在模块中加入下列声明：
Public 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
''得到某一磁盘分区的信息，如C：
窗体代码如下：
Option Explicit
Private Regid, Localid As Long
Private Sub CmdLocalID_Click()
''根据C盘序列号得到原ID
Dim Driver, VolName, Fsys As String
Dim volNumber, MCM, FSF As Long
Driver = "c:\"
Dim res As Long
res = GetVolumeInformation(Driver, VolName, 127, volNumber, MCM, FSF, Fsys, 127)
''volNumber是C盘序列号
Localid = volNumber / 2 + 123456789
Text1.Text = Localid
End Sub
Private Sub CmdRegID_Click()
''根据原ID算出注册ID
If IsNumeric(Text1.Text) Then
Regid = CLng(Text1.Text) / 4 * 3 + 987654321
Else
''error
End If
Text2.Text = Regid
End Sub
Private Sub CmndCheckID_Click()
''验证注册ID
Dim Driver, VolName, Fsys As String
Dim volNumber, MCM, FSF As Long
Driver = "c:\"
Dim res As Long
res = GetVolumeInformation(Driver, VolName, 127, volNumber, MCM, FSF, Fsys, 127)
Dim Tid As Long
Tid = volNumber / 2 + 123456789
If Regid = Tid / 4 * 3 + 987654321 Then
MsgBox "正确！"
Else
MsgBox "错误！"
End If
End Sub
为便于演示，我在窗体上用了两个文本框三个按钮，请根据情况灵活使用，可以在用户端算出原ID，发给你，你算出注册ID再发给用户，验证当然是在用户端啦。ID算法很简单，只作示范。此注册ID只能在这一台机器上使用，对于非高手用户来说是足够啦。
注：如用户格式化C：盘后需重新获得ID。
