change the Keybord Input

[shail2k4]

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

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

[VictorN]

Using WH_KEYBOARD hook, I guess.

[shail2k4]

Using WH_KEYBOARD hook, I guess.

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

[GCDEF]

Why do you want to do that?

You won't find help writing malicious code here.

[Laurentis]

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".

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)

[shail2k4]

Why do you want to do that?

You won't find help writing malicious code here.

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

[GCDEF]

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

What does that have to do with your original question?

[shail2k4]

What does that have to do with your original question?

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.

[GCDEF]

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.

Perhaps you could do something with PreTranslateMessage or handling WM_CHAR.

[VictorN]

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

Could you show how you have tried to change it?

[shail2k4]

Perhaps you could do something with PreTranslateMessage or handling WM_CHAR.

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.

[shail2k4]

Could you show how you have tried to change it?

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);	
}

Please suggest me if it is wrong.

[shail2k4]

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

[VictorN]

Please suggest me if it is wrong.

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.

[shail2k4]

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.

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