Shift 是一個集合變量。
type TShiftState = set of (ssShift, ssAlt, ssCtrl, ssLeft, ssRight, ssMiddle, ssDouble);
也就是說TShiftstate類型有ssShift, ssAlt, ssCtrl, ssLeft（鼠標左鍵）, ssRight（鼠標右鍵）, ssMiddle（鼠標中鍵）, ssDouble (鼠標雙擊)
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.
用來判斷組合鍵中是否用shift、Ctrl、鼠標左鍵、右鍵、中鍵、雙擊事件。
Delphi中一些常用的組合鍵值
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，表示用戶按的是鍵盤上的哪個鍵，OnKeyPress中的Key是Char型，表示用戶輸入什么字符。一個產生8位(char)常規健值，一個產生16位(word)功能健健值。
1.KeyPress主要用來捕獲數字(注意：包括Shift+數字的符號)、字母（注意：包括大小寫）、小鍵盤等除了F1-12、SHIFT、Alt、 Ctrl、Insert、Home、PgUp、Delete、End、PgDn、ScrollLock、Pause、NumLock、{菜單鍵}、{開始 鍵}和方向鍵外的ANSI字符，KeyDown和KeyUp 通常可以捕獲鍵盤除了PrScrn所有按鍵(這里不討論特殊鍵盤的特殊鍵）
2.KeyPress 只能捕獲單個字符
KeyDown 和KeyUp 可以捕獲組合鍵。
3.KeyPress 可以捕獲單個字符的大小寫
4.KeyDown和KeyUp 對於單個字符捕獲的KeyValue 都是一個值，也就是不能判斷單個字符的大小寫。
5.KeyPress 不區分小鍵盤和主鍵盤的數字字符。
KeyDown 和KeyUp 區分小鍵盤和主鍵盤的數字字符。
6.其中PrScrn 按鍵KeyPress、KeyDown和KeyUp 都不能捕獲。
keydown是鍵盤按下任何鍵
keypress是鍵盤按下任何數字鍵和任何字母鍵
keydown 與keypress的聲明格式差別很大
1 onkeydown事件
type TKeyEvent = procedure (Sender: TObject; var Key: Word; Shift: TShiftState) of object;
property OnKeyDown: TKeyEvent;
該事件在有任何鍵按下的時候，就發生。看！它響應的是Word類型，還能識別Shift鍵狀態
2 onkeypress事件
type TKeyPressEvent = procedure (Sender: TObject; var Key: Char) of object;
property OnKeyPress: TKeyPressEvent;
該事件響應的是字符類型Char，只能識別ASCII碼，不能識別組合鍵和控制鍵和功能鍵。按下功能鍵、控制鍵不產生該事件，但產生OnkeyDown事件。
TWinControl與鍵盤相關的3個事件如下：
OnKeyDown：鍵按下
OnKeyPress：有Ascii字符產生
OnKeyUp：鍵放開
其中OnKeyDown、OnKeyUp對任何按鍵都有響應，傳入參數為
var Key: Word 鍵的掃描值
Shift: TShiftState 表示控制鍵狀態，包括鍵盤上的Ctrl、Shift、Alt和鼠標的左、中、右鍵及雙擊。
OnKeyPress事件只對Ascii有響應，傳入參數為
var Key: Char Ascii字符
//例如F1-F10只有onKeydown有反應
另外TWincontrol. KeyPreview:Boolean屬性確定控件是否在子控件之前處理按鍵。
比如說enter鍵,
onkeypress事件
if key=#13 then //當你按下enter鍵時觸發該事件
do something
onkeydown事件
if key=13 then //當你按下enter鍵時觸發該事件
do something
其中所有的KeyDown事件里面應該用如下判斷：
if Key = VK_RETURN then
...
所有的KeyPress事件里面應該用如下判斷：
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);
...
但是顯然用回車代碼TAB顯然不適合於BUTTON，你在它上面按回車的時候它會執行OnClick，所以不會TAB，你可以用別的鍵代替回車。
》》》》》》》》》》
鍵值
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;
：），其實不用記，你不是用delphi嗎，在ide里面輸入vk_f1總會吧，然后按住ctrl鍵
單擊剛才你輸入的vk_f1，就會出來啦！
至於key:char的值，就是key:word的ascII碼，你可以看chr(vk_f1),chr(vk_enter),都可以哈！
》》》》》》》》》》》》》》》》》》
delphi幫助里的虛擬鍵值表:
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
模擬鼠標
鼠標移動(移動量dx,dy)
mouse_event(MOUSEEVENTF_MOVE,dx,dy,0, 0 );
鼠標在(x,y)處按下或釋放
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 );
鼠標雙擊由兩次按下與釋放來模擬
鍵盤模擬
一般虛擬鍵值(VK_)由KeyDown或keyup事件得到
特殊鍵值
Tab--9
Shift--16
Ctrl--17
Alt--18
CapsLock--20
Esc--27
Win--91,92
NumLock--144
ScrollLock--145
按下鍵
keybd_event(key, MapVirtualKey(key, 0 ), KEYEVENTF_KEYUP , 0 );
釋放鍵
keybd_event(key, MapVirtualKey(key, 0 ), 0 , 0 );
以上做法對大多數鍵有效，少數鍵要用到不同的值
》》》》》》》》》》》》》》》》》》》》》》》》》
常數名稱 十六進制值 十進制值 對應按鍵
VK_LBUTTON 01 1 鼠標的左鍵
VK_RBUTTON 02 2 鼠標的右鍵
VK-CANCEL 03 3 Ctrl+Break(通常不需要處理)
VK_MBUTTON 04 4 鼠標的中鍵（三按鍵鼠標)
VK_BACK 08 8 Backspace鍵
VK_TAB 09 9 Tab鍵
VK_CLEAR 0C 12 Clear鍵（Num Lock關閉時的數字鍵盤5）
VK_RETURN 0D 13 Enter鍵
VK_SHIFT 10 16 Shift鍵
VK_CONTROL 11 17 Ctrl鍵
VK_MENU 12 18 Alt鍵
VK_PAUSE 13 19 Pause鍵
VK_CAPITAL 14 20 Caps Lock鍵
VK_ESCAPE 1B 27 Ese鍵
VK_SPACE 20 32 Spacebar鍵
VK_PRIOR 21 33 Page Up鍵
VK_NEXT 22 34 Page Domw鍵
VK_END 23 35 End鍵
VK_HOME 24 36 Home鍵
VK_LEFT 25 37 LEFT ARROW 鍵(←)
VK_UP 26 38 UP ARROW鍵(↑)
VK_RIGHT 27 39 RIGHT ARROW鍵(→)
VK_DOWN 28 40 DOWN ARROW鍵(↓)
VK_Select 29 41 Select鍵
VK_PRINT 2A 42
VK_EXECUTE 2B 43 EXECUTE鍵
VK_SNAPSHOT 2C 44 Print Screen鍵（抓屏）
VK_Insert 2D 45 Ins鍵(Num Lock關閉時的數字鍵盤0)
VK_Delete 2E 46 Del鍵(Num Lock關閉時的數字鍵盤.)
VK_HELP 2F 47 Help鍵
VK_0 30 48 0鍵
VK_1 31 49 1鍵
VK_2 32 50 2鍵
VK_3 33 51 3鍵
VK_4 34 52 4鍵
VK_5 35 53 5鍵
VK_6 36 54 6鍵
VK_7 37 55 7鍵
VK_8 38 56 8鍵
VK_9 39 57 9鍵
VK_A 41 65 A鍵
VK_B 42 66 B鍵
VK_C 43 67 C鍵
VK_D 44 68 D鍵
VK_E 45 69 E鍵
VK_F 46 70 F鍵
VK_G 47 71 G鍵
VK_H 48 72 H鍵
VK_I 49 73 I鍵
VK_J 4A 74 J鍵
VK_K 4B 75 K鍵
VK_L 4C 76 L鍵
VK_M 4D 77 M鍵
VK_N 4E 78 N鍵
VK_O 4F 79 O鍵
VK_P 50 80 P鍵
VK_Q 51 81 Q鍵
VK_R 52 82 R鍵
VK_S 53 83 S鍵
VK_T 54 84 T鍵
VK_U 55 85 U鍵
VK_V 56 86 V鍵
VK_W 57 87 W鍵
VK_X 58 88 X鍵
VK_Y 59 89 Y鍵
VK_Z 5A 90 Z鍵
VK_NUMPAD0 60 96 數字鍵0鍵
VK_NUMPAD1 61 97 數字鍵1鍵
VK_NUMPAD2 62 98 數字鍵2鍵
VK_NUMPAD3 62 99 數字鍵3鍵
VK_NUMPAD4 64 100 數字鍵4鍵
VK_NUMPAD5 65 101 數字鍵5鍵
VK_NUMPAD6 66 102 數字鍵6鍵
VK_NUMPAD7 67 103 數字鍵7鍵
VK_NUMPAD8 68 104 數字鍵8鍵
VK_NUMPAD9 69 105 數字鍵9鍵
VK_MULTIPLY 6A 106 數字鍵盤上的*鍵
VK_ADD 6B 107 數字鍵盤上的+鍵
VK_SEPARATOR 6C 108 Separator鍵
VK_SUBTRACT 6D 109 數字鍵盤上的-鍵
VK_DECIMAL 6E 110 數字鍵盤上的.鍵
VK_DIVIDE 6F 111 數字鍵盤上的/鍵
VK_F1 70 112 F1鍵
VK_F2 71 113 F2鍵
VK_F3 72 114 F3鍵
VK_F4 73 115 F4鍵
VK_F5 74 116 F5鍵
VK_F6 75 117 F6鍵
VK_F7 76 118 F7鍵
VK_F8 77 119 F8鍵
VK_F9 78 120 F9鍵
VK_F10 79 121 F10鍵
VK_F11 7A 122 F11鍵
VK_F12 7B 123 F12鍵
VK_NUMLOCK 90 144 Num Lock 鍵
VK_SCROLL 91 145 Scroll Lock鍵
上面沒有提到的：（都在大鍵盤）
VK_LWIN 91 左win鍵
VK_RWIN 92 右win鍵
VK_APPS 93 右Ctrl左邊鍵，點擊相當於點擊鼠標右鍵，會彈出快捷菜單
186 ;(分號)
187 =鍵
188 ,鍵(逗號)
189 -鍵(減號)
190 .鍵(句號)
191 /鍵
192 `鍵(Esc下面)
219 [鍵
220 /鍵
221 ]鍵
222 '鍵(引號)
procedure TForm1.Edit1KeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
if key=VK_DELETE then
key:=0;
end;
Delphi6.0,2000下通過Top
於在keydown中屏蔽掉除數字外的所有鍵
還應該允許Ctr+C/X/V，所以總結起來應該是：
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