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Seek statement

Table of contents
  1. Syntax
  2. Remarks
  3. Example

Sets the position for the next read/write operation within a file opened by using the Open statement.


Seek [ # ] filenumber, position

The Seek statement syntax has these parts:

Part Description
filenumber Required. Any valid file number.
position Required. Number in the range 1 – 2,147,483,647, inclusive, that indicates where the next read/write operation should occur.


Record numbers specified in Get and Put statements override file positioning performed by Seek.

Performing a file-write operation after a Seek operation beyond the end of a file extends the file. If you attempt a Seek operation to a negative or zero position, an error occurs.


This example uses the Seek statement to set the position for the next read or write within a file. This example assumes that TESTFILE is a file containing records of the user-defined type Record.

Type Record ' Define user-defined type.
    ID As Integer
    Name As String * 20
End Type

For files opened in Random mode, Seek sets the next record.

Dim MyRecord As Record, MaxSize, RecordNumber ' Declare variables.
' Open file in random-file mode.
Open "TESTFILE" For Random As #1 Len = Len(MyRecord)
MaxSize = LOF(1) \ Len(MyRecord) ' Get number of records in file.
' The loop reads all records starting from the last.
For RecordNumber = MaxSize To 1 Step -1
    Seek #1, RecordNumber ' Set position.
    Get #1, , MyRecord ' Read record.
Next RecordNumber
Close #1 ' Close file.

For files opened in modes other than Random mode, Seek sets the byte position at which the next operation takes place. This example assumes that TESTFILE is a file containing a few lines of text.

Dim MaxSize, NextChar, MyChar
Open "TESTFILE" For Input As #1 ' Open file for input.
MaxSize = LOF(1) ' Get size of file in bytes.
' The loop reads all characters starting from the last.
For NextChar = MaxSize To 1 Step -1
    Seek #1, NextChar ' Set position.
    MyChar = Input(1, #1) ' Read character.
Next NextChar
Close #1 ' Close file.

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