C#控制系统音量

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) { // 设置滑块值为当前音量的值 GetVolume() ; } // 设置当前音量值到滑动条上 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; } // 滑块值改变时，修改音量值 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 } } }