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How to test for a valid mapped drive

Posted on 2002-05-14
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Last Modified: 2008-03-06
I have an applicaiton that relys on connectivity via mapped
drives to about 5 PC's.
Could you show me the code that would test those
connections to see if they are "live"?

Please note, the code cannot just detect the
existance of a mapped drive, because even if
they log off or shut the PC down, my app's PC could
still be mapped.

I need to know if the mapped drive is still valid.

Example code please ?
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Question by:rbend
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2 Comments
 
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Accepted Solution

by:
TimCottee earned 200 total points
ID: 7008253
You can use the following example to get all logical drives and some information about them. Inactive drives will return empty values whereas active ones will return the appropriate information.

Private Declare Function GetLogicalDriveStrings Lib "Kernel32" Alias "GetLogicalDriveStringsA" (ByVal nBufferLength As Long, ByVal lpBuffer As String) As Long
Private Declare Function GetVolumeInformation Lib "Kernel32" Alias "GetVolumeInformationA" (ByVal lpRootPathName As String, ByVal lpVolumeNameBuffer As String, ByVal nVolumeNameSize As Long, lpVolumeSerialNumber As Long, lpMaximumComponentLength As Long, lpFileSystemFlags As Long, ByVal lpFileSystemNameBuffer As String, ByVal nFileSystemNameSize As Long) As Long
Private Sub Form_Load()
    Dim strSave As String
    Me.AutoRedraw = True
    strSave = String(255, Chr$(0))
    ret& = GetLogicalDriveStrings(255, strSave)
    For keer = 1 To 100
        If Left$(strSave, InStr(1, strSave, Chr$(0))) = Chr$(0) Then Exit For
        Me.Print Left$(strSave, InStr(1, strSave, Chr$(0)) - 1), IsActive(Left$(strSave, InStr(1, strSave, Chr$(0)) - 1))
        strSave = Right$(strSave, Len(strSave) - InStr(1, strSave, Chr$(0)))
    Next keer
End Sub


Private Function IsActive(ByVal DriveLetter As String) As String
    Dim Serial As Long, VName As String, FSName As String
    VName = String$(255, Chr$(0))
    FSName = String$(255, Chr$(0))
    GetVolumeInformation DriveLetter, VName, 255, Serial, 0, 0, FSName, 255
    VName = Left$(VName, InStr(1, VName, Chr$(0)) - 1)
    FSName = Left$(FSName, InStr(1, FSName, Chr$(0)) - 1)
    IsActive = VName & " : " & FSName & " / " & Trim(Str(Serial))
End Function
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Author Comment

by:rbend
ID: 7008613
This is the ticket !
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