用VB编写一个光驱保镖

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

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