只为我的应用程序静音SoundPlayer

Question

我希望仅为我的WPF应用程序静音,并在用户设置时保留整个调音台.

我可以使用以下代码将系统范围的声音静音/取消静音.

但是我注意到当我的应用程序正在运行并且正在播放声音时,我的应用程序出现在Windows调音台中,我可以通过调音台的UI将我的应用程序静音/取消静音,因此我的应用程序似乎可以通过编程方式进行操作.

private const int APPCOMMAND_VOLUME_MUTE = 0x80000;
private const int WM_APPCOMMAND = 0x319;

[DllImport("user32.dll")]
public static extern IntPtr SendMessageW(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle, (IntPtr) APPCOMMAND_VOLUME_MUTE);

Answer 1

这适用于Vista/7/8,其中有每个应用程序音量控制

DllImport("winmm.dll")]
private static extern int waveOutGetVolume(IntPtr hwo, out uint dwVolume);

[DllImport("winmm.dll")]
private static extern int waveOutSetVolume(IntPtr hwo, uint dwVolume);

/// <summary>
/// Returns volume from 0 to 10
/// </summary>
/// <returns>Volume from 0 to 10</returns>
public static int GetVolume()
{
  uint CurrVol = 0;
  waveOutGetVolume(IntPtr.Zero, out CurrVol);
  ushort CalcVol = (ushort)(CurrVol & 0x0000ffff);
  int volume = CalcVol / (ushort.MaxValue / 10);
  return volume;
}

/// <summary>
/// Sets volume from 0 to 10
/// </summary>
/// <param name="volume">Volume from 0 to 10</param>
public static void SetVolume(int volume)
{
  int NewVolume = ((ushort.MaxValue / 10) * volume);
  uint NewVolumeAllChannels = (((uint)NewVolume & 0x0000ffff) | ((uint)NewVolume << 16));
  waveOutSetVolume(IntPtr.Zero, NewVolumeAllChannels);
}