Delphi的SendKeys函数
2012-10-07 金城 6446
(*
VB中有SendKeys函数
DELPHI中一般用WinAPI (keybd_event,SendInput,PostMessage,SendMessage 等)
Converts a string of characters and key names to keyboard events and
passes them to Windows.
将一组由或字符或键名组成的字符串转换成按键事件交给Windows系统去处理。
Example syntax:用法：
SendKeys( 'abcdefg^{ENTER}', True); // 键入abcdefg[CTRL+回车]
*)
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];
AllocationSize:Integer;
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[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;
end;
Result:=true;
PopUpShiftKeys;
end;