在c#中通过wmplib更改mp3播放的音量

Question

是否可以改变通过wmplib播放的mp3文件的音量？改变程序本身的音量也没问题。

有什么解决方案可以解决这个问题吗？

Answer 1

这个想法是发送WM_APPCOMMAND message (也可以参见this answer)。

对于WPF，使用WindowInteropHelper获取Window的Handle

class MainWindow : Window
{
    ...

    private const int APPCOMMAND_VOLUME_MUTE = 0x80000;
    private const int WM_APPCOMMAND = 0x319;
    private const int APPCOMMAND_VOLUME_UP = 10 * 65536;
    private const int APPCOMMAND_VOLUME_DOWN = 9 * 65536;

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

    private void VolumeUp()
    {
        // APPCOMMAND_VOLUME_UP or APPCOMMAND_VOLUME_DOWN
        var windowInteropHelper = new WindowInteropHelper(this);
        SendMessageW(windowInteropHelper.Handle, (IntPtr)WM_APPCOMMAND, windowInteropHelper.Handle, (IntPtr)APPCOMMAND_VOLUME_UP);
    }
}

对于Windows窗体，请使用Control.Handle Property

class MainForm : Form
{
    ...

    private void VolumeUp()
    {
        SendMessageW(Handle, (IntPtr)WM_APPCOMMAND, Handle, (IntPtr)APPCOMMAND_VOLUME_UP);
    }
}

Answer 2

这是一种简单的方法。

示例：

WMPlib.WindowsMediaPlayer wmp = new WMPlib.WindowsMediaPlayer(); //Creates an instance of the WMP
wmp.url="URI to media source"; //Sets media source
wmp.settings.volume= 50;  //Volume can be 0-100 (inclusive)

希望对你有帮助！

Answer 3

这对我很有效！

WMPLib.WindowsMediaPlayer wmsound= new WMPLib.WindowsMediaPlayer();

wmsound.URL = @"C:\Users\USER\sound.mp3";

//Volume 100%
finish_sound.settings.volume = 100;