PCRemoteControlServer/KeyCommandExecutor.cs at main · Kelobyte/PCRemoteControlServer · GitHub

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using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace PCRemoteControlServer
{
    public static class KeyCommandExecutor
    {
        public static Action<string>? Logger;

        public static void Log(string msg)
        {
            Logger?.Invoke(msg);
        }

        public static void ExecuteCommand(string command)
        {
            if (string.IsNullOrWhiteSpace(command))
            {
                Log("Empty command.");
                return;
            }

            var cmd = command.Trim().ToLowerInvariant();

            if (IsOwnProcessForegroundWindow() && cmd != "alt_tab")
            {
                Log("Ignored command [" + command + "] because server window is active.");
                return;
            }
            Log("Command: " + cmd);

            const ushort VK_MENU = 0x12;          // Alt
            const ushort VK_TAB = 0x09;           // Tab
            const ushort VK_MEDIA_PLAY_PAUSE = 0xB3;
            const ushort VK_MEDIA_NEXT_TRACK = 0xB0;
            const ushort VK_MEDIA_PREV_TRACK = 0xB1;
            const ushort VK_VOLUME_UP = 0xAF;
            const ushort VK_VOLUME_DOWN = 0xAE;
            const ushort VK_VOLUME_MUTE = 0xAD;

            try
            {
                switch (cmd)
                {
                    case "alt_tab":
                        KeySender.SendKeyDown(VK_MENU);
                        KeySender.SendKey(VK_TAB);
                        KeySender.SendKeyUp(VK_MENU);
                        break;

                    case "media_play_pause":
                        KeySender.SendKey(VK_MEDIA_PLAY_PAUSE);
                        break;

                    case "media_next":
                        KeySender.SendKey(VK_MEDIA_NEXT_TRACK);
                        break;

                    case "media_prev":
                        KeySender.SendKey(VK_MEDIA_PREV_TRACK);
                        break;

                    case "vol_up":
                        KeySender.SendKey(VK_VOLUME_UP);
                        break;

                    case "vol_down":
                        KeySender.SendKey(VK_VOLUME_DOWN);
                        break;

                    case "vol_mute":
                        KeySender.SendKey(VK_VOLUME_MUTE);
                        break;

                    case "shift_period":
                        KeySender.SendKeyDown(0x10); // Shift key
                        KeySender.SendKey(0xBE); // '.' key
                        KeySender.SendKeyUp(0x10); // Release Shift key
                        break;

                    case "shift_comma":
                        KeySender.SendKeyDown(0x10); // Shift key
                        KeySender.SendKey(0xBC); // ',' key
                        KeySender.SendKeyUp(0x10); // Release Shift key
                        break;

                    case "arrow_left":
                        KeySender.SendKey(0x25); // Left Arrow key
                        break;

                    case "arrow_right":
                        KeySender.SendKey(0x27); // Right Arrow key
                        break;

                    case "arrow_up":
                        KeySender.SendKey(0x26); // Up Arrow key
                        break;

                    case "arrow_down":
                        KeySender.SendKey(0x28); // Down Arrow key
                        break;

                    case "esc":
                        KeySender.SendKey(0x1B); // Escape key
                        break;

                    case "f":
                        KeySender.SendKey(0x46); // 'F' key
                        break;

                    case "m":
                        KeySender.SendKey(0x4D); // 'M' key
                        break;

                    case "space":
                        KeySender.SendKey(0x20); // Space key
                        break;

                    default:
                        Log("Unknown command: " + cmd);
                        break;
                }
            }
            catch (Exception ex)
            {
                Log("Error executing command: " + ex.Message);
            }
        }

        private static bool IsOwnProcessForegroundWindow()
        {
            IntPtr hwnd = GetForegroundWindow();
            if (hwnd == IntPtr.Zero)
                return false;

            _ = GetWindowThreadProcessId(hwnd, out uint pid);
            return pid == (uint)Process.GetCurrentProcess().Id;
        }

        [DllImport("user32.dll")]
        private static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll")]
        private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
    }
}