nReturn = mciSendString("Close " & sAlias, "", 0, 0)
sAlias = ""
sFilename = ""
End Sub
'暂停
Public Sub mmPause()
Dim nReturn As Long
If sAlias = "" Then
Exit Sub
ElseIf Status = "paused" Then '如果先前已经暂停了，则解除暂停
mmPlay
Else
nReturn = mciSendString("Pause " & sAlias, "", 0, 0)
End If
'nPosition = Position
End Sub
'播放
Public Sub mmPlay()
Dim nReturn As Long
If sAlias = "" Then
Exit Sub
ElseIf Position = Length Then '如果已经到末尾
mmSeek 0 '跳到开始处
End If
If bWait Then
nReturn = mciSendString("Play " & sAlias & " wait", "", 0, 0)
Else
nReturn = mciSendString("Play " & sAlias, "", 0, 0)
End If
End Sub
'停止
'停止后跳到开始,以便再次播放
Public Sub mmStop()
Dim nReturn As Long
If sAlias = "" Then Exit Sub
nReturn = mciSendString("Stop " & sAlias, "", 0, 0)
mmSeek 0 '跳到开始位置
End Sub
'跳到指定的位置,并且处于暂停状态
'当nPosition的值>Length 或者nPosition<0时，将忽略这次操作
Public Sub mmSeek(ByVal nPosition As Single)
Dim nReturn As Long
nReturn = mciSendString("Seek " & sAlias & " to " & nPosition, "", 0, 0)
End Sub
'方法Filename返回当前打开的文件名
Property Get filename() As String
filename = sFilename
End Property
'指定要播放的文件名，然后将它打开
'对于需要指定容器的Avi文件，不要以这种方式打开。
Property Let filename(ByVal sTheFile As String)
mmOpen sTheFile
End Property
'读取属性Wait的值
'Msgbox Multimedia.Wait
Property Get Wait() As Boolean
Wait = bWait
End Property
'设置等待属性
'用法：Multimedia.Wait=True
Property Let Wait(bWaitValue As Boolean)
bWait = bWaitValue
End Property
'获得长度值
Property Get Length() As Single
Dim nReturn As Long, nLength As Integer
Dim sLength As String * 255
If sAlias = "" Then
Length = 0
Exit Property
End If
nReturn = mciSendString("Status " & sAlias & " length", sLength, 255, 0)
nLength = InStr(sLength, Chr$(0))
Length = Val(Left$(sLength, nLength - 1))
End Property
Property Let Position(ByVal nPosition As Single)
mmSeek nPosition
End Property
'获取当前位置
Property Get Position() As Single
Dim nReturn As Integer, nLength As Integer
Dim sPosition As String * 255
If sAlias = "" Then Exit Property
nReturn = mciSendString("Status " & sAlias & " position", sPosition, 255, 0)
nLength = InStr(sPosition, Chr$(0))
Position = Val(Left$(sPosition, nLength - 1))
End Property
'当前打开文件的状态
'有以下几种：playing paused stopped
Property Get Status() As String
Dim nReturn As Integer, nLength As Integer
Dim sStatus As String * 255
If sAlias = "" Then Exit Property
nReturn = mciSendString("Status " & sAlias & " mode", sStatus, 255, 0)
nLength = InStr(sStatus, Chr$(0))
Status = Left$(sStatus, nLength - 1)
End Property
'从头开始播放
Public Sub mmRestart()
Dim nReturn As Long
If sAlias = "" Then Exit Sub
mmSeek 0
mmPlay
End Sub
'类的初始化
Private Sub Class_Initialize()
' sAlias = "" '别名初值为空
End Sub
'关闭打开的多媒体设备
'当该类的对象所在的窗体（或模块）卸载时，自动调用该过程
Private Sub Class_Terminate()
mmClose
End Sub
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