CaplockNumlock/NativeMethods.cs at master · itsnateai/CaplockNumlock · GitHub

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using System.Runtime.InteropServices;

namespace CapsNumTray;

internal static class NativeMethods
{
    // Shell_NotifyIconW
    public const uint NIM_ADD = 0x00;
    public const uint NIM_MODIFY = 0x01;
    public const uint NIM_DELETE = 0x02;
    public const uint NIM_SETVERSION = 0x04;

    public const uint NIF_MESSAGE = 0x01;
    public const uint NIF_ICON = 0x02;
    public const uint NIF_TIP = 0x04;
    public const uint NIF_SHOWTIP = 0x80;

    public const uint NOTIFYICON_VERSION_4 = 4;

    // Window messages
    public const uint WM_TRAY = 0x8010;
    public const int WM_LBUTTONUP = 0x0202;
    public const int WM_RBUTTONUP = 0x0205;
    public const int WM_CONTEXTMENU = 0x007B;

    // Icon loading
    public const uint IMAGE_ICON = 1;
    public const uint LR_LOADFROMFILE = 0x0010;

    // Virtual keys
    public const byte VK_CAPITAL = 0x14;
    public const byte VK_NUMLOCK = 0x90;
    public const byte VK_SCROLL = 0x91;

    public const uint KEYEVENTF_EXTENDEDKEY = 0x0001;
    public const uint KEYEVENTF_KEYUP = 0x0002;

    // Low-level keyboard hook
    public const int WH_KEYBOARD_LL = 13;
    public const int WM_KEYDOWN = 0x0100;
    public const int WM_KEYUP = 0x0101;
    public const int WM_SYSKEYDOWN = 0x0104;
    public const int WM_SYSKEYUP = 0x0105;

    public delegate nint LowLevelKeyboardProc(int nCode, nint wParam, nint lParam);

    [DllImport("shell32.dll", CharSet = CharSet.Unicode)]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool Shell_NotifyIconW(uint dwMessage, ref NOTIFYICONDATAW lpData);

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    public static extern uint RegisterWindowMessage(string lpString);

    [DllImport("user32.dll")]
    public static extern uint GetDpiForWindow(nint hwnd);

    [DllImport("user32.dll")]
    public static extern uint GetDpiForSystem();

    [DllImport("user32.dll")]
    public static extern nint LoadImage(nint hInst, string name, uint type, int cx, int cy, uint fuLoad);

    [DllImport("user32.dll")]
    public static extern nint LoadIcon(nint hInstance, nint lpIconName);

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool DestroyIcon(nint hIcon);

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool SetForegroundWindow(nint hWnd);

    [DllImport("user32.dll")]
    public static extern short GetKeyState(int nVirtKey);

    [DllImport("user32.dll")]
    public static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, nuint dwExtraInfo);

    [DllImport("kernel32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool Beep(uint dwFreq, uint dwDuration);

    [DllImport("user32.dll", SetLastError = true)]
    public static extern nint SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, nint hMod, uint dwThreadId);

    [DllImport("user32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool UnhookWindowsHookEx(nint hhk);

    [DllImport("user32.dll")]
    public static extern nint CallNextHookEx(nint hhk, int nCode, nint wParam, nint lParam);

    [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
    public static extern nint GetModuleHandle(string? lpModuleName);

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct NOTIFYICONDATAW
    {
        public uint cbSize;
        public nint hWnd;
        public uint uID;
        public uint uFlags;
        public uint uCallbackMessage;
        public nint hIcon;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
        public string szTip;
        public uint dwState;
        public uint dwStateMask;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
        public string szInfo;
        public uint uVersion; // union with uTimeout
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 64)]
        public string szInfoTitle;
        public uint dwInfoFlags;
        public Guid guidItem;
        public nint hBalloonIcon;
    }
}