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sending keys to another application...

Posted on 2002-05-12
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Last Modified: 2010-04-04
Hi guys,

I want to send keys to another application. Not only characters or strings, I want to send Ctrl-left arrow, Ctrl-Right arrow, Ctrrl-Shift whatever...

Any clues?

best regards,
Manuel López (lopem)
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Question by:lopem
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10 Comments
 
LVL 5

Expert Comment

by:alanwhincup
ID: 7004878
Have a look at this example:

http://www.swissdelphicenter.ch/en/showcode.php?id=220

I've used this function and find it works very well.

Cheers,

Alan
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LVL 2

Expert Comment

by:Tasomia
ID: 7004879
Hi,

There's a function from P. Below at:
http://www.swissdelphicenter.ch/en/showcode.php?id=220
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Expert Comment

by:Tasomia
ID: 7004885
alanwhincup, you were faster...
0
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LVL 3

Author Comment

by:lopem
ID: 7004987
I tried the code of the page you sent me (see code below)... But it didnt work. I previously load an instance of Notepad and nothing. No keys sent. Am I doing something wrong? Whta about using Word or Excel? What I have to ask in the findwindow function? WinWord? WinExcel? Word? Excel?

thanks in advance...
Manuel Lopez (lopem)

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}


{****************************************************}
{ Postkey function with HWND }

procedure PostKeyExHWND(hWindow: HWnd; key: Word; const shift: TShiftState;
                           specialkey: Boolean);
type
  TBuffers = array [0..1] of TKeyboardState;
var
  pKeyBuffers: ^TBuffers;
  lParam: LongInt;
begin
  (* check if the target window exists *)
  if IsWindow(hWindow) then
  begin
    (* set local variables to default values *)
    pKeyBuffers := nil;
    lParam := MakeLong(0, MapVirtualKey(key, 0));

    (* modify lparam if special key requested *)
    if specialkey then
      lParam := lParam or $1000000;

  (* allocate space for the key state buffers *)
  New(pKeyBuffers);
  try
    (* Fill buffer 1 with current state so we can later restore it.
    Null out buffer 0 to get a "no key pressed" state. *)
    GetKeyboardState(pKeyBuffers^[1]);
    FillChar(pKeyBuffers^[0], SizeOf(TKeyboardState), 0);
    (* set the requested modifier keys to "down" state in the buffer*)
    if ssShift in shift then
      pKeyBuffers^[0][VK_SHIFT] := $80;
    if ssAlt in shift then
    begin
      (* Alt needs special treatment since a bit in lparam needs also be set *)
      pKeyBuffers^[0][VK_MENU] := $80;
      lParam := lParam or $20000000;
    end;
    if ssCtrl in shift then
      pKeyBuffers^[0][VK_CONTROL] := $80;
    if ssLeft in shift then
      pKeyBuffers^[0][VK_LBUTTON] := $80;
    if ssRight in shift then
      pKeyBuffers^[0][VK_RBUTTON] := $80;
    if ssMiddle in shift then
      pKeyBuffers^[0][VK_MBUTTON] := $80;

    (* make out new key state array the active key state map *)
    SetKeyboardState(pKeyBuffers^[0]);
    (* post the key messages *)
    if ssAlt in Shift then
    begin
      PostMessage(hWindow, WM_SYSKEYDOWN, key, lParam);
      PostMessage(hWindow, WM_SYSKEYUP, key, lParam or $C0000000);
    end
    else
    begin
      PostMessage(hWindow, WM_KEYDOWN, key, lParam);
      PostMessage(hWindow, WM_KEYUP, key, lParam or $C0000000);
    end;
   (* process the messages *)
    Application.ProcessMessages;
    (* restore the old key state map *)
    SetKeyboardState(pKeyBuffers^[1]);
    finally
      (* free the memory for the key state buffers *)
      if pKeyBuffers <> nil then
      Dispose(pKeyBuffers);
    end; { If }
  end;
end; { PostKeyEx }

procedure TForm1.Button1Click(Sender: TObject);
var
  targetWnd: HWND;
begin
  targetWnd := 0;
  targetWnd := FindWindow('notepad',nil);
  if targetWnd <> 0 then
  begin
    PostKeyExHWND(targetWnd, Ord('I'), [], False);
  end;
end;



end.
0
 
LVL 2

Expert Comment

by:Tasomia
ID: 7005397
1. You need the correct handle:

 Wnd := FindWindow('notepad', nil);
 if wnd <> 0 then
 begin
   wnd := FindWindowEx(Wnd, 0, 'Edit', nil);
   //...

2.
 Note that Setting the keyboard state will not work across Applications
 running in different memory spaces on Win32 unless AttachThreadInput is
 used to connect to the target thread first.
0
 

Expert Comment

by:jeff168
ID: 7014200
use hook
0
 
LVL 1

Expert Comment

by:Moondancer
ID: 7014847
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Author Comment

by:lopem
ID: 7014971
How, Jeff?
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Accepted Solution

by:
jeff168 earned 200 total points
ID: 7019824
you can find a sample from <<Delphi5 Developer's Guid>>
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LVL 1

Expert Comment

by:Moondancer
ID: 7068888
Finalized by Moondancer - EE Moderator
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