DATAFILELOADSEL load group by name

[aartjan]

Hi All,
I want to load a specific group of a tdms file into Diadem. Unfortunately there is a little race condition in my labview code that causes this goup to sometimes have index 3, other times index 4. No sweat, I thought, I'll just load the group by name!
Unfortunately the DATAFILELOADSEL  function doesn't seem to support this syntax, so I will have to first search for the index. Can anybody tell me how to first search the index of a specific group name?
BTW. I want to find the index without first having to load the whole file (they are large!).
Thanks!
Aart-Jan

[DavidS!]

Hi Aart-Jan,

I had a similar problem some time ago and work around it by "registering" the data in the portal

Call DATAFILELOAD(filename,"","Register")
This goes a lot faster then loading the file and you can access group indices etc. Then you clear the data portal

Call DATADELALL

and load your specific data with DATAFILELOADSEL 

Hope this helps.

DavidS!

also see:

http://forums.ni.com/ni/board/message?board.id=60&message.id=5825#M5825

[aartjan]

mm, got it working after all. Sorry..
CALL DATAFILELOADSEL(file,"TDMS","LF analysis/*","")

[aartjan]

Thanks David, indeed, registring was my workaround to be searching for channel names. Do you know how to write commands for searching groups by name?
My problem is solved, but I am interested in doing such things (including looping and such) in Diadem.
Thanks,
Aart-Jan

[DavidS!]

Dear Aart-Jan,

I'm not sure if I got your problem correctly, but maybe this is what you're looking for:

For i = 1 to GroupCount   ' Loop over all groups
  If GroupName(i) = "TurbulenceLengthdScales" Then
    exist = TRUE
    Exit For
    else
    exist = FALSE
  End If
Next
If exist Then
CAll Msgbox("Group has index no: " & i)
else
CAll Msgbox("Group does not exist")
End If

Regards,

DavidS!