怎样打开或关闭CD-ROM

领测软件测试网 如果你想通过VB打开或者关闭CD-ROM，你可以向Windows Multimedia DLL发出一条相关的命令请求，但是你必须先声明DLL：

在模块文件中加入以下代码：

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

以下是打开CD-ROM的过程代码：

retvalue = mcisendstring("set CDAudio door open", _

returnstring, 127, 0)

关闭CD-ROM用以下代码：

retvalue = mcisendstring("set CDAudio door closed", _returnstring, 127, 0)

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