LabVIEW
TDMS Delete Properties
@Nicolas_Bats wrote:
Hi all,
Does someone has any idea on how to delete a property in a TDMS file (either on a channel / group / file) ? There is no existing primitive VI to do so in LabVIEW. I have randomly tried a few things in the VI enclosed but I have the feeling that the "TDMS Set Properties" works more like a "TDMS Add Properties".
Thank you in advance for your help.
"TDMS Set Properties" works like "TDMS Set Properties." If the property exists then it changes the property value. If the property does not exist then it adds the property and sets the value. It does not have functionality to delete an existing property.
As you are the second person asking about this recently I'm curious as to the use case. I don't believe that I've ever had a time where I needed to delete an existing property.
@Nicolas_Bats wrote:
@johntrich1971 a écrit :
As you are the second person asking about this recently I'm curious as to the use case. I don't believe that I've ever had a time where I needed to delete an existing property.
In my case I have a post traitement tool that can analyse TDMS files and make some computations on waveform. Some waveforms are flagged with properties that I want to remove if the tool decide that the flag is innapropriate.
You call these properties flags. Why not have the properties always there and make them TRUE or FALSE? This would seem to be a more normal (and easier to use) flag method than checking to see whether or not the value exists.
@Nicolas_Bats wrote:
@johntrich1971 a écrit :
You call these properties flags. Why not have the properties always there and make them TRUE or FALSE? This would seem to be a more normal (and easier to use) flag method than checking to see whether or not the value exists.
I could proceed like that but it just do not correspond to what I am trying to achieve and how things are working in my system 🙂
Perhaps if you shared your code it would be more practical to help you to achieve what you are trying to achieve.
Hi Nicolas,
as has been said several times before you cannot delete properties, when you don't want to create a copy of your file.
What about setting the properties to a certain value to mark it as "invalid" for your further data processing?
