利用硬盘序列号计算软件注册码

  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

（出处：清风网络学院）