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：
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
将上述程序代码编译后运行，在出现类似“错误!你的C盘ID号是172498135”对话框时，按下Ctrl+Alt+Del键，看看程序名叫“HiddenMen”是否在任务管理器名单列表里。如果把上述程序稍加改动，可以加到自己特定的程序中去。该程序在隐形运行之中，不知不觉就完成了预定功能。
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