How to emulate keyboard

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6 total messages Started by Sanyin Thu, 03 Jul 2008 11:29

#82

Author: Sanyin
Date: Thu, 03 Jul 2008 11:29

5 lines
1071 bytes

I am trying to make software keyboard.
Everything is fine, but how to keep focus while typing?
E.g. when typing into web browser control, how to keep focus there when user
clicks some key?
Key press is emulated using SendInput WinAPI.

Re: How to emulate keyboard

#88

Author: Remy Lebeau (TeamB)
Date: Thu, 03 Jul 2008 17:54

18 lines
1548 bytes

"Sanyin" <prevodilac@hotmail.com> wrote in message 
news:486cb803@newsgroups.borland.com...

> I am trying to make software keyboard.

Why not just use the one that is build into Windows?  Have a look at 
"osk.exe".

> Everything is fine, but how to keep focus while typing?

Have your form intercept the WM_MOUSEACTIVATE message and return 
MA_NOACTIVATE.  The click will still be processed, but the form will not 
receive focus.  The downside, though, is that the previously focused window 
still loses its focus.  I do not know how osk.exe prevents that.


Gambit

Re: How to emulate keyboard

#87

Author: Peter Below (TeamB)
Date: Thu, 03 Jul 2008 18:07

17 lines
1385 bytes

Sanyin wrote:

> I am trying to make software keyboard.
> Everything is fine, but how to keep focus while typing?
> E.g. when typing into web browser control, how to keep focus there
> when user clicks some key?
> Key press is emulated using SendInput WinAPI.

Example for virtual keypad
 http://cc.codegear.com/item/18590

-- 
Peter Below (TeamB)  
Don't be a vampire (http://slash7.com/pages/vampires), 
use the newsgroup archives :
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http://groups.google.com

Re: How to emulate keyboard

#91

Author: Remy Lebeau (TeamB)
Date: Thu, 03 Jul 2008 22:29

41 lines
2234 bytes

"Remy Lebeau (TeamB)" <no.spam@no.spam.com> wrote in message 
news:486d12b0$1@newsgroups.borland.com...

> The downside, though, is that the previously focused window still
> loses its focus.  I do not know how osk.exe prevents that.

Nevermind, I see how now, the WS_EX_NOACTIVATE window style.

The following works for me now:

    TForm1 = class(TForm)
    published
        SpeedButton1: TSpeedButton;
        procedure SpeedButton1Click(Sender: TObject);
    private
        procedure WMMouseActivate(TMessage &Message); message 
WM_MOUSEACTIVATE;
    protected
        procedure CreateParams(var Params: TCreateParams); override;
    end;

    procedure TForm1.WMMouseActivate(var Message: TMessage);
    begin
        Message.Result := MA_NOACTIVATE;
    end;

    procedure TForm1.SpeedButton1Click(Sender: TObject);
    begin
        keybd_event(Ord('A'), 0, 0, 0);
        keybd_event(Ord('A'), 0, KEYEVENTF_KEYUP, 0);
    end;

    procedure TForm1.CreateParams(var Params: TCreateParams);
    begin
        inherited;
        Params.ExStyle := Params.ExStyle or WS_EX_NOACTIVATE;
    end;


Gambit

Re: How to emulate keyboard

#181

Author: Sanyin
Date: Mon, 14 Jul 2008 07:09

15 lines
1454 bytes

"Remy Lebeau (TeamB)" <no.spam@no.spam.com> wrote in message 
news:486d12b0$1@newsgroups.borland.com...
>
> "Sanyin" <prevodilac@hotmail.com> wrote in message 
> news:486cb803@newsgroups.borland.com...
>
>> I am trying to make software keyboard.
>
> Why not just use the one that is build into Windows?  Have a look at 
> "osk.exe".
>
Application needs to work with other applications-like osk.exe.
Osk is fine, but I need own component.
I suppose answer is some API hooking, right?

Re: How to emulate keyboard

#185

Author: Yannis
Date: Mon, 14 Jul 2008 14:14

15 lines
1149 bytes

Sanyin wrote:

> Application needs to work with other applications-like osk.exe.
> Osk is fine, but I need own component.
> I suppose answer is some API hooking, right?

No. API Messaging is the answer NOT hooking. 

You need to take a closer look on how the keyboard events are handled by the os
it self and replicate it in your application.

regards
Yannis.

--

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