Reading of file problem class

I wrote an application that back up data to a file as a class of labview. The class consists of the table of waveforms and other classes. When I want to read data from the file, I get error 1527 "tried to read flattened data of a class of LabVIEW that is not currently loaded into LabVIEW".

I tried to delete class library, because I found on the forums that it could be the cause of the problem, but it's no help. Then I put the class library, and now I get the error "end of file encountered.

I don't know what I'm doing wrong, because I used the same approach several times and it worked fine.

Is there another way to read data in the file? For example, if I want to know how the waveforms table is saved in the binary file I could analyze the data from file.

I have Labview 2011.

I'm guessing that this happens because only the class lost its changing history, so he doesn't know how to load old data. What could cause this is made to rename the class and moving to or from a library (as you found it). Replacing it does not back the history of the mutation and the only option is to go back to an older version of the class (if you have the source code control).

Here are some relevant links, including descriptions of the flat how data are backed up, in no particular order:

  1. http://lavag.org/topic/14548-class-mutation-history
  2. http://zone.NI.com/DevZone/CDA/tut/p/ID/6316
  3. http://lavag.org/topic/13441-unflatten-from-string-on-class-Error-1527
  4. http://labviewwiki.org/LVClass_Data_Storage_Format
  5. http://digital.NI.com/public.nsf/allkb/103A235CD004CF5B862577E400752398
  6. http://zone.NI.com/reference/en-XX/help/371361H-01/lvconcepts/flattened_data/
  7. http://lavag.org/topic/9705-behaviour-when-loading-class-data-from-a-flat-binary-file

Tags: NI Software

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