How to receive WndProc messages in WPF

22 Apr 2015 — csharp

Access to the WindowProc callback function in Windows Forms is achieved by overriding void WndProc(ref Message m), this registers the window class to receive Windows event messages. However, in WPF, most elements are drawn onto the WPF canvas, and it’s common to only have a single hWnd which represents everything inside the window. Conversely, in a normal Win32 application most controls will have their own hWnd handle.

When registering to receive WndProc messages using WPF it is the Window handle, rather than a control handle that must be registered. We can get the Window handle from the System.Windows.Interop namespace class HwndSource which exposes a static FromVisual() method.

var hwndSource = PresentationSource.FromVisual(this) as HwndSource;
var hWnd = hwndSource.Handle;

The above code will return the window handle associated with the WPF application to hWnd typed as IntPtr. The HwndSource class also exposes an AddHook() method which, when supplied with a method signature matching the HwndSourceHook delegate adds an event handler which will receive all window messages. By defining a method which matches the delegate signature in our code and supplying it to AddHook() on the HwndSource instance of our WPF window, we receive all window messages.

This has to be done in the overridden OnSourceInitialized() method. If we tried to register the WndProc callback in the constructor, it would fail because we wouldn’t have a valid window hWnd handle at that point.

A complete example is included below;

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using System;
using System.Windows;
using System.Windows.Interop;

namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        /// <summary>
        /// ctor
        /// </summary>
        public MainWindow()
        {
            InitializeComponent();
        }

        /// <summary>
        /// AddHook Handle WndProc messages in WPF
        /// This cannot be done in a Window's constructor as a handle window handle won't at that point, so there won't be a HwndSource.
        /// </summary>
        /// <param name="e"></param>
        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);

            var hwndSource = PresentationSource.FromVisual(this) as HwndSource;
            if (hwndSource != null)
            {
                hwndSource.AddHook(WndProc);
            }
        }

        /// <summary>
        /// WndProc matches the HwndSourceHook delegate signature so it can be passed to AddHook() as a callback. This is the same as overriding a Windows.Form's WncProc method.
        /// </summary>
        /// <param name="hwnd">The window handle</param>
        /// <param name="msg">The message ID</param>
        /// <param name="wParam">The message's wParam value, historically used in the win32 api for handles and integers</param>
        /// <param name="lParam">The message's lParam value, historically used in the win32 api to pass pointers</param>
        /// <param name="handled">A value that indicates whether the message was handled</param>
        /// <returns></returns>
        private static IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            var message = (WindowMessage)msg;
            var subCode = (WindowMessageParameter)wParam.ToInt32();

            if (message == WindowMessage.WM_POWERBROADCAST)
            {
                if (subCode == WindowMessageParameter.PBT_APMRESUMEAUTOMATIC)
                {
                    // handle suspend resumed event
                }
            }

            return IntPtr.Zero;
        }
    }
}

You may have noticed the I’m casting msg into WindowMessage and wParam into WindowMessageParameter. This is simply for brevity.

I’ve found what I think is a fairly complete list of WindowMessage and WindowMessageParameter codes. In my case I was interested in capturing POWER_BROADCAST events, specifically to handle handl the SUSPEND_RESUME event. The message code corrosponding to the WM_POWERBROADCAST event is 0x0218 (or 218 in decimal given the parameter is an int) and diferentiated as PBT_APMRESUMEAUTOMATIC subcode 0x12 but the enum makes more readable code.

For an interesting bit of history about wParam and lParam, see this post on stackoverflow.com.

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using System;

namespace WpfApplication1
{
    /// <summary>
    /// From http://wiki.winehq.org/List_Of_Windows_Messages
    /// </summary>
    [Flags]
    public enum WindowMessage : uint
    {
        WM_NULL = 0x0,
        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_QUIT = 0x0012,
        WM_QUERYOPEN = 0x0013,
        WM_ERASEBKGND = 0x0014,
        WM_SYSCOLORCHANGE = 0x0015,
        WM_ENDSESSION = 0x0016,
        WM_SHOWWINDOW = 0x0018,
        WM_CTLCOLOR = 0x0019,
        WM_WININICHANGE = 0x001a,
        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_COMMNOTIFY = 0x0044,
        WM_WINDOWPOSCHANGING = 0x0046,
        WM_WINDOWPOSCHANGED = 0x0047,
        WM_POWER = 0x0048,
        WM_COPYGLOBALDATA = 0x0049,
        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,
        SBM_SETPOS = 0x00e0,
        SBM_GETPOS = 0x00e1,
        SBM_SETRANGE = 0x00e2,
        SBM_GETRANGE = 0x00e3,
        SBM_ENABLE_ARROWS = 0x00e4,
        SBM_SETRANGEREDRAW = 0x00e6,
        SBM_SETSCROLLINFO = 0x00e9,
        SBM_GETSCROLLINFO = 0x00ea,
        SBM_GETSCROLLBARINFO = 0x00eb,
        WM_INPUT = 0x00ff,
        WM_KEYDOWN = 0x0100,
        WM_KEYFIRST = 0x0100,
        WM_KEYUP = 0x0101,
        WM_CHAR = 0x0102,
        WM_DEADCHAR = 0x0103,
        WM_SYSKEYDOWN = 0x0104,
        WM_SYSKEYUP = 0x0105,
        WM_SYSCHAR = 0x0106,
        WM_SYSDEADCHAR = 0x0107,
        WM_KEYLAST = 0x0108,
        WM_WNT_CONVERTREQUESTEX = 0x0109,
        WM_CONVERTREQUEST = 0x010a,
        WM_CONVERTRESULT = 0x010b,
        WM_INTERIM = 0x010c,
        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_SYSTIMER = 0x0118,
        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_MOUSELAST = 0x0209,
        WM_MOUSEWHEEL = 0x020a,
        WM_XBUTTONDOWN = 0x020b,
        WM_XBUTTONUP = 0x020c,
        WM_XBUTTONDBLCLK = 0x020d,
        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_REPORT = 0x0280,
        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_IMEKEYDOWN = 0x0290,
        WM_IME_KEYDOWN = 0x0290,
        WM_IMEKEYUP = 0x0291,
        WM_IME_KEYUP = 0x0291,
        WM_NCMOUSEHOVER = 0x02a0,
        WM_MOUSEHOVER = 0x02a1,
        WM_NCMOUSELEAVE = 0x02a2,
        WM_MOUSELEAVE = 0x02a3,
        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_HANDHELDFIRST = 0x0358,
        WM_HANDHELDLAST = 0x035f,
        WM_AFXFIRST = 0x0360,
        WM_AFXLAST = 0x037f,
        WM_PENWINFIRST = 0x0380,
        WM_RCRESULT = 0x0381,
        WM_HOOKRCRESULT = 0x0382,
        WM_GLOBALRCCHANGE = 0x0383,
        WM_PENMISCINFO = 0x0383,
        WM_SKB = 0x0384,
        WM_HEDITCTL = 0x0385,
        WM_PENCTL = 0x0385,
        WM_PENMISC = 0x0386,
        WM_CTLINIT = 0x0387,
        WM_PENEVENT = 0x0388,
        WM_PENWINLAST = 0x038f,
        DDM_SETFMT = 0x0400,
        DM_GETDEFID = 0x0400,
        NIN_SELECT = 0x0400,
        TBM_GETPOS = 0x0400,
        WM_PSD_PAGESETUPDLG = 0x0400,
        WM_USER = 0x0400,
        CBEM_INSERTITEMA = 0x0401,
        DDM_DRAW = 0x0401,
        DM_SETDEFID = 0x0401,
        HKM_SETHOTKEY = 0x0401,
        PBM_SETRANGE = 0x0401,
        RB_INSERTBANDA = 0x0401,
        SB_SETTEXTA = 0x0401,
        TB_ENABLEBUTTON = 0x0401,
        TBM_GETRANGEMIN = 0x0401,
        TTM_ACTIVATE = 0x0401,
        WM_CHOOSEFONT_GETLOGFONT = 0x0401,
        WM_PSD_FULLPAGERECT = 0x0401,
        CBEM_SETIMAGELIST = 0x0402,
        DDM_CLOSE = 0x0402,
        DM_REPOSITION = 0x0402,
        HKM_GETHOTKEY = 0x0402,
        PBM_SETPOS = 0x0402,
        RB_DELETEBAND = 0x0402,
        SB_GETTEXTA = 0x0402,
        TB_CHECKBUTTON = 0x0402,
        TBM_GETRANGEMAX = 0x0402,
        WM_PSD_MINMARGINRECT = 0x0402,
        CBEM_GETIMAGELIST = 0x0403,
        DDM_BEGIN = 0x0403,
        HKM_SETRULES = 0x0403,
        PBM_DELTAPOS = 0x0403,
        RB_GETBARINFO = 0x0403,
        SB_GETTEXTLENGTHA = 0x0403,
        TBM_GETTIC = 0x0403,
        TB_PRESSBUTTON = 0x0403,
        TTM_SETDELAYTIME = 0x0403,
        WM_PSD_MARGINRECT = 0x0403,
        CBEM_GETITEMA = 0x0404,
        DDM_END = 0x0404,
        PBM_SETSTEP = 0x0404,
        RB_SETBARINFO = 0x0404,
        SB_SETPARTS = 0x0404,
        TB_HIDEBUTTON = 0x0404,
        TBM_SETTIC = 0x0404,
        TTM_ADDTOOLA = 0x0404,
        WM_PSD_GREEKTEXTRECT = 0x0404,
        CBEM_SETITEMA = 0x0405,
        PBM_STEPIT = 0x0405,
        TB_INDETERMINATE = 0x0405,
        TBM_SETPOS = 0x0405,
        TTM_DELTOOLA = 0x0405,
        WM_PSD_ENVSTAMPRECT = 0x0405,
        CBEM_GETCOMBOCONTROL = 0x0406,
        PBM_SETRANGE32 = 0x0406,
        RB_SETBANDINFOA = 0x0406,
        SB_GETPARTS = 0x0406,
        TB_MARKBUTTON = 0x0406,
        TBM_SETRANGE = 0x0406,
        TTM_NEWTOOLRECTA = 0x0406,
        WM_PSD_YAFULLPAGERECT = 0x0406,
        CBEM_GETEDITCONTROL = 0x0407,
        PBM_GETRANGE = 0x0407,
        RB_SETPARENT = 0x0407,
        SB_GETBORDERS = 0x0407,
        TBM_SETRANGEMIN = 0x0407,
        TTM_RELAYEVENT = 0x0407,
        CBEM_SETEXSTYLE = 0x0408,
        PBM_GETPOS = 0x0408,
        RB_HITTEST = 0x0408,
        SB_SETMINHEIGHT = 0x0408,
        TBM_SETRANGEMAX = 0x0408,
        TTM_GETTOOLINFOA = 0x0408,
        CBEM_GETEXSTYLE = 0x0409,
        CBEM_GETEXTENDEDSTYLE = 0x0409,
        PBM_SETBARCOLOR = 0x0409,
        RB_GETRECT = 0x0409,
        SB_SIMPLE = 0x0409,
        TB_ISBUTTONENABLED = 0x0409,
        TBM_CLEARTICS = 0x0409,
        TTM_SETTOOLINFOA = 0x0409,
        CBEM_HASEDITCHANGED = 0x040a,
        RB_INSERTBANDW = 0x040a,
        SB_GETRECT = 0x040a,
        TB_ISBUTTONCHECKED = 0x040a,
        TBM_SETSEL = 0x040a,
        TTM_HITTESTA = 0x040a,
        WIZ_QUERYNUMPAGES = 0x040a,
        CBEM_INSERTITEMW = 0x040b,
        RB_SETBANDINFOW = 0x040b,
        SB_SETTEXTW = 0x040b,
        TB_ISBUTTONPRESSED = 0x040b,
        TBM_SETSELSTART = 0x040b,
        TTM_GETTEXTA = 0x040b,
        WIZ_NEXT = 0x040b,
        CBEM_SETITEMW = 0x040c,
        RB_GETBANDCOUNT = 0x040c,
        SB_GETTEXTLENGTHW = 0x040c,
        TB_ISBUTTONHIDDEN = 0x040c,
        TBM_SETSELEND = 0x040c,
        TTM_UPDATETIPTEXTA = 0x040c,
        WIZ_PREV = 0x040c,
        CBEM_GETITEMW = 0x040d,
        RB_GETROWCOUNT = 0x040d,
        SB_GETTEXTW = 0x040d,
        TB_ISBUTTONINDETERMINATE = 0x040d,
        TTM_GETTOOLCOUNT = 0x040d,
        CBEM_SETEXTENDEDSTYLE = 0x040e,
        RB_GETROWHEIGHT = 0x040e,
        SB_ISSIMPLE = 0x040e,
        TB_ISBUTTONHIGHLIGHTED = 0x040e,
        TBM_GETPTICS = 0x040e,
        TTM_ENUMTOOLSA = 0x040e,
        SB_SETICON = 0x040f,
        TBM_GETTICPOS = 0x040f,
        TTM_GETCURRENTTOOLA = 0x040f,
        RB_IDTOINDEX = 0x0410,
        SB_SETTIPTEXTA = 0x0410,
        TBM_GETNUMTICS = 0x0410,
        TTM_WINDOWFROMPOINT = 0x0410,
        RB_GETTOOLTIPS = 0x0411,
        SB_SETTIPTEXTW = 0x0411,
        TBM_GETSELSTART = 0x0411,
        TB_SETSTATE = 0x0411,
        TTM_TRACKACTIVATE = 0x0411,
        RB_SETTOOLTIPS = 0x0412,
        SB_GETTIPTEXTA = 0x0412,
        TB_GETSTATE = 0x0412,
        TBM_GETSELEND = 0x0412,
        TTM_TRACKPOSITION = 0x0412,
        RB_SETBKCOLOR = 0x0413,
        SB_GETTIPTEXTW = 0x0413,
        TB_ADDBITMAP = 0x0413,
        TBM_CLEARSEL = 0x0413,
        TTM_SETTIPBKCOLOR = 0x0413,
        RB_GETBKCOLOR = 0x0414,
        SB_GETICON = 0x0414,
        TB_ADDBUTTONSA = 0x0414,
        TBM_SETTICFREQ = 0x0414,
        TTM_SETTIPTEXTCOLOR = 0x0414,
        RB_SETTEXTCOLOR = 0x0415,
        TB_INSERTBUTTONA = 0x0415,
        TBM_SETPAGESIZE = 0x0415,
        TTM_GETDELAYTIME = 0x0415,
        RB_GETTEXTCOLOR = 0x0416,
        TB_DELETEBUTTON = 0x0416,
        TBM_GETPAGESIZE = 0x0416,
        TTM_GETTIPBKCOLOR = 0x0416,
        RB_SIZETORECT = 0x0417,
        TB_GETBUTTON = 0x0417,
        TBM_SETLINESIZE = 0x0417,
        TTM_GETTIPTEXTCOLOR = 0x0417,
        RB_BEGINDRAG = 0x0418,
        TB_BUTTONCOUNT = 0x0418,
        TBM_GETLINESIZE = 0x0418,
        TTM_SETMAXTIPWIDTH = 0x0418,
        RB_ENDDRAG = 0x0419,
        TB_COMMANDTOINDEX = 0x0419,
        TBM_GETTHUMBRECT = 0x0419,
        TTM_GETMAXTIPWIDTH = 0x0419,
        RB_DRAGMOVE = 0x041a,
        TBM_GETCHANNELRECT = 0x041a,
        TB_SAVERESTOREA = 0x041a,
        TTM_SETMARGIN = 0x041a,
        RB_GETBARHEIGHT = 0x041b,
        TB_CUSTOMIZE = 0x041b,
        TBM_SETTHUMBLENGTH = 0x041b,
        TTM_GETMARGIN = 0x041b,
        RB_GETBANDINFOW = 0x041c,
        TB_ADDSTRINGA = 0x041c,
        TBM_GETTHUMBLENGTH = 0x041c,
        TTM_POP = 0x041c,
        RB_GETBANDINFOA = 0x041d,
        TB_GETITEMRECT = 0x041d,
        TBM_SETTOOLTIPS = 0x041d,
        TTM_UPDATE = 0x041d,
        RB_MINIMIZEBAND = 0x041e,
        TB_BUTTONSTRUCTSIZE = 0x041e,
        TBM_GETTOOLTIPS = 0x041e,
        TTM_GETBUBBLESIZE = 0x041e,
        RB_MAXIMIZEBAND = 0x041f,
        TBM_SETTIPSIDE = 0x041f,
        TB_SETBUTTONSIZE = 0x041f,
        TTM_ADJUSTRECT = 0x041f,
        TBM_SETBUDDY = 0x0420,
        TB_SETBITMAPSIZE = 0x0420,
        TTM_SETTITLEA = 0x0420,
        MSG_FTS_JUMP_VA = 0x0421,
        TB_AUTOSIZE = 0x0421,
        TBM_GETBUDDY = 0x0421,
        TTM_SETTITLEW = 0x0421,
        RB_GETBANDBORDERS = 0x0422,
        MSG_FTS_JUMP_QWORD = 0x0423,
        RB_SHOWBAND = 0x0423,
        TB_GETTOOLTIPS = 0x0423,
        MSG_REINDEX_REQUEST = 0x0424,
        TB_SETTOOLTIPS = 0x0424,
        MSG_FTS_WHERE_IS_IT = 0x0425,
        RB_SETPALETTE = 0x0425,
        TB_SETPARENT = 0x0425,
        RB_GETPALETTE = 0x0426,
        RB_MOVEBAND = 0x0427,
        TB_SETROWS = 0x0427,
        TB_GETROWS = 0x0428,
        TB_GETBITMAPFLAGS = 0x0429,
        TB_SETCMDID = 0x042a,
        RB_PUSHCHEVRON = 0x042b,
        TB_CHANGEBITMAP = 0x042b,
        TB_GETBITMAP = 0x042c,
        MSG_GET_DEFFONT = 0x042d,
        TB_GETBUTTONTEXTA = 0x042d,
        TB_REPLACEBITMAP = 0x042e,
        TB_SETINDENT = 0x042f,
        TB_SETIMAGELIST = 0x0430,
        TB_GETIMAGELIST = 0x0431,
        TB_LOADIMAGES = 0x0432,
        TTM_ADDTOOLW = 0x0432,
        TB_GETRECT = 0x0433,
        TTM_DELTOOLW = 0x0433,
        TB_SETHOTIMAGELIST = 0x0434,
        TTM_NEWTOOLRECTW = 0x0434,
        TB_GETHOTIMAGELIST = 0x0435,
        TTM_GETTOOLINFOW = 0x0435,
        TB_SETDISABLEDIMAGELIST = 0x0436,
        TTM_SETTOOLINFOW = 0x0436,
        TB_GETDISABLEDIMAGELIST = 0x0437,
        TTM_HITTESTW = 0x0437,
        TB_SETSTYLE = 0x0438,
        TTM_GETTEXTW = 0x0438,
        TB_GETSTYLE = 0x0439,
        TTM_UPDATETIPTEXTW = 0x0439,
        TB_GETBUTTONSIZE = 0x043a,
        TTM_ENUMTOOLSW = 0x043a,
        TB_SETBUTTONWIDTH = 0x043b,
        TTM_GETCURRENTTOOLW = 0x043b,
        TB_SETMAXTEXTROWS = 0x043c,
        TB_GETTEXTROWS = 0x043d,
        TB_GETOBJECT = 0x043e,
        TB_GETBUTTONINFOW = 0x043f,
        TB_SETBUTTONINFOW = 0x0440,
        TB_GETBUTTONINFOA = 0x0441,
        TB_SETBUTTONINFOA = 0x0442,
        TB_INSERTBUTTONW = 0x0443,
        TB_ADDBUTTONSW = 0x0444,
        TB_HITTEST = 0x0445,
        TB_SETDRAWTEXTFLAGS = 0x0446,
        TB_GETHOTITEM = 0x0447,
        TB_SETHOTITEM = 0x0448,
        TB_SETANCHORHIGHLIGHT = 0x0449,
        TB_GETANCHORHIGHLIGHT = 0x044a,
        TB_GETBUTTONTEXTW = 0x044b,
        TB_SAVERESTOREW = 0x044c,
        TB_ADDSTRINGW = 0x044d,
        TB_MAPACCELERATORA = 0x044e,
        TB_GETINSERTMARK = 0x044f,
        TB_SETINSERTMARK = 0x0450,
        TB_INSERTMARKHITTEST = 0x0451,
        TB_MOVEBUTTON = 0x0452,
        TB_GETMAXSIZE = 0x0453,
        TB_SETEXTENDEDSTYLE = 0x0454,
        TB_GETEXTENDEDSTYLE = 0x0455,
        TB_GETPADDING = 0x0456,
        TB_SETPADDING = 0x0457,
        TB_SETINSERTMARKCOLOR = 0x0458,
        TB_GETINSERTMARKCOLOR = 0x0459,
        TB_MAPACCELERATORW = 0x045a,
        TB_GETSTRINGW = 0x045b,
        TB_GETSTRINGA = 0x045c,
        TAPI_REPLY = 0x0463,
        ACM_OPENA = 0x0464,
        BFFM_SETSTATUSTEXTA = 0x0464,
        CDM_FIRST = 0x0464,
        CDM_GETSPEC = 0x0464,
        IPM_CLEARADDRESS = 0x0464,
        WM_CAP_UNICODE_START = 0x0464,
        ACM_PLAY = 0x0465,
        BFFM_ENABLEOK = 0x0465,
        CDM_GETFILEPATH = 0x0465,
        IPM_SETADDRESS = 0x0465,
        PSM_SETCURSEL = 0x0465,
        UDM_SETRANGE = 0x0465,
        WM_CHOOSEFONT_SETLOGFONT = 0x0465,
        ACM_STOP = 0x0466,
        BFFM_SETSELECTIONA = 0x0466,
        CDM_GETFOLDERPATH = 0x0466,
        IPM_GETADDRESS = 0x0466,
        PSM_REMOVEPAGE = 0x0466,
        UDM_GETRANGE = 0x0466,
        WM_CAP_SET_CALLBACK_ERRORW = 0x0466,
        WM_CHOOSEFONT_SETFLAGS = 0x0466,
        ACM_OPENW = 0x0467,
        BFFM_SETSELECTIONW = 0x0467,
        CDM_GETFOLDERIDLIST = 0x0467,
        IPM_SETRANGE = 0x0467,
        PSM_ADDPAGE = 0x0467,
        UDM_SETPOS = 0x0467,
        WM_CAP_SET_CALLBACK_STATUSW = 0x0467,
        BFFM_SETSTATUSTEXTW = 0x0468,
        CDM_SETCONTROLTEXT = 0x0468,
        IPM_SETFOCUS = 0x0468,
        PSM_CHANGED = 0x0468,
        UDM_GETPOS = 0x0468,
        CDM_HIDECONTROL = 0x0469,
        IPM_ISBLANK = 0x0469,
        PSM_RESTARTWINDOWS = 0x0469,
        UDM_SETBUDDY = 0x0469,
        CDM_SETDEFEXT = 0x046a,
        PSM_REBOOTSYSTEM = 0x046a,
        UDM_GETBUDDY = 0x046a,
        PSM_CANCELTOCLOSE = 0x046b,
        UDM_SETACCEL = 0x046b,
        EM_CONVPOSITION = 0x046c,
        PSM_QUERYSIBLINGS = 0x046c,
        UDM_GETACCEL = 0x046c,
        MCIWNDM_GETZOOM = 0x046d,
        PSM_UNCHANGED = 0x046d,
        UDM_SETBASE = 0x046d,
        PSM_APPLY = 0x046e,
        UDM_GETBASE = 0x046e,
        PSM_SETTITLEA = 0x046f,
        UDM_SETRANGE32 = 0x046f,
        PSM_SETWIZBUTTONS = 0x0470,
        UDM_GETRANGE32 = 0x0470,
        WM_CAP_DRIVER_GET_NAMEW = 0x0470,
        PSM_PRESSBUTTON = 0x0471,
        UDM_SETPOS32 = 0x0471,
        WM_CAP_DRIVER_GET_VERSIONW = 0x0471,
        PSM_SETCURSELID = 0x0472,
        UDM_GETPOS32 = 0x0472,
        PSM_SETFINISHTEXTA = 0x0473,
        PSM_GETTABCONTROL = 0x0474,
        PSM_ISDIALOGMESSAGE = 0x0475,
        MCIWNDM_REALIZE = 0x0476,
        PSM_GETCURRENTPAGEHWND = 0x0476,
        MCIWNDM_SETTIMEFORMATA = 0x0477,
        PSM_INSERTPAGE = 0x0477,
        MCIWNDM_GETTIMEFORMATA = 0x0478,
        PSM_SETTITLEW = 0x0478,
        WM_CAP_FILE_SET_CAPTURE_FILEW = 0x0478,
        MCIWNDM_VALIDATEMEDIA = 0x0479,
        PSM_SETFINISHTEXTW = 0x0479,
        WM_CAP_FILE_GET_CAPTURE_FILEW = 0x0479,
        MCIWNDM_PLAYTO = 0x047b,
        WM_CAP_FILE_SAVEASW = 0x047b,
        MCIWNDM_GETFILENAMEA = 0x047c,
        MCIWNDM_GETDEVICEA = 0x047d,
        PSM_SETHEADERTITLEA = 0x047d,
        WM_CAP_FILE_SAVEDIBW = 0x047d,
        MCIWNDM_GETPALETTE = 0x047e,
        PSM_SETHEADERTITLEW = 0x047e,
        MCIWNDM_SETPALETTE = 0x047f,
        PSM_SETHEADERSUBTITLEA = 0x047f,
        MCIWNDM_GETERRORA = 0x0480,
        PSM_SETHEADERSUBTITLEW = 0x0480,
        PSM_HWNDTOINDEX = 0x0481,
        PSM_INDEXTOHWND = 0x0482,
        MCIWNDM_SETINACTIVETIMER = 0x0483,
        PSM_PAGETOINDEX = 0x0483,
        PSM_INDEXTOPAGE = 0x0484,
        DL_BEGINDRAG = 0x0485,
        MCIWNDM_GETINACTIVETIMER = 0x0485,
        PSM_IDTOINDEX = 0x0485,
        DL_DRAGGING = 0x0486,
        PSM_INDEXTOID = 0x0486,
        DL_DROPPED = 0x0487,
        PSM_GETRESULT = 0x0487,
        DL_CANCELDRAG = 0x0488,
        PSM_RECALCPAGESIZES = 0x0488,
        MCIWNDM_GET_SOURCE = 0x048c,
        MCIWNDM_PUT_SOURCE = 0x048d,
        MCIWNDM_GET_DEST = 0x048e,
        MCIWNDM_PUT_DEST = 0x048f,
        MCIWNDM_CAN_PLAY = 0x0490,
        MCIWNDM_CAN_WINDOW = 0x0491,
        MCIWNDM_CAN_RECORD = 0x0492,
        MCIWNDM_CAN_SAVE = 0x0493,
        MCIWNDM_CAN_EJECT = 0x0494,
        MCIWNDM_CAN_CONFIG = 0x0495,
        IE_GETINK = 0x0496,
        IE_MSGFIRST = 0x0496,
        MCIWNDM_PALETTEKICK = 0x0496,
        IE_SETINK = 0x0497,
        IE_GETPENTIP = 0x0498,
        IE_SETPENTIP = 0x0499,
        IE_GETERASERTIP = 0x049a,
        IE_SETERASERTIP = 0x049b,
        IE_GETBKGND = 0x049c,
        IE_SETBKGND = 0x049d,
        IE_GETGRIDORIGIN = 0x049e,
        IE_SETGRIDORIGIN = 0x049f,
        IE_GETGRIDPEN = 0x04a0,
        IE_SETGRIDPEN = 0x04a1,
        IE_GETGRIDSIZE = 0x04a2,
        IE_SETGRIDSIZE = 0x04a3,
        IE_GETMODE = 0x04a4,
        IE_SETMODE = 0x04a5,
        IE_GETINKRECT = 0x04a6,
        WM_CAP_SET_MCI_DEVICEW = 0x04a6,
        WM_CAP_GET_MCI_DEVICEW = 0x04a7,
        WM_CAP_PAL_OPENW = 0x04b4,
        WM_CAP_PAL_SAVEW = 0x04b5,
        IE_GETAPPDATA = 0x04b8,
        IE_SETAPPDATA = 0x04b9,
        IE_GETDRAWOPTS = 0x04ba,
        IE_SETDRAWOPTS = 0x04bb,
        IE_GETFORMAT = 0x04bc,
        IE_SETFORMAT = 0x04bd,
        IE_GETINKINPUT = 0x04be,
        IE_SETINKINPUT = 0x04bf,
        IE_GETNOTIFY = 0x04c0,
        IE_SETNOTIFY = 0x04c1,
        IE_GETRECOG = 0x04c2,
        IE_SETRECOG = 0x04c3,
        IE_GETSECURITY = 0x04c4,
        IE_SETSECURITY = 0x04c5,
        IE_GETSEL = 0x04c6,
        IE_SETSEL = 0x04c7,
        CDM_LAST = 0x04c8,
        IE_DOCOMMAND = 0x04c8,
        MCIWNDM_NOTIFYMODE = 0x04c8,
        IE_GETCOMMAND = 0x04c9,
        IE_GETCOUNT = 0x04ca,
        IE_GETGESTURE = 0x04cb,
        MCIWNDM_NOTIFYMEDIA = 0x04cb,
        IE_GETMENU = 0x04cc,
        IE_GETPAINTDC = 0x04cd,
        MCIWNDM_NOTIFYERROR = 0x04cd,
        IE_GETPDEVENT = 0x04ce,
        IE_GETSELCOUNT = 0x04cf,
        IE_GETSELITEMS = 0x04d0,
        IE_GETSTYLE = 0x04d1,
        MCIWNDM_SETTIMEFORMATW = 0x04db,
        EM_OUTLINE = 0x04dc,
        MCIWNDM_GETTIMEFORMATW = 0x04dc,
        EM_GETSCROLLPOS = 0x04dd,
        EM_SETSCROLLPOS = 0x04de,
        EM_SETFONTSIZE = 0x04df,
        MCIWNDM_GETFILENAMEW = 0x04e0,
        MCIWNDM_GETDEVICEW = 0x04e1,
        MCIWNDM_GETERRORW = 0x04e4,
        FM_GETFOCUS = 0x0600,
        FM_GETDRIVEINFOA = 0x0601,
        FM_GETSELCOUNT = 0x0602,
        FM_GETSELCOUNTLFN = 0x0603,
        FM_GETFILESELA = 0x0604,
        FM_GETFILESELLFNA = 0x0605,
        FM_REFRESH_WINDOWS = 0x0606,
        FM_RELOAD_EXTENSIONS = 0x0607,
        FM_GETDRIVEINFOW = 0x0611,
        FM_GETFILESELW = 0x0614,
        FM_GETFILESELLFNW = 0x0615,
        WLX_WM_SAS = 0x0659,
        SM_GETSELCOUNT = 0x07e8,
        UM_GETSELCOUNT = 0x07e8,
        WM_CPL_LAUNCH = 0x07e8,
        SM_GETSERVERSELA = 0x07e9,
        UM_GETUSERSELA = 0x07e9,
        WM_CPL_LAUNCHED = 0x07e9,
        SM_GETSERVERSELW = 0x07ea,
        UM_GETUSERSELW = 0x07ea,
        SM_GETCURFOCUSA = 0x07eb,
        UM_GETGROUPSELA = 0x07eb,
        SM_GETCURFOCUSW = 0x07ec,
        UM_GETGROUPSELW = 0x07ec,
        SM_GETOPTIONS = 0x07ed,
        UM_GETCURFOCUSA = 0x07ed,
        UM_GETCURFOCUSW = 0x07ee,
        UM_GETOPTIONS = 0x07ef,
        UM_GETOPTIONS2 = 0x07f0,
        OCMBASE = 0x2000,
        OCM_CTLCOLOR = 0x2019,
        OCM_DRAWITEM = 0x202b,
        OCM_MEASUREITEM = 0x202c,
        OCM_DELETEITEM = 0x202d,
        OCM_VKEYTOITEM = 0x202e,
        OCM_CHARTOITEM = 0x202f,
        OCM_COMPAREITEM = 0x2039,
        OCM_NOTIFY = 0x204e,
        OCM_COMMAND = 0x2111,
        OCM_HSCROLL = 0x2114,
        OCM_VSCROLL = 0x2115,
        OCM_CTLCOLORMSGBOX = 0x2132,
        OCM_CTLCOLOREDIT = 0x2133,
        OCM_CTLCOLORLISTBOX = 0x2134,
        OCM_CTLCOLORBTN = 0x2135,
        OCM_CTLCOLORDLG = 0x2136,
        OCM_CTLCOLORSCROLLBAR = 0x2137,
        OCM_CTLCOLORSTATIC = 0x2138,
        OCM_PARENTNOTIFY = 0x2210,
        WM_APP = 0x8000,
        WM_RASDIALEVENT = 0xcccd
    }

    /// <summary>
    /// From https://msdn.microsoft.com/en-us/library/windows/desktop/aa372716(v=vs.85).aspx
    /// </summary>
    [Flags]
    public enum WindowMessageParameter : uint
    {
        PBT_APMQUERYSUSPEND = 0x0,
        PBT_APMBATTERYLOW = 0x9, // Notifies applications that the battery power is low.
        PBT_APMOEMEVENT = 0xb, // Notifies applications that the APM BIOS has signalled  an APM OEM event.
        PBT_APMQUERYSTANDBY = 0x0001, // 
        PBT_APMPOWERSTATUSCHANGE = 0xa, // Notifies applications of a change in the power status of the computer, such as a switch from battery power to A/C. The system also broadcasts this event when remaining battery power slips below the threshold specified by the user or if the battery power changes by a specified percentage.
        PBT_APMQUERYSUSPENDFAILED = 0x218, // Notifies applications that permission to suspend the computer was denied.
        PBT_APMRESUMEAUTOMATIC = 0x12, // Notifies applications that the system is resuming from sleep or hibernation. If the system detects any user activity after broadcasting PBT_APMRESUMEAUTOMATIC, it will broadcast a PBT_APMRESUMESUSPEND event to let applications know they can resume full interaction with the user.
        PBT_APMRESUMECRITICAL = 0x6, // Notifies applications that the system has resumed operation.
        PBT_APMRESUMESUSPEND = 0x7, // Notifies applications that the system has resumed operation after being suspended.
        PBT_APMSUSPEND = 0x4, // Notifies applications that the computer is about to enter a suspended state. 
        PBT_POWERSETTINGCHANGE = 0x8013, // Notifies applications that a power setting change event occurred.
        WM_POWER = 0x48, // Notifies applications that the system, typically a battery-powered personal computer, is about to enter a suspended mode.
    	WM_POWERBROADCAST = 0x218, // Notifies applications that a power-management event has occurred.
        BROADCAST_QUERY_DENY = 0x424D5144 //
    }
}
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