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- using System;
- using System.Collections.Generic;
- using System.ComponentModel;
- using System.Data;
- using System.Drawing;
- using System.Linq;
- using System.Runtime.InteropServices;
- using System.Text;
- using System.Threading.Tasks;
- using System.Windows.Forms;
- namespace ControlVolume.Views
- {
- public partial class Method2 : 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
- int volume;//音量
- public Method2()
- {
- InitializeComponent();
- }
- public void getVolume()
- {
- uint v;
- int p = 0;
- //IntPtr p = new IntPtr(0);
- uint i = waveOutGetVolume(p, out v);
- uint vleft = v & 0xFFFF;
- uint vright = (v & 0xFFFF0000) >> 16;
- volume = (int.Parse(vleft.ToString()) | int.Parse(vright.ToString())) * (this.trackBar1.Maximum - this.trackBar1.Minimum) / 0xFFFF;
- }
- private void button1_Click(object sender, EventArgs e)
- {
- }
- private void trackBar1_Scroll(object sender, EventArgs e)
- {
- //设置音量
- 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
- }
- }
- }
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