winmm.dll获取和设置声音

[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);
        }