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Вернуться к списку функций
 Эмуляция нажатия клавиши

 Прислал: VID (Махачкала) ( 19 июня 2002 г. )
©  Автор неизвестен
 Описание:
Функция SendKeys этого юнита, эмулиреут нажатие клавиши для лююого активного приложения
Для активизации приложения ивпользуйте функцию AppActivate

 Зависимости:
SysUtils, Windows, messages

 Ограничения:
Delphi 5, win95/98, win2k

 Исходный текст:
{ **** UBPFD *********** by http://kladovka.net.ru/delphibase/ ****
>> Эмуляция нажатия клавиши

Функция SendKeys этого юнита, эмулиреут нажатие клавиши для лююого активного приложения
Для активизации приложения ивпользуйте функцию AppActivate

Зависимости: SysUtils, Windows, messages
Автор:       VID, vidsnap@mail.ru, ICQ:132234868, Махачкала
Copyright:   Автор неизвестен
Дата:        19 июня 2002 г.
***************************************************************** }

unit SKUnit;

interface

uses SysUtils, Windows, messages;

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


    case SendKeysString[I] 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[I]='}') then begin
                FoundClose:=True;
                Inc(I);
                Break;
              end;
              KeyString:=KeyString+Upcase(SendKeysString[I]);
            end;
            If (Not FoundClose) then begin
               DisplayMessage('No Close');
               Exit;
            end;
            If (SendKeysString[I]='}') 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[I]);
             If (MKey<>INVALIDKEY) then begin
               SendKey(MKey,1,True);
               PopUpShiftKeys;
             end else DisplayMessage('Invalid KeyName');
             Inc(I);
          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;
const
  MAX_WINDOW_NAME_LEN = 80;
var
  WindowName : array[0..MAX_WINDOW_NAME_LEN] of char;
begin
  {Can't test GetWindowText's return value since some windows don't have a title}
  GetWindowText(WHandle,WindowName,MAX_WINDOW_NAME_LEN);
  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);
    end else Result:=false;
  except
    on Exception do Result:=false;
  end;
end;

end.

 Пример использования:
SendKeys('A', False);


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