I found that if you 'open' an empty (0 byte) file using TDMS open, you will not get any error messages when you open it, nor when you call functions such as "Get properties" or "List content", also no error when you close the TDMS file. If the file is non-empty, but not a valid TDMS file, TDMS open returns an error. I would have expected that I would get an error or a warning at least when trying to read a non-existant property or group, if not by the open function itself?! The 2013 snippet below creates a 1-byte or empty file in the local user temporary folder, closes the file, then attempts to open and read it as a TDMS file. The temporary file is deleted afterwards. If the file is empty, NO errors or warnings occur at any point. If the file is not empty, it fails on the TDMS open. (Note the sequence structure is because the path out of the tdms close is invalid if the tdms open failed. This could conceivably cause an issue if your program does not do additional fault checking to catch existing but empty files. (Which of course shouldn't ever happen, but in some situations it could happen.)

LabVIEW

Hi QFang,

The CAR is #513201. Thanks!

-Tianbin

Message 11 of 12

(1,058 Views)

Author

Thank you Tianbin_Xu!

Now everyone go look at my idea-exchange for better handling/tracking of CAR#'s 🙂

QFang
-------------
CLD LabVIEW 7.1 to 2016

Message 12 of 12

(1,035 Views)