Reading lenght of TDMS file

[tj1995]

Hi, I need to read in my labview vi the TDMS file lenght attribute. For example i've attached a TDMS file and i don't know how can i return 6 from the file attributes. How can i do? Thanks

[PalanivelThiruvenkadam]

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@tj1995 wrote:

Hi, I need to read in my labview vi the TDMS file lenght attribute. For example i've attached a TDMS file and i don't know how can i return 6 from the file attributes. How can i do? Thanks

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Check TDMS Viewer to View the Information and you can get to know what's the Group/Channel and count you need to provide to Read TDMS File.

TDMS Read Function - NI

TDMS File Viewer VI - NI

[tj1995]

I save my DAQ acquisitions in this file TDMS that contains arrays with different rows. In my vi i need to know how many rows and columns the file has. This is my problem and i don't know how do that.

[Hooovahh]

The TDMS Viewer that was mentioned already is an open set of VIs that shows how to do this.  To read the number of groups, use the TDMS List Contents with nothing wired to the group name.  This will return the array of Group Names.  If you want to know the number of channels within a group, wire a group name to the TDMS List Contents and it will return an array of channels under that group.  If you want to know the number of samples under a channel, within a group, use the TDMS Get Properties, where you wire the group and channel, with the property to read being the string "NI_ChannelLength" and the data type being an I64 numeric.

[tj1995]

I've tried in this way, but it doesn't work. Have I made some mistakes?

 

[PalanivelThiruvenkadam]

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@tj1995 wrote:

I've tried in this way, but it doesn't work. Have I made some mistakes?

 

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Have you tried TDMS Viewer?

Try this you will get the measurements based on Channel Names.

[tj1995]

Yes, I've tried, but I can't get out from the file the information about the lenght (6) of the file...

[PalanivelThiruvenkadam · Accepted solution]

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@tj1995 wrote:

Yes, I've tried, but I can't get out from the file the information about the lenght (6) of the file...

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Sorry it was my fault i shared the read data instead of properties..

[tj1995]

thank you!!