控制系统音量代码,CSharp代码库,德仔网

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【CSharp】控制系统音量

作者:dezai / 发布于2014/1/28/ 434

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，&ldquo;|&rdquo;逻辑或运算 
    } 
  } 
}

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