Contributor: SWAG SUPPORT TEAM
Here is the poor man's version:
procedure keybd_Event; far; external 'USER' index 289;
procedure PostVKey(bVirtKey: byte; Up: Boolean);
var
AXReg,BXReg : Word;
AXHigh, AXLow, BXHigh, BXLow : Byte;
function MakeWord(L,H: Byte): Word;
begin
MakeWord := (H shl 8) + L;
end;
begin
AXLow := bVirtKey;
if up then AXHigh := $80 else AXHigh := $0;
AXreg := MakeWord(AXLow,AXHigh);
BXLow := VkKeyScan(bVirtKey);
BXHigh := 0;
BXReg := MakeWord(BXLow,BXHigh);
asm
mov bx,BXreg;
mov ax,AXReg;
end;
Keybd_Event;
end;
then to simulate Shift+Ins you need:-
PostVKey(VK_Shift,false);
PostVKey(VK_Insert,false);
PostVKey(VK_Insert,True);
PostVKey(VK_Shift,True);
Here is the Rolls-Royce version:
Note: This is commercial and copyrighted code. The source code may not be sold for profit
(unless Steve is doing the selling).
{This unit is to be included in the app that you are running.}
unit SKeys;
interface
type
{ Return values for SendKeys function }
TSendKeyError = (sk_None, sk_FailSetHook, sk_InvalidToken, sk_UnknownError);
function SendKeys(S: String): TSendKeyError;
implementation
function SendKeys; external 'SendKey' index 2;
end.
(********************************************)
{Here is the DLL that is used.}
library SendKey;
uses
SysUtils, WinTypes, WinProcs, Messages, Classes, KeyDefs;
type
{ Error codes }
TSendKeyError = (sk_None, sk_FailSetHook, sk_InvalidToken, sk_UnknownError);
{ exceptions }
ESendKeyError = class(Exception);
ESetHookError = class(ESendKeyError);
EInvalidToken = class(ESendKeyError);
{ a TList descendant that know how to dispose of its contents }
TMessageList = class(TList)
public
destructor Destroy; override;
end;
destructor TMessageList.Destroy;
var
i: longint;
begin
{ deallocate all the message records before discarding the list }
for i := 0 to Count - 1 do
Dispose(PEventMsg(Items[i]));
inherited Destroy;
end;
var
{ variables global to the DLL }
MsgCount: word;
MessageBuffer: TEventMsg;
HookHandle: hHook;
Playing: Boolean;
MessageList: TMessageList;
AltPressed, ControlPressed, ShiftPressed: Boolean;
NextSpecialKey: TKeyString;
function MakeWord(L, H: Byte): Word;
{ macro creates a word from low and high bytes }
inline(
$5A/ { pop dx }
$58/ { pop ax }
$8A/$E2); { mov ah, dl }
procedure StopPlayback;
{ Unhook the hook, and clean up }
begin
{ if Hook is currently active, then unplug it }
if Playing then
UnhookWindowsHookEx(HookHandle);
MessageList.Free;
Playing := False;
end;
function Play(Code: integer; wParam: word; lParam: Longint): Longint; export;
{ This is the JournalPlayback callback function. It is called by Windows }
{ when Windows polls for hardware events. The code parameter indicates what }
{ to do. }
begin
case Code of
hc_Skip: begin
{ hc_Skip means to pull the next message out of our list. If we }
{ are at the end of the list, it's okay to unhook the JournalPlayback }
{ hook from here. }
{ increment message counter }
inc(MsgCount);
{ check to see if all messages have been played }
if MsgCount >= MessageList.Count then
StopPlayback
else
{ copy next message from list into buffer }
MessageBuffer := TEventMsg(MessageList.Items[MsgCount]^);
Result := 0;
end;
hc_GetNext: begin
{ hc_GetNext means to fill the wParam and lParam with the proper }
{ values so that the message can be played back. DO NOT unhook }
{ hook from within here. Return value indicates how much time until }
{ Windows should playback message. We'll return 0 so that it's }
{ processed right away. }
{ move message in buffer to message queue }
PEventMsg(lParam)^ := MessageBuffer;
Result := 0 { process immediately }
end
else
{ if Code isn't hc_Skip or hc_GetNext, then call next hook in chain }
Result := CallNextHookEx(HookHandle, Code, wParam, lParam);
end;
end;
procedure StartPlayback;
{ Initializes globals and sets the hook }
begin
{ grab first message from list and place in buffer in case we }
{ get a hc_GetNext before and hc_Skip }
MessageBuffer := TEventMsg(MessageList.Items[0]^);
{ initialize message count and play indicator }
MsgCount := 0;
{ initialize Alt, Control, and Shift key flags }
AltPressed := False;
ControlPressed := False;
ShiftPressed := False;
{ set the hook! }
HookHandle := SetWindowsHookEx(wh_JournalPlayback, Play, hInstance, 0);
if HookHandle = 0 then
raise ESetHookError.Create('Couldn''t set hook')
else
Playing := True;
end;
procedure MakeMessage(vKey: byte; M: word);
{ procedure builds a TEventMsg record that emulates a keystroke and }
{ adds it to message list }
var
E: PEventMsg;
begin
New(E); { allocate a message record }
with E^ do begin
Message := M; { set message field }
{ high byte of ParamL is the vk code, low byte is the scan code }
ParamL := MakeWord(vKey, MapVirtualKey(vKey, 0));
ParamH := 1; { repeat count is 1 }
Time := GetTickCount; { set time }
end;
MessageList.Add(E);
end;
procedure KeyDown(vKey: byte);
{ Generates KeyDownMessage }
begin
{ don't generate a "sys" key if the control key is pressed (Windows quirk) }
if (AltPressed and (not ControlPressed) and (vKey in [Ord('A')..Ord('Z')])) or
(vKey = vk_Menu) then
MakeMessage(vKey, wm_SysKeyDown)
else
MakeMessage(vKey, wm_KeyDown);
end;
procedure KeyUp(vKey: byte);
{ Generates KeyUp message }
begin
{ don't generate a "sys" key if the control key is pressed (Windows quirk) }
if AltPressed and (not ControlPressed) and (vKey in [Ord('A')..Ord('Z')]) then
MakeMessage(vKey, wm_SysKeyUp)
else
MakeMessage(vKey, wm_KeyUp);
end;
procedure SimKeyPresses(VKeyCode: Word);
{ This function simulates keypresses for the given key, taking into }
{ account the current state of Alt, Control, and Shift keys }
begin
{ press Alt key if flag has been set }
if AltPressed then
KeyDown(vk_Menu);
{ press Control key if flag has been set }
if ControlPressed then
KeyDown(vk_Control);
{ if shift is pressed, or shifted key and control is not pressed... }
if (((Hi(VKeyCode) and 1) <> 0) and (not ControlPressed)) or ShiftPressed then
KeyDown(vk_Shift); { ...press shift }
KeyDown(Lo(VKeyCode)); { press key down }
KeyUp(Lo(VKeyCode)); { release key }
{ if shift is pressed, or shifted key and control is not pressed... }
if (((Hi(VKeyCode) and 1) <> 0) and (not ControlPressed)) or ShiftPressed then
KeyUp(vk_Shift); { ...release shift }
{ if shift flag is set, reset flag }
if ShiftPressed then begin
ShiftPressed := False;
end;
{ Release Control key if flag has been set, reset flag }
if ControlPressed then begin
KeyUp(vk_Control);
ControlPressed := False;
end;
{ Release Alt key if flag has been set, reset flag }
if AltPressed then begin
KeyUp(vk_Menu);
AltPressed := False;
end;
end;
procedure ProcessKey(S: String);
{ This function parses each character in the string to create the message list }
var
KeyCode: word;
Key: byte;
index: integer;
Token: TKeyString;
begin
index := 1;
repeat
case S[index] of
KeyGroupOpen : begin
{ It's the beginning of a special token! }
Token := '';
inc(index);
while S[index] <> KeyGroupClose do begin
{ add to Token until the end token symbol is encountered }
Token := Token + S[index];
inc(index);
{ check to make sure the token's not too long }
if (Length(Token) = 7) and (S[index] <> KeyGroupClose) then
raise EInvalidToken.Create('No closing brace');
end;
{ look for token in array, Key parameter will }
{ contain vk code if successful }
if not FindKeyInArray(Token, Key) then
raise EInvalidToken.Create('Invalid token');
{ simulate keypress sequence }
SimKeyPresses(MakeWord(Key, 0));
end;
AltKey : begin
{ set Alt flag }
AltPressed := True;
end;
ControlKey : begin
{ set Control flag }
ControlPressed := True;
end;
ShiftKey : begin
{ set Shift flag }
ShiftPressed := True;
end;
else begin
{ A normal character was pressed }
{ convert character into a word where the high byte contains }
{ the shift state and the low byte contains the vk code }
KeyCode := vkKeyScan(MakeWord(Byte(S[index]), 0));
{ simulate keypress sequence }
SimKeyPresses(KeyCode);
end;
end;
inc(index);
until index > Length(S);
end;
function SendKeys(S: String): TSendKeyError; export;
{ This is the one entry point. Based on the string passed in the S }
{ parameter, this function creates a list of keyup/keydown messages, }
{ sets a JournalPlayback hook, and replays the keystroke messages. }
var
i: byte;
begin
try
Result := sk_None; { assume success }
MessageList := TMessageList.Create; { create list of messages }
ProcessKey(S); { create messages from string }
StartPlayback; { set hook and play back messages }
except
{ if an exception occurs, return an error code, and clean up }
on E:ESendKeyError do begin
MessageList.Free;
if E is ESetHookError then
Result := sk_FailSetHook
else if E is EInvalidToken then
Result := sk_InvalidToken;
end
else
{ Catch-all exception handler ensures than an exception }
{ doesn't walk up into application stack }
Result := sk_UnknownError;
end;
end;
exports
SendKeys index 2;
begin
end.
(********************************************)
unit Keydefs;
interface
uses WinTypes;
const
MaxKeys = 24;
ControlKey = '^';
AltKey = '@';
ShiftKey = '~';
KeyGroupOpen = '{';
KeyGroupClose = '}';
type
TKeyString = String[7];
TKeyDef = record
Key: TKeyString;
vkCode: Byte;
end;
const
KeyDefArray : array[1..MaxKeys] of TKeyDef = (
(Key: 'F1'; vkCode: vk_F1),
(Key: 'F2'; vkCode: vk_F2),
(Key: 'F3'; vkCode: vk_F3),
(Key: 'F4'; vkCode: vk_F4),
(Key: 'F5'; vkCode: vk_F5),
(Key: 'F6'; vkCode: vk_F6),
(Key: 'F7'; vkCode: vk_F7),
(Key: 'F8'; vkCode: vk_F8),
(Key: 'F9'; vkCode: vk_F9),
(Key: 'F10'; vkCode: vk_F10),
(Key: 'F11'; vkCode: vk_F11),
(Key: 'F12'; vkCode: vk_F12),
(Key: 'INSERT'; vkCode: vk_Insert),
(Key: 'DELETE'; vkCode: vk_Delete),
(Key: 'HOME'; vkCode: vk_Home),
(Key: 'END'; vkCode: vk_End),
(Key: 'PGUP'; vkCode: vk_Prior),
(Key: 'PGDN'; vkCode: vk_Next),
(Key: 'TAB'; vkCode: vk_Tab),
(Key: 'ENTER'; vkCode: vk_Return),
(Key: 'BKSP'; vkCode: vk_Back),
(Key: 'PRTSC'; vkCode: vk_SnapShot),
(Key: 'SHIFT'; vkCode: vk_Shift),
(Key: 'ESCAPE'; vkCode: vk_Escape));
function FindKeyInArray(Key: TKeyString; var Code: Byte): Boolean;
implementation
uses SysUtils;
function FindKeyInArray(Key: TKeyString; var Code: Byte): Boolean;
{ function searches array for token passed in Key, and returns the }
{ virtual key code in Code. }
var
i: word;
begin
Result := False;
for i := Low(KeyDefArray) to High(KeyDefArray) do
if UpperCase(Key) = KeyDefArray[i].Key then begin
Code := KeyDefArray[i].vkCode;
Result := True;
Break;
end;
end;
end.