LOF - QB64 Wiki


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The LOF Function is used to find the length of an OPEN file in bytes.


bytes = LOF(filenumber)

  • LOF returns the number of bytes in an OPENed designated filenumber. File is empty if it returns 0.
  • Filenumber is the number of the opened file. # is not required.
  • Often used to determine the number of records in a RANDOM access file.
  • Can also be used to avoid reading an empty file, which would create an error.
  • LOF in QB64 can return up to 9223372036 gigabyte file sizes.

Example: Finding the number of records in a RANDOM file using a TYPE variable.

OPEN file$ FOR RANDOM AS #1 LEN = LEN(Type_variable) NumRecords% = LOF(1) \ RecordLEN%

See Example: INPUT (file mode)

See also:

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