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   源码介绍

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【实例介绍】

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 VolumeControl
{
    public partial class Form1 : Form
    {
        [DllImport("winmm.dll")]
        public static extern int waveOutGetVolume(IntPtr hwo, out uint dwVolume);

        [DllImport("winmm.dll")]
        public static extern int waveOutSetVolume(IntPtr hwo, uint dwVolume);

        public Form1()
        {
            InitializeComponent();
            // By the default set the volume to 0
            uint CurrVol = 0;
            // At this point, CurrVol gets assigned the volume
            waveOutGetVolume(IntPtr.Zero, out CurrVol);
            // Calculate the volume
            ushort CalcVol = (ushort)(CurrVol & 0x0000ffff);
            // Get the volume on a scale of 1 to 10 (to fit the trackbar)
            trackWave.Value = CalcVol / (ushort.MaxValue / 10);
        }

        private void trackWave_Scroll(object sender, EventArgs e)
        {
            // Calculate the volume that's being set
            int NewVolume = ((ushort.MaxValue / 10) * trackWave.Value);
            // Set the same volume for both the left and the right channels
            uint NewVolumeAllChannels = (((uint)NewVolume & 0x0000ffff) | ((uint)NewVolume << 16));
            // Set the volume
            waveOutSetVolume(IntPtr.Zero, NewVolumeAllChannels);
        }
    }
}