C#控制系统音量

已调试通过,源码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace Volume
{
    public partial class Form1 : Form
    {
        [DllImport("winmm.dll")]
        public static extern long waveOutSetVolume(UInt32 deviceID, UInt32 Volume);
        [DllImport("winmm.dll")]
        public static extern long waveOutGetVolume(UInt32 deviceID, out UInt32 Volume);
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
        private void GetVolume()
        {
            UInt32 d, v;
            d = 0;
            long i = waveOutGetVolume(d, out v);
            UInt32 vleft = v & 0xFFFF;
            UInt32 vright = (v & 0xFFFF0000) >> 16;
            trackBar1.Value = (int.Parse(vleft.ToString()) | int.Parse(vright.ToString())) * (this.trackBar1.Maximum - this.trackBar1.Minimum) / 0xFFFF;
        }
        private void trackBar1_Scroll(object sender, EventArgs e)
        {
            UInt32 Value = (System.UInt32)((double)0xffff * (double)trackBar1.Value / (double)(trackBar1.Maximum - trackBar1.Minimum));//先把trackbar的value值映射到0x0000～0xFFFF范围
            //限制value的取值范围
            if (Value < 0) Value = 0;
            if (Value > 0xffff) Value = 0xffff;
            UInt32 left = (System.UInt32)Value;//左声道音量
            UInt32 right = (System.UInt32)Value;//右
            waveOutSetVolume(0, left << 16 | right); //"<<"左移，“|”逻辑或运算
        }
    }
}