编程思路：当光驱里有光盘，立即检测此光盘是否已经注册，如不是，则弹出光驱，从而达到保护光驱的作用。
实现方法：
一.注册光盘
利用INI配置文件记录光盘的卷标号和序列号，比如一张卷标号为Sys、序列号为38972126的光盘，可在INI文件中在[CDRom]下按如下格式记录：ys=38972126。
二.检测光盘是否已经注册
用一个Timer控件监视光驱里是否有光盘，若有，则激活另一个Timer控件，由它来检测光驱里的光盘是否已经注册，然后进行相关操作。
三.获取光盘卷标和序列号
用GetDriveType判断光驱盘符、用GetVolumeInformation读取光盘的卷标和序列号。
四.弹出光驱
用mciSendString可对光驱的开、关进行操作，格式如下：
Call mciSendString("set CDAudio door open", returnstring, 127, 0)
具体步骤：
一.新建标准EXE工程，给窗体绘制如下控件：
控件 Name Caption
Timer tmrCheck
Timer tmrCd
命令按钮 cmdAdd 注册光盘
命令按钮 cmdUnlock 解除保护
二、缺省添加一个标准模块
三、编写代码如下——
'******* 模块代码：******
Option Explicit
'获取磁盘类型的API
Public Declare Function GetDriveType Lib "kernel32" Alias "GetDriveTypeA" _
(ByVal nDrive As String) As Long
'获取磁盘信息的API
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
'用于操作光驱的API
Public Declare Function mciSendString Lib "winmm.dll" Alias _
"mciSendStringA" (ByVal lpstrCommand As String, ByVal _
lpstrReturnString As String, ByVal uReturnLength As Long, _
ByVal hwndCallback As Long) As Long
'读写INI的API
Public Declare Function WritePrivateProfileString Lib _
"kernel32" Alias "WritePrivateProfileStringA" _
(ByVal lpApplicationName As String, ByVal lpKeyName _
As Any, ByVal lpString As Any, ByVal lpFileName As _
String) As Long
Public Declare Function GetPrivateProfileString Lib _
"kernel32" Alias "GetPrivateProfileStringA" (ByVal _
lpApplicationName As String, ByVal lpKeyName As Any, _
ByVal lpDefault As String, ByVal lpReturnedString As _
String, ByVal nSize As Long, ByVal lpFileName As String) _
As Long
Public Const DRIVE_CDROM = 5 '磁盘类型常量--光驱为5
'写INI函数
Public Function WriteIni(ByVal section As String, ByVal key As String, _
ByVal value As String) As Boolean
Dim x As Long, Buff As String * 128, I As Integer
Buff = value + Chr(0)
x = WritePrivateProfileString(section, key, Buff, App.Path + "\cd.ini")
WriteIni = x
End Function
'读INI函数
Public Function ReadIni(ByVal section As String, ByVal key As String) As String
Dim x As Long, Buff As String * 128, I As Integer
x = GetPrivateProfileString(section, key, "", Buff, 128, App.Path + "\cd.ini")
I = InStr(Buff, Chr(0))
ReadIni = Trim(Left(Buff, I - 1))
End Function
'****** 窗体代码：******
Option Explicit
Dim cdName As String '光驱盘符
Dim volName As String '光盘卷标
Dim Serial As String '光盘序列号
Private Sub cmdAdd_Click()
'添加光盘
Dim sR As String
On Error GoTo ErrHandle
sR = Dir(cdName & "*.*")
Readcd '读取光盘信息
Call WriteIni("CDRom", volName, Serial)
Exit Sub
ErrHandle:
Exit Sub
End Sub
Private Sub cmdUnlock_Click()
'保护/解除保护
Select Case cmdUnlock.Caption
Case "解除保护"
tmrCheck.Enabled = False
cmdUnlock.Caption = "保护模式"
Case "保护模式"
tmrCheck.Enabled = True
cmdUnlock.Caption = "解除保护"
End Select
End Sub
Private Sub Form_Load()
Dim DrvN As Integer '驱动器的ASCII码
Dim DrvType As Integer '驱动器的类别
Dim n As Integer
tmrCheck.Enabled = True
tmrCheck.Interval = 1000
tmrCd.Enabled = False
tmrCd.Interval = 1
'获取光驱盘符
DrvN = Asc("c")
For n = 0 To 10
DrvN = DrvN + 1
DrvType = GetDriveType(Chr(DrvN) & ":\")
If DrvType = 5 Then
cdName = Chr(DrvN) & ":\"
End If
Next
If cdName = "" Then '无光驱则退出
MsgBox "该计算机没有光驱，即将退出。"
End
End If
End Sub
Private Sub Readcd() '读取cd信息
Dim Vol As String * 256 '卷标
Dim FatType As String * 256 'fat格式
Dim GetVal As Long '序列号
Dim TempLon1 As Long
Dim TempLon2 As Long
Call GetVolumeInformation(cdName, Vol, 256, _
GetVal, TempLon1, TempLon2, FatType, 256)
volName = Vol: Serial = GetVal '给卷标、序列号赋值
End Sub
Private Sub tmrCheck_Timer()
Dim sR As String
On Error GoTo ErrHandle
'用Dir函数检测光驱里是否有光盘
sR = Dir(cdName & "*.*") '若有光盘
tmrCd.Enabled = True '则tmrCd有效
Exit Sub
ErrHandle: '若无则tmrCd无效
tmrCd.Enabled = False
End Sub
Private Sub tmrCd_Timer()
Dim MyStr As String, ReStr As Long
Readcd
MyStr = ReadIni("CDRom", volName)
If Serial <> MyStr Then Call mciSendString("set CDAudio door open", ReStr, 127, 0)
Me.Caption = ReStr
tmrCd.Enabled = False
End Sub
四、运行程序
将工程保存在指定目录，即可运行程序。
以上代码在PWin98、VB6.0中文企业版环境下运行通过。当然，为使程序的可操作性更强，还有许多工作要做；如果您使用以上代码编制了一个完美的光驱保镖，请发给土人一个免费的拷贝，谢谢！
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