LOF - mkilgore/QB64pe GitHub Wiki

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

totalBytes& = 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 9 GB (9,223,372,036 bytes) 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%

• LEN, EOF, BINARY, RANDOM, TYPE