GetVolumeInformation

'Add this code to the form's General Declarations procedure:


Private Declare Function GetVolumeInformation Lib _
"kernel32.dll" Alias "GetVolumeInformationA" (ByVal _
lpRootPathName As String, ByVal lpVolumeNameBuffer As _
String, ByVal nVolumeNameSize As Integer, _
lpVolumeSerialNumber As Long, lpMaximumComponentLength _
As Long, lpFileSystemFlags As Long, ByVal _
lpFileSystemNameBuffer As String, ByVal _
nFileSystemNameSize As Long) As Long

Function GetSerialNumber(strDrive As String) As Long
Dim SerialNum As Long
Dim Res As Long
Dim Temp1 As String
Dim Temp2 As String
Temp1 = String$(255, Chr$(0))
Temp2 = String$(255, Chr$(0))
Res = GetVolumeInformation(strDrive, Temp1, _
Len(Temp1), SerialNum, 0, 0, Temp2, Len(Temp2))
GetSerialNumber = SerialNum
End Function

Add this code To the Command button:

Private Sub Command1_Click()
Call MsgBox(GetSerialNumber("C:\"))
End Sub