一、结果
keydown:用户在键盘上按下某按键时发生。一直按着某按键则会不断触发。
keypress:用户按下一个ASCII字符按键,产生一个字符时发生(不含shift、alt、ctrl)。一直按着某按键则会不断触发。
keyup:用户释放某一个按键是触发。
二、事件触发顺序
keydown、keypress、keyup
Shift 是一个集合变量。
type TShiftState = set of (ssShift, ssAlt, ssCtrl, ssLeft, ssRight, ssMiddle, ssDouble);
也就是说TShiftstate类型有ssShift, ssAlt, ssCtrl, ssLeft(鼠标左键), ssRight(鼠标右键), ssMiddle(鼠标中键), ssDouble (鼠标双击)
Value Meaning
ssShift The Shift key is held down.
ssAlt The Alt key is held down.
ssCtrl The Ctrl key is held down.
ssLeft The left mouse button is held down.
ssRight The right mouse button is held down.
ssMiddle The middle mouse button is held down.
ssDouble The mouse was double-clicked.
用来判断组合键中是否用shift、Ctrl、鼠标左键、右键、中键、双击事件。
Delphi中一些常用的组合键值
CTRL+A:#1 CTRL+B:#2 CTRL+C:#3 CTRL+D:#4 CTRL+E:#5 CTRL+F:#6 CTRL+G:#7
CTRL+H:#8 CTRL+I:#9 CTRL+J:#10 CTRL+K:#11 CTRL+L:#12 CR:#13 CTRL+N:#14
CTRL+O:#15 CTRL+P:#16 CTRL+Q:#17 CTRL+R:#18 CTRL+S:#19 CTRL+T:#20
CTRL+U:#21 CTRL+V:#22 CTRL+W:#23 CTRL+X:#24 CTRL+Y:#25 CTRL+Z:#26 ESC:#27
CTRL+:#28 CTRL+]:#29 SHIFT+CTRL+-:#30 DEL:#127
一般用在keydown、keyup、keypress事件中。
OnKeyDown和OnKeyUp事件中的Key是Word型的,表示用户按的是键盘上的哪个键,OnKeyPress中的Key是Char型,表示用户输入什么字符。一个产生8位(char)常规健值,一个产生16位(word)功能健健值。
1.KeyPress主要用来捕获数字(注意:包括Shift+数字的符号)、字母(注意:包括大小写)、小键盘等除了F1-12、SHIFT、Alt、Ctrl、Insert、Home、PgUp、Delete、End、PgDn、ScrollLock、Pause、NumLock、{菜单键}、{开始键}和方向键外的ANSI字符,KeyDown和KeyUp 通常可以捕获键盘除了PrScrn所有按键(这里不讨论特殊键盘的特殊键)
2.KeyPress 只能捕获单个字符
KeyDown 和KeyUp 可以捕获组合键。
3.KeyPress 可以捕获单个字符的大小写
4.KeyDown和KeyUp 对于单个字符捕获的KeyValue 都是一个值,也就是不能判断单个字符的大小写。
5.KeyPress 不区分小键盘和主键盘的数字字符。
KeyDown 和KeyUp 区分小键盘和主键盘的数字字符。
6.其中PrScrn 按键KeyPress、KeyDown和KeyUp 都不能捕获。
keydown是键盘按下任何键
keypress是键盘按下任何数字键和任何字母键
keydown 与keypress的声明格式差别很大
1 onkeydown事件
type TKeyEvent = procedure (Sender: TObject; var Key: Word; Shift: TShiftState) of object;
property OnKeyDown: TKeyEvent;
该事件在有任何键按下的时候,就发生。看!它响应的是Word类型,还能识别Shift键状态
2 onkeypress事件
type TKeyPressEvent = procedure (Sender: TObject; var Key: Char) of object;
property OnKeyPress: TKeyPressEvent;
该事件响应的是字符类型Char,只能识别ASCII码,不能识别组合键和控制键和功能键。按下功能键、控制键不产生该事件,但产生OnkeyDown事件。
TWinControl与键盘相关的3个事件如下:
OnKeyDown:键按下
OnKeyPress:有Ascii字符产生
OnKeyUp:键放开
其中OnKeyDown、OnKeyUp对任何按键都有响应,传入参数为
var Key: Word 键的扫描值
Shift: TShiftState 表示控制键状态,包括键盘上的Ctrl、Shift、Alt和鼠标的左、中、右键及双击。
OnKeyPress事件只对Ascii有响应,传入参数为
var Key: Char Ascii字符
//例如F1-F10只有onKeydown有反应
另外TWincontrol. KeyPreview:Boolean属性确定控件是否在子控件之前处理按键。
比如说enter键,
onkeypress事件
if key=#13 then //当你按下enter键时触发该事件
do something
onkeydown事件
if key=13 then //当你按下enter键时触发该事件
do something
其中所有的KeyDown事件里面应该用如下判断:
if Key = VK_RETURN then
...
所有的KeyPress事件里面应该用如下判断:
if Key = #13 then
...
postmessage(self.handle,wm_keydown,vk_tab,0);
keybd_event(VK_TAB,2,0,0);
perform(WM_NEXTDLGCTL,0,0);
SelectNext(ActiveControl, True, True);
...
但是显然用回车代码TAB显然不适合于BUTTON,你在它上面按回车的时候它会执行OnClick,所以不会TAB,你可以用别的键代替回车。
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键值
在keydown事件里面
showmessage(inttostr(key));
在keypress事件里面
showmessage(key);
就知道了。
Form1.KeyPreview := True;
procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
Showmessage(IntToStr(Key));
end;
procedure TForm1.FormKeyPress(Sender: TObject; var Key: Char);
begin
Showmessage(IntToStr(Ord(Key)));
end;
{ Virtual Keys, Standard Set }
{$EXTERNALSYM VK_LBUTTON}
VK_LBUTTON = 1;
{$EXTERNALSYM VK_RBUTTON}
VK_RBUTTON = 2;
{$EXTERNALSYM VK_CANCEL}
VK_CANCEL = 3;
{$EXTERNALSYM VK_MBUTTON}
VK_MBUTTON = 4; { NOT contiguous with L & RBUTTON }
{$EXTERNALSYM VK_BACK}
VK_BACK = 8;
{$EXTERNALSYM VK_TAB}
VK_TAB = 9;
{$EXTERNALSYM VK_CLEAR}
VK_CLEAR = 12;
{$EXTERNALSYM VK_RETURN}
VK_RETURN = 13;
{$EXTERNALSYM VK_SHIFT}
VK_SHIFT = $10;
{$EXTERNALSYM VK_CONTROL}
VK_COnTROL= 17;
{$EXTERNALSYM VK_MENU}
VK_MENU = 18;
{$EXTERNALSYM VK_PAUSE}
VK_PAUSE = 19;
{$EXTERNALSYM VK_CAPITAL}
VK_CAPITAL = 20;
{$EXTERNALSYM VK_KANA }
VK_KANA = 21;
{$EXTERNALSYM VK_HANGUL }
VK_HANGUL = 21;
{$EXTERNALSYM VK_JUNJA }
VK_JUNJA = 23;
{$EXTERNALSYM VK_FINAL }
VK_FINAL = 24;
{$EXTERNALSYM VK_HANJA }
VK_HANJA = 25;
{$EXTERNALSYM VK_KANJI }
VK_KANJI = 25;
{$EXTERNALSYM VK_CONVERT }
VK_COnVERT= 28;
{$EXTERNALSYM VK_NONCONVERT }
VK_NOnCONVERT= 29;
{$EXTERNALSYM VK_ACCEPT }
VK_ACCEPT = 30;
{$EXTERNALSYM VK_MODECHANGE }
VK_MODECHANGE = 31;
{$EXTERNALSYM VK_ESCAPE}
VK_ESCAPE = 27;
{$EXTERNALSYM VK_SPACE}
VK_SPACE = $20;
{$EXTERNALSYM VK_PRIOR}
VK_PRIOR = 33;
{$EXTERNALSYM VK_NEXT}
VK_NEXT = 34;
{$EXTERNALSYM VK_END}
VK_END = 35;
{$EXTERNALSYM VK_HOME}
VK_HOME = 36;
{$EXTERNALSYM VK_LEFT}
VK_LEFT = 37;
{$EXTERNALSYM VK_UP}
VK_UP = 38;
{$EXTERNALSYM VK_RIGHT}
VK_RIGHT = 39;
{$EXTERNALSYM VK_DOWN}
VK_DOWN = 40;
{$EXTERNALSYM VK_SELECT}
VK_SELECT = 41;
{$EXTERNALSYM VK_PRINT}
VK_PRINT = 42;
{$EXTERNALSYM VK_EXECUTE}
VK_EXECUTE = 43;
{$EXTERNALSYM VK_SNAPSHOT}
VK_SNAPSHOT = 44;
{$EXTERNALSYM VK_INSERT}
VK_INSERT = 45;
{$EXTERNALSYM VK_DELETE}
VK_DELETE = 46;
{$EXTERNALSYM VK_HELP}
VK_HELP = 47;
{ VK_0 thru VK_9 are the same as ASCII ’0’ thru ’9’ ($30 - $39) }
{ VK_A thru VK_Z are the same as ASCII ’A’ thru ’Z’ ($41 - $5A) }
{$EXTERNALSYM VK_LWIN}
VK_LWIN = 91;
{$EXTERNALSYM VK_RWIN}
VK_RWIN = 92;
{$EXTERNALSYM VK_APPS}
VK_APPS = 93;
{$EXTERNALSYM VK_NUMPAD0}
VK_NUMPAD0 = 96;
{$EXTERNALSYM VK_NUMPAD1}
VK_NUMPAD1 = 97;
{$EXTERNALSYM VK_NUMPAD2}
VK_NUMPAD2 = 98;
{$EXTERNALSYM VK_NUMPAD3}
VK_NUMPAD3 = 99;
{$EXTERNALSYM VK_NUMPAD4}
VK_NUMPAD4 = 100;
{$EXTERNALSYM VK_NUMPAD5}
VK_NUMPAD5 = 101;
{$EXTERNALSYM VK_NUMPAD6}
VK_NUMPAD6 = 102;
{$EXTERNALSYM VK_NUMPAD7}
VK_NUMPAD7 = 103;
{$EXTERNALSYM VK_NUMPAD8}
VK_NUMPAD8 = 104;
{$EXTERNALSYM VK_NUMPAD9}
VK_NUMPAD9 = 105;
{$EXTERNALSYM VK_MULTIPLY}
VK_MULTIPLY = 106;
{$EXTERNALSYM VK_ADD}
VK_ADD = 107;
{$EXTERNALSYM VK_SEPARATOR}
VK_SEPARATOR = 108;
{$EXTERNALSYM VK_SUBTRACT}
VK_SUBTRACT = 109;
{$EXTERNALSYM VK_DECIMAL}
VK_DECIMAL = 110;
{$EXTERNALSYM VK_DIVIDE}
VK_DIVIDE = 111;
{$EXTERNALSYM VK_F1}
VK_F1 = 112;
{$EXTERNALSYM VK_F2}
VK_F2 = 113;
{$EXTERNALSYM VK_F3}
VK_F3 = 114;
{$EXTERNALSYM VK_F4}
VK_F4 = 115;
{$EXTERNALSYM VK_F5}
VK_F5 = 116;
{$EXTERNALSYM VK_F6}
VK_F6 = 117;
{$EXTERNALSYM VK_F7}
VK_F7 = 118;
{$EXTERNALSYM VK_F8}
VK_F8 = 119;
{$EXTERNALSYM VK_F9}
VK_F9 = 120;
{$EXTERNALSYM VK_F10}
VK_F10 = 121;
{$EXTERNALSYM VK_F11}
VK_F11 = 122;
{$EXTERNALSYM VK_F12}
VK_F12 = 123;
{$EXTERNALSYM VK_F13}
VK_F13 = 124;
{$EXTERNALSYM VK_F14}
VK_F14 = 125;
{$EXTERNALSYM VK_F15}
VK_F15 = 126;
{$EXTERNALSYM VK_F16}
VK_F16 = 127;
{$EXTERNALSYM VK_F17}
VK_F17 = 128;
{$EXTERNALSYM VK_F18}
VK_F18 = 129;
{$EXTERNALSYM VK_F19}
VK_F19 = 130;
{$EXTERNALSYM VK_F20}
VK_F20 = 131;
{$EXTERNALSYM VK_F21}
VK_F21 = 132;
{$EXTERNALSYM VK_F22}
VK_F22 = 133;
{$EXTERNALSYM VK_F23}
VK_F23 = 134;
{$EXTERNALSYM VK_F24}
VK_F24 = 135;
{$EXTERNALSYM VK_NUMLOCK}
VK_NUMLOCK = 144;
{$EXTERNALSYM VK_SCROLL}
VK_SCROLL = 145;
{ VK_L & VK_R - left and right Alt, Ctrl and Shift virtual keys.
Used only as parameters to GetAsyncKeyState() and GetKeyState().
No other API or message will distinguish left and right keys in this way. }
{$EXTERNALSYM VK_LSHIFT}
VK_LSHIFT = 160;
{$EXTERNALSYM VK_RSHIFT}
VK_RSHIFT = 161;
{$EXTERNALSYM VK_LCONTROL}
VK_LCOnTROL= 162;
{$EXTERNALSYM VK_RCONTROL}
VK_RCOnTROL= 163;
{$EXTERNALSYM VK_LMENU}
VK_LMENU = 164;
{$EXTERNALSYM VK_RMENU}
VK_RMENU = 165;
{$EXTERNALSYM VK_PROCESSKEY}
VK_PROCESSKEY = 229;
{$EXTERNALSYM VK_ATTN}
VK_ATTN = 246;
{$EXTERNALSYM VK_CRSEL}
VK_CRSEL = 247;
{$EXTERNALSYM VK_EXSEL}
VK_EXSEL = 248;
{$EXTERNALSYM VK_EREOF}
VK_EREOF = 249;
{$EXTERNALSYM VK_PLAY}
VK_PLAY = 250;
{$EXTERNALSYM VK_ZOOM}
VK_ZOOM = 251;
{$EXTERNALSYM VK_NONAME}
VK_NOnAME= 252;
{$EXTERNALSYM VK_PA1}
VK_PA1 = 253;
{$EXTERNALSYM VK_OEM_CLEAR}
VK_OEM_CLEAR = 254;
:),其实不用记,你不是用delphi吗,在ide里面输入vk_f1总会吧,然后按住ctrl键
单击刚才你输入的vk_f1,就会出来啦!
至于key:char的值,就是key:word的ascII码,你可以看chr(vk_f1),chr(vk_enter),都可以哈!
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delphi帮助里的虚拟键值表:
vk_right right arrow key
vk_down down arrow key
vk_select select key
vk_print print key (keyboard-specific)
vk_execute execute key
vk_snapshot print screen key
vk_insert insert key
vk_delete delete key
vk_help help key
vk_lwin left windows key (microsoft keyboard)
vk_rwin right windows key (microsoft keyboard)
vk_apps applications key (microsoft keyboard)
vk_numpad0 0 key (numeric keypad)
vk_numpad1 1 key (numeric keypad)
vk_numpad2 2 key (numeric keypad)
vk_numpad3 3 key (numeric keypad)
vk_numpad4 4 key (numeric keypad)
vk_numpad5 5 key (numeric keypad)
vk_numpad6 6 key (numeric keypad)
vk_numpad7 7 key (numeric keypad)
vk_numpad8 8 key (numeric keypad)
vk_numpad9 9 key (numeric keypad)
vk_multiply multiply key (numeric keypad)
vk_add add key (numeric keypad)
vk_separator separator key (numeric keypad)
vk_subtract subtract key (numeric keypad)
vk_decimal decimal key (numeric keypad)
vk_divide divide key (numeric keypad)
vk_f1 f1 key
vk_f2 f2 key
vk_f3 f3 key
vk_f4 f4 key
vk_f5 f5 key
vk_f6 f6 key
vk_f7 f7 key
vk_f8 f8 key
vk_f9 f9 key
vk_f10 f10 key
vk_f11 f11 key
vk_f12 f12 key
vk_f13 f13 key
vk_f14 f14 key
vk_f15 f15 key
vk_f16 f16 key
vk_f17 f17 key
vk_f18 f18 key
vk_f19 f19 key
vk_f20 f20 key
vk_f21 f21 key
vk_f22 f22 key
vk_f23 f23 key
vk_f24 f24 key
vk_numlock num lock key
vk_scroll scroll lock key
vk_lshift left shift key (only used with getasynckeystate and getkeystate)
vk_rshift right shift key (only used with getasynckeystate and getkeystate)
vk_lcontrol left ctrl key (only used with getasynckeystate and getkeystate)
vk_rcontrol right ctrl key (only used with getasynckeystate and getkeystate)
vk_lmenu left alt key (only used with getasynckeystate and getkeystate)
vk_rmenu right alt key (only used with getasynckeystate and getkeystate)
vk_processkey process key
vk_attn attn key
vk_crsel crsel key
vk_exsel exsel key
vk_ereof erase eof key
vk_play play key
vk_zoom zoom key
vk_noname reserved for future use
vk_pa1 pa1 key
vk_oem_clear clear key
模拟鼠标
鼠标移动(移动量dx,dy)
mouse_event(MOUSEEVENTF_MOVE,dx,dy,0, 0 );
鼠标在(x,y)处按下或释放
setcursorpos(x,y);
mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0 );
mouse_event(MOUSEEVENTF_RIGHTDOWN, 0, 0, 0, 0 );
mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0 );
mouse_event(MOUSEEVENTF_RIGHTUP, 0, 0, 0, 0 );
鼠标双击由两次按下与释放来模拟
键盘模拟
一般虚拟键值(VK_)由KeyDown或keyup事件得到
特殊键值
Tab--9
Shift--16
Ctrl--17
Alt--18
CapsLock--20
Esc--27
Win--91,92
NumLock--144
ScrollLock--145
按下键
keybd_event(key, MapVirtualKey(key, 0 ), KEYEVENTF_KEYUP , 0 );
释放键
keybd_event(key, MapVirtualKey(key, 0 ), 0 , 0 );
以上做法对大多数键有效,少数键要用到不同的值
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常数名称 十六进制值 十进制值 对应按键
VK_LBUTTON 01 1 鼠标的左键
VK_RBUTTON 02 2 鼠标的右键
VK-CANCEL 03 3 Ctrl+Break(通常不需要处理)
VK_MBUTTON 04 4 鼠标的中键(三按键鼠标)
VK_BACK 08 8 Backspace键
VK_TAB 09 9 Tab键
VK_CLEAR 0C 12 Clear键(Num Lock关闭时的数字键盘5)
VK_RETURN 0D 13 Enter键
VK_SHIFT 10 16 Shift键
VK_CONTROL 11 17 Ctrl键
VK_MENU 12 18 Alt键
VK_PAUSE 13 19 Pause键
VK_CAPITAL 14 20 Caps Lock键
VK_ESCAPE 1B 27 Ese键
VK_SPACE 20 32 Spacebar键
VK_PRIOR 21 33 Page Up键
VK_NEXT 22 34 Page Domw键
VK_END 23 35 End键
VK_HOME 24 36 Home键
VK_LEFT 25 37 LEFT ARROW 键(←)
VK_UP 26 38 UP ARROW键(↑)
VK_RIGHT 27 39 RIGHT ARROW键(→)
VK_DOWN 28 40 DOWN ARROW键(↓)
VK_Select 29 41 Select键
VK_PRINT 2A 42
VK_EXECUTE 2B 43 EXECUTE键
VK_SNAPSHOT 2C 44 Print Screen键(抓屏)
VK_Insert 2D 45 Ins键(Num Lock关闭时的数字键盘0)
VK_Delete 2E 46 Del键(Num Lock关闭时的数字键盘.)
VK_HELP 2F 47 Help键
VK_0 30 48 0键
VK_1 31 49 1键
VK_2 32 50 2键
VK_3 33 51 3键
VK_4 34 52 4键
VK_5 35 53 5键
VK_6 36 54 6键
VK_7 37 55 7键
VK_8 38 56 8键
VK_9 39 57 9键
VK_A 41 65 A键
VK_B 42 66 B键
VK_C 43 67 C键
VK_D 44 68 D键
VK_E 45 69 E键
VK_F 46 70 F键
VK_G 47 71 G键
VK_H 48 72 H键
VK_I 49 73 I键
VK_J 4A 74 J键
VK_K 4B 75 K键
VK_L 4C 76 L键
VK_M 4D 77 M键
VK_N 4E 78 N键
VK_O 4F 79 O键
VK_P 50 80 P键
VK_Q 51 81 Q键
VK_R 52 82 R键
VK_S 53 83 S键
VK_T 54 84 T键
VK_U 55 85 U键
VK_V 56 86 V键
VK_W 57 87 W键
VK_X 58 88 X键
VK_Y 59 89 Y键
VK_Z 5A 90 Z键
VK_NUMPAD0 60 96 数字键0键
VK_NUMPAD1 61 97 数字键1键
VK_NUMPAD2 62 98 数字键2键
VK_NUMPAD3 62 99 数字键3键
VK_NUMPAD4 64 100 数字键4键
VK_NUMPAD5 65 101 数字键5键
VK_NUMPAD6 66 102 数字键6键
VK_NUMPAD7 67 103 数字键7键
VK_NUMPAD8 68 104 数字键8键
VK_NUMPAD9 69 105 数字键9键
VK_MULTIPLY 6A 106 数字键盘上的*键
VK_ADD 6B 107 数字键盘上的+键
VK_SEPARATOR 6C 108 Separator键
VK_SUBTRACT 6D 109 数字键盘上的-键
VK_DECIMAL 6E 110 数字键盘上的.键
VK_DIVIDE 6F 111 数字键盘上的/键
VK_F1 70 112 F1键
VK_F2 71 113 F2键
VK_F3 72 114 F3键
VK_F4 73 115 F4键
VK_F5 74 116 F5键
VK_F6 75 117 F6键
VK_F7 76 118 F7键
VK_F8 77 119 F8键
VK_F9 78 120 F9键
VK_F10 79 121 F10键
VK_F11 7A 122 F11键
VK_F12 7B 123 F12键
VK_NUMLOCK 90 144 Num Lock 键
VK_SCROLL 91 145 Scroll Lock键
上面没有提到的:(都在大键盘)
VK_LWIN 91 左win键
VK_RWIN 92 右win键
VK_APPS 93 右Ctrl左边键,点击相当于点击鼠标右键,会弹出快捷菜单
186 ;(分号)
187 =键
188 ,键(逗号)
189 -键(减号)
190 .键(句号)
191 /键
192 `键(Esc下面)
219 [键
220 /键
221 ]键
222 '键(引号)
procedure TForm1.Edit1KeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
if key=VK_DELETE then
key:=0;
end;
Delphi6.0,2000下通过Top
于在keydown中屏蔽掉除数字外的所有键
还应该允许Ctr+C/X/V,所以总结起来应该是:
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
if not (Key in ['0'..'9', #3, #22, #24, #8, #13, #45]) then Key := #0;
end;
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
if (key>#57) and (key<#48) then
key:=#0;
end;
我想你最好将你的例程写出来。
如果是像CKEN阁下说的那样,你要将按键事件屏蔽的话,实际上应该是直接赋值:
Key:=0;
(注意不是Key:=#0,因为这里的Key是Word类型,在keypress事件中,key的值是Char型,就要用“#”)
Good luck
在KeyDown里面就可以实现
if key=vk_numpad0 then (如果为小键盘的0键就干你想干的事情)
下面是小键盘的值
VK_NUMPAD0 0 key (numeric keypad)
VK_NUMPAD1 1 key (numeric keypad)
VK_NUMPAD2 2 key (numeric keypad)
VK_NUMPAD3 3 key (numeric keypad)
VK_NUMPAD4 4 key (numeric keypad)
VK_NUMPAD5 5 key (numeric keypad)
VK_NUMPAD6 6 key (numeric keypad)
VK_NUMPAD7 7 key (numeric keypad)
VK_NUMPAD8 8 key (numeric keypad)
VK_NUMPAD9 9 key (numeric keypad)
VK_MULTIPLY Multiply key (numeric keypad)
VK_ADD Add key (numeric keypad)
VK_SEPARATOR Separator key (numeric keypad)
VK_SUBTRACT Subtract key (numeric keypad)
VK_DECIMAL Decimal key (numeric keypad) VK_DIVIDE Divide key (numeric keypad)