#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <iostream>

using namespace std;

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
	PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT) lParam;
	BOOL fEatKeystroke = FALSE;

	if (nCode == HC_ACTION)
	{
		switch (wParam)
		{
		case WM_KEYDOWN:
		case WM_SYSKEYDOWN:
		case WM_KEYUP:
		case WM_SYSKEYUP:
			{	
				//block out keys A-Z
				if ( p->vkCode <= 90 && p->vkCode >= 41 )
				{
					fEatKeystroke = true;
				}

				//if we're gonna drop the keystroke
				if (fEatKeystroke)
				{
					//Show on the console that the key was pressed...
					cout << (char)p->vkCode << " Pressed, scancode: " << (p->scanCode) << endl;

					//Simulate another random key (random # that I came up with).
					p->vkCode = 70;
					p->scanCode = 30;

					//This probably isn't necessary, but I'm doing it instead
					lParam = (LPARAM)p;
				}
				break;
			}
		}
	}

	//Call the next hook if the key isn't going to be dropped...
	//return(fEatKeystroke ? 1 : CallNextHookEx(NULL, nCode, wParam, lParam));
	return CallNextHookEx ( NULL, nCode, wParam, lParam );
}

int main ( void )
{
	// Install the low-level keyboard & mouse hooks
	HHOOK hhkLowLevelKybd  = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, NULL, 0);

	// Keep this app running until we're told to stop
	MessageBox(NULL,
		TEXT("Click \"Ok\" to terminate this application."),
		TEXT("Disable Low-Level Keys"), MB_OK);

	UnhookWindowsHookEx(hhkLowLevelKybd);

	return(0);
}

switch (wParam)
		{
		case WM_KEYDOWN:
		case WM_SYSKEYDOWN:
		case WM_KEYUP:
		case WM_SYSKEYUP:

//block out keys A-Z
				if ( p->vkCode <= 90 && p->vkCode >= 41 )
				{
					fEatKeystroke = true;
				}