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Set File Position Method

The Set File Position method sets the position of the next read or write operation in an open file. It does not return a value. If you write to a file after reading beyond the end of the file, then this method increases the file length. If a read operation attempts to specify a negative or zero position, then Visual Basic returns an error message.

Format

Seek [#]filenumber, position

The following table describes the arguments that you can use with this method.

Example

The following example reads the contents of a sequential file line by line to a carriage return, and then displays the results. The CreateFile subroutine creates the c:\temp001 file that the main subroutine uses:

(general) (declarations)
Option Explicit
Declare Sub CreateFile

Sub CreateFile
   Rem Put the numbers 10-100 into a file
   Dim x as Integer
   Open "c:\temp001" for Output as #1
   For x = 10 to 100 step 10
      Write #1, x
   Next x
   Close #1
End Sub

Sub Button_Click
   Dim testscore as String
   Dim x
   Dim y
   Dim newline
   Call CreateFile
   Open "c:\temp001" for Input as #1
   x = 1
   newline = Chr(10)
   msgtext = "The test scores are: " & newline
   Do Until x = Lof(1)
      Line Input #1, testscore
      x = x + 1
      y = Seek(1)
      If y>Lof(1) then
         x = Lof(1)
      Else
         Seek 1,y
      End If
      msgtext = msgtext & newline & testscore
   Loop
   Close #1
      Kill "c:\temp001"
End Sub