Low Level Keyboard Hook problem

Hi Folks,

I'm currently writting a LLKeyboard hook, my goal is to redirect all inputs just to one window, regardless what other applications are running.
I made it acutall working so my problem is more trivial:

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Code:

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LRESULT CALLBACK LLHook(int nCode, WPARAM wParam, LPARAM lParam){
          KBDLLHOOKSTRUCT *pkh = (KBDLLHOOKSTRUCT *) lParam;
          BOOL bCtrl        = GetAsyncKeyState(VK_CONTROL)>>((sizeo(SHORT) * 8) - 1);
          BOOL bShift        = GetAsyncKeyState(VK_SHIFT)>>((sizeof(SHORT) * 8) - 1);
               
          if (nCode==HC_ACTION) {
                    if(GetFocus() == hWndredirect){
                            if(!bCtrl && !bShift){                               
                                  PostMessage(GetFocus(),WM_KEYDOWN,pkh->vkCode,pkh->scanCode);
                                  //PostMessage(GetFocus(),WM_KEYUP,pkh->vkCode,(LPARAM)0);                               
                            }                       
                    }
                    else SetFocus(hWndredirect);
            }
          return(-1);
}

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This code works well, my only problem is that hWndredirect receives all keys twice. You type "a", "aa" appears and so on, I outcommented the WM_KEYUP message already, without that it was "aaaa".
My guess is that there probably something is wrong with the scanCode but I can't figure out the problem really.

Thanks in Advance, Andy

Your problem is that in the hook you don’t distinguish between Down/Up stroke whenever you enter the hook you sending WM_KEYDOWN message first for the down and second for the up.

Code:

---

if (nCode==HC_ACTION)
{
    if(GetFocus() == hWndredirect)
  {
    if(!bCtrl && !bShift)
    { 
      if ( wParam == WM_KEYDOWN)
        PostMessage(GetFocus(),WM_KEYDOWN,pkh->vkCode,pkh->scanCode);
      else if ( wParam == WM_KEYUP )
        PostMessage(GetFocus(),WM_KEYUP,pkh->vkCode,(LPARAM)0);       
    }     
  }
  else SetFocus(hWndredirect);
}

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Just bear in mind that there are other events like WM_SYSKEYDOWN/WM_SYSKEYUP.

Cheers

Thanks for reply, you were right I forgot to catch that.
But its still not really good... when I pass the scanCode the result
is a senseless number of characters.. but when I pass (LPARAM)0 insteat, it works fine.

Any explanation for that?