How can I recover datalog records written beyond the 2 GB limit?


I found a solution.

Here are the steps I took to divide a datalog large (> 2 GB) file into two files more small datalog (each< 2="" gb)="" so="" that="" all="" records="" could="" once="" again="" be="" accessed="" by="" an="" application="" that="" employs="" datalog="" file="">

  1. Open the file datalog as a byte stream file using file open/create/replace.

  2. Search the file for a sequence of bytes corresponding to the ID of the record to the first record to retrieve using binary file reading. (I knew my type of cluster datalog this ID U32 Record marked the beginning of a record.  For efficiency reasons, I have read 100 000 bytes blocks every time and kept track of the byte offset location in the file.)

  3. Search the file for a sequence of bytes corresponding to the ID of the next record (or eof if it was the last record) to determine the size of the current record.

  4. Read the current record in a byte array using read binary file in conjunction with the Position of defined file that works correctly for files up to 4 GB in size.

  5. Repeated steps 2 through 4 for the other subset of records targeted for one of the new files datalog.

  6. For each byte array, flattened the array of bytes to a string (precede the size of the array = False) and then not flattened the binary string (data includes the size of the table = False) according to my record datalog type.

  7. Save each record not flattened (cluster) to the new file datalog.

Using the above procedure, I was able to bypass the need to create my own datalog file headers so I did not need to understand the specifications of datalog file format.

Tags: NI Software

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