by Fenton Webb
Leading on from this post How to react to the cursor keys properly (without affecting AutoCAD) using ObjectARX? I thought I’d show you guys how to do the same in .NET, mainly because I had originally done something very similar back in 2006.
So, back when I was using AutoCAD 2007, I got a question from a developer asking if it was possible to call acedRegisterWinFilterMsg() from .NET. The answer was yes of course, but, if I remember correctly, it was only supported using .NET 2.0. The reason was because the PInvoke attribute I mention just below did not exist prior to 2.0, here it is:
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
I remember back then that it took a little playing around with to get it working, because at that time there wasn’t much documentation on the subject, don’t be put off by the unusual keywords, take note of the syntax – it’ll be useful for you in the future.
Here’s the code, I hope you like it…
// calling acedRegisterFilterWinMsg() and acedRemoveFilterWinMsg
// from .NET by Fenton Webb, DevTech, Autodesk 08/06/2012
// (derived from original example implemented back in 2006)
bool cursDone = false;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate int WindowHookProc(ref System.Windows.Forms.Message msg);
private WindowHookProc callBackFunc = null;
[CommandMethod("curskeys")]
public void curskeys()
{
// if already hooked
if (cursDone == true)
return;
// get the editor object
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("\nCursor filtering enabled…");
callBackFunc = new WindowHookProc(this.WindowsHook);
if (acedRegisterFilterWinMsg(callBackFunc) == 0)
ed.WriteMessage("\nCan’t register Windows cursor-key msg hook");
else
cursDone = true;
}
// Stop using filterCurs() for processing key presses
[CommandMethod("nocurskeys")]
public void nocurskeys()
{
if (cursDone == true)
{
acedRemoveFilterWinMsg(callBackFunc);
cursDone = false;
}
}
public enum WndMsg
{
WM_ACTIVATE = 0x6,
WM_ACTIVATEAPP = 0x1c,
WM_AFXFIRST = 0x360,
WM_AFXLAST = 0x37f,
WM_APP = 0x8000,
WM_ASKCBFORMATNAME = 0x30c,
WM_CANCELJOURNAL = 0x4b,
WM_CANCELMODE = 0x1f,
WM_CAPTURECHANGED = 0x215,
WM_CHANGECBCHAIN = 0x30d,
WM_CHANGEUISTATE = 0x127,
WM_CHAR = 0x102,
WM_CHARTOITEM = 0x2f,
WM_CHILDACTIVATE = 0x22,
WM_CLEAR = 0x303,
WM_CLOSE = 0x10,
WM_COMMAND = 0x111,
WM_COMPACTING = 0x41,
WM_COMPAREITEM = 0x39,
WM_CONTEXTMENU = 0x7b,
WM_COPY = 0x301,
WM_COPYDATA = 0x4a,
WM_CREATE = 0x1,
WM_CTLCOLORBTN = 0x135,
WM_CTLCOLORDLG = 0x136,
WM_CTLCOLOREDIT = 0x133,
WM_CTLCOLORLISTBOX = 0x134,
WM_CTLCOLORMSGBOX = 0x132,
WM_CTLCOLORSCROLLBAR = 0x137,
WM_CTLCOLORSTATIC = 0x138,
WM_CUT = 0x300,
WM_DEADCHAR = 0x103,
WM_DELETEITEM = 0x2d,
WM_DESTROY = 0x2,
WM_DESTROYCLIPBOARD = 0x307,
WM_DEVICECHANGE = 0x219,
WM_DEVMODECHANGE = 0x1b,
WM_DISPLAYCHANGE = 0x7e,
WM_DRAWCLIPBOARD = 0x308,
WM_DRAWITEM = 0x2b,
WM_DROPFILES = 0x233,
WM_ENABLE = 0xa,
WM_ENDSESSION = 0x16,
WM_ENTERIDLE = 0x121,
WM_ENTERMENULOOP = 0x211,
WM_ENTERSIZEMOVE = 0x231,
WM_ERASEBKGND = 0x14,
WM_EXITMENULOOP = 0x212,
WM_EXITSIZEMOVE = 0x232,
WM_FONTCHANGE = 0x1d,
WM_GETDLGCODE = 0x87,
WM_GETFONT = 0x31,
WM_GETHOTKEY = 0x33,
WM_GETICON = 0x7f,
WM_GETMINMAXINFO = 0x24,
WM_GETOBJECT = 0x3d,
WM_GETTEXT = 0xd,
WM_GETTEXTLENGTH = 0xe,
WM_HANDHELDFIRST = 0x358,
WM_HANDHELDLAST = 0x35f,
WM_HELP = 0x53,
WM_HOTKEY = 0x312,
WM_HSCROLL = 0x114,
WM_HSCROLLCLIPBOARD = 0x30e,
WM_ICONERASEBKGND = 0x27,
WM_IME_CHAR = 0x286,
WM_IME_COMPOSITION = 0x10f,
WM_IME_COMPOSITIONFULL = 0x284,
WM_IME_CONTROL = 0x283,
WM_IME_ENDCOMPOSITION = 0x10e,
WM_IME_KEYDOWN = 0x290,
WM_IME_KEYLAST = 0x10f,
WM_IME_KEYUP = 0x291,
WM_IME_NOTIFY = 0x282,
WM_IME_REQUEST = 0x288,
WM_IME_SELECT = 0x285,
WM_IME_SETCONTEXT = 0x281,
WM_IME_STARTCOMPOSITION = 0x10d,
WM_INITDIALOG = 0x110,
WM_INITMENU = 0x116,
WM_INITMENUPOPUP = 0x117,
WM_INPUTLANGCHANGE = 0x51,
WM_INPUTLANGCHANGEREQUEST = 0x50,
WM_KEYDOWN = 0x100,
WM_KEYFIRST = 0x100,
WM_KEYLAST = 0x108,
WM_KEYUP = 0x101,
WM_KILLFOCUS = 0x8,
WM_LBUTTONDBLCLK = 0x203,
WM_LBUTTONDOWN = 0x201,
WM_LBUTTONUP = 0x202,
WM_MBUTTONDBLCLK = 0x209,
WM_MBUTTONDOWN = 0x207,
WM_MBUTTONUP = 0x208,
WM_MDIACTIVATE = 0x222,
WM_MDICASCADE = 0x227,
WM_MDICREATE = 0x220,
WM_MDIDESTROY = 0x221,
WM_MDIGETACTIVE = 0x229,
WM_MDIICONARRANGE = 0x228,
WM_MDIMAXIMIZE = 0x225,
WM_MDINEXT = 0x224,
WM_MDIREFRESHMENU = 0x234,
WM_MDIRESTORE = 0x223,
WM_MDISETMENU = 0x230,
WM_MDITILE = 0x226,
WM_MEASUREITEM = 0x2c,
WM_MENUCHAR = 0x120,
WM_MENUCOMMAND = 0x126,
WM_MENUDRAG = 0x123,
WM_MENUGETOBJECT = 0x124,
WM_MENURBUTTONUP = 0x122,
WM_MENUSELECT = 0x11f,
WM_MOUSEACTIVATE = 0x21,
WM_MOUSEFIRST = 0x200,
WM_MOUSEHOVER = 0x2a1,
WM_MOUSELAST = 0x20d,
WM_MOUSELEAVE = 0x2a3,
WM_MOUSEMOVE = 0x200,
WM_MOUSEWHEEL = 0x20a,
WM_MOUSEHWHEEL = 0x20e,
WM_MOVE = 0x3,
WM_MOVING = 0x216,
WM_NCACTIVATE = 0x86,
WM_NCCALCSIZE = 0x83,
WM_NCCREATE = 0x81,
WM_NCDESTROY = 0x82,
WM_NCHITTEST = 0x84,
WM_NCLBUTTONDBLCLK = 0xa3,
WM_NCLBUTTONDOWN = 0xa1,
WM_NCLBUTTONUP = 0xa2,
WM_NCMBUTTONDBLCLK = 0xa9,
WM_NCMBUTTONDOWN = 0xa7,
WM_NCMBUTTONUP = 0xa8,
WM_NCMOUSEMOVE = 0xa0,
WM_NCPAINT = 0x85,
WM_NCRBUTTONDBLCLK = 0xa6,
WM_NCRBUTTONDOWN = 0xa4,
WM_NCRBUTTONUP = 0xa5,
WM_NEXTDLGCTL = 0x28,
WM_NEXTMENU = 0x213,
WM_NOTIFY = 0x4e,
WM_NOTIFYFORMAT = 0x55,
WM_NULL = 0x0,
WM_PAINT = 0xf,
WM_PAINTCLIPBOARD = 0x309,
WM_PAINTICON = 0x26,
WM_PALETTECHANGED = 0x311,
WM_PALETTEISCHANGING = 0x310,
WM_PARENTNOTIFY = 0x210,
WM_PASTE = 0x302,
WM_PENWINFIRST = 0x380,
WM_PENWINLAST = 0x38f,
WM_POWER = 0x48,
WM_POWERBROADCAST = 0x218,
WM_PRINT = 0x317,
WM_PRINTCLIENT
= 0x318,
WM_QUERYDRAGICON = 0x37,
WM_QUERYENDSESSION = 0x11,
WM_QUERYNEWPALETTE = 0x30f,
WM_QUERYOPEN = 0x13,
WM_QUEUESYNC = 0x23,
WM_QUIT = 0x12,
WM_RBUTTONDBLCLK = 0x206,
WM_RBUTTONDOWN = 0x204,
WM_RBUTTONUP = 0x205,
WM_RENDERALLFORMATS = 0x306,
WM_RENDERFORMAT = 0x305,
WM_SETCURSOR = 0x20,
WM_SETFOCUS = 0x7,
WM_SETFONT = 0x30,
WM_SETHOTKEY = 0x32,
WM_SETICON = 0x80,
WM_SETREDRAW = 0xb,
WM_SETTEXT = 0xc,
WM_SETTINGCHANGE = 0x1a,
WM_SHOWWINDOW = 0x18,
WM_SIZE = 0x5,
WM_SIZECLIPBOARD = 0x30b,
WM_SIZING = 0x214,
WM_SPOOLERSTATUS = 0x2a,
WM_STYLECHANGED = 0x7d,
WM_STYLECHANGING = 0x7c,
WM_SYNCPAINT = 0x88,
WM_SYSCHAR = 0x106,
WM_SYSCOLORCHANGE = 0x15,
WM_SYSCOMMAND = 0x112,
WM_SYSDEADCHAR = 0x107,
WM_SYSKEYDOWN = 0x104,
WM_SYSKEYUP = 0x105,
WM_TCARD = 0x52,
WM_TIMECHANGE = 0x1e,
WM_TIMER = 0x113,
WM_UNDO = 0x304,
WM_UNINITMENUPOPUP = 0x125,
WM_USER = 0x400,
WM_USERCHANGED = 0x54,
WM_VKEYTOITEM = 0x2e,
WM_VSCROLL = 0x115,
WM_VSCROLLCLIPBOARD = 0x30a,
WM_WINDOWPOSCHANGED = 0x47,
WM_WINDOWPOSCHANGING = 0x46,
WM_WININICHANGE = 0x1a,
WM_XBUTTONDBLCLK = 0x20d,
WM_XBUTTONDOWN = 0x20b,
WM_XBUTTONUP = 0x20c
}
[DllImport("accore.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl, EntryPoint = "?acedRegisterFilterWinMsg@@YAHQ6AHPEAUtagMSG@@@Z@Z")]
private static extern int acedRegisterFilterWinMsg(WindowHookProc callBackFunc);
[DllImport("accore.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl, EntryPoint = "?acedRemoveFilterWinMsg@@YAHQ6AHPEAUtagMSG@@@Z@Z")]
private static extern int acedRemoveFilterWinMsg(WindowHookProc callBackFunc);
// hook message filter callback function
private int WindowsHook(ref System.Windows.Forms.Message msg)
{
// if we get a left button double click message
if (msg.Msg == (int)WndMsg.WM_LBUTTONDBLCLK)
{
}
// check to see if we are getting a WM_PAINT message
if (msg.Msg == (int)WndMsg.WM_PAINT)
{
}
// if we are getting a keydown
if (msg.Msg == (int)WndMsg.WM_KEYDOWN && (int)msg.WParam >= 37 && (int)msg.WParam <= 40)
{
// get the editor object
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
switch ((int)msg.WParam)
{
case 37: // left
ed.WriteMessage("\nLeft");
break;
case 38: // up
ed.WriteMessage("\nUp");
break;
case 39: // right
ed.WriteMessage("\nRight");
break;
case 40: // down
ed.WriteMessage("\nDown");
break;
}
return 1; // filter message
}
return 0;
}
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