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    用VB来播放Avi、Wave、midi文件

    作者：黑客防线网安VB教程基地 来源：黑客防线网安VB教程基地 浏览次数：0

    本篇关键词：文件播放'&
    黑客防线网安网讯：Csdn上已经有好多朋友问过诸如：“如何播放Avi、Wave、midi文件”、：“谁知道用api播放avi,mpg的详细方法？要可以设定将图像放置到设定的窗体中”、“如何同时播放两个Wav文件”的问题，其...
    Csdn上已经有好多朋友问过诸如：
    “如何播放Avi、Wave、midi文件”、：
    “谁知道用api播放avi,mpg的详细方法？要可以设定将图像放置到设定的窗体中”、
    “如何同时播放两个Wav文件”
    的问题，
    其实用一个类模块就一切搞定，不需要什么控件之类的东西
    下面这个类模块,我研究后将它修改得更好用了
    将下面这个类模块存为Mmedia.cls
    '----------------------------------------------------
    Option Explicit
    '--------------TrueZq 最新更新2001-01-12---------------------
    '文件名： MMedia.cls
    '说明： : 一个多媒体类,能播放Avi、Wave、Midi文件
    '用法：
    'Dim Multimedia As New Mmedia
    'Multimedia.mmOpen "c: est.wav"
    'Multimedia.mmPlay
    '！记�。涸诔绦蚪崾保欢ㄒ肧et Multimedia=nothing释放资源�。。�
    '-----------------------------------------------------
    ' -=-=-=- 属性 -=-=-=-
    ' sFilename 当前的文件名
    ' nLength 文件长度（只读）
    ' nPosition 当前位置
    ' sStatus 当前状态（只读）
    ' bWait True/False.决定是否等待播放完
    ' -=-=-=- 方法 -=-=-=-=-
    ' mmOpen <Filename> 打开要播放的文件
    ' mmClose 关闭当前文件
    ' mmPause 暂停
    ' mmStop 停止 停止后可以跳到开始再次播放
    ' mmSeek <Position> Seeks to a position in the file
    ' mmPlay 播放
    '--------------------------------------------------------------
    Private sAlias As String '别名
    'Private hWnd As Long
    Private sFilename As String ' 当前的文件名
    Private nLength As Single ' 文件长度
    Private nPosition As Single ' 当前位置
    Private sStatus As String ' 当前状态
    Private bWait As Boolean ' 决定是否等待播放完
    Const WS_CHILD = &H40000000
    '------------ API 声明 -------------
    Private 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
    'Private Declare Function GetActiveWindow Lib "USER32" () As Integer
    '当sTheFile是一个Avi文件时，参数hWnd指定动画在哪里播放
    '若hWnd=0，则新开一个窗口播放动画。
    '如果听不到Midi音乐，请在Windows下用媒体播放器测试一下。
    '文件名不能带空格
    Public Sub mmOpen(ByVal sTheFile As String, Optional hWnd As Long = 0)
    Dim nReturn As Long
    Dim sType As String '文件类型
    Static nNum As Integer
    If sAlias <> "" Then '关闭开始打开的文件
    mmClose
    End If
    If (Dir(sTheFile) = "") Then '判断是否是一个存在的文件
    sFilename = "文件" & sTheFile & " 不存在！"
    Exit Sub
    Else
    sFilename = sTheFile
    ' nNum = nNum + 1
    End If
    ' Stop
    sAlias = sFilename '用文件名作别名，避免别名冲突！
    ' 判断文件类型
    Select Case UCase$(Right$(sTheFile, 3))
    Case "WAV"
    sType = "Waveaudio"
    Case "AVI"
    sType = "AviVideo"
    Case "MID"
    sType = "Sequencer"
    Case Else
    ' 未知文件格式，退出。
    Exit Sub
    End Select
    If sType = "AviVideo" And hWnd > 0 Then
    nReturn = mciSendString("open " & sTheFile & " ALIAS " & sAlias _
    & " TYPE AVIVideo parent " & hWnd & " style " & LTrim$(Str$(WS_CHILD)), 0&, 0, 0)
    Else
    nReturn = mciSendString("Open " & sTheFile & " ALIAS " & sAlias _
    & " TYPE " & sType, "", 0, 0)
    End If
    End Sub
    '关闭当前打开的多媒体文件
    Public Sub mmClose()
    Dim nReturn As Long
    '如果没有文件打开，则退出
    If sAlias = "" Then Exit Sub
    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
    '----------------------------------------------------
    [用法]
    1、
    比如要在窗体上播放一个动画,只需3个语句就搞定。
    Dim MmAvi As New Mmedia
    MmAvi.mmOpen "G: esourceAviTest.avi", Me.hWnd
    MmAvi.mmPlay
    2、循环播放
    Private Sub Timer1_Timer()
    Dim S As String
    S = "当前文件：" & MmAvi.filename & vbCrLf & "当前位置：" & MmAvi.Position _
    & "总长度：" & MmAvi.Length & "当前状态：" & MmAvi.Status
    Label1.Caption = S
    If MmAvi.Status = "stopped" Then MmAvi.mmRestart
    End sub
    3、同时播放几个文件（类型可以相同、可以不同）
    在Form1中加入Private MmWave(1) As New Mmedia
    在需要播放的地方加上：
    MmWave(0).mmOpen "G: esourcewavem16.wav"
    MmWave(1).mmOpen "G: esourcewaveWelcom98.wav"
    MmWave(0).mmPlay
    MmWave(1).mmPlay
    4、将动画放入一个圆形区域播放
    Dim hr As Long
    Dim usew&, useh&
    Dim MmAvi As New Mmedia
    usew& = Frame1.Width / Screen.TwipsPerPixelX
    useh& = Frame1.Height / Screen.TwipsPerPixelY
    usew = useh
    hr& = CreateEllipticRgn(0, 0, usew, useh)
    Call SetWindowRgn(Frame1.hWnd, hr, True)
    MmAvi.mmOpen "G: esourceAvistart.avi", Frame1.hWnd
    MmAvi.mmPlay
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    网站维护教程更新时间:2012-04-03 01:17:20  【打印此页】  【关闭】
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