Avalonia/src/Windows/Avalonia.Win32/Interop/UnmanagedMethods.cs

// Copyright (c) The Avalonia Project. All rights reserved.
// Licensed under the MIT license. See licence.md file in the project root for full license information.

using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;
using System.Text;

// ReSharper disable InconsistentNaming
#pragma warning disable 169, 649

namespace Avalonia.Win32.Interop
{
    [SuppressMessage("Microsoft.StyleCop.CSharp.NamingRules", "SA1305:FieldNamesMustNotUseHungarianNotation", Justification = "Using Win32 naming for consistency.")]
    [SuppressMessage("Microsoft.StyleCop.CSharp.NamingRules", "SA1307:AccessibleFieldsMustBeginWithUpperCaseLetter", Justification = "Using Win32 naming for consistency.")]
    [SuppressMessage("Microsoft.StyleCop.CSharp.NamingRules", "SA1310:FieldNamesMustNotContainUnderscore", Justification = "Using Win32 naming for consistency.")]
    [SuppressMessage("StyleCop.CSharp.DocumentationRules", "SA1600:Elements must be documented", Justification = "Look in Win32 docs.")]
    [SuppressMessage("StyleCop.CSharp.DocumentationRules", "SA1602:Enumeration items must be documented", Justification = "Look in Win32 docs.")]
    internal static class UnmanagedMethods
    {
        public const int CW_USEDEFAULT = unchecked((int)0x80000000);

        public delegate void TimerProc(IntPtr hWnd, uint uMsg, IntPtr nIDEvent, uint dwTime);

        public delegate void TimeCallback(uint uTimerID, uint uMsg, UIntPtr dwUser, UIntPtr dw1, UIntPtr dw2);

        public delegate IntPtr WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

        public enum Cursor
        {
            IDC_ARROW = 32512,
            IDC_IBEAM = 32513,
            IDC_WAIT = 32514,
            IDC_CROSS = 32515,
            IDC_UPARROW = 32516,
            IDC_SIZE = 32640,
            IDC_ICON = 32641,
            IDC_SIZENWSE = 32642,
            IDC_SIZENESW = 32643,
            IDC_SIZEWE = 32644,
            IDC_SIZENS = 32645,
            IDC_SIZEALL = 32646,
            IDC_NO = 32648,
            IDC_HAND = 32649,
            IDC_APPSTARTING = 32650,
            IDC_HELP = 32651
        }

        public enum MouseActivate : int
        {
            MA_ACTIVATE = 1,
            MA_ACTIVATEANDEAT = 2,
            MA_NOACTIVATE = 3,
            MA_NOACTIVATEANDEAT = 4
        }

        [Flags]
        public enum SetWindowPosFlags : uint
        {
            SWP_ASYNCWINDOWPOS = 0x4000,
            SWP_DEFERERASE = 0x2000,
            SWP_DRAWFRAME = 0x0020,
            SWP_FRAMECHANGED = 0x0020,
            SWP_HIDEWINDOW = 0x0080,
            SWP_NOACTIVATE = 0x0010,
            SWP_NOCOPYBITS = 0x0100,
            SWP_NOMOVE = 0x0002,
            SWP_NOOWNERZORDER = 0x0200,
            SWP_NOREDRAW = 0x0008,
            SWP_NOREPOSITION = 0x0200,
            SWP_NOSENDCHANGING = 0x0400,
            SWP_NOSIZE = 0x0001,
            SWP_NOZORDER = 0x0004,
            SWP_SHOWWINDOW = 0x0040,

            SWP_RESIZE = SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOZORDER
        }

        public enum SizeCommand
        {
            Restored,
            Minimized,
            Maximized,
            MaxShow,
            MaxHide,
        }

        public enum ShowWindowCommand
        {
            Hide = 0,
            Normal = 1,
            ShowMinimized = 2,
            Maximize = 3,
            ShowMaximized = 3,
            ShowNoActivate = 4,
            Show = 5,
            Minimize = 6,
            ShowMinNoActive = 7,
            ShowNA = 8,
            Restore = 9,
            ShowDefault = 10,
            ForceMinimize = 11
        }

        public enum SystemMetric
        {
            SM_CXSCREEN = 0,  // 0x00
            SM_CYSCREEN = 1,  // 0x01
            SM_CXVSCROLL = 2,  // 0x02
            SM_CYHSCROLL = 3,  // 0x03
            SM_CYCAPTION = 4,  // 0x04
            SM_CXBORDER = 5,  // 0x05
            SM_CYBORDER = 6,  // 0x06
            SM_CXDLGFRAME = 7,  // 0x07
            SM_CXFIXEDFRAME = 7,  // 0x07
            SM_CYDLGFRAME = 8,  // 0x08
            SM_CYFIXEDFRAME = 8,  // 0x08
            SM_CYVTHUMB = 9,  // 0x09
            SM_CXHTHUMB = 10, // 0x0A
            SM_CXICON = 11, // 0x0B
            SM_CYICON = 12, // 0x0C
            SM_CXCURSOR = 13, // 0x0D
            SM_CYCURSOR = 14, // 0x0E
            SM_CYMENU = 15, // 0x0F
            SM_CXFULLSCREEN = 16, // 0x10
            SM_CYFULLSCREEN = 17, // 0x11
            SM_CYKANJIWINDOW = 18, // 0x12
            SM_MOUSEPRESENT = 19, // 0x13
            SM_CYVSCROLL = 20, // 0x14
            SM_CXHSCROLL = 21, // 0x15
            SM_DEBUG = 22, // 0x16
            SM_SWAPBUTTON = 23, // 0x17
            SM_CXMIN = 28, // 0x1C
            SM_CYMIN = 29, // 0x1D
            SM_CXSIZE = 30, // 0x1E
            SM_CYSIZE = 31, // 0x1F
            SM_CXSIZEFRAME = 32, // 0x20
            SM_CXFRAME = 32, // 0x20
            SM_CYSIZEFRAME = 33, // 0x21
            SM_CYFRAME = 33, // 0x21
            SM_CXMINTRACK = 34, // 0x22
            SM_CYMINTRACK = 35, // 0x23
            SM_CXDOUBLECLK = 36, // 0x24
            SM_CYDOUBLECLK = 37, // 0x25
            SM_CXICONSPACING = 38, // 0x26
            SM_CYICONSPACING = 39, // 0x27
            SM_MENUDROPALIGNMENT = 40, // 0x28
            SM_PENWINDOWS = 41, // 0x29
            SM_DBCSENABLED = 42, // 0x2A
            SM_CMOUSEBUTTONS = 43, // 0x2B
            SM_SECURE = 44, // 0x2C
            SM_CXEDGE = 45, // 0x2D
            SM_CYEDGE = 46, // 0x2E
            SM_CXMINSPACING = 47, // 0x2F
            SM_CYMINSPACING = 48, // 0x30
            SM_CXSMICON = 49, // 0x31
            SM_CYSMICON = 50, // 0x32
            SM_CYSMCAPTION = 51, // 0x33
            SM_CXSMSIZE = 52, // 0x34
            SM_CYSMSIZE = 53, // 0x35
            SM_CXMENUSIZE = 54, // 0x36
            SM_CYMENUSIZE = 55, // 0x37
            SM_ARRANGE = 56, // 0x38
            SM_CXMINIMIZED = 57, // 0x39
            SM_CYMINIMIZED = 58, // 0x3A
            SM_CXMAXTRACK = 59, // 0x3B
            SM_CYMAXTRACK = 60, // 0x3C
            SM_CXMAXIMIZED = 61, // 0x3D
            SM_CYMAXIMIZED = 62, // 0x3E
            SM_NETWORK = 63, // 0x3F
            SM_CLEANBOOT = 67, // 0x43
            SM_CXDRAG = 68, // 0x44
            SM_CYDRAG = 69, // 0x45
            SM_SHOWSOUNDS = 70, // 0x46
            SM_CXMENUCHECK = 71, // 0x47
            SM_CYMENUCHECK = 72, // 0x48
            SM_SLOWMACHINE = 73, // 0x49
            SM_MIDEASTENABLED = 74, // 0x4A
            SM_MOUSEWHEELPRESENT = 75, // 0x4B
            SM_XVIRTUALSCREEN = 76, // 0x4C
            SM_YVIRTUALSCREEN = 77, // 0x4D
            SM_CXVIRTUALSCREEN = 78, // 0x4E
            SM_CYVIRTUALSCREEN = 79, // 0x4F
            SM_CMONITORS = 80, // 0x50
            SM_SAMEDISPLAYFORMAT = 81, // 0x51
            SM_IMMENABLED = 82, // 0x52
            SM_CXFOCUSBORDER = 83, // 0x53
            SM_CYFOCUSBORDER = 84, // 0x54
            SM_TABLETPC = 86, // 0x56
            SM_MEDIACENTER = 87, // 0x57
            SM_STARTER = 88, // 0x58
            SM_SERVERR2 = 89, // 0x59
            SM_MOUSEHORIZONTALWHEELPRESENT = 91, // 0x5B
            SM_CXPADDEDBORDER = 92, // 0x5C
            SM_DIGITIZER = 94, // 0x5E
            SM_MAXIMUMTOUCHES = 95, // 0x5F

            SM_REMOTESESSION = 0x1000, // 0x1000
            SM_SHUTTINGDOWN = 0x2000, // 0x2000
            SM_REMOTECONTROL = 0x2001, // 0x2001

            SM_CONVERTABLESLATEMODE = 0x2003,
            SM_SYSTEMDOCKED = 0x2004,
        }

        [Flags]
        public enum ModifierKeys
        {
            MK_CONTROL = 0x0008,

            MK_LBUTTON = 0x0001,

            MK_MBUTTON = 0x0010,

            MK_RBUTTON = 0x0002,

            MK_SHIFT = 0x0004,

            MK_XBUTTON1 = 0x0020,

            MK_XBUTTON2 = 0x0040
        }

        public enum WindowActivate
        {
            WA_INACTIVE,
            WA_ACTIVE,
            WA_CLICKACTIVE,
        }

        public enum HitTestValues
        {
            HTERROR = -2,
            HTTRANSPARENT = -1,
            HTNOWHERE = 0,
            HTCLIENT = 1,
            HTCAPTION = 2,
            HTSYSMENU = 3,
            HTGROWBOX = 4,
            HTMENU = 5,
            HTHSCROLL = 6,
            HTVSCROLL = 7,
            HTMINBUTTON = 8,
            HTMAXBUTTON = 9,
            HTLEFT = 10,
            HTRIGHT = 11,
            HTTOP = 12,
            HTTOPLEFT = 13,
            HTTOPRIGHT = 14,
            HTBOTTOM = 15,
            HTBOTTOMLEFT = 16,
            HTBOTTOMRIGHT = 17,
            HTBORDER = 18,
            HTOBJECT = 19,
            HTCLOSE = 20,
            HTHELP = 21
        }

        [Flags]
        public enum WindowStyles : uint
        {
            WS_BORDER = 0x800000,
            WS_CAPTION = 0xc00000,
            WS_CHILD = 0x40000000,
            WS_CLIPCHILDREN = 0x2000000,
            WS_CLIPSIBLINGS = 0x4000000,
            WS_DISABLED = 0x8000000,
            WS_DLGFRAME = 0x400000,
            WS_GROUP = 0x20000,
            WS_HSCROLL = 0x100000,
            WS_MAXIMIZE = 0x1000000,
            WS_MAXIMIZEBOX = 0x10000,
            WS_MINIMIZE = 0x20000000,
            WS_MINIMIZEBOX = 0x20000,
            WS_OVERLAPPED = 0x0,
            WS_OVERLAPPEDWINDOW = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_SIZEFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,
            WS_POPUP = 0x80000000u,
            WS_POPUPWINDOW = WS_POPUP | WS_BORDER | WS_SYSMENU,
            WS_SIZEFRAME = 0x40000,
            WS_SYSMENU = 0x80000,
            WS_TABSTOP = 0x10000,
            WS_VISIBLE = 0x10000000,
            WS_VSCROLL = 0x200000,
            WS_EX_DLGMODALFRAME = 0x00000001,
            WS_EX_NOPARENTNOTIFY = 0x00000004,
            WS_EX_TOPMOST = 0x00000008,
            WS_EX_ACCEPTFILES = 0x00000010,
            WS_EX_TRANSPARENT = 0x00000020,
            WS_EX_MDICHILD = 0x00000040,
            WS_EX_TOOLWINDOW = 0x00000080,
            WS_EX_WINDOWEDGE = 0x00000100,
            WS_EX_CLIENTEDGE = 0x00000200,
            WS_EX_CONTEXTHELP = 0x00000400,
            WS_EX_RIGHT = 0x00001000,
            WS_EX_LEFT = 0x00000000,
            WS_EX_RTLREADING = 0x00002000,
            WS_EX_LTRREADING = 0x00000000,
            WS_EX_LEFTSCROLLBAR = 0x00004000,
            WS_EX_RIGHTSCROLLBAR = 0x00000000,
            WS_EX_CONTROLPARENT = 0x00010000,
            WS_EX_STATICEDGE = 0x00020000,
            WS_EX_APPWINDOW = 0x00040000,
            WS_EX_OVERLAPPEDWINDOW = WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE,
            WS_EX_PALETTEWINDOW = WS_EX_WINDOWEDGE | WS_EX_TOOLWINDOW | WS_EX_TOPMOST,
            WS_EX_LAYERED = 0x00080000,
            WS_EX_NOINHERITLAYOUT = 0x00100000,
            WS_EX_LAYOUTRTL = 0x00400000,
            WS_EX_COMPOSITED = 0x02000000,
            WS_EX_NOACTIVATE = 0x08000000
        }

        public enum WindowsMessage : uint
        {
            WM_NULL = 0x0000,
            WM_CREATE = 0x0001,
            WM_DESTROY = 0x0002,
            WM_MOVE = 0x0003,
            WM_SIZE = 0x0005,
            WM_ACTIVATE = 0x0006,
            WM_SETFOCUS = 0x0007,
            WM_KILLFOCUS = 0x0008,
            WM_ENABLE = 0x000A,
            WM_SETREDRAW = 0x000B,
            WM_SETTEXT = 0x000C,
            WM_GETTEXT = 0x000D,
            WM_GETTEXTLENGTH = 0x000E,
            WM_PAINT = 0x000F,
            WM_CLOSE = 0x0010,
            WM_QUERYENDSESSION = 0x0011,
            WM_QUERYOPEN = 0x0013,
            WM_ENDSESSION = 0x0016,
            WM_QUIT = 0x0012,
            WM_ERASEBKGND = 0x0014,
            WM_SYSCOLORCHANGE = 0x0015,
            WM_SHOWWINDOW = 0x0018,
            WM_WININICHANGE = 0x001A,
            WM_SETTINGCHANGE = WM_WININICHANGE,
            WM_DEVMODECHANGE = 0x001B,
            WM_ACTIVATEAPP = 0x001C,
            WM_FONTCHANGE = 0x001D,
            WM_TIMECHANGE = 0x001E,
            WM_CANCELMODE = 0x001F,
            WM_SETCURSOR = 0x0020,
            WM_MOUSEACTIVATE = 0x0021,
            WM_CHILDACTIVATE = 0x0022,
            WM_QUEUESYNC = 0x0023,
            WM_GETMINMAXINFO = 0x0024,
            WM_PAINTICON = 0x0026,
            WM_ICONERASEBKGND = 0x0027,
            WM_NEXTDLGCTL = 0x0028,
            WM_SPOOLERSTATUS = 0x002A,
            WM_DRAWITEM = 0x002B,
            WM_MEASUREITEM = 0x002C,
            WM_DELETEITEM = 0x002D,
            WM_VKEYTOITEM = 0x002E,
            WM_CHARTOITEM = 0x002F,
            WM_SETFONT = 0x0030,
            WM_GETFONT = 0x0031,
            WM_SETHOTKEY = 0x0032,
            WM_GETHOTKEY = 0x0033,
            WM_QUERYDRAGICON = 0x0037,
            WM_COMPAREITEM = 0x0039,
            WM_GETOBJECT = 0x003D,
            WM_COMPACTING = 0x0041,
            WM_WINDOWPOSCHANGING = 0x0046,
            WM_WINDOWPOSCHANGED = 0x0047,
            WM_COPYDATA = 0x004A,
            WM_CANCELJOURNAL = 0x004B,
            WM_NOTIFY = 0x004E,
            WM_INPUTLANGCHANGEREQUEST = 0x0050,
            WM_INPUTLANGCHANGE = 0x0051,
            WM_TCARD = 0x0052,
            WM_HELP = 0x0053,
            WM_USERCHANGED = 0x0054,
            WM_NOTIFYFORMAT = 0x0055,
            WM_CONTEXTMENU = 0x007B,
            WM_STYLECHANGING = 0x007C,
            WM_STYLECHANGED = 0x007D,
            WM_DISPLAYCHANGE = 0x007E,
            WM_GETICON = 0x007F,
            WM_SETICON = 0x0080,
            WM_NCCREATE = 0x0081,
            WM_NCDESTROY = 0x0082,
            WM_NCCALCSIZE = 0x0083,
            WM_NCHITTEST = 0x0084,
            WM_NCPAINT = 0x0085,
            WM_NCACTIVATE = 0x0086,
            WM_GETDLGCODE = 0x0087,
            WM_SYNCPAINT = 0x0088,
            WM_NCMOUSEMOVE = 0x00A0,
            WM_NCLBUTTONDOWN = 0x00A1,
            WM_NCLBUTTONUP = 0x00A2,
            WM_NCLBUTTONDBLCLK = 0x00A3,
            WM_NCRBUTTONDOWN = 0x00A4,
            WM_NCRBUTTONUP = 0x00A5,
            WM_NCRBUTTONDBLCLK = 0x00A6,
            WM_NCMBUTTONDOWN = 0x00A7,
            WM_NCMBUTTONUP = 0x00A8,
            WM_NCMBUTTONDBLCLK = 0x00A9,
            WM_NCXBUTTONDOWN = 0x00AB,
            WM_NCXBUTTONUP = 0x00AC,
            WM_NCXBUTTONDBLCLK = 0x00AD,
            WM_INPUT_DEVICE_CHANGE = 0x00FE,
            WM_INPUT = 0x00FF,
            WM_KEYFIRST = 0x0100,
            WM_KEYDOWN = 0x0100,
            WM_KEYUP = 0x0101,
            WM_CHAR = 0x0102,
            WM_DEADCHAR = 0x0103,
            WM_SYSKEYDOWN = 0x0104,
            WM_SYSKEYUP = 0x0105,
            WM_SYSCHAR = 0x0106,
            WM_SYSDEADCHAR = 0x0107,
            WM_UNICHAR = 0x0109,
            WM_KEYLAST = 0x0109,
            WM_IME_STARTCOMPOSITION = 0x010D,
            WM_IME_ENDCOMPOSITION = 0x010E,
            WM_IME_COMPOSITION = 0x010F,
            WM_IME_KEYLAST = 0x010F,
            WM_INITDIALOG = 0x0110,
            WM_COMMAND = 0x0111,
            WM_SYSCOMMAND = 0x0112,
            WM_TIMER = 0x0113,
            WM_HSCROLL = 0x0114,
            WM_VSCROLL = 0x0115,
            WM_INITMENU = 0x0116,
            WM_INITMENUPOPUP = 0x0117,
            WM_MENUSELECT = 0x011F,
            WM_MENUCHAR = 0x0120,
            WM_ENTERIDLE = 0x0121,
            WM_MENURBUTTONUP = 0x0122,
            WM_MENUDRAG = 0x0123,
            WM_MENUGETOBJECT = 0x0124,
            WM_UNINITMENUPOPUP = 0x0125,
            WM_MENUCOMMAND = 0x0126,
            WM_CHANGEUISTATE = 0x0127,
            WM_UPDATEUISTATE = 0x0128,
            WM_QUERYUISTATE = 0x0129,
            WM_CTLCOLORMSGBOX = 0x0132,
            WM_CTLCOLOREDIT = 0x0133,
            WM_CTLCOLORLISTBOX = 0x0134,
            WM_CTLCOLORBTN = 0x0135,
            WM_CTLCOLORDLG = 0x0136,
            WM_CTLCOLORSCROLLBAR = 0x0137,
            WM_CTLCOLORSTATIC = 0x0138,
            WM_MOUSEFIRST = 0x0200,
            WM_MOUSEMOVE = 0x0200,
            WM_LBUTTONDOWN = 0x0201,
            WM_LBUTTONUP = 0x0202,
            WM_LBUTTONDBLCLK = 0x0203,
            WM_RBUTTONDOWN = 0x0204,
            WM_RBUTTONUP = 0x0205,
            WM_RBUTTONDBLCLK = 0x0206,
            WM_MBUTTONDOWN = 0x0207,
            WM_MBUTTONUP = 0x0208,
            WM_MBUTTONDBLCLK = 0x0209,
            WM_MOUSEWHEEL = 0x020A,
            WM_XBUTTONDOWN = 0x020B,
            WM_XBUTTONUP = 0x020C,
            WM_XBUTTONDBLCLK = 0x020D,
            WM_MOUSEHWHEEL = 0x020E,
            WM_MOUSELAST = 0x020E,
            WM_PARENTNOTIFY = 0x0210,
            WM_ENTERMENULOOP = 0x0211,
            WM_EXITMENULOOP = 0x0212,
            WM_NEXTMENU = 0x0213,
            WM_SIZING = 0x0214,
            WM_CAPTURECHANGED = 0x0215,
            WM_MOVING = 0x0216,
            WM_POWERBROADCAST = 0x0218,
            WM_DEVICECHANGE = 0x0219,
            WM_MDICREATE = 0x0220,
            WM_MDIDESTROY = 0x0221,
            WM_MDIACTIVATE = 0x0222,
            WM_MDIRESTORE = 0x0223,
            WM_MDINEXT = 0x0224,
            WM_MDIMAXIMIZE = 0x0225,
            WM_MDITILE = 0x0226,
            WM_MDICASCADE = 0x0227,
            WM_MDIICONARRANGE = 0x0228,
            WM_MDIGETACTIVE = 0x0229,
            WM_MDISETMENU = 0x0230,
            WM_ENTERSIZEMOVE = 0x0231,
            WM_EXITSIZEMOVE = 0x0232,
            WM_DROPFILES = 0x0233,
            WM_MDIREFRESHMENU = 0x0234,
            WM_IME_SETCONTEXT = 0x0281,
            WM_IME_NOTIFY = 0x0282,
            WM_IME_CONTROL = 0x0283,
            WM_IME_COMPOSITIONFULL = 0x0284,
            WM_IME_SELECT = 0x0285,
            WM_IME_CHAR = 0x0286,
            WM_IME_REQUEST = 0x0288,
            WM_IME_KEYDOWN = 0x0290,
            WM_IME_KEYUP = 0x0291,
            WM_MOUSEHOVER = 0x02A1,
            WM_MOUSELEAVE = 0x02A3,
            WM_NCMOUSEHOVER = 0x02A0,
            WM_NCMOUSELEAVE = 0x02A2,
            WM_WTSSESSION_CHANGE = 0x02B1,
            WM_TABLET_FIRST = 0x02c0,
            WM_TABLET_LAST = 0x02df,
            WM_DPICHANGED = 0x02E0,
            WM_CUT = 0x0300,
            WM_COPY = 0x0301,
            WM_PASTE = 0x0302,
            WM_CLEAR = 0x0303,
            WM_UNDO = 0x0304,
            WM_RENDERFORMAT = 0x0305,
            WM_RENDERALLFORMATS = 0x0306,
            WM_DESTROYCLIPBOARD = 0x0307,
            WM_DRAWCLIPBOARD = 0x0308,
            WM_PAINTCLIPBOARD = 0x0309,
            WM_VSCROLLCLIPBOARD = 0x030A,
            WM_SIZECLIPBOARD = 0x030B,
            WM_ASKCBFORMATNAME = 0x030C,
            WM_CHANGECBCHAIN = 0x030D,
            WM_HSCROLLCLIPBOARD = 0x030E,
            WM_QUERYNEWPALETTE = 0x030F,
            WM_PALETTEISCHANGING = 0x0310,
            WM_PALETTECHANGED = 0x0311,
            WM_HOTKEY = 0x0312,
            WM_PRINT = 0x0317,
            WM_PRINTCLIENT = 0x0318,
            WM_APPCOMMAND = 0x0319,
            WM_THEMECHANGED = 0x031A,
            WM_CLIPBOARDUPDATE = 0x031D,
            WM_DWMCOMPOSITIONCHANGED = 0x031E,
            WM_DWMNCRENDERINGCHANGED = 0x031F,
            WM_DWMCOLORIZATIONCOLORCHANGED = 0x0320,
            WM_DWMWINDOWMAXIMIZEDCHANGE = 0x0321,
            WM_GETTITLEBARINFOEX = 0x033F,
            WM_HANDHELDFIRST = 0x0358,
            WM_HANDHELDLAST = 0x035F,
            WM_AFXFIRST = 0x0360,
            WM_AFXLAST = 0x037F,
            WM_PENWINFIRST = 0x0380,
            WM_PENWINLAST = 0x038F,
            WM_APP = 0x8000,
            WM_USER = 0x0400,

            WM_DISPATCH_WORK_ITEM = WM_USER,
        }

        public enum BitmapCompressionMode : uint
        {
            BI_RGB = 0,
            BI_RLE8 = 1,
            BI_RLE4 = 2,
            BI_BITFIELDS = 3,
            BI_JPEG = 4,
            BI_PNG = 5
        }

        public enum DIBColorTable
        {
            DIB_RGB_COLORS = 0,     /* color table in RGBs */
            DIB_PAL_COLORS          /* color table in palette indices */
        };

        [StructLayout(LayoutKind.Sequential)]
        public struct RGBQUAD
        {
            public byte rgbBlue;
            public byte rgbGreen;
            public byte rgbRed;
            public byte rgbReserved;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct BITMAPINFOHEADER
        {
            public uint biSize;
            public int biWidth;
            public int biHeight;
            public ushort biPlanes;
            public ushort biBitCount;
            public uint biCompression;
            public uint biSizeImage;
            public int biXPelsPerMeter;
            public int biYPelsPerMeter;
            public uint biClrUsed;
            public uint biClrImportant;

            public void Init()
            {
                biSize = (uint)Marshal.SizeOf(this);
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct BITMAPINFO
        {
            // C# cannot inlay structs in structs so must expand directly here
            //
            //[StructLayout(LayoutKind.Sequential)]
            //public struct BITMAPINFOHEADER
            //{
            public uint biSize;
            public int biWidth;
            public int biHeight;
            public ushort biPlanes;
            public ushort biBitCount;
            public BitmapCompressionMode biCompression;
            public uint biSizeImage;
            public int biXPelsPerMeter;
            public int biYPelsPerMeter;
            public uint biClrUsed;
            public uint biClrImportant;
            //}

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
            public uint[] cols;
        }

        public const int SizeOf_BITMAPINFOHEADER = 40;

        [DllImport("user32.dll")]
        public static extern bool EnumDisplayMonitors(IntPtr hdc, IntPtr lprcClip,
                                                      MonitorEnumDelegate lpfnEnum, IntPtr dwData);
        
        public delegate bool MonitorEnumDelegate(IntPtr hMonitor, IntPtr hdcMonitor, ref Rect lprcMonitor, IntPtr dwData);
        
        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr GetDC(IntPtr hWnd);

        [DllImport("gdi32.dll")]
        public static extern int SetDIBitsToDevice(IntPtr hdc, int XDest, int YDest,
            uint dwWidth, uint dwHeight,
            int XSrc, int YSrc,
            uint uStartScan, uint cScanLines,
           IntPtr lpvBits, [In] ref BITMAPINFO lpbmi, uint fuColorUse);

        [DllImport("user32.dll")]
        public static extern bool ReleaseDC(IntPtr hWnd, IntPtr hDC);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool AdjustWindowRectEx(ref RECT lpRect, uint dwStyle, bool bMenu, uint dwExStyle);

        [DllImport("user32.dll")]
        public static extern IntPtr BeginPaint(IntPtr hwnd, out PAINTSTRUCT lpPaint);

        [DllImport("user32.dll")]
        public static extern bool ClientToScreen(IntPtr hWnd, ref POINT lpPoint);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr CreateWindowEx(
           int dwExStyle,
           uint lpClassName,
           string lpWindowName,
           uint dwStyle,
           int x,
           int y,
           int nWidth,
           int nHeight,
           IntPtr hWndParent,
           IntPtr hMenu,
           IntPtr hInstance,
           IntPtr lpParam);

        [DllImport("user32.dll", EntryPoint = "DefWindowProcW")]
        public static extern IntPtr DefWindowProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll", EntryPoint = "DispatchMessageW")]
        public static extern IntPtr DispatchMessage(ref MSG lpmsg);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool DestroyWindow(IntPtr hwnd);

        [DllImport("user32.dll")]
        public static extern bool EnableWindow(IntPtr hWnd, bool bEnable);

        [DllImport("user32.dll")]
        public static extern bool EndPaint(IntPtr hWnd, ref PAINTSTRUCT lpPaint);

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

        [DllImport("user32.dll")]
        public static extern bool GetClientRect(IntPtr hwnd, out RECT lpRect);

        [DllImport("user32.dll")]
        public static extern bool GetCursorPos(out POINT lpPoint);

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

        [DllImport("user32.dll")]
        public static extern bool GetKeyboardState(byte[] lpKeyState);

        [DllImport("user32.dll", EntryPoint = "GetMessageW")]
        public static extern sbyte GetMessage(out MSG lpMsg, IntPtr hWnd, uint wMsgFilterMin, uint wMsgFilterMax);

        [DllImport("user32.dll")]
        public static extern int GetMessageTime();

        [DllImport("kernel32.dll")]
        public static extern IntPtr GetModuleHandle(string lpModuleName);

        [DllImport("kernel32.dll")]
        public static extern uint GetCurrentThreadId();

        [DllImport("user32.dll")]
        public static extern int GetSystemMetrics(SystemMetric smIndex);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern uint GetWindowLongPtr(IntPtr hWnd, int nIndex);

        [DllImport("user32.dll", SetLastError = true, EntryPoint = "GetWindowLong")]
        public static extern uint GetWindowLong32b(IntPtr hWnd, int nIndex);

        public static uint GetWindowLong(IntPtr hWnd, int nIndex)
        {
            if(IntPtr.Size == 4)
            {
                return GetWindowLong32b(hWnd, nIndex);
            }
            else
            {
                return GetWindowLongPtr(hWnd, nIndex);
            }
        }

        [DllImport("user32.dll", SetLastError = true, EntryPoint = "SetWindowLong")]
        private static extern uint SetWindowLong32b(IntPtr hWnd, int nIndex, uint value);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern uint SetWindowLongPtr(IntPtr hWnd, int nIndex, uint value);

        public static uint SetWindowLong(IntPtr hWnd, int nIndex, uint value)
        {
            if (IntPtr.Size == 4)
            {
                return SetWindowLong32b(hWnd, nIndex, value);
            }
            else
            {
                return SetWindowLongPtr(hWnd, nIndex, value);
            }
        }

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);

        [DllImport("user32.dll")]
        public static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect);

        [DllImport("user32.dll")]
        public static extern bool GetUpdateRect(IntPtr hwnd, out RECT lpRect, bool bErase);

        [DllImport("user32.dll")]
        public static extern bool InvalidateRect(IntPtr hWnd, ref RECT lpRect, bool bErase);

        [DllImport("user32.dll")]
        public static extern bool IsWindowEnabled(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern bool IsWindowUnicode(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern bool IsWindowVisible(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern bool KillTimer(IntPtr hWnd, IntPtr uIDEvent);

        [DllImport("user32.dll")]
        public static extern IntPtr LoadCursor(IntPtr hInstance, IntPtr lpCursorName);

        [DllImport("user32.dll")]
        public static extern bool PeekMessage(out MSG lpMsg, IntPtr hWnd, uint wMsgFilterMin, uint wMsgFilterMax, uint wRemoveMsg);
        
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode, EntryPoint = "RegisterClassExW")]
        public static extern ushort RegisterClassEx(ref WNDCLASSEX lpwcx);

        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();

        [DllImport("user32.dll")]
        public static extern bool ScreenToClient(IntPtr hWnd, ref POINT lpPoint);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr SetActiveWindow(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern IntPtr SetCapture(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern IntPtr SetTimer(IntPtr hWnd, IntPtr nIDEvent, uint uElapse, TimerProc lpTimerFunc);
        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);
        [DllImport("user32.dll")]
        public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, SetWindowPosFlags uFlags);
        [DllImport("user32.dll")]
        public static extern bool SetFocus(IntPtr hWnd);
        [DllImport("user32.dll")]
        public static extern bool SetParent(IntPtr hWnd, IntPtr hWndNewParent);
        [DllImport("user32.dll")]
        public static extern bool ShowWindow(IntPtr hWnd, ShowWindowCommand nCmdShow);

        [DllImport("Winmm.dll")]
        public static extern uint timeKillEvent(uint uTimerID);

        [DllImport("Winmm.dll")]
        public static extern uint timeSetEvent(uint uDelay, uint uResolution, TimeCallback lpTimeProc, UIntPtr dwUser, uint fuEvent);

        [DllImport("user32.dll")]
        public static extern int ToUnicode(
            uint virtualKeyCode,
            uint scanCode,
            byte[] keyboardState,
            [Out, MarshalAs(UnmanagedType.LPWStr, SizeConst = 64)]
            StringBuilder receivingBuffer,
            int bufferSize,
            uint flags);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool TrackMouseEvent(ref TRACKMOUSEEVENT lpEventTrack);

        [DllImport("user32.dll")]
        public static extern bool TranslateMessage(ref MSG lpMsg);

        [DllImport("user32.dll")]
        public static extern bool UnregisterClass(string lpClassName, IntPtr hInstance);

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode, EntryPoint = "SetWindowTextW")]
        public static extern bool SetWindowText(IntPtr hwnd, string lpString);

        public enum ClassLongIndex : int
        {
            GCL_HCURSOR = -12,
            GCL_HICON = -14
        }

        [DllImport("user32.dll", EntryPoint = "SetClassLongPtr")]
        private static extern IntPtr SetClassLong64(IntPtr hWnd, ClassLongIndex nIndex, IntPtr dwNewLong);

        [DllImport("user32.dll", EntryPoint = "SetClassLong")]
        private static extern IntPtr SetClassLong32(IntPtr hWnd, ClassLongIndex nIndex, IntPtr dwNewLong);

        public static IntPtr SetClassLong(IntPtr hWnd, ClassLongIndex nIndex, IntPtr dwNewLong)
        {
            if (IntPtr.Size == 4)
            {
                return SetClassLong32(hWnd, nIndex, dwNewLong);
            }

            return SetClassLong64(hWnd, nIndex, dwNewLong);
        }

        [DllImport("ole32.dll", PreserveSig = true)]
        internal static extern int CoCreateInstance(ref Guid clsid,
            IntPtr ignore1, int ignore2, ref Guid iid, [MarshalAs(UnmanagedType.IUnknown), Out] out object pUnkOuter);

        
        [DllImport("shell32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        internal static extern int SHCreateItemFromParsingName([MarshalAs(UnmanagedType.LPWStr)] string pszPath, IntPtr pbc, ref Guid riid, [MarshalAs(UnmanagedType.Interface)] out IShellItem ppv);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool OpenClipboard(IntPtr hWndOwner);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool CloseClipboard();

        [DllImport("user32.dll")]
        public static extern bool EmptyClipboard();

        [DllImport("user32.dll")]
        public static extern IntPtr GetClipboardData(ClipboardFormat uFormat);

        [DllImport("user32.dll")]
        public static extern IntPtr SetClipboardData(ClipboardFormat uFormat, IntPtr hMem);

        [DllImport("kernel32.dll", ExactSpelling = true)]
        public static extern IntPtr GlobalLock(IntPtr handle);

        [DllImport("kernel32.dll", ExactSpelling = true)]
        public static extern bool GlobalUnlock(IntPtr handle);

        [DllImport("kernel32.dll", ExactSpelling = true)]
        public static extern IntPtr GlobalAlloc(int uFlags, int dwBytes);

        [DllImport("kernel32.dll", ExactSpelling = true)]
        public static extern IntPtr GlobalFree(IntPtr hMem);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern IntPtr LoadLibrary(string fileName);

        [DllImport("comdlg32.dll", CharSet = CharSet.Unicode, EntryPoint = "GetSaveFileNameW")]
        public static extern bool GetSaveFileName(IntPtr lpofn);

        [DllImport("comdlg32.dll", CharSet = CharSet.Unicode, EntryPoint = "GetOpenFileNameW")]
        public static extern bool GetOpenFileName(IntPtr lpofn);

        [DllImport("comdlg32.dll")]
        public static extern int CommDlgExtendedError();

        public static bool ShCoreAvailable => LoadLibrary("shcore.dll") != IntPtr.Zero;

        [DllImport("shcore.dll")]
        public static extern void SetProcessDpiAwareness(PROCESS_DPI_AWARENESS value);

        [DllImport("shcore.dll")]
        public static extern long GetDpiForMonitor(IntPtr hmonitor, MONITOR_DPI_TYPE dpiType, out uint dpiX, out uint dpiY);

        [DllImport("shcore.dll")]
        public static extern void GetScaleFactorForMonitor(IntPtr hMon, out uint pScale);

        [DllImport("user32.dll")]
        public static extern IntPtr MonitorFromPoint(POINT pt, MONITOR dwFlags);

        [DllImport("user32.dll")]
        public static extern IntPtr MonitorFromRect(RECT rect, MONITOR dwFlags);

        [DllImport("user32.dll")]
        public static extern IntPtr MonitorFromWindow(IntPtr hwnd, MONITOR dwFlags);
        
        [DllImport("user32", EntryPoint = "GetMonitorInfoW", ExactSpelling = true, CharSet = CharSet.Unicode)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetMonitorInfo([In] IntPtr hMonitor, [Out] MONITORINFO lpmi);

        [return: MarshalAs(UnmanagedType.Bool)]
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode, EntryPoint = "PostMessageW")]
        public static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

        [DllImport("gdi32.dll")]
        public static extern int SetDIBitsToDevice(IntPtr hdc, int XDest, int YDest, uint
                dwWidth, uint dwHeight, int XSrc, int YSrc, uint uStartScan, uint cScanLines,
            IntPtr lpvBits, [In] ref BITMAPINFOHEADER lpbmi, uint fuColorUse);
        
        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool CloseHandle(IntPtr hObject);
        [DllImport("gdi32.dll", SetLastError = true)]
        public static extern IntPtr CreateDIBSection(IntPtr hDC, ref BITMAPINFOHEADER pBitmapInfo, int un, out IntPtr lplpVoid, IntPtr handle, int dw);
        [DllImport("gdi32.dll")]
        public static extern int DeleteObject(IntPtr hObject);
        [DllImport("gdi32.dll", SetLastError = true)]
        public static extern IntPtr CreateCompatibleDC(IntPtr hdc);
        [DllImport("gdi32.dll")]
        public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hObject);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern IntPtr CreateFileMapping(IntPtr hFile,
            IntPtr lpFileMappingAttributes,
            uint flProtect,
            uint dwMaximumSizeHigh,
            uint dwMaximumSizeLow,
            string lpName);

        [DllImport("msvcrt.dll", EntryPoint="memcpy", SetLastError = false, CallingConvention=CallingConvention.Cdecl)]
        public static extern IntPtr CopyMemory(IntPtr dest, IntPtr src, UIntPtr count); 
        
        [DllImport("ole32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern HRESULT RegisterDragDrop(IntPtr hwnd, IDropTarget target);
        
        [DllImport("ole32.dll", EntryPoint = "OleInitialize")]
        public static extern HRESULT OleInitialize(IntPtr val);

        [DllImport("ole32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        internal static extern void ReleaseStgMedium(ref STGMEDIUM medium);

        [DllImport("user32.dll", BestFitMapping = false, CharSet = CharSet.Auto, SetLastError = true)]
        public static extern int GetClipboardFormatName(int format, StringBuilder lpString, int cchMax);

        [DllImport("user32.dll", BestFitMapping = false, CharSet = CharSet.Auto, SetLastError = true)]
        public static extern int RegisterClipboardFormat(string format);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, ExactSpelling = true, SetLastError = true)]
        public static extern IntPtr GlobalSize(IntPtr hGlobal);

        [DllImport("shell32.dll", BestFitMapping = false, CharSet = CharSet.Auto)]
        public static extern int DragQueryFile(IntPtr hDrop, int iFile, StringBuilder lpszFile, int cch);

        [DllImport("ole32.dll", CharSet = CharSet.Auto, ExactSpelling = true, PreserveSig = false)]
        public static extern void DoDragDrop(IDataObject dataObject, IDropSource dropSource, int allowedEffects, int[] finalEffect);



        public enum MONITOR
        {
            MONITOR_DEFAULTTONULL = 0x00000000,
            MONITOR_DEFAULTTOPRIMARY = 0x00000001,
            MONITOR_DEFAULTTONEAREST = 0x00000002,
        }

        [StructLayout(LayoutKind.Sequential)]
        internal class MONITORINFO
        {
            public int cbSize = Marshal.SizeOf<MONITORINFO>();
            public RECT rcMonitor = new RECT();
            public RECT rcWork = new RECT();
            public int dwFlags = 0;

            public enum MonitorOptions : uint
            {
                MONITOR_DEFAULTTONULL = 0x00000000,
                MONITOR_DEFAULTTOPRIMARY = 0x00000001,
                MONITOR_DEFAULTTONEAREST = 0x00000002
            }
        }


        public enum PROCESS_DPI_AWARENESS
        {
            PROCESS_DPI_UNAWARE = 0,
            PROCESS_SYSTEM_DPI_AWARE = 1,
            PROCESS_PER_MONITOR_DPI_AWARE = 2
        }

        public enum MONITOR_DPI_TYPE
        {
            MDT_EFFECTIVE_DPI = 0,
            MDT_ANGULAR_DPI = 1,
            MDT_RAW_DPI = 2,
            MDT_DEFAULT = MDT_EFFECTIVE_DPI
        } 

        public enum ClipboardFormat 
        {
            /// <summary>
            /// Text format. Each line ends with a carriage return/linefeed (CR-LF) combination. A null character signals the end of the data. Use this format for ANSI text.
            /// </summary>
            CF_TEXT = 1,
            /// <summary>
            /// A handle to a bitmap
            /// </summary>
            CF_BITMAP = 2,
            /// <summary>
            /// A memory object containing a BITMAPINFO structure followed by the bitmap bits.
            /// </summary>
            CF_DIB = 3,
            /// <summary>
            /// Unicode text format. Each line ends with a carriage return/linefeed (CR-LF) combination. A null character signals the end of the data.
            /// </summary>
            CF_UNICODETEXT = 13,
            /// <summary>
            /// A handle to type HDROP that identifies a list of files. 
            /// </summary>
            CF_HDROP = 15,
        }

        public struct MSG
        {
            public IntPtr hwnd;
            public uint message;
            public IntPtr wParam;
            public IntPtr lParam;
            public uint time;
            public POINT pt;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct PAINTSTRUCT
        {
            public IntPtr hdc;
            public bool fErase;
            public RECT rcPaint;
            public bool fRestore;
            public bool fIncUpdate;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
            public byte[] rgbReserved;
        }

        public struct POINT
        {
            public int X;
            public int Y;
        }

        public struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;

            public RECT(Rect rect)
            {
                left = (int)rect.X;
                top = (int)rect.Y;
                right = (int)(rect.X + rect.Width);
                bottom = (int)(rect.Y + rect.Height);
            }
        }

        public struct TRACKMOUSEEVENT
        {
            public int cbSize;
            public uint dwFlags;
            public IntPtr hwndTrack;
            public int dwHoverTime;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct WINDOWPLACEMENT
        {
            /// <summary>
            /// The length of the structure, in bytes. Before calling the GetWindowPlacement or SetWindowPlacement functions, set this member to sizeof(WINDOWPLACEMENT).
            /// <para>
            /// GetWindowPlacement and SetWindowPlacement fail if this member is not set correctly.
            /// </para>
            /// </summary>
            public int Length;

            /// <summary>
            /// Specifies flags that control the position of the minimized window and the method by which the window is restored.
            /// </summary>
            public int Flags;

            /// <summary>
            /// The current show state of the window.
            /// </summary>
            public ShowWindowCommand ShowCmd;

            /// <summary>
            /// The coordinates of the window's upper-left corner when the window is minimized.
            /// </summary>
            public POINT MinPosition;

            /// <summary>
            /// The coordinates of the window's upper-left corner when the window is maximized.
            /// </summary>
            public POINT MaxPosition;

            /// <summary>
            /// The window's coordinates when the window is in the restored position.
            /// </summary>
            public RECT NormalPosition;

            /// <summary>
            /// Gets the default (empty) value.
            /// </summary>
            public static WINDOWPLACEMENT Default
            {
                get
                {
                    WINDOWPLACEMENT result = new WINDOWPLACEMENT();
                    result.Length = Marshal.SizeOf(result);
                    return result;
                }
            }
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        public struct WNDCLASSEX
        {
            public int cbSize;
            public int style;
            public WndProc lpfnWndProc;
            public int cbClsExtra;
            public int cbWndExtra;
            public IntPtr hInstance;
            public IntPtr hIcon;
            public IntPtr hCursor;
            public IntPtr hbrBackground;
            public string lpszMenuName;
            public string lpszClassName;
            public IntPtr hIconSm;
        }

        [Flags]
        public enum OpenFileNameFlags
        {

            OFN_ALLOWMULTISELECT = 0x00000200,

            OFN_EXPLORER = 0x00080000,

            OFN_HIDEREADONLY = 0x00000004,

            OFN_NOREADONLYRETURN = 0x00008000,

            OFN_OVERWRITEPROMPT = 0x00000002

        }

        public enum HRESULT : long
        {
            S_FALSE = 0x0001,
            S_OK = 0x0000,
            E_INVALIDARG = 0x80070057,
            E_OUTOFMEMORY = 0x8007000E,
            E_NOTIMPL = 0x80004001,
            E_UNEXPECTED = 0x8000FFFF,
        }

        public enum Icons
        {
            ICON_SMALL = 0,
            ICON_BIG = 1
        }

        public const uint SIGDN_FILESYSPATH = 0x80058000;

        [Flags]
        internal enum FOS : uint
        {
            FOS_OVERWRITEPROMPT = 0x00000002,
            FOS_STRICTFILETYPES = 0x00000004,
            FOS_NOCHANGEDIR = 0x00000008,
            FOS_PICKFOLDERS = 0x00000020,
            FOS_FORCEFILESYSTEM = 0x00000040, // Ensure that items returned are filesystem items.
            FOS_ALLNONSTORAGEITEMS = 0x00000080, // Allow choosing items that have no storage.
            FOS_NOVALIDATE = 0x00000100,
            FOS_ALLOWMULTISELECT = 0x00000200,
            FOS_PATHMUSTEXIST = 0x00000800,
            FOS_FILEMUSTEXIST = 0x00001000,
            FOS_CREATEPROMPT = 0x00002000,
            FOS_SHAREAWARE = 0x00004000,
            FOS_NOREADONLYRETURN = 0x00008000,
            FOS_NOTESTFILECREATE = 0x00010000,
            FOS_HIDEMRUPLACES = 0x00020000,
            FOS_HIDEPINNEDPLACES = 0x00040000,
            FOS_NODEREFERENCELINKS = 0x00100000,
            FOS_DONTADDTORECENT = 0x02000000,
            FOS_FORCESHOWHIDDEN = 0x10000000,
            FOS_DEFAULTNOMINIMODE = 0x20000000
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        public struct OpenFileName
        {
            public int lStructSize;
            public IntPtr hwndOwner;
            public IntPtr hInstance;
            public IntPtr lpstrFilter;
            public IntPtr lpstrCustomFilter;
            public int nMaxCustFilter;
            public int nFilterIndex;
            public IntPtr lpstrFile;
            public int nMaxFile;
            public IntPtr lpstrFileTitle;
            public int nMaxFileTitle;
            public IntPtr lpstrInitialDir;
            public IntPtr lpstrTitle;
            public OpenFileNameFlags Flags;
            private readonly ushort Unused;
            private readonly ushort Unused2;
            public IntPtr lpstrDefExt;
            public IntPtr lCustData;
            public IntPtr lpfnHook;
            public IntPtr lpTemplateName;
            public IntPtr reservedPtr;
            public int reservedInt;
            public int flagsEx;
        }        
    }

    [ComImport(), Guid("42F85136-DB7E-439C-85F1-E4075D135FC8"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    internal interface IFileDialog
    {
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        [PreserveSig()]
        uint Show([In, Optional] IntPtr hwndOwner); //IModalWindow 


        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetFileTypes([In] uint cFileTypes, [In, MarshalAs(UnmanagedType.LPArray)] IntPtr rgFilterSpec);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetFileTypeIndex([In] uint iFileType);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint GetFileTypeIndex(out uint piFileType);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint Advise([In, MarshalAs(UnmanagedType.Interface)] IntPtr pfde, out uint pdwCookie);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint Unadvise([In] uint dwCookie);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetOptions([In] uint fos);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint GetOptions(out uint fos);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetDefaultFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint GetFolder([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint GetCurrentSelection([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetFileName([In, MarshalAs(UnmanagedType.LPWStr)] string pszName);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint GetFileName([MarshalAs(UnmanagedType.LPWStr)] out string pszName);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetTitle([In, MarshalAs(UnmanagedType.LPWStr)] string pszTitle);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetOkButtonLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszText);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetFileNameLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszLabel);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint GetResult([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint AddPlace([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, uint fdap);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetDefaultExtension([In, MarshalAs(UnmanagedType.LPWStr)] string pszDefaultExtension);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint Close([MarshalAs(UnmanagedType.Error)] uint hr);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetClientGuid([In] ref Guid guid);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint ClearClientData();

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint SetFilter([MarshalAs(UnmanagedType.Interface)] IntPtr pFilter);

    }


    [ComImport, Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    internal interface IShellItem
    {
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint BindToHandler([In] IntPtr pbc, [In] ref Guid rbhid, [In] ref Guid riid, [Out, MarshalAs(UnmanagedType.Interface)] out IntPtr ppvOut);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint GetParent([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint GetDisplayName([In] uint sigdnName, out IntPtr ppszName);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint GetAttributes([In] uint sfgaoMask, out uint psfgaoAttribs);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        uint Compare([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, [In] uint hint, out int piOrder);
        
    }
    
    [Flags]
    internal enum DropEffect : int
    {
        None = 0,
        Copy = 1,
        Move = 2,
        Link = 4,
        Scroll = -2147483648,
    }
    
    
    
    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("00000122-0000-0000-C000-000000000046")]
    internal interface IDropTarget
    {
        [PreserveSig]
        UnmanagedMethods.HRESULT DragEnter([MarshalAs(UnmanagedType.Interface)] [In] IDataObject pDataObj, [MarshalAs(UnmanagedType.U4)] [In] int grfKeyState, [MarshalAs(UnmanagedType.U8)] [In] long pt, [In] [Out] ref DropEffect pdwEffect);
        [PreserveSig]
        UnmanagedMethods.HRESULT DragOver([MarshalAs(UnmanagedType.U4)] [In] int grfKeyState, [MarshalAs(UnmanagedType.U8)] [In] long pt, [In] [Out] ref DropEffect pdwEffect);
        [PreserveSig]
        UnmanagedMethods.HRESULT DragLeave();
        [PreserveSig]
        UnmanagedMethods.HRESULT Drop([MarshalAs(UnmanagedType.Interface)] [In] IDataObject pDataObj, [MarshalAs(UnmanagedType.U4)] [In] int grfKeyState, [MarshalAs(UnmanagedType.U8)] [In] long pt, [In] [Out] ref DropEffect pdwEffect);
    }

    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("00000121-0000-0000-C000-000000000046")]
    internal interface IDropSource
    {
        [PreserveSig]
        int QueryContinueDrag(int fEscapePressed, [MarshalAs(UnmanagedType.U4)] [In] int grfKeyState);
        [PreserveSig]
        int GiveFeedback([MarshalAs(UnmanagedType.U4)] [In] int dwEffect);
    }


    [StructLayoutAttribute(LayoutKind.Sequential)]
    internal struct _DROPFILES
    {
        public Int32 pFiles;
        public Int32 X;
        public Int32 Y;
        public bool fNC;
        public bool fWide;
    }
}