Binary read with one of the many possible definitions - or - how ot loop over different groups?
Hi all
I have a group of different data types that I save as a binary file and read it again at a later date with an another VI. I saved the definiton of cluster with a typedef, so I am sure that I use the same type of reading and writing.
Now, I needed to change the cluster in the writing program should include another value. However, I still want to be able to use the VI of reading to read the old and new data files. I also have the opportunity to change the definition of binary file in the future (in VI writing) and be able to quickly adapt the VI to read the new definition while maintaining compatibility with the old.
My plan was to have a typedef of the pole for each revision, say v1.ctl, v2.ctl, v3.ctl...
Suppose I have a binary input file that has been saved using one of these typedefs but I don't know which. I now open the file and try to read its binary contents with each of my typedefs for data type and to stop once the reading of the binary VI gives no error. Then I would translate this cluster to the definition of cluster current version by wiring through existing values and assigning values of model / default for variables that are not on the binary file.
My idea on how this could work is described here, with three versions of filetype:
For each new version of filetype I would need a new business structure although the content of the business structures is almost identical.
Because I save the file type definition version in my files, I could even simplify and use a separate case structure to update the data and fill in the dummy data:
Now the error structures are completely identical, only their inputs differ by type. How can I work around this? How can I loop over the typedefs from different cluster effectively?
I use LabView 2012 SP1.
Since you already have a version of the cluster, just read this byte digital itself and then use a case structure date back to before the version and read the entire cluster based on whatever the version of the type definition read you.
Tags: NI Software
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