View Full Version : Disconnected Drive

05-28-2008, 02:27 PM
I have a drive mapped to a location that is only available via vpn, the rest of the time it is still mapped but disconnected. When I use the FileSystemObject.Drive.IsReady method, it takes it about 30 seconds to return a value if the drive is disconnected. Is there a faster way to tell if a drive has been disconnected?

Question is also posted at: http://www.xtremevbtalk.com/showthread.php?p=1289423#post1289423

05-30-2008, 11:48 AM
Yeah I know this is lame, but it is a quick and dirty. Se if it will work for you. :)

Public Function CheckForDrive(iDrvToCheck As String) As Boolean
Dim a As String
a = Dir(iDrvToCheck)
If a > "" Then CheckForDrive = True
End Function
'tester sub
Sub LookAtIt()
If CheckForDrive("Q:\") Then MsgBox "It is there!! Get to work!"
If CheckForDrive("C:\") Then MsgBox "It is there!! Get to work!"
End Sub

05-30-2008, 01:00 PM
Not lame :) Works fine. Sadly, works as slow as fso.

05-30-2008, 02:52 PM
Bummer, I was thinking that the fso was trying to fire up a hibernating drive before returning the .IsReady as false.

Just as another shot in the dark have you tried anything with the vpn itself? Wouldn't the software be running(in memory) if the vpn is active or connected? Could you check the running processes for it?

I have all kinds of questions and nothing to play with or test on. Such a sad sad state of affairs LOL

06-01-2008, 02:30 AM
Just a thought, but I would guess a timeout is employed while the code tries to connect. Could you use a timer loop, if not found in 5 secs, then move on?

06-01-2008, 09:56 AM
I think I have a partial solution going with Shell32. When a drive is disconnected this can tell for sure. It's flaw is that if once you are connected to VPN it's status won't update to connected until the first time you try to access a folder in the drive. So if it says it's connected it's probably true, while if it says it's disconnected, you will still have to verify that by getting a folder and then testing again.

Option Explicit

Public Enum DriveStatus
Unknown = 0
Connected = 1
Disconnected = 2
End Enum

Sub Test()
MsgBox PrelimDriveCheck("G:")
End Sub

Public Function PrelimDriveCheck(Optional ByVal driveLetter As String = "C:") As DriveStatus
Const strCln_c As String = ":"
Const strConDrv_c As String = "Network Drive"
Const strDConDrv_c As String = "Disconnected " & strConDrv_c
'Uses Shell32.dll
Dim shl As Shell32.Shell
Dim fldr As Shell32.Folder3
Dim eRtnVal As DriveStatus
On Error GoTo Err_Hnd
If Not CBool(InStrB(driveLetter, strCln_c)) Then
driveLetter = driveLetter & strCln_c
End If
Set shl = New Shell32.Shell
Set fldr = shl.Namespace(driveLetter)
If Not fldr Is Nothing Then
Select Case fldr.Self.Type
Case strDConDrv_c
eRtnVal = Disconnected
Case strConDrv_c
eRtnVal = Connected
Case Else
eRtnVal = Unknown
End Select
End If
On Error Resume Next
Set fldr = Nothing
Set shl = Nothing
PrelimDriveCheck = eRtnVal
Exit Function
MsgBox Err.Description, vbSystemModal, "Error: " & Err.Number
Resume Exit_Proc
End Function