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Check if file is in use

Posted on 2004-12-01
Medium Priority
Last Modified: 2012-05-05

I want to check in my vb program if a specific file is in use. Only when the file isn't in use anymore, my program may continue?

Can somebody help?

Question by:Q-Tip
1 Comment
LVL 86

Accepted Solution

Mike Tomlinson earned 500 total points
ID: 12717447
What you can do is attempt to open the file with exclusive read write access.  If the attempt fails, it must be in use by another process:

Option Explicit

Private Sub Command1_Click()
    If isFileInUse(Text1.Text) Then
        Label1.Caption = "File In Use"
        Label1.Caption = "File Available"
    End If
End Sub

Private Function isFileInUse(ByVal filename As String) As Boolean
    On Error GoTo openError
    isFileInUse = False ' assume it isn't locked
    If Dir(filename) <> "" Then
        ' attempt to get exclusive access to the file
        ' if exclusive access fails, we jump to openError:
        ' and return true
        Open filename For Binary Lock Read Write As #1
        Close #1
        MsgBox filename, vbCritical, "File Not Found"
    End If
    Exit Function

isFileInUse = True
End Function

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