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在模块Module1中加入如下声明：

Public Declare Function GetCurrentProcessId Lib “kernel32” () As Long

’获得当前进程ID函数的声明

Public Declare Function RegisterServiceProcess Lib “kernel32” (ByVal ProcessId As Long, ByVal ServiceFlags As Long) As Long

’在系统中注册当前进程ID函数的声明

3. 在Project1中新建一个窗体Form1，设置Form1的属性：

form1.Visible=False

form1.ShowInTaskBar=False

在代码窗口添加如下代码：

Private Declare Function GetDriveType Lib “kernel32” Alias “GetDriveTypeA” (ByVal nDrive As String) As Long

’获得当前驱动器类型函数的声明

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

’获得当前驱动器信息函数的声明

Private Sub Form_Load()

Dim drive_no As Long, drive_flag As Long

Dim drive_chr As String, drive_disk As String

Dim serial_no As Long, kkk As Long

Dim stemp3 As String, dflag As Boolean

Dim strlabel As String, strtype As String，strc As Long

RegisterServiceProcess GetCurrentProcessId, 1 ’ 从系统中取消当前进程

strlabel = String(255, Chr(0))

strtype = String(255, Chr(0))

stemp3 = “172498135” ’这是作者C盘的序列号（十进制）,读者可根据自己情况更改。

dflag = False

For drive_no = 0 To 25

　drive_disk = Chr(drive_no + 67)

　drive_chr = drive_disk & “:\”

　drive_flag = GetDriveType(drive_chr)

　If drive_flag = 3 Then

　　 kkk = GetVolumeInformation(drive_chr, strlabel, Len(strlabel), serial_no, 0, 0, strtype, Len(strtype)) ’通过GetVolumeInformation获得磁盘序列号

　Select Case drive_no

　　 Case 0

　　 strc = serial_no

　End Select

　If serial_no = stemp3 Then

　　 dflag = True

　　 Exit For

　End If

End If

Next drive_no

If drive_no = 26 And dflag = False Then ’非法用户

　GoTo err:

End If

MsgBox (“HI，合法用户！”)

Exit Sub

err:

　MsgBox (“错误!你的C：盘ID号是” & strc)

End Sub

Private Sub Form_Unload(Cancel As Integer)

RegisterServiceProcess GetCurrentProcessId, 0 ’从系统中取消当前程序的进程

End Sub