在特定时间播放声音-Winmm.dll-VB.Net

问题描述

我开始使用winmm.dll播放声音（它可以一次播放多种声音并设置音频参数），但是我找不到该库所有功能的有效列表。

我有一个包含更多音乐的Wav文件，因此我必须分别启动它们。

我有此代码：

Imports System.Text
Imports System.Runtime.InteropServices

Public class Soundplayer

<DllImport("winmm.dll")> Private Shared Function mciSendString(ByVal command As String,ByVal buffer As StringBuilder,ByVal bufferSize As Integer,ByVal hwndCallback As IntPtr) As Integer
 End Function

Public sub PlayMusicWithTime(SelectedTime as String)

    mciSendString("open " & Chr(34) & Application.StartupPath & "\Resources\Sounds\" & soundFileName & Chr(34) & " type waveaudio alias MediaSound",nothing,IntPtr.Zero)
    mciSendString("setaudio MediaSound volume to 1000",IntPtr.Zero)

    ' There should be a function here that make the sound start at the input value

    mciSendString("play MediaSound",IntPtr.Zero)

End Sub

End Class

Winmm.dll中是否有一个函数可以在特定时间开始播放声音？

解决方法

最后我找到了解决方法：

要在特定时间播放声音，我必须使用以下代码：

mciSendString（“播放MediaSound from 13000，Nothing，0，IntPtr.Zero）

在这种情况下，我从13秒开始播放

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完整代码：

Imports System.Text
Imports System.Runtime.InteropServices

Public class SoundPlayer

<DllImport("winmm.dll")> Private Shared Function mciSendString(ByVal command As String,ByVal buffer As StringBuilder,ByVal bufferSize As Integer,ByVal hwndCallback As IntPtr) As Integer
End Function

Public sub PlayMusicWithTime(SelectedTime as Integer)

    mciSendString("open Sound1.wav type waveaudio alias MediaSound",Nothing,IntPtr.Zero)
    mciSendString("setaudio MediaSound volume to 1000",IntPtr.Zero)

    mciSendString("play MediaSound from " & SelectedTime.toString,IntPtr.Zero)

End Sub

End Class