C# 控制系统音量,静音 (加减按钮形式)

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 VolumnSet { 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) { //减音量 SendMessage(this.Handle, WM_APPCOMMAND, 0x30292, APPCOMMAND_VOLUME_DOWN * 0x10000); } private void checkBox1_CheckedChanged(object sender, EventArgs e) { //静音 SendMessage(this.Handle, WM_APPCOMMAND, 0x200eb0, APPCOMMAND_VOLUME_MUTE * 0x10000); } } }