Starting a read from arbitrary point in buffer

[JasonAtSeagate]

Using the DAQmx API, is there a way to read out a section of the buffer starting at some aribitrary (non-zero) index?  I would like to combine such a technique with the DAQmxRegisterEveryNSamplesEvent callback, so that I can post a visual monitor to the GUI of what the system is doing during a long acquistion.

[CWolf · Accepted solution]

There are two properties in DAQmx that may be useful to you: the Offset, and the RelativeTo properties.  The Offset parameter changes where in the buffer a read begins, and the RelativeTo parameter determines what that offset is relative to (such as the first sample or the most recent sample). 

int32 __CFUNC DAQmxSetReadRelativeTo(TaskHandle taskHandle, int32 data);

int32 __CFUNC DAQmxSetReadOffset(TaskHandle taskHandle, int32 data);

-Christina