topic Re: Datalog Write can only append and not replace record in LabVIEW

Datalog Write can only append and not replace record

zigbee1 — Tue, 13 Oct 2015 05:11:08 GMT

I noticed that Datalog Write function only appends data to an existing datalog and did not replace the record set by Set Datalog position. That is very odd, is this by design or I missed something ?

Re: Datalog Write can only append and not replace record

Shalini.M — Tue, 27 May 2025 23:56:59 GMT

Hi Zigbee1,

From the context help on LabVIEW, the Write Datalog Function "sets the current datalog position to the end of the file before writing".
It also explains in the link below that you cannot overwrite a record after LabVIEW writes it to a datalog file.

https://www.ni.com/docs/en-US/bundle/labview/page/datalog-files.html

Re: Datalog Write can only append and not replace record

zigbee1 — Tue, 13 Oct 2015 21:10:55 GMT

Thanks for pointing out...

Yep, still keep my heart up for NI to offer modifying existing datalog files in the future..