怎样模拟按键(100分)

怎样才能模拟键盘被按下的程序，比如，我运行程序，只要用鼠标选择需要按下的键，一点
就相当于按下某个键！

sendkey()

给你一个例子：
PostMessage(Object.Handle, WM_KEYDOWN, VK_TAB, 0);

////////////////////////////////
unit Unit1;

interface

uses
SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
Forms, Dialogs, StdCtrls;

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure FormKeyPress(Sender: TObject; var Key: Char);
private
AppInst: THandle;
AppWind: THandle;
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.DFM}

uses ShellAPI;


procedure SendShift(H: HWnd; Down: Boolean);
var vKey, ScanCode, wParam: Word;
lParam: longint;
begin
vKey:= $10;
ScanCode:= MapVirtualKey(vKey, 0);
wParam:= vKey or ScanCode shl 8;
lParam:= longint(ScanCode) shl 16 or 1;
if not(Down) then lParam:= lParam or $C0000000;
SendMessage(H, WM_KEYDOWN, vKey, lParam);
end;

procedure SendCtrl(H: HWnd; Down: Boolean);
var vKey, ScanCode, wParam: Word;
lParam: longint;
begin
vKey:= $11;
ScanCode:= MapVirtualKey(vKey, 0);
wParam:= vKey or ScanCode shl 8;
lParam:= longint(ScanCode) shl 16 or 1;
if not(Down) then lParam:= lParam or $C0000000;
SendMessage(H, WM_KEYDOWN, vKey, lParam);
end;

procedure SendKey(H: Hwnd; Key: char);
var vKey, ScanCode, wParam: Word;
lParam, ConvKey: longint;
Shift, Ctrl: boolean;
begin
ConvKey:= OemKeyScan(ord(Key));
Shift:= (ConvKey and $00020000) <> 0;
Ctrl:= (ConvKey and $00040000) <> 0;
ScanCode:= ConvKey and $000000FF or $FF00;
vKey:= ord(Key);
wParam:= vKey;
lParam:= longint(ScanCode) shl 16 or 1;
if Shift then SendShift(H, true);
if Ctrl then SendCtrl(H, true);
SendMessage(H, WM_KEYDOWN, vKey, lParam);
SendMessage(H, WM_CHAR, vKey, lParam);
lParam:= lParam or $C0000000;
SendMessage(H, WM_KEYUP, vKey, lParam);
if Shift then SendShift(H, false);
if Ctrl then SendCtrl(H, false);
end;

function EnumFunc(Handle: HWnd; TF: TForm1): Bool; Far;
begin
TF.AppWind:= 0;
if GetWindowWord(Handle, GWW_HINSTANCE) = TF.AppInst then
TF.AppWind:= Handle;
result:= (TF.AppWind = 0);
end;

procedure TForm1.Button1Click(Sender: TObject);
var Text: Array[0..255] of char;
begin
AppInst:= ShellExecute(Handle, 'open', 'notepad.exe', nil, '', SW_NORMAL);
EnumWindows(@EnumFunc, longint(self));
AppWind:= GetWindow(AppWind, GW_CHILD);
end;


procedure TForm1.Button2Click(Sender: TObject);
begin
SendKey(AppWind, 'T');
SendKey(AppWind, 'e');
SendKey(AppWind, 's');
SendKey(AppWind, 't');
end;

procedure TForm1.FormKeyPress(Sender: TObject; var Key: Char);
begin
if AppWind <> 0 then SendKey(AppWind, Key);
end;

end.
///////////////////////////////////////////////////////////////////////
Ah,这个嘛......正好在《DELPHI新闻组学习笔记》上看到一篇：
How to send [Alt]+[Down]?--------------发出一个Alt+Down 组合键

Re:
Use the keybd_event API function to fake keyboard events. Note that each
key down event needs a matching key up or you mess up the key state array.

keybd_event( VK_MENU, MapVirtualKey( VK_MENU, 0 ), 0 , 0 ); // Alt down
keybd_event( VK_DOWN, MapVirtualKey( VK_DOWN, 0 ), 0 , 0 ); // down arrow key down
keybd_event( VK_DOWN, MapVirtualKey( VK_DOWN, 0 ), KEYEVENTF_KEYUP , 0 ); // down arrow key up
keybd_event( VK_MENU, MapVirtualKey( VK_MENU, 0 ), KEYEVENTF_KEYUP , 0 ); // Alt key up

经本人试验，确实可行，另加补充：
Ctrl: VK_CONTROL
SHIFT:VK_SHIFT
TAB: VK_TAB
'A': byte('A') (98-6-8 22:28)
/////////////////////////////////////////////////////////////
(*
Converts a string of characters and key names to keyboard events and
passes them to Windows.

Example syntax:

SendKeys('abc123{left}{left}{left}def{end}456{left 6}ghi{end}789', True);

*)

Function SendKeys(SendKeysString : PChar; Wait : Boolean) : Boolean;
type
WBytes = array[0..pred(SizeOf(Word))] of Byte;

TSendKey = record
Name : ShortString;
VKey : Byte;
end;

const
{Array of keys that SendKeys recognizes.

If you add to this list, you must be sure to keep it sorted alphabetically
by Name because a binary search routine is used to scan it.}

MaxSendKeyRecs = 41;
SendKeyRecs : array[1..MaxSendKeyRecs] of TSendKey =
(
(Name:'BKSP'; VKey:VK_BACK),
(Name:'BS'; VKey:VK_BACK),
(Name:'BACKSPACE'; VKey:VK_BACK),
(Name:'BREAK'; VKey:VK_CANCEL),
(Name:'CAPSLOCK'; VKey:VK_CAPITAL),
(Name:'CLEAR'; VKey:VK_CLEAR),
(Name:'DEL'; VKey:VK_DELETE),
(Name:'DELETE'; VKey:VK_DELETE),
(Name:'DOWN'; VKey:VK_DOWN),
(Name:'END'; VKey:VK_END),
(Name:'ENTER'; VKey:VK_RETURN),
(Name:'ESC'; VKey:VK_ESCAPE),
(Name:'ESCAPE'; VKey:VK_ESCAPE),
(Name:'F1'; VKey:VK_F1),
(Name:'F10'; VKey:VK_F10),
(Name:'F11'; VKey:VK_F11),
(Name:'F12'; VKey:VK_F12),
(Name:'F13'; VKey:VK_F13),
(Name:'F14'; VKey:VK_F14),
(Name:'F15'; VKey:VK_F15),
(Name:'F16'; VKey:VK_F16),
(Name:'F2'; VKey:VK_F2),
(Name:'F3'; VKey:VK_F3),
(Name:'F4'; VKey:VK_F4),
(Name:'F5'; VKey:VK_F5),
(Name:'F6'; VKey:VK_F6),
(Name:'F7'; VKey:VK_F7),
(Name:'F8'; VKey:VK_F8),
(Name:'F9'; VKey:VK_F9),
(Name:'HELP'; VKey:VK_HELP),
(Name:'HOME'; VKey:VK_HOME),
(Name:'INS'; VKey:VK_INSERT),
(Name:'LEFT'; VKey:VK_LEFT),
(Name:'NUMLOCK'; VKey:VK_NUMLOCK),
(Name:'PGDN'; VKey:VK_NEXT),
(Name:'PGUP'; VKey:VK_PRIOR),
(Name:'PRTSC'; VKey:VK_PRINT),
(Name:'RIGHT'; VKey:VK_RIGHT),
(Name:'SCROLLLOCK'; VKey:VK_SCROLL),
(Name:'TAB'; VKey:VK_TAB),
(Name:'UP'; VKey:VK_UP)
);

{Extra VK constants missing from Delphi's Windows API interface}
VK_NULL=0;
VK_SemiColon=186;
VK_Equal=187;
VK_Comma=188;
VK_Minus=189;
VK_Period=190;
VK_Slash=191;
VK_BackQuote=192;
VK_LeftBracket=219;
VK_BackSlash=220;
VK_RightBracket=221;
VK_Quote=222;
VK_Last=VK_Quote;

ExtendedVKeys : set of byte =
[VK_Up,
VK_Down,
VK_Left,
VK_Right,
VK_Home,
VK_End,
VK_Prior, {PgUp}
VK_Next, {PgDn}
VK_Insert,
VK_Delete];

const
INVALIDKEY = $FFFF {Unsigned -1};
VKKEYSCANSHIFTON = $01;
VKKEYSCANCTRLON = $02;
VKKEYSCANALTON = $04;
UNITNAME = 'SendKeys';
var
UsingParens, ShiftDown, ControlDown, AltDown, FoundClose : Boolean;
PosSpace : Byte;
I, L : Integer;
NumTimes, MKey : Word;
KeyString : String[20];

procedure DisplayMessage(Message : PChar);
begin
MessageBox(0,Message,UNITNAME,0);
end;

function BitSet(BitTable, BitMask : Byte) : Boolean;
begin
Result:=ByteBool(BitTable and BitMask);
end;

procedure SetBit(var BitTable : Byte; BitMask : Byte);
begin
BitTable:=BitTable or Bitmask;
end;

Procedure KeyboardEvent(VKey, ScanCode : Byte; Flags : Longint);
var
KeyboardMsg : TMsg;
begin
keybd_event(VKey, ScanCode, Flags,0);
If (Wait) then While (PeekMessage(KeyboardMsg,0,WM_KEYFIRST, WM_KEYLAST, PM_REMOVE)) do begin
TranslateMessage(KeyboardMsg);
DispatchMessage(KeyboardMsg);
end;
end;

Procedure SendKeyDown(VKey: Byte; NumTimes : Word; GenUpMsg : Boolean);
var
Cnt : Word;
ScanCode : Byte;
NumState : Boolean;
KeyBoardState : TKeyboardState;
begin
If (VKey=VK_NUMLOCK) then begin
NumState:=ByteBool(GetKeyState(VK_NUMLOCK) and 1);
GetKeyBoardState(KeyBoardState);
If NumState then KeyBoardState[VK_NUMLOCK]:=(KeyBoardState[VK_NUMLOCK] and not 1)
else KeyBoardState[VK_NUMLOCK]:=(KeyBoardState[VK_NUMLOCK] or 1);
SetKeyBoardState(KeyBoardState);
exit;
end;

ScanCode:=Lo(MapVirtualKey(VKey,0));
For Cnt:=1 to NumTimes do
If (VKey in ExtendedVKeys)then begin
KeyboardEvent(VKey, ScanCode, KEYEVENTF_EXTENDEDKEY);
If (GenUpMsg) then
KeyboardEvent(VKey, ScanCode, KEYEVENTF_EXTENDEDKEY or KEYEVENTF_KEYUP)
end else begin
KeyboardEvent(VKey, ScanCode, 0);
If (GenUpMsg) then KeyboardEvent(VKey, ScanCode, KEYEVENTF_KEYUP);
end;
end;

Procedure SendKeyUp(VKey: Byte);
var
ScanCode : Byte;
begin
ScanCode:=Lo(MapVirtualKey(VKey,0));
If (VKey in ExtendedVKeys)then
KeyboardEvent(VKey, ScanCode, KEYEVENTF_EXTENDEDKEY and KEYEVENTF_KEYUP)
else KeyboardEvent(VKey, ScanCode, KEYEVENTF_KEYUP);
end;

Procedure SendKey(MKey: Word; NumTimes : Word; GenDownMsg : Boolean);
begin
If (BitSet(Hi(MKey),VKKEYSCANSHIFTON)) then SendKeyDown(VK_SHIFT,1,False);
If (BitSet(Hi(MKey),VKKEYSCANCTRLON)) then SendKeyDown(VK_CONTROL,1,False);
If (BitSet(Hi(MKey),VKKEYSCANALTON)) then SendKeyDown(VK_MENU,1,False);
SendKeyDown(Lo(MKey), NumTimes, GenDownMsg);
If (BitSet(Hi(MKey),VKKEYSCANSHIFTON)) then SendKeyUp(VK_SHIFT);
If (BitSet(Hi(MKey),VKKEYSCANCTRLON)) then SendKeyUp(VK_CONTROL);
If (BitSet(Hi(MKey),VKKEYSCANALTON)) then SendKeyUp(VK_MENU);
end;

{Implements a simple binary search to locate special key name strings}

Function StringToVKey(KeyString : ShortString) : Word;
var
Found, Collided : Boolean;
Bottom, Top, Middle : Byte;
begin
Result:=INVALIDKEY;
Bottom:=1;
Top:=MaxSendKeyRecs;
Found:=false;
Middle:=(Bottom+Top) div 2;
Repeat
Collided:=((Bottom=Middle) or (Top=Middle));
If (KeyString=SendKeyRecs[Middle].Name) then begin
Found:=True;
Result:=SendKeyRecs[Middle].VKey;
end else begin
If (KeyString>SendKeyRecs[Middle].Name) then Bottom:=Middle
else Top:=Middle;
Middle:=(Succ(Bottom+Top)) div 2;
end;
Until (Found or Collided);
If (Result=INVALIDKEY) then DisplayMessage('Invalid Key Name');
end;

procedure PopUpShiftKeys;
begin
If (not UsingParens) then begin
If ShiftDown then SendKeyUp(VK_SHIFT);
If ControlDown then SendKeyUp(VK_CONTROL);
If AltDown then SendKeyUp(VK_MENU);
ShiftDown:=false;
ControlDown:=false;
AltDown:=false;
end;
end;

begin
AllocationSize:=MaxInt;
Result:=false;
UsingParens:=false;
ShiftDown:=false;
ControlDown:=false;
AltDown:=false;
I:=0;
L:=StrLen(SendKeysString);
If (L>AllocationSize) then L:=AllocationSize;
If (L=0) then Exit;

While (I<L) do begin
case SendKeysString of
'(' : begin
UsingParens:=True;
Inc(I);
end;
')' : begin
UsingParens:=False;
PopUpShiftKeys;
Inc(I);
end;
'%' : begin
AltDown:=True;
SendKeyDown(VK_MENU,1,False);
Inc(I);
end;
'+' : begin
ShiftDown:=True;
SendKeyDown(VK_SHIFT,1,False);
Inc(I);
end;
'^' : begin
ControlDown:=True;
SendKeyDown(VK_CONTROL,1,False);
Inc(I);
end;
'{' : begin
NumTimes:=1;
If (SendKeysString[Succ(I)]='{') then begin
MKey:=VK_LEFTBRACKET;
SetBit(Wbytes(MKey)[1],VKKEYSCANSHIFTON);
SendKey(MKey,1,True);
PopUpShiftKeys;
Inc(I,3);
Continue;
end;
KeyString:='';
FoundClose:=False;
While (I<=L) do begin
Inc(I);
If (SendKeysString='}') then begin
FoundClose:=True;
Inc(I);
Break;
end;
KeyString:=KeyString+Upcase(SendKeysString);
end;
If (Not FoundClose) then begin
DisplayMessage('No Close');
Exit;
end;
If (SendKeysString='}') then begin
MKey:=VK_RIGHTBRACKET;
SetBit(Wbytes(MKey)[1],VKKEYSCANSHIFTON);
SendKey(MKey,1,True);
PopUpShiftKeys;
Inc(I);
Continue;
end;
PosSpace:=Pos(' ',KeyString);
If (PosSpace<>0) then begin
NumTimes:=StrToInt(Copy(KeyString,Succ(PosSpace),Length(KeyString)-PosSpace));
KeyString:=Copy(KeyString,1,Pred(PosSpace));
end;
If (Length(KeyString)=1) then MKey:=vkKeyScan(KeyString[1])
else MKey:=StringToVKey(KeyString);
If (MKey<>INVALIDKEY) then begin
SendKey(MKey,NumTimes,True);
PopUpShiftKeys;
Continue;
end;
end;
'~' : begin
SendKeyDown(VK_RETURN,1,True);
PopUpShiftKeys;
Inc(I);
end;
else begin
MKey:=vkKeyScan(SendKeysString);
If (MKey<>INVALIDKEY) then begin
SendKey(MKey,1,True);
PopUpShiftKeys;
end else DisplayMessage('Invalid KeyName');
Inc(I);
end;
end;
end;
Result:=true;
PopUpShiftKeys;
end;

请参考
keybd_event（BYTE bVk，BYTE bScan，DWORD dwFlags，DWORD dwExtralnfo）；
如:按下Ctrl即
keybd_event(VK_Control, 0, 0, 0 );
如:按上Ctrl即
keybd_event(VK_Control, 0, KEYEVENTF_KEYUP , 0 );
其它也一样.

sendmessage( handle,WM_KEYDOW,YourKey,0);
or
postmessage( handle,WM_KEYDOW,YourKey,0);

sendkey
不是库函数吧，

我贴：
(*
SendKeys routine for 32-bit Delphi.

Written by Ken Henderson

Copyright (c) 1995 Ken Henderson

This unit includes two routines that simulate popular Visual Basic
routines: Sendkeys and AppActivate. SendKeys takes a PChar
as its first parameter and a boolean as its second, like so:

SendKeys('KeyString', Wait);

where KeyString is a string of key names and modifiers that you want
to send to the current input focus and Wait is a boolean variable or value
that indicates whether SendKeys should wait for each key message to be
processed before proceeding. See the table below for more information.

AppActivate also takes a PChar as its only parameter, like so:

AppActivate('WindowName');

where WindowName is the name of the window that you want to make the
current input focus.

SendKeys supports the Visual Basic SendKeys syntax, as documented below.

Supported modifiers:

+ = Shift
^ = Control
% = Alt

Surround sequences of characters or key names with parentheses in order to
modify them as a group. For example, '+abc' shifts only 'a', while '+(abc)' shifts
all three characters.

Supported special characters

~ = Enter
( = Begin modifier group (see above)
) = End modifier group (see above)
{ = Begin key name text (see below)
} = End key name text (see below)

Supported characters:

Any character that can be typed is supported. Surround the modifier keys
listed above with braces in order to send as normal text.

Supported key names (surround these with braces):

BKSP, BS, BACKSPACE
BREAK
CAPSLOCK
CLEAR
DEL
DELETE
DOWN
END
ENTER
ESC
ESCAPE
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
F13
F14
F15
F16
HELP
HOME
INS
LEFT
NUMLOCK
PGDN
PGUP
PRTSC
RIGHT
SCROLLLOCK
TAB
UP

Follow the keyname with a space and a number to send the specified key a
given number of times (e.g., {left 6}).
*)

unit sndkey32;

interface

Uses SysUtils, Windows, Messages;

Function SendKeys(SendKeysString : PChar; Wait : Boolean) : Boolean;
function AppActivate(WindowName : PChar) : boolean;

{Buffer for working with PChar's}

const
WorkBufLen = 40;
var
WorkBuf : array[0..WorkBufLen] of Char;

implementation
type
THKeys = array[0..pred(MaxLongInt)] of byte;
var
AllocationSize : integer;

(*
Converts a string of characters and key names to keyboard events and
passes them to Windows.

Example syntax:

SendKeys('abc123{left}{left}{left}def{end}456{left 6}ghi{end}789', True);

*)

Function SendKeys(SendKeysString : PChar; Wait : Boolean) : Boolean;
type
WBytes = array[0..pred(SizeOf(Word))] of Byte;

TSendKey = record
Name : ShortString;
VKey : Byte;
end;

const
{Array of keys that SendKeys recognizes.

If you add to this list, you must be sure to keep it sorted alphabetically
by Name because a binary search routine is used to scan it.}

MaxSendKeyRecs = 41;
SendKeyRecs : array[1..MaxSendKeyRecs] of TSendKey =
(
(Name:'BACKSPACE'; VKey:VK_BACK),
(Name:'BKSP'; VKey:VK_BACK),
(Name:'BREAK'; VKey:VK_CANCEL),
(Name:'BS'; VKey:VK_BACK),
(Name:'CAPSLOCK'; VKey:VK_CAPITAL),
(Name:'CLEAR'; VKey:VK_CLEAR),
(Name:'DEL'; VKey:VK_DELETE),
(Name:'DELETE'; VKey:VK_DELETE),
(Name:'DOWN'; VKey:VK_DOWN),
(Name:'END'; VKey:VK_END),
(Name:'ENTER'; VKey:VK_RETURN),
(Name:'ESC'; VKey:VK_ESCAPE),
(Name:'ESCAPE'; VKey:VK_ESCAPE),
(Name:'F1'; VKey:VK_F1),
(Name:'F10'; VKey:VK_F10),
(Name:'F11'; VKey:VK_F11),
(Name:'F12'; VKey:VK_F12),
(Name:'F13'; VKey:VK_F13),
(Name:'F14'; VKey:VK_F14),
(Name:'F15'; VKey:VK_F15),
(Name:'F16'; VKey:VK_F16),
(Name:'F2'; VKey:VK_F2),
(Name:'F3'; VKey:VK_F3),
(Name:'F4'; VKey:VK_F4),
(Name:'F5'; VKey:VK_F5),
(Name:'F6'; VKey:VK_F6),
(Name:'F7'; VKey:VK_F7),
(Name:'F8'; VKey:VK_F8),
(Name:'F9'; VKey:VK_F9),
(Name:'HELP'; VKey:VK_HELP),
(Name:'HOME'; VKey:VK_HOME),
(Name:'INS'; VKey:VK_INSERT),
(Name:'LEFT'; VKey:VK_LEFT),
(Name:'NUMLOCK'; VKey:VK_NUMLOCK),
(Name:'PGDN'; VKey:VK_NEXT),
(Name:'PGUP'; VKey:VK_PRIOR),
(Name:'PRTSC'; VKey:VK_PRINT),
(Name:'RIGHT'; VKey:VK_RIGHT),
(Name:'SCROLLLOCK'; VKey:VK_SCROLL),
(Name:'TAB'; VKey:VK_TAB),
(Name:'UP'; VKey:VK_UP)
);

{Extra VK constants missing from Delphi's Windows API interface}
VK_NULL=0;
VK_SemiColon=186;
VK_Equal=187;
VK_Comma=188;
VK_Minus=189;
VK_Period=190;
VK_Slash=191;
VK_BackQuote=192;
VK_LeftBracket=219;
VK_BackSlash=220;
VK_RightBracket=221;
VK_Quote=222;
VK_Last=VK_Quote;

ExtendedVKeys : set of byte =
[VK_Up,
VK_Down,
VK_Left,
VK_Right,
VK_Home,
VK_End,
VK_Prior, {PgUp}
VK_Next, {PgDn}
VK_Insert,
VK_Delete];

const
INVALIDKEY = $FFFF {Unsigned -1};
VKKEYSCANSHIFTON = $01;
VKKEYSCANCTRLON = $02;
VKKEYSCANALTON = $04;
UNITNAME = 'SendKeys';
var
UsingParens, ShiftDown, ControlDown, AltDown, FoundClose : Boolean;
PosSpace : Byte;
I, L : Integer;
NumTimes, MKey : Word;
KeyString : String[20];

procedure DisplayMessage(Message : PChar);
begin
MessageBox(0,Message,UNITNAME,0);
end;

function BitSet(BitTable, BitMask : Byte) : Boolean;
begin
Result:=ByteBool(BitTable and BitMask);
end;

procedure SetBit(var BitTable : Byte; BitMask : Byte);
begin
BitTable:=BitTable or Bitmask;
end;

Procedure KeyboardEvent(VKey, ScanCode : Byte; Flags : Longint);
var
KeyboardMsg : TMsg;
begin
keybd_event(VKey, ScanCode, Flags,0);
If (Wait) then While (PeekMessage(KeyboardMsg,0,WM_KEYFIRST, WM_KEYLAST, PM_REMOVE)) do begin
TranslateMessage(KeyboardMsg);
DispatchMessage(KeyboardMsg);
end;
end;

Procedure SendKeyDown(VKey: Byte; NumTimes : Word; GenUpMsg : Boolean);
var
Cnt : Word;
ScanCode : Byte;
NumState : Boolean;
KeyBoardState : TKeyboardState;
begin
If (VKey=VK_NUMLOCK) then begin
NumState:=ByteBool(GetKeyState(VK_NUMLOCK) and 1);
GetKeyBoardState(KeyBoardState);
If NumState then KeyBoardState[VK_NUMLOCK]:=(KeyBoardState[VK_NUMLOCK] and not 1)
else KeyBoardState[VK_NUMLOCK]:=(KeyBoardState[VK_NUMLOCK] or 1);
SetKeyBoardState(KeyBoardState);
exit;
end;

ScanCode:=Lo(MapVirtualKey(VKey,0));
For Cnt:=1 to NumTimes do
If (VKey in ExtendedVKeys)then begin
KeyboardEvent(VKey, ScanCode, KEYEVENTF_EXTENDEDKEY);
If (GenUpMsg) then
KeyboardEvent(VKey, ScanCode, KEYEVENTF_EXTENDEDKEY or KEYEVENTF_KEYUP)
end else begin
KeyboardEvent(VKey, ScanCode, 0);
If (GenUpMsg) then KeyboardEvent(VKey, ScanCode, KEYEVENTF_KEYUP);
end;
end;

Procedure SendKeyUp(VKey: Byte);
var
ScanCode : Byte;
begin
ScanCode:=Lo(MapVirtualKey(VKey,0));
If (VKey in ExtendedVKeys)then
KeyboardEvent(VKey, ScanCode, KEYEVENTF_EXTENDEDKEY and KEYEVENTF_KEYUP)
else KeyboardEvent(VKey, ScanCode, KEYEVENTF_KEYUP);
end;

Procedure SendKey(MKey: Word; NumTimes : Word; GenDownMsg : Boolean);
begin
If (BitSet(Hi(MKey),VKKEYSCANSHIFTON)) then SendKeyDown(VK_SHIFT,1,False);
If (BitSet(Hi(MKey),VKKEYSCANCTRLON)) then SendKeyDown(VK_CONTROL,1,False);
If (BitSet(Hi(MKey),VKKEYSCANALTON)) then SendKeyDown(VK_MENU,1,False);
SendKeyDown(Lo(MKey), NumTimes, GenDownMsg);
If (BitSet(Hi(MKey),VKKEYSCANSHIFTON)) then SendKeyUp(VK_SHIFT);
If (BitSet(Hi(MKey),VKKEYSCANCTRLON)) then SendKeyUp(VK_CONTROL);
If (BitSet(Hi(MKey),VKKEYSCANALTON)) then SendKeyUp(VK_MENU);
end;

{Implements a simple binary search to locate special key name strings}

Function StringToVKey(KeyString : ShortString) : Word;
var
Found, Collided : Boolean;
Bottom, Top, Middle : Byte;
begin
Result:=INVALIDKEY;
Bottom:=1;
Top:=MaxSendKeyRecs;
Found:=false;
Middle:=(Bottom+Top) div 2;
Repeat
Collided:=((Bottom=Middle) or (Top=Middle));
If (KeyString=SendKeyRecs[Middle].Name) then begin
Found:=True;
Result:=SendKeyRecs[Middle].VKey;
end else begin
If (KeyString>SendKeyRecs[Middle].Name) then Bottom:=Middle
else Top:=Middle;
Middle:=(Succ(Bottom+Top)) div 2;
end;
Until (Found or Collided);
If (Result=INVALIDKEY) then DisplayMessage('Invalid Key Name');
end;

procedure PopUpShiftKeys;
begin
If (not UsingParens) then begin
If ShiftDown then SendKeyUp(VK_SHIFT);
If ControlDown then SendKeyUp(VK_CONTROL);
If AltDown then SendKeyUp(VK_MENU);
ShiftDown:=false;
ControlDown:=false;
AltDown:=false;
end;
end;

begin
AllocationSize:=MaxInt;
Result:=false;
UsingParens:=false;
ShiftDown:=false;
ControlDown:=false;
AltDown:=false;
I:=0;
L:=StrLen(SendKeysString);
If (L>AllocationSize) then L:=AllocationSize;
If (L=0) then Exit;

While (I<L) do begin
case SendKeysString of
'(' : begin
UsingParens:=True;
Inc(I);
end;
')' : begin
UsingParens:=False;
PopUpShiftKeys;
Inc(I);
end;
'%' : begin
AltDown:=True;
SendKeyDown(VK_MENU,1,False);
Inc(I);
end;
'+' : begin
ShiftDown:=True;
SendKeyDown(VK_SHIFT,1,False);
Inc(I);
end;
'^' : begin
ControlDown:=True;
SendKeyDown(VK_CONTROL,1,False);
Inc(I);
end;
'{' : begin
NumTimes:=1;
If (SendKeysString[Succ(I)]='{') then begin
MKey:=VK_LEFTBRACKET;
SetBit(Wbytes(MKey)[1],VKKEYSCANSHIFTON);
SendKey(MKey,1,True);
PopUpShiftKeys;
Inc(I,3);
Continue;
end;
KeyString:='';
FoundClose:=False;
While (I<=L) do begin
Inc(I);
If (SendKeysString='}') then begin
FoundClose:=True;
Inc(I);
Break;
end;
KeyString:=KeyString+Upcase(SendKeysString);
end;
If (Not FoundClose) then begin
DisplayMessage('No Close');
Exit;
end;
If (SendKeysString='}') then begin
MKey:=VK_RIGHTBRACKET;
SetBit(Wbytes(MKey)[1],VKKEYSCANSHIFTON);
SendKey(MKey,1,True);
PopUpShiftKeys;
Inc(I);
Continue;
end;
PosSpace:=Pos(' ',KeyString);
If (PosSpace<>0) then begin
NumTimes:=StrToInt(Copy(KeyString,Succ(PosSpace),Length(KeyString)-PosSpace));
KeyString:=Copy(KeyString,1,Pred(PosSpace));
end;
If (Length(KeyString)=1) then MKey:=vkKeyScan(KeyString[1])
else MKey:=StringToVKey(KeyString);
If (MKey<>INVALIDKEY) then begin
SendKey(MKey,NumTimes,True);
PopUpShiftKeys;
Continue;
end;
end;
'~' : begin
SendKeyDown(VK_RETURN,1,True);
PopUpShiftKeys;
Inc(I);
end;
else begin
MKey:=vkKeyScan(SendKeysString);
If (MKey<>INVALIDKEY) then begin
SendKey(MKey,1,True);
PopUpShiftKeys;
end else DisplayMessage('Invalid KeyName');
Inc(I);
end;
end;
end;
Result:=true;
PopUpShiftKeys;
end;

{AppActivate

This is used to set the current input focus to a given window using its
name. This is especially useful for ensuring a window is active before
sending it input messages using the SendKeys function. You can specify
a window's name in its entirety, or only portion of it, beginning from
the left.

}


var
WindowHandle : HWND;

function EnumWindowsProc(WHandle: HWND; lParam: LPARAM): BOOL; export; stdcall;
var
WindowName : array[0..MAX_PATH] of char;
begin
{Can't test GetWindowText's return value since some windows don't have a title}
GetWindowText(WHandle,WindowName,MAX_PATH);
Result := (StrLIComp(WindowName,PChar(lParam), StrLen(PChar(lParam))) <> 0);
If (not Result) then WindowHandle:=WHandle;
end;

function AppActivate(WindowName : PChar) : boolean;
begin
try
Result:=true;
WindowHandle:=FindWindow(nil,WindowName);
If (WindowHandle=0) then EnumWindows(@EnumWindowsProc,Integer(PChar(WindowName)));
If (WindowHandle<>0) then begin
SendMessage(WindowHandle, WM_SYSCOMMAND, SC_HOTKEY, WindowHandle);
SendMessage(WindowHandle, WM_SYSCOMMAND, SC_RESTORE, WindowHandle);
SetForegroundWindow(WindowHandle);
end else Result:=false;
except
on Exception do Result:=false;
end;
end;

end.

请参考:
http://www.delphibbs.com/delphibbs/dispq.asp?lid=767927
里面分数最高的.

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