使用Windows API控制電腦靜音與音量
使用Windows API控制電腦靜音與音量

       // 宣告常式 
        private const int APPCOMMAND_VOLUME_MUTE = 0x80000; 
        private const int APPCOMMAND_VOLUME_UP = 0x0a0000; 
        private const int APPCOMMAND_VOLUME_DOWN = 0x090000;  
        private const int WM_APPCOMMAND = 0x319; 
 
        [DllImport("user32.dll")] 
        public static extern IntPtr SendMessageW(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam); 
         
        private void btnVup_Click(object sender, EventArgs e) 
        { 
            // 聲音變大 
            SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle, (IntPtr)APPCOMMAND_VOLUME_UP); 
        } 
 
        private void btnVdown_Click(object sender, EventArgs e) 
        { 
            // 聲音變小 
            SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle, (IntPtr)APPCOMMAND_VOLUME_DOWN); 
        } 
 
        private void btnMute_Click(object sender, EventArgs e) 
        { 
            // 靜音 
            SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle, (IntPtr)APPCOMMAND_VOLUME_MUTE); 
        }