控制系统音量

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Runtime.InteropServices;//dll引用要用到的

namespace WindowsFormsApplication2

{

    public partial class Form1 : Form

    {

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]

        static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, uint wParam, uint lParam);

        const uint WM_APPCOMMAND = 0x319;

        const uint APPCOMMAND_VOLUME_UP = 0x0a;

        const uint APPCOMMAND_VOLUME_DOWN = 0x09;

        const uint APPCOMMAND_VOLUME_MUTE = 0x08;

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {//增加音量

            SendMessage(this.Handle, WM_APPCOMMAND, 0x30292, APPCOMMAND_VOLUME_UP * 0x10000);

        }

        private void button2_Click(object sender, EventArgs e)

        {//减少音量

            SendMessage(this.Handle, WM_APPCOMMAND, 0x30292, APPCOMMAND_VOLUME_DOWN * 0x10000);

        }

        private void button3_Click(object sender, EventArgs e)

        {//静音切换

            SendMessage(this.Handle, WM_APPCOMMAND, 0x200eb0, APPCOMMAND_VOLUME_MUTE * 0x10000);

        }

        private void button1_MouseDown(object sender, MouseEventArgs e)

        {

        }

    }

}