Returns a Long specifying the current read/write position within a file opened by using the Open statement.
Syntax
Seek(filenumber)
The required filenumber argument is an Integer containing a valid file number.
Remarks
Seek returns a value between 1 and 2,147,483,647 (equivalent to 2^31 - 1), inclusive.
The following describes the return values for each file access mode.
| Mode | Return value |
|---|---|
| Random | Number of the next record read or written. |
| Binary, Output, Append, Input | Byte position at which the next operation takes place. The first byte in a file is at position 1, the second byte is at position 2, and so on. |
Example
This example uses the Seek function to return the current file position. The 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 TypeFor files opened in Random mode, Seek returns the number of the next record.
Dim MyRecord As Record ' Declare variable.
Open "TESTFILE" For Random As #1 Len = Len(MyRecord)
Do While Not EOF(1) ' Loop until end of file.
Get #1, , MyRecord ' Read next record.
Debug.Print Seek(1) ' Print record number to the Immediate window.
Loop
Close #1 ' Close file.For files opened in modes other than Random mode, Seek returns the byte position at which the next operation takes place. Assume that TESTFILE is a file containing a few lines of text.
Dim MyChar
Open "TESTFILE" For Input As #1 ' Open file for reading.
Do While Not EOF(1) ' Loop until end of file.
MyChar = Input(1, #1) ' Read next character of data.
Debug.Print Seek(1) ' Print byte position to the Immediate window.
Loop
Close #1 ' Close file.