type of event you want to receive.
||This event type is only supported for input tasks. Events occur
when the specified number of samples are acquired into the buffer
from the device.
||This event type is only supported for output tasks. Events
occur when the specified number of samples are transferred from the
buffer to the device.
||The number of samples after which each event should occur.
||Use this parameter to set certain options. You can combine
flags with the bitwise-OR operator ('|') to set multiple options.
Pass a value of zero if no options need to be set.
||The callback function is called in a DAQmx thread. This is the
||The callback function is called in the thread which registered
the event. In order for the callback to occur, you must be
Windows This option
is supported only on Windows.
||Note If you are receiving synchronous events
faster than you are processing them, then the user interface of
your application might become unresponsive.
||The function that you want DAQmx to call when the event occurs.
The function you pass in this parameter must have the following
int32 CVICALLBACK Callback (TaskHandle
taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void
Upon entry to the callback, the taskHandle
parameter contains the handle to the task on which the event
occurred. The everyNSamplesEventType parameter
contains the value you passed in the
everyNSamplesEventType parameter of this function.
The nSamples parameter contains the value you
passed in the nSamples parameter of this function.
The callbackData parameter contains the value you
passed in the callbackData parameter of this
Passing NULL for this parameter
unregisters the event callback function.
||A value that you want DAQmx to pass to the callback function as
the function data parameter. Do not pass the address of a local
variable or any other variable that might not be valid when the
function is executed.
||The error code returned by the function in the
event of an error or warning. A value of 0 indicates success. A
positive value indicates a warning. A negative value indicates an