WindowHooks_NativeMethods

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;

namespace WindowHooks
{
    public class WinApi
    {
        public enum WinMessage : int
        {
            WM_SETTEXT = 0X000C,
            WM_CLOSE = 0x0010,
            WM_QUIT = 0x12
        }


        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }

        public static IntPtr FindWindow(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow)
        {
            return SafeNativeMethods.FindWindowEx(hwndParent, hwndChildAfter, lpszClass, lpszWindow);
        }

        public static int SendMessage(IntPtr hwnd, WinMessage Message, int wParam, int lParam)
        {
            return SafeNativeMethods.SendMessage(hwnd, Message, wParam, lParam);
        }

        public static int SendTextMessage(IntPtr hwnd, WinMessage Message, int wParam, string lParam)
        {
            return SafeNativeMethods.SendMessage(hwnd, Message, wParam, lParam);
        }

    }

    public class Hook
    {
        public static long SWEH_CHILDID_SELF = 0;

        public enum SWEH_dwFlags : uint
        {
            WINEVENT_OUTOFCONTEXT = 0x0000,     // Events are ASYNC
            WINEVENT_SKIPOWNTHREAD = 0x0001,    // Don't call back for events on installer's thread
            WINEVENT_SKIPOWNPROCESS = 0x0002,   // Don't call back for events on installer's process
            WINEVENT_INCONTEXT = 0x0004         // Events are SYNC, this causes your dll to be injected into every process
        }

        public enum SWEH_Events : uint
        {
            EVENT_MIN = 0x00000001,
            EVENT_MAX = 0x7FFFFFFF,
            EVENT_SYSTEM_SOUND = 0x0001,
            EVENT_SYSTEM_ALERT = 0x0002,
            EVENT_SYSTEM_FOREGROUND = 0x0003,
            EVENT_SYSTEM_MENUSTART = 0x0004,
            EVENT_SYSTEM_MENUEND = 0x0005,
            EVENT_SYSTEM_MENUPOPUPSTART = 0x0006,
            EVENT_SYSTEM_MENUPOPUPEND = 0x0007,
            EVENT_SYSTEM_CAPTURESTART = 0x0008,
            EVENT_SYSTEM_CAPTUREEND = 0x0009,
            EVENT_SYSTEM_MOVESIZESTART = 0x000A,
            EVENT_SYSTEM_MOVESIZEEND = 0x000B,
            EVENT_SYSTEM_CONTEXTHELPSTART = 0x000C,
            EVENT_SYSTEM_CONTEXTHELPEND = 0x000D,
            EVENT_SYSTEM_DRAGDROPSTART = 0x000E,
            EVENT_SYSTEM_DRAGDROPEND = 0x000F,
            EVENT_SYSTEM_DIALOGSTART = 0x0010,
            EVENT_SYSTEM_DIALOGEND = 0x0011,
            EVENT_SYSTEM_SCROLLINGSTART = 0x0012,
            EVENT_SYSTEM_SCROLLINGEND = 0x0013,
            EVENT_SYSTEM_SWITCHSTART = 0x0014,
            EVENT_SYSTEM_SWITCHEND = 0x0015,
            EVENT_SYSTEM_MINIMIZESTART = 0x0016,
            EVENT_SYSTEM_MINIMIZEEND = 0x0017,
            EVENT_SYSTEM_DESKTOPSWITCH = 0x0020,
            EVENT_SYSTEM_END = 0x00FF,
            EVENT_OEM_DEFINED_START = 0x0101,
            EVENT_OEM_DEFINED_END = 0x01FF,
            EVENT_UIA_EVENTID_START = 0x4E00,
            EVENT_UIA_EVENTID_END = 0x4EFF,
            EVENT_UIA_PROPID_START = 0x7500,
            EVENT_UIA_PROPID_END = 0x75FF,
            EVENT_CONSOLE_CARET = 0x4001,
            EVENT_CONSOLE_UPDATE_REGION = 0x4002,
            EVENT_CONSOLE_UPDATE_SIMPLE = 0x4003,
            EVENT_CONSOLE_UPDATE_SCROLL = 0x4004,
            EVENT_CONSOLE_LAYOUT = 0x4005,
            EVENT_CONSOLE_START_APPLICATION = 0x4006,
            EVENT_CONSOLE_END_APPLICATION = 0x4007,
            EVENT_CONSOLE_END = 0x40FF,
            EVENT_OBJECT_CREATE = 0x8000,               // hwnd ID idChild is created item
            EVENT_OBJECT_DESTROY = 0x8001,              // hwnd ID idChild is destroyed item
            EVENT_OBJECT_SHOW = 0x8002,                 // hwnd ID idChild is shown item
            EVENT_OBJECT_HIDE = 0x8003,                 // hwnd ID idChild is hidden item
            EVENT_OBJECT_REORDER = 0x8004,              // hwnd ID idChild is parent of zordering children
            EVENT_OBJECT_FOCUS = 0x8005,                // hwnd ID idChild is focused item
            EVENT_OBJECT_SELECTION = 0x8006,            // hwnd ID idChild is selected item (if only one),
                                                        //      or idChild is OBJID_WINDOW if complex
            EVENT_OBJECT_SELECTIONADD = 0x8007,         // hwnd ID idChild is item added
            EVENT_OBJECT_SELECTIONREMOVE = 0x8008,      // hwnd ID idChild is item removed
            EVENT_OBJECT_SELECTIONWITHIN = 0x8009,      // hwnd ID idChild is parent of changed selected items
            EVENT_OBJECT_STATECHANGE = 0x800A,          // hwnd ID idChild is item w/ state change
            EVENT_OBJECT_LOCATIONCHANGE = 0x800B,       // hwnd ID idChild is moved/sized item
            EVENT_OBJECT_NAMECHANGE = 0x800C,           // hwnd ID idChild is item w/ name change
            EVENT_OBJECT_DESCRIPTIONCHANGE = 0x800D,    // hwnd ID idChild is item w/ desc change
            EVENT_OBJECT_VALUECHANGE = 0x800E,          // hwnd ID idChild is item w/ value change
            EVENT_OBJECT_PARENTCHANGE = 0x800F,         // hwnd ID idChild is item w/ new parent
            EVENT_OBJECT_HELPCHANGE = 0x8010,           // hwnd ID idChild is item w/ help change
            EVENT_OBJECT_DEFACTIONCHANGE = 0x8011,      // hwnd ID idChild is item w/ def action change
            EVENT_OBJECT_ACCELERATORCHANGE = 0x8012,    // hwnd ID idChild is item w/ keybd accel change
            EVENT_OBJECT_INVOKED = 0x8013,              // hwnd ID idChild is item invoked
            EVENT_OBJECT_TEXTSELECTIONCHANGED = 0x8014, // hwnd ID idChild is item w? test selection change
            EVENT_OBJECT_CONTENTSCROLLED = 0x8015,
            EVENT_SYSTEM_ARRANGMENTPREVIEW = 0x8016,
            EVENT_OBJECT_END = 0x80FF,
            EVENT_AIA_START = 0xA000,
            EVENT_AIA_END = 0xAFFF
        }

        public enum SWEH_ObjectId : long
        {
             OBJID_WINDOW =             0x00000000,
             OBJID_SYSMENU =            0xFFFFFFFF,
             OBJID_TITLEBAR =           0xFFFFFFFE,
             OBJID_MENU =               0xFFFFFFFD,
             OBJID_CLIENT =             0xFFFFFFFC,
             OBJID_VSCROLL =            0xFFFFFFFB,
             OBJID_HSCROLL =            0xFFFFFFFA,
             OBJID_SIZEGRIP =           0xFFFFFFF9,
             OBJID_CARET =              0xFFFFFFF8,
             OBJID_CURSOR =             0xFFFFFFF7,
             OBJID_ALERT =              0xFFFFFFF6,
             OBJID_SOUND =              0xFFFFFFF5,
             OBJID_QUERYCLASSNAMEIDX =  0xFFFFFFF4,
             OBJID_NATIVEOM =           0xFFFFFFF0
        }

        private static SWEH_dwFlags WinEventHookInternalFlags = SWEH_dwFlags.WINEVENT_OUTOFCONTEXT |
                                                                SWEH_dwFlags.WINEVENT_SKIPOWNPROCESS |
                                                                SWEH_dwFlags.WINEVENT_SKIPOWNTHREAD;

        public delegate void WinEventDelegate(IntPtr hWinEventHook,
                                              SWEH_Events eventType,
                                              IntPtr hwnd,
                                              SWEH_ObjectId idObject,
                                              long idChild,
                                              uint dwEventThread,
                                              uint dwmsEventTime);

        public static IntPtr WinEventHookRange(SWEH_Events _eventFrom,
                                               SWEH_Events _eventTo,
                                               WinEventDelegate _delegate,
                                               uint idProcess, uint idThread)
        {
            new UIPermission(UIPermissionWindow.AllWindows).Demand();
            return UnsafeNativeMethods.SetWinEventHook(_eventFrom, _eventTo,
                                                       IntPtr.Zero, _delegate,
                                                       idProcess, idThread,
                                                       WinEventHookInternalFlags);
        }

        public static IntPtr WinEventHookOne(SWEH_Events _event, WinEventDelegate _delegate, uint idProcess, uint idThread)
        {
            new UIPermission(UIPermissionWindow.AllWindows).Demand();
            return UnsafeNativeMethods.SetWinEventHook(_event, _event,
                                                       IntPtr.Zero, _delegate,
                                                       idProcess, idThread,
                                                       WinEventHookInternalFlags);
        }

        public static bool WinEventUnhook(IntPtr hWinEventHook)
        {
            return UnsafeNativeMethods.UnhookWinEvent(hWinEventHook);
        }

        public static uint GetWindowThread(IntPtr hWnd)
        {
            new UIPermission(UIPermissionWindow.AllWindows).Demand();
            return UnsafeNativeMethods.GetWindowThreadProcessId(hWnd, IntPtr.Zero);
        }


        public static WinApi.RECT GetWindowRect(IntPtr hWnd)
        {
            WinApi.RECT rect = new WinApi.RECT();
            bool _result = SafeNativeMethods.GetWindowRect(hWnd, ref rect);
            return rect;
        }

    }

    [SuppressUnmanagedCodeSecurityAttribute]
    internal static class SafeNativeMethods
    {
        [DllImport("user32.dll", EntryPoint = "FindWindowEx")]
        public static extern IntPtr FindWindowEx(IntPtr hwndParent,
                                                 IntPtr hwndChildAfter,
                                                 string lpszClass, string lpszWindow);

        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetWindowRect(IntPtr hWnd, ref WinApi.RECT lpRect);

        [DllImport("User32.dll")]
        public static extern int SendMessage(IntPtr hWnd, WinApi.WinMessage uMsg, int wParam, string lParam);

        [DllImport("User32.dll")]
        public static extern int SendMessage(IntPtr hWnd, WinApi.WinMessage uMsg, int wParam, int lParam);

    }


    [SuppressUnmanagedCodeSecurityAttribute]
    internal static class UnsafeNativeMethods
    {
        [DllImport("user32.dll", SetLastError = true)]
        public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

        [DllImport("user32.dll")]
        public static extern uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr voidProcessId);

        [DllImport("user32.dll", SetLastError = false)]
        public static extern IntPtr SetWinEventHook(Hook.SWEH_Events eventMin, Hook.SWEH_Events eventMax,
                                                    IntPtr hmodWinEventProc, Hook.WinEventDelegate lpfnWinEventProc,
                                                    uint idProcess, uint idThread, Hook.SWEH_dwFlags dwFlags);

        [DllImport("user32.dll", SetLastError = false)]
        public static extern bool UnhookWinEvent(IntPtr hWinEventHook);
    }
}