Unknown data type -1

[ghost]

Hello,

When I try to open tdms files, the reader throws an exception "Unknown data type -1".
That occurs in the Open() operation:

var tdms = new NationalInstruments.Tdms.File(filePath);
tdms.Open();

This exceptions only occurs sometimes, but I would like to know why. Maybe a problem in the files or maybe a problem with the reader with newest versions of the files.

Thanks in advance!

[mikeobrien]

I'm not really sure what could be causing the problem, haven't seen that before. Might want to grab the code and debug it while opening your file, will probably help troubleshoot.

[tommyja]

@rafa0809 if you post a file with the issue I will take a look.

[betsalel-williamson]

Ran into this issue as well. Have two example files for you @tommyja

https://github.com/NIVeriStandAdd-Ons/Time-Align-NIVS-TDMS-Files-Tool/blob/master/Example%20Files/100k%208133.tdms

https://github.com/NIVeriStandAdd-Ons/Time-Align-NIVS-TDMS-Files-Tool/blob/master/Example%20Files/100k%208108.tdms

[betsalel-williamson]

Line 66 of the Reader.cs file gave -1 which is the source of this issue.

[mikeobrien]

Thx! I'll try to take a look as soon as I can. Sorry for the delayed response.

[tom-mcs]

I am also having this issue. Is there any insight into what is happening?

Stepping through:
File.cs Open() is calling LoadMetadata(reader).ToList();
DataType.cs GetClrType(int dataType) is throwing the exception.

From the stack:
Reader.cs ReadMetadata(Segment segment) is calling GetClrType(metadata.RawData.DataType)

This means that metadata.RawData.DataType is being set to -1 in the line before (i.e. Reader.cs line 66)
metadata.RawData.DataType = _reader.ReadInt32();
It should be set (in my case) to 10: DoubleFloat

[tom-mcs]

Interesting clue:
The call to _reader.ReadInt32() immediately prior to the one returning -1. Assigns a value of 4713 to rawDataIndexLength.

4713, according to the tdms whitepaper refers to the version number of the tdms file format, which wouldn't seem to have much to do with the rawDataIndexLength. I have observed this result with two separate .tdms files.

Perhaps something is being read out of order for some cases of tdms files.

[tom-mcs]

Oh solved.

4713 refers to TDMS2.0. As discussed in another issue, this project only supports TDMS1.0. Is that correct? I may be able to use 1.0 in my project.

[mettekou]

@ghost @tom-mcs @betsalel-williamson The unrecognized data type -1 (= 0xFFFFFFFF) is DAQmx raw data, which TDMSReader does not currently support. I am closing this issue as a duplicate of #18, which has more information on the subject.