C# 控制音量 (滚动条形式)

 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 Media{ public partial class Form1 : Form { [DllImport("Winmm.dll")] private static extern int waveOutSetVolume(int hwo, System.UInt32 pdwVolume);//设置音量 [DllImport("Winmm.dll")] private static extern uint waveOutGetVolume(int hwo,out System.UInt32 pdwVolume); //获取音量 public Form1() { InitializeComponent(); } private void get_Click(object sender, EventArgs e) { uint v; uint i = waveOutGetVolume(0,out v); uint vleft = v & 0xFFFF; uint vright = (v & 0xFFFF0000) >> 16; trackBar1.Value = (int.Parse(vleft.ToString()) | int.Parse(vright.ToString())) * (this.trackBar1.Maximum - this.trackBar1.Minimum) / 0xFFFF; } private void set_Click(object sender, EventArgs e) { System.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; System.UInt32 left = (System.UInt32)Value;//左声道音量 System.UInt32 right = (System.UInt32)Value;//右 waveOutSetVolume(0, left << 16 | right); //"<<"左移，“|”逻辑或运算 } }}