Re: looking for aai/waveform example

[Ralph Lange via Tech-talk <tech-talk@aps.anl.gov>]

For the record:

Using a recent version of EPICS Base, you can also avoid copying and swap pointers instead.

See How To Avoid Copying Arrays with waveformRecord in the EPICS How To pages.

In this specific case (shared memory involved) copying might be preferred, though.

Cheers,
~Ralph

On Thu, 30 Jul 2020 at 23:51, Hu, Yong via Tech-talk <tech-talk@aps.anl.gov> wrote:

Hi Dave,

 

For waveform record, I usually simply use “memcpy” in the device support routine, something like this:

 

    memcpy(precord->bptr, pointer-to-data-source, size-of-bytes-to-be-copied);

    precord->nelm = number-of-data-point;

precord->nord = number-of-data-point;

 

precord is a pointer to waveformRecord.

 

Good luck!

Yong