FileAttr Function [Runtime]

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Returns the access mode or the file access number of a file that was opened with the Open statement. The file access number is dependent on the operating system (OSH = Operating System Handle).

Note.png If you use a 32-Bit operating system, you cannot use the FileAttr-Function to determine the file access number.

See also: Open


FileAttr (FileNumber As Integer, Attribute As Integer)

Return value:



FileNumber: The number of the file that was opened with the Open statement.

Attribute: Integer expression that indicates the type of file information that you want to return. The following values are possible:

1: The FileAttr-Function indicates the access mode of the file.

2: The FileAttr-Function returns the file access number of the operating system.

If you specify a parameter attribute with a value of 1, the following return values apply:

1 - INPUT (file open for input)

2 - OUTPUT (file open for output)

4 - RANDOM (file open for random access)

8 - APPEND (file open for appending)

32 - BINARY (file open in binary mode).

Error Codes

5 Invalid procedure call

52 Invalid file name or file number


Sub ExampleFileAttr
Dim iNumber As Integer
Dim sLine As String
Dim aFile As String
    aFile = "c:\data.txt"
    iNumber = Freefile
    Open aFile For Output As #iNumber
    Print #iNumber, "This is a line of text"
    MsgBox FileAttr(#iNumber, 1 ),0,"Access mode"
    MsgBox FileAttr(#iNumber, 2 ),0,"File attribute"
    Close #iNumber
End Sub