Visual Basic Code of the Week (COTW)
Issue #50
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The source code in this issue is designed for Visual Basic 4.0 32-bit and above.

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In this Issue

This issue introduces a class to gather the volume information of a disk drive. It accomplishes this task by using an API call, GetVolumeInformation.


There are two properties in the cVolumeInfo class that are necessary to gather volume information. The Drive property defines the disk drive you want to gather the volume information for. An example of this would be Drive = "C" or Drive="C:". The Label property will return the Volume Label found for the Drive specified in the Drive property. If it is unable to determine the volume label it will return a blank volume label. This routine does not currently work for network volumes. A blank volume label will be returned for network volumes. If the GetVolumeInformation API returns an unhandled error, it will be passed back to the caller when the Drive property is called.

Public Property Let Drive(sDrive As String)
Public Property Get Label() As String

Sample Usage

On frmDriveType we created a ListView control called lvDrives. We also created a command button called cmdClose. This sample will scan all drives looking for volume labels

Private Sub cmdClose_Click()
    Unload Me
End Sub

Private Sub Form_Load()
End Sub

Private Sub SetupForm()
    With lvDrives
        .ColumnHeaders.Add , "Drive", "Drive"
        .ColumnHeaders.Add , "Volume Label", "Volume Label"
        .Sorted = True
        .SortKey = 0
        .View = lvwReport
    End With
End Sub

Private Sub ShowVolInfo()
    Dim x As Integer
    Dim itm As ListItem
    Dim sDrive As String
    Dim lDriveType As Long
    Dim sDriveTypeDesc As String

    For x = 65 To 90   ' drives A to Z
        sDrive = Chr$(x)

        Dim vol As New cVolumeInfo
        vol.Drive = sDrive
        ' only add drives that have labels
        If vol.Label <> "" Then
            Set itm = lvDrives.ListItems.Add(, sDrive, sDrive)
            itm.SubItems(1) = vol.Label
        End If
        Set vol = Nothing
End Sub

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