学步园

 using System;<br /> using System.Collections.Generic;<br /> using System.ComponentModel;<br /> using System.Data;<br /> using System.Drawing;<br /> using System.Text;<br /> using System.Windows.Forms;<br /> using System.Runtime.InteropServices;</p> <p>namespace Media<br /> {<br /> public partial class Form1 : Form<br /> {<br /> [DllImport("Winmm.dll")]<br /> private static extern int waveOutSetVolume(int hwo, System.UInt32 pdwVolume);//设置音量</p> <p> [DllImport("Winmm.dll")]<br /> private static extern uint waveOutGetVolume(int hwo,out System.UInt32 pdwVolume); //获取音量</p> <p> public Form1()<br /> {<br /> InitializeComponent();<br /> }</p> <p> private void get_Click(object sender, EventArgs e)<br /> {<br /> uint v;<br /> uint i = waveOutGetVolume(0,out v);<br /> uint vleft = v & 0xFFFF;<br /> uint vright = (v & 0xFFFF0000) >> 16;<br /> trackBar1.Value = (int.Parse(vleft.ToString()) | int.Parse(vright.ToString())) * (this.trackBar1.Maximum - this.trackBar1.Minimum) / 0xFFFF;<br /> }</p> <p> private void set_Click(object sender, EventArgs e)<br /> {<br /> 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<br /> //限制value的取值范围<br /> if (Value < 0) Value = 0;<br /> if (Value > 0xffff) Value = 0xffff;<br /> System.UInt32 left = (System.UInt32)Value;//左声道音量<br /> System.UInt32 right = (System.UInt32)Value;//右<br /> waveOutSetVolume(0, left << 16 | right); //"<<"左移，“|”逻辑或运算<br /> }<br /> }<br /> }