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SetWindowsHookEx Keyboard Hook

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Overload
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Joined: 08 Feb 2008
Posts: 293

Posted: Sun Nov 09, 2008 10:07 pm Post subject: SetWindowsHookEx Keyboard Hook

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I'm having some troubles with this Keyboard Hook.dll

Code:

#include "windows.h"

HHOOK hHOOK = NULL;
unsigned char Signature[] = { VK_F1, VK_F2, VK_F3, VK_F4, VK_SPACE };

LRESULT CALLBACK CallBack(
                           int nCode,
                           WPARAM wParam,
                           LPARAM lParam)
{
int Index = 0;
if ( nCode == HC_ACTION )
{
   unsigned char* Keys = new unsigned char[sizeof(Signature)];
   if (Index<4)
      *(unsigned char*)Keys[Index] = (unsigned char)wParam;
   if (Index==4)
      if (!memcmp(&Signature, Keys, Index))
      {
         Index = 0;
         MessageBox(NULL, "test", "test", MB_OK);
      }
   ZeroMemory(Keys, sizeof(Keys));
   Index++;
   delete(Keys);
}
return CallNextHookEx( hHOOK, nCode, wParam, lParam );
}

BOOL APIENTRY DllMain( HINSTANCE hInstance,
               DWORD ul_reason_for_call,
               LPVOID lpReserved )
{
switch( ul_reason_for_call )
{
   case DLL_PROCESS_ATTACH:
      hHOOK = SetWindowsHookEx( WH_KEYBOARD, (HOOKPROC)CallBack, hInstance, 0 );
      break;
   case DLL_PROCESS_DETACH:
      UnhookWindowsHookEx( hHOOK );
      break;
}
}

I created a program just to load the dll into itself. Doesn't that mean this hook to apply to that program?

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samuri25404
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Posted: Sun Nov 09, 2008 10:26 pm Post subject:

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What exactly are you attempting to do?

Code:

int Index = 0;
if ( nCode == HC_ACTION )
{
unsigned char* Keys = new unsigned char[sizeof(Signature)];
if (Index<4)
*(unsigned char*)Keys[Index] = (unsigned char)wParam;

This will always occur; Index will equal 0, no matter what.

Did you mean to make it static?
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Overload
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Posts: 293

Posted: Sun Nov 09, 2008 10:33 pm Post subject:

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Whoops, no I didn't mean to make it static. But I still don't know how I could get it working. I tried removing the if(Index<4). I honestly don't know.
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sloppy
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Posts: 123

Posted: Mon Nov 10, 2008 2:11 am Post subject:

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Well for starters, DllMain is not returning any value.. when you call LoadLibrary() the system will immediately unload the dll.

Code:

BOOL APIENTRY DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
switch (dwReason)
{
case DLL_PROCESS_ATTACH:
   hHOOK = SetWindowsHookEx( WH_KEYBOARD, (HOOKPROC)CallBack, hInstance, 0 );
   return TRUE;

case DLL_PROCESS_DETACH:
   UnhookWindowsHookEx( hHOOK );
   return TRUE;
}
return TRUE;
}

The rest of your code is a mess to look at, what are you trying to do? Global hotkeys for VK_F1, VK_F2, VK_F3, etc? Here is a simple example,

Code:

LRESULT CALLBACK CallBack(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode < 0) // do not process message
   return CallNextHookEx( hHOOK, nCode, wParam, lParam );

if (nCode == HC_ACTION)
{
   bool bKeyDown = (HIWORD(lParam) & KF_UP) == 0;

   switch (wParam)
   {
   case VK_F1:
      if (bKeyDown) {
         MessageBox(NULL, "F1 down", "", MB_OK);
      } else {
         MessageBox(NULL, "F1 up", "", MB_OK);
      }
      break;
   }
}

return CallNextHookEx( hHOOK, nCode, wParam, lParam );
}

Ideally you should pass the message to your main window and handle the logic there.

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