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# Lof Function

Returns the size of an open file in bytes.

## Syntax:

    Lof (FileNumber)

## Return value:

Long

## Parameters:

FileNumber: Any numeric expression that contains the file number that is specified in the Open statement.

To obtain the length of a file that is not open, use the FileLen function.

## Error codes:

5 Invalid procedure call

52 Invalid file name or file number

## Example:

    Sub ExampleRandomAccess
    Dim iNumber As Integer
    Dim sText As Variant REM must be a Variant
    Dim aFile As String
        aFile = "c:\data.txt"
        iNumber = Freefile
        Open aFile For Random As #iNumber Len=32
        Seek #iNumber,1 REM Position at start
        Put #iNumber,, "This is the first line of text" REM Fill with text
        Put #iNumber,, "This is the second line of text"
        Put #iNumber,, "This is the third line of text"
        Seek #iNumber,2
        Get #iNumber,,sText
        Print sText
        Close #iNumber
        iNumber = Freefile
        Open aFile For Random As #iNumber Len=32
        Get #iNumber,2,sText
        Put #iNumber,,"This is a new line of text"
        Get #iNumber,1,sText
        Get #iNumber,2,sText
        Put #iNumber,20,"This is the text in record 20"
        Print Lof(#iNumber)
        Close #iNumber
    End Sub