C# 控制音量大小

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 聲音大小

{

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)

{

//加音量

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

}

private void button2_Click(object sender, EventArgs e)

{

//減音量

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

}

private void button3_Click(object sender, EventArgs e)

{

//靜音

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

}

}

}