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Keyboard Hook

Posted on 2000-02-29
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Last Modified: 2008-02-01
Please anybody can tell me (or better yet, show me where I can get a sample source code in Visual C++ V6) how to write a keyboard hook that intercepts keyboard data from all threads (global hook). I got the example from MSDN (Hooks32) but I could not compile in VC++ V6, apparently that was written under either VC++ V2 or V4.
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Question by:Volga
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6 Comments
 
LVL 8

Expert Comment

by:gelbert
ID: 2570633
You can use SetWindowsHookEx with WH_KEYBOARD.
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LVL 8

Expert Comment

by:gelbert
ID: 2570646
There is a sample by Paul DiLascia
in MSDN. Just look for "SetWindowsHookEx" keyword and scroll results until you see "C++ Q & A" for "Periodicals 1997". He is using this function in his program.
Also there are other samples for the same thing in MSDN
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LVL 8

Expert Comment

by:gelbert
ID: 2570656
Another sample (if you do not have MSDN CD) is source code to "Visual C++ Windows Shell Programming" by Dino Esposito at www.wrox.com. Look around website for book page and there reference to download source code. Search source code for "SetWindowsHook"
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LVL 5

Accepted Solution

by:
Wyn earned 200 total points
ID: 2571361
Here is a easy sample I wrote:
//for *.dll:

#include <windows.h>

#pragma data_seg(".shared")
HHOOK hhook=NULL;
#pragma data_seg()
#pragma comment(linker,"/SECTION:.shared,RWS")

HINSTANCE hdll;

LRESULT CALLBACK ClockClass::KeyBoardProc(int nCode,WPARAM wParam,LPARAM lParam)
{
//do whatever you want here
return CallNextHookEx(hhook,nCode,wParam,lParam);
}
   

int APIENTRY DllMain (HINSTANCE hInstance,DWORD dwReason,LPVOID lpReserved)
{ if ( dwReason == DLL_PROCESS_ATTACH)
hdll = hInstance;
return (int)(DisableThreadLibraryCalls (hdll));
}



_declspec(dllexport) void SetTheHook()
{
hhook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC),KeyBoardProc,hdll,NULL);
);
   
}

_declspec(dllexport) void RemoveTheHook()
{
   UnhookWindowsHookEx(hhook);
}

Now,you can write a .exe and call SetTheHook() and later you call RemoveTheHook.You'v got to link with .lib of that .dll .
Regards
W.Yinan

0
 

Author Comment

by:Volga
ID: 2577429
gelbert,
thanks for your suggestions but I had a hard time finding the right sample at the location.

wyn,
you are the closest who can give me some kind of sample code, even though I had to clean out some syntax error before being able to compile it. You have an extra ');' the line after SetWindowsHookEx.
I wrote an application that call SetTheHook in that dll but it looks like nothing happens. Do I need another hook (like WH_GETMESSAGE) to make it work?

Volga


0
 

Author Comment

by:Volga
ID: 2605697
wyn,

I have to accept your question, since I was able to compile the dll. But I'm still unable to write a program to translate the keyboard.
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