Win32クラス

とりあえず今必要な最低限のもの。ずっと未来にはちゃんとWinUser.h、WinTypes.hあたりを完全移植に近づけたいが・・・数が半端じゃないなあ(苦笑。
SetWindowsHookExには最後の引数でモジュールIDとかスレッドIDを渡すところがあるんだが、今のところ自分自身のメインスレッドをコールバックにする以外に使いそうな気がしないので引数無しのラッパーを実装してこっちを公開(Public)としておいた。せっかくラッパーにしたのでHook失敗したら例外投げる処理もいれた。

using System;
using System.Drawing;                   // Size, Point, ...
using System.Runtime.InteropServices;   // DllImport, Marshal
using System.ComponentModel;            // Win32Exception

namespace garu.Util
{
    public static class Win32
    {
        public enum WM
        {
            NULL = 0x0000,
            CREATE = 0x0001,
            DESTROY = 0x0002,
            MOVE = 0x0003,
            SIZE = 0x0005,
            ACTIVATE = 0x0006,
            SETFOCUS = 0x0007,
            KILLFOCUS = 0x0008,
            ENABLE = 0x000A,
            SETREDRAW = 0x000B,
            SETTEXT = 0x000C,
            GETTEXT = 0x000D,
            GETTEXTLENGTH = 0x000E,
            PAINT = 0x000F,
            CLOSE = 0x0010,
            QUERYENDSESSION = 0x0011,
            QUERYOPEN = 0x0013,
            ENDSESSION = 0x0016,
            QUIT = 0x0012,
            ERASEBKGND = 0x0014,
            SYSCOLORCHANGE = 0x0015,
            SHOWWINDOW = 0x0018,
            WININICHANGE = 0x001A,
            SETTINGCHANGE = WININICHANGE,
            DEVMODECHANGE = 0x001B,
            ACTIVATEAPP = 0x001C,
            FONTCHANGE = 0x001D,
            TIMECHANGE = 0x001E,
            CANCELMODE = 0x001F,
            SETCURSOR = 0x0020,
            MOUSEACTIVATE = 0x0021,
            CHILDACTIVATE = 0x0022,
            QUEUESYNC = 0x0023,
            GETMINMAXINFO = 0x0024,
            PAINTICON = 0x0026,
            ICONERASEBKGND = 0x0027,
            NEXTDLGCTL = 0x0028,
            SPOOLERSTATUS = 0x002A,
            DRAWITEM = 0x002B,
            MEASUREITEM = 0x002C,
            DELETEITEM = 0x002D,
            VKEYTOITEM = 0x002E,
            CHARTOITEM = 0x002F,
            SETFONT = 0x0030,
            GETFONT = 0x0031,
            SETHOTKEY = 0x0032,
            GETHOTKEY = 0x0033,
            QUERYDRAGICON = 0x0037,
            COMPAREITEM = 0x0039,
            GETOBJECT = 0x003D,
            COMPACTING = 0x0041,
            COMMNOTIFY = 0x0044,
            WINDOWPOSCHANGING = 0x0046,
            WINDOWPOSCHANGED = 0x0047,
            POWER = 0x0048,
            COPYDATA = 0x004A,
            CANCELJOURNAL = 0x004B,
            NOTIFY = 0x004E,
            INPUTLANGCHANGEREQUEST = 0x0050,
            INPUTLANGCHANGE = 0x0051,
            TCARD = 0x0052,
            HELP = 0x0053,
            USERCHANGED = 0x0054,
            NOTIFYFORMAT = 0x0055,
            CONTEXTMENU = 0x007B,
            STYLECHANGING = 0x007C,
            STYLECHANGED = 0x007D,
            DISPLAYCHANGE = 0x007E,
            GETICON = 0x007F,
            SETICON = 0x0080,
            NCCREATE = 0x0081,
            NCDESTROY = 0x0082,
            NCCALCSIZE = 0x0083,
            NCHITTEST = 0x0084,
            NCPAINT = 0x0085,
            NCACTIVATE = 0x0086,
            GETDLGCODE = 0x0087,
            SYNCPAINT = 0x0088,
            NCMOUSEMOVE = 0x00A0,
            NCLBUTTONDOWN = 0x00A1,
            NCLBUTTONUP = 0x00A2,
            NCLBUTTONDBLCLK = 0x00A3,
            NCRBUTTONDOWN = 0x00A4,
            NCRBUTTONUP = 0x00A5,
            NCRBUTTONDBLCLK = 0x00A6,
            NCMBUTTONDOWN = 0x00A7,
            NCMBUTTONUP = 0x00A8,
            NCMBUTTONDBLCLK = 0x00A9,
            NCXBUTTONDOWN = 0x00AB,
            NCXBUTTONUP = 0x00AC,
            NCXBUTTONDBLCLK = 0x00AD,
            INPUT_DEVICE_CHANGE = 0x00FE,
            INPUT = 0x00FF,
            KEYFIRST = 0x0100,
            KEYDOWN = 0x0100,
            KEYUP = 0x0101,
            CHAR = 0x0102,
            DEADCHAR = 0x0103,
            SYSKEYDOWN = 0x0104,
            SYSKEYUP = 0x0105,
            SYSCHAR = 0x0106,
            SYSDEADCHAR = 0x0107,
            UNICHAR = 0x0109,
            KEYLAST = 0x0109,
            IME_STARTCOMPOSITION = 0x010D,
            IME_ENDCOMPOSITION = 0x010E,
            IME_COMPOSITION = 0x010F,
            IME_KEYLAST = 0x010F,
            INITDIALOG = 0x0110,
            COMMAND = 0x0111,
            SYSCOMMAND = 0x0112,
            TIMER = 0x0113,
            HSCROLL = 0x0114,
            VSCROLL = 0x0115,
            INITMENU = 0x0116,
            INITMENUPOPUP = 0x0117,
            MENUSELECT = 0x011F,
            MENUCHAR = 0x0120,
            ENTERIDLE = 0x0121,
            MENURBUTTONUP = 0x0122,
            MENUDRAG = 0x0123,
            MENUGETOBJECT = 0x0124,
            UNINITMENUPOPUP = 0x0125,
            MENUCOMMAND = 0x0126,
            CHANGEUISTATE = 0x0127,
            UPDATEUISTATE = 0x0128,
            QUERYUISTATE = 0x0129,
            CTLCOLORMSGBOX = 0x0132,
            CTLCOLOREDIT = 0x0133,
            CTLCOLORLISTBOX = 0x0134,
            CTLCOLORBTN = 0x0135,
            CTLCOLORDLG = 0x0136,
            CTLCOLORSCROLLBAR = 0x0137,
            CTLCOLORSTATIC = 0x0138,
            MOUSEFIRST = 0x0200,
            MOUSEMOVE = 0x0200,
            LBUTTONDOWN = 0x0201,
            LBUTTONUP = 0x0202,
            LBUTTONDBLCLK = 0x0203,
            RBUTTONDOWN = 0x0204,
            RBUTTONUP = 0x0205,
            RBUTTONDBLCLK = 0x0206,
            MBUTTONDOWN = 0x0207,
            MBUTTONUP = 0x0208,
            MBUTTONDBLCLK = 0x0209,
            MOUSEWHEEL = 0x020A,
            XBUTTONDOWN = 0x020B,
            XBUTTONUP = 0x020C,
            XBUTTONDBLCLK = 0x020D,
            MOUSEHWHEEL = 0x020E,
            MOUSELAST = 0x020E,
            PARENTNOTIFY = 0x0210,
            ENTERMENULOOP = 0x0211,
            EXITMENULOOP = 0x0212,
            NEXTMENU = 0x0213,
            SIZING = 0x0214,
            CAPTURECHANGED = 0x0215,
            MOVING = 0x0216,
            POWERBROADCAST = 0x0218,
            DEVICECHANGE = 0x0219,
            MDICREATE = 0x0220,
            MDIDESTROY = 0x0221,
            MDIACTIVATE = 0x0222,
            MDIRESTORE = 0x0223,
            MDINEXT = 0x0224,
            MDIMAXIMIZE = 0x0225,
            MDITILE = 0x0226,
            MDICASCADE = 0x0227,
            MDIICONARRANGE = 0x0228,
            MDIGETACTIVE = 0x0229,
            MDISETMENU = 0x0230,
            ENTERSIZEMOVE = 0x0231,
            EXITSIZEMOVE = 0x0232,
            DROPFILES = 0x0233,
            MDIREFRESHMENU = 0x0234,
            IME_SETCONTEXT = 0x0281,
            IME_NOTIFY = 0x0282,
            IME_CONTROL = 0x0283,
            IME_COMPOSITIONFULL = 0x0284,
            IME_SELECT = 0x0285,
            IME_CHAR = 0x0286,
            IME_REQUEST = 0x0288,
            IME_KEYDOWN = 0x0290,
            IME_KEYUP = 0x0291,
            MOUSEHOVER = 0x02A1,
            MOUSELEAVE = 0x02A3,
            NCMOUSEHOVER = 0x02A0,
            NCMOUSELEAVE = 0x02A2,
            WTSSESSION_CHANGE = 0x02B1,
            TABLET_FIRST = 0x02c0,
            TABLET_LAST = 0x02df,
            CUT = 0x0300,
            COPY = 0x0301,
            PASTE = 0x0302,
            CLEAR = 0x0303,
            UNDO = 0x0304,
            RENDERFORMAT = 0x0305,
            RENDERALLFORMATS = 0x0306,
            DESTROYCLIPBOARD = 0x0307,
            DRAWCLIPBOARD = 0x0308,
            PAINTCLIPBOARD = 0x0309,
            VSCROLLCLIPBOARD = 0x030A,
            SIZECLIPBOARD = 0x030B,
            ASKCBFORMATNAME = 0x030C,
            CHANGECBCHAIN = 0x030D,
            HSCROLLCLIPBOARD = 0x030E,
            QUERYNEWPALETTE = 0x030F,
            PALETTEISCHANGING = 0x0310,
            PALETTECHANGED = 0x0311,
            HOTKEY = 0x0312,
            PRINT = 0x0317,
            PRINTCLIENT = 0x0318,
            APPCOMMAND = 0x0319,
            THEMECHANGED = 0x031A,
            CLIPBOARDUPDATE = 0x031D,
            DWMCOMPOSITIONCHANGED = 0x031E,
            DWMNCRENDERINGCHANGED = 0x031F,
            DWMCOLORIZATIONCOLORCHANGED = 0x0320,
            DWMWINDOWMAXIMIZEDCHANGE = 0x0321,
            GETTITLEBARINFOEX = 0x033F,
            HANDHELDFIRST = 0x0358,
            HANDHELDLAST = 0x035F,
            AFXFIRST = 0x0360,
            AFXLAST = 0x037F,
            PENWINFIRST = 0x0380,
            PENWINLAST = 0x038F,
            APP = 0x8000,
            USER = 0x0400,
        }

        //
        // WindowFromPoint
        //
        [DllImport("user32.dll")]
        public static extern IntPtr WindowFromPoint(Point Point);

        //
        // GetAsyncKeyState
        //
        [DllImport("user32.dll")]
        public static extern short GetAsyncKeyState(int vKey);

        //
        // SetWindowsHookEx
        //
        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(
            WH hookType, HookHandler hookDelegate, IntPtr module, uint threadId);
        public static IntPtr SetWindowsHookEx(WH hookType, HookHandler hookDelegate)
        {
            IntPtr hMod = Marshal.GetHINSTANCE(
                System.Reflection.Assembly.
                GetExecutingAssembly().GetModules()[0]);
            IntPtr hook = SetWindowsHookEx(hookType, hookDelegate, hMod, 0);
            if (hook == IntPtr.Zero)
            {
                int errorCode = Marshal.GetLastWin32Error();
                throw new Win32Exception(errorCode);
            }
            return hook;
        }

        public enum WH
        {
            MIN = (-1),
            MSGFILTER = (-1),
            JOURNALRECORD = 0,
            JOURNALPLAYBACK = 1,
            KEYBOARD = 2,
            GETMESSAGE = 3,
            CALLWNDPROC = 4,
            CBT = 5,
            SYSMSGFILTER = 6,
            MOUSE = 7,
            HARDWARE = 8,
            DEBUG = 9,
            SHELL = 10,
            FOREGROUNDIDLE = 11,
            CALLWNDPROCRET = 12,
            KEYBOARD_LL = 13,
            MOUSE_LL = 14,
            MAX = 14,
            MINHOOK = MIN,
            MAXHOOK = MAX,
        }

        //
        // UnhookWindowsHookEx
        //
        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool UnhookWindowsHookEx(IntPtr hook);

        //
        // CallNextHookEx
        //
        [DllImport("user32.dll")]
        public static extern int CallNextHookEx(
            IntPtr hook, int code, WM message, IntPtr state);
        
        public const int VK_SHIFT = 0x10;
        public const int VK_CONTROL = 0x11;
        public const int VK_MENU = 0x12;

        //
        // STRUCT for Hook
        //
        [StructLayout(LayoutKind.Sequential)]
        public struct KeyboardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct MouseHookStruct
        {
            public Point pt;
            public int mouseData;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }

        //
        // DELEGATE for Hook
        //
        public delegate int HookHandler(
            int code, WM message, IntPtr state);
    }
}