change the Keybord Input

How to change the input from keyboard before it has been processed by the target window?

Thanx for any kind of help...
Regards,
Shail2k4

Using WH_KEYBOARD hook, I guess.

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Originally Posted by VictorN

Using WH_KEYBOARD hook, I guess.

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Thanx for the reply...

Only one thing in my mind is that the input must be changed before the application processes it.

Consider an application A which contains a text field sey "Name". Now if user types "A" in the "Name" field then it should be changed to "B".

Regards,
Shail2k4

Why do you want to do that?

You won't find help writing malicious code here.

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Originally Posted by shail2k4

Consider an application A which contains a text field sey "Name". Now if user types "A" in the "Name" field then it should be changed to "B".

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The complete code in C had been posted many times on api ng
news://nntp.aioe.org/comp.os.ms-wind...ogrammer.win32
since '90s
- and it's not with WH_KEYBOARD)

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Originally Posted by GCDEF

Why do you want to do that?

You won't find help writing malicious code here.

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I want to break up a barcode input into two string by replacing some special characters. The best way i know is by using hooks.

Thanx for any kind of help,
Regards,
Shail2k4

Quote:

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Originally Posted by shail2k4

I want to break up a barcode input into two string by replacing some special characters. The best way i know is by using hooks.

Thanx for any kind of help,
Regards,
Shail2k4

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What does that have to do with your original question?

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Originally Posted by GCDEF

What does that have to do with your original question?

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Barcode scanner is connected to the keyboard via PS2 port, the scanned code is same as the keyboard input and i can monitor it with the WH_KEYBOARD hook but can not change.

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Originally Posted by shail2k4

Barcode scanner is connected to the keyboard via PS2 port, the scanned code is same as the keyboard input and i can monitor it with the WH_KEYBOARD hook but can not change.

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Perhaps you could do something with PreTranslateMessage or handling WM_CHAR.

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Originally Posted by shail2k4

... i can monitor it with the WH_KEYBOARD hook but can not change.

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Could you show how you have tried to change it?

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Originally Posted by GCDEF

Perhaps you could do something with PreTranslateMessage or handling WM_CHAR.

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The barcode input may be in any application, means that the barcode data should be changed on the scanning globally.

The global hook can monitor the code. now how can i use PreTranslateMessage message globally.

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Originally Posted by VictorN

Could you show how you have tried to change it?

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Code:

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LRESULT CALLBACK KeyboardProc(INT nCode, WPARAM wParam, LPARAM lParam)
{
        if (nCode != HC_ACTION)
                return ::CallNextHookEx(g_hHook, nCode, wParam, lParam);
if(wParam==' ' || wParam==',')
        wParam=0x0d;
return ::CallNextHookEx(g_hHook, nCode, wParam, lParam);       
}

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Please suggest me if it is wrong.

Is there any way that i can block the input of "," or "#" or SPACE and replace it with ENTER using the WH_KEYBOARD hook ?

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Originally Posted by shail2k4

Please suggest me if it is wrong.

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I never used global hooks, therefore can only guess: perhaps, you should also change the scan code part of LPARAM?
Another variant - try to SendInput with VK_RETURN instead. :confused:

Quote:

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Originally Posted by VictorN

I never used global hooks, therefore can only guess: perhaps, you should also change the scan code part of LPARAM?
Another variant - try to SendInput with VK_RETURN instead. :confused:

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Everything is resolved for the Window Based Application, the need was to use WH_GETMESSAGE.

Now only one thing is that its not working for DOS based application.

Regards,
Shail2k4

Quote:

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Originally Posted by shail2k4

Everything is resolved for the Window Based Application, the need was to use WH_GETMESSAGE.

Now only one thing is that its not working for DOS based application.

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I guess it is because there is no message pump in a DOS based application?

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Originally Posted by VictorN

I guess it is because there is no message pump in a DOS based application?

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Is there any way for the DOS based applications?

It is possible because I have seen an application on the internet named "KeyStroke Converter" which changes the keyboard input in the Window and DOS based applications.

Regards,
Shail2k4

Is it possible to use WH_KEYBOARD_LL hook in visual C++ 6.0?

Yes, of course!

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Requirements

Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
Windows 95/98: Unsupported.
Header: Declared in Winuser.h; include Windows.h.

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