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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
}
}
}
using System.Runtime.InteropSerices; //对DllImport类定义的命名引用
//其他代码
public class MyClass
{
[DllImport( "winmm.dll ")] //引用winmm.dll
public static extern long waveOutSetVolume(long deviceID, long Volume);
public static void Main()
{
waveOutSetVolume(0, 0xFFFF);
}
}
在winmm.dll中
第一个参数可以为0,表示首选设备
第二个参数为音量:0xFFFF为最大,0x0000为最小,其中高位(前两位)表示右声道音量,低位(后两位)表示左声道音量
[DllImport("winmm.dll")] //引用winmm.dll
public static extern long waveOutSetVolume(uint deviceID, uint Volume); //参数为uint
private void trackBar1_Scroll(object sender, EventArgs e)
{
waveOutSetVolume(0, Convert.ToUInt16(trackBar1.Value));
}