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      • vb.net教程之VB.NET中聲音的播放

      • 2017-06-06 23:21 來源:未知
      由VB6升級為.NET后,有些人不清楚聲音的處理,比如程序出錯的時候,自定義一個聲音播放,或者程序的背景音樂、包括游戲音樂等等。下面介紹幾種在VB.NET中計較簡單可以實現的方案:



      1.  Beep

      最簡單的一種方法,通過計算機的揚聲器發出聲響, 聲響的音高與持續時間取決于硬件和系統軟件,從而隨計算機不同而不同。

      Beepg跟Msgbox等方法位于Microsoft.VisualBasic.Interaction 中,一般默認系統會自動加載。調用很簡單,看下面的例子。

      Dim I As Integer

      For I = 1 To 100   ' Loop 100 times.

           Beep()      '  Sound a tone.

      Next I



      2. 用Win32 API PlaySound

      PlaySound位于"winmm.dll"中,可以根據輸入參數的不同,播放WAV類型的音樂。在VB.NET中調用跟VB6中差不多:

      先聲明:

      Private Declare Auto Function PlaySound Lib "winmm.dll" (ByVal lpszSoundName As String, ByVal hModule As Integer, ByVal dwFlags As Integer) As Integer



      Const SND_FILENAME As Integer = &H20000

      Const SND_ALIAS As Integer = &H10000

      Const SND_SYNC As Integer = &H0

      具體還有很多常量,不一一列舉,下面是播放一個wav文件的例子

      Dim mstrfileName As String = "c:\eagle2.wav"

      PlaySound(mstrfileName, 0, SND_FILENAME)



      注意上面的播放是非同步的,就是說它并不會播放完畢才結束。如果把上面的代碼寫在一個Button.Click的事件處理程序中,第二次點擊的時候它會打斷第一次的播放,重新開始。



      當然我們也可以調用系統的聲音:

      PlaySound("SystemStart", 0, SND_ALIAS Or SND_SYNC)

      ' 以同步的方式調用系統啟動時候的聲音。



      3.  調用媒體播放器控件



      VB.NET中并沒有提供媒體播放器的.NET組件,沒辦法我們還是調用以前Com組件Windows Media Player。當然除了聲音外,還可以播放視頻文件。

      首先把媒體播放器控件加到工具欄中,調用還是簡單的寫一下吧:)



      Private Sub playMediaFile(ByVal mediaFileName As String)

        With MediaPlayer1

         .Stop()

         .FileName = "c:\mp3\愛不愛我.mp3"

         .Play()

        End With

      End Sub



      總結:雖然VB.NET比VB6改變了很多,包括真正的OOP,多線程等等,但是總歸還是跟VB有很多聯系,建議大家碰到難于解決的問題的時候,試一下以前的處理方式,一般都能奏效

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