TDMS file update in CVI

Hi Everyone,
I am new in CVI development.. My current work is on TDMS inside CVI 8.5 , I been through CVI help on TDMS and one white paper on NI website..
My current requirement is that user is running application and see the data on graph of user interface.. if user accepts the data and press control buttoon accept the data will get saved in TDMS file.. otherwise user will redo the data acqusition process to see another iteration result to accept or deny..
I am able to write data first time but as i accept another set of data it throws an error
-6604
TDMS_FileCouldNotBeOpened
The file could not be opened.
Inside TDMS_CreateFile function, i understand it may be as file is already created in first iteration..
Is there any way to update the same channel data by appending every iteration with time stamping ?
Thanks for your time and support
Regards
HS
Solved!
Go to Solution.

Hi,
my syntax for control button "Accept" press is as below
int CVICALLBACK DataSave (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
TDMSChannelHandle mainChannel;
    TDMSChannelGroupHandle mainChanGroup;
    TDMSFileHandle tdmsFileHandle;
switch (event)
  case EVENT_COMMIT:
    TDMS_CreateFile ("d:\\CVI\\signal.tdms", TDMS_Streaming, "signal", "", "", "",&tdmsFileHandle );
    TDMS_AddChannelGroup (tdmsFileHandle, "Main Group", "Dev1",&mainChanGroup);
    TDMS_AddChannel (mainChanGroup, TDMS_Double, "Main Channel", "ai0", "", &mainChannel);
    TDMS_AppendDataValues (mainChannel, sine, 100, 1);
    TDMS_CloseFile(tdmsFileHandle);
   break;
  case EVENT_RIGHT_CLICK:
   break;
return 0;
This works fine as i press Accept first time, this create signal.tdms and save data in mainChannel... But as i press it to save second time it throws error code "-6604" in TDMS_CreateFile syntax...
I want to append the data in mainchannel with time stamp over and over with acceped iteration results.. number of iteration is not predefined sothat ian initialize any array for mainchannel...
Anyway around to get it solved ?
Thanks HS

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Not sure if this is exactly what you want, but have you tried this?
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Hello,
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Attachments:
03_02_15.vi ‏688 KB

alfredog wrote:
Hello,
I am new to Labview and having a bit of trouble. I attach some code here. What I want to do is sample from a NI 9220 DAQ from 16 channels at 20kHz, while from a second NI 6009 sample from 4 channels at 1000 kHz. I want to append these together and then write to a TDMS file.
I have tried to write this code using NIDAQmx VIs but when I have it has resulted in the two DAQs not having the right timing with each other. The 6009 samples for a longer time.
I have now tried instead to use the DAQ assistant to read from the two VIs and it works in that TDMS files produced have the correct timing between the two DAQS. However, if I record for more than 2 minutes, in the end I want to end up recording for a much longer time, I have the "Not enough memory to complete operation" message appearing. This still happens even if I get rid of my charts to display the data, and also if I get rid of the NI 6009 completely and just keep the 9220 sampling at 20kHz. It happens even if I repalde my TDMS write and put a write measurement assistant in which I tell it to write a series of files that are each less than 2 minutes long.
I think it is something to do with the amount of data I am reading and is being held in memory. What can I do about this? Also, my charts display very slowly, basically evey second when the 20k are read in. However if I lower the amount of data read the charts don't display all the data points.
I attach my code, thanks for your help!
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As far as your charts updating very slowly - the way your code is designed, your charts only get data when both 20K samples & 1M samples are done collecting. Have you tried setting up DAQ assistant for continuous sampling instead of 20K samples or 1M samples?
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Hi all,
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Message Edited by TonP on 02-14-2007 07:45 AM
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Attached code is LabVIEW 2011.
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SRamirez wrote:
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