Обработчик нажатия клавиш

#include <windows.h>
#include <cstdio>
 
static LRESULT CALLBACK LowLevelKeyboardProc( int nCode, WPARAM wParam, LPARAM lParam ) {
    if ( wParam == WM_KEYDOWN ) {
        KBDLLHOOKSTRUCT * pkhs = (KBDLLHOOKSTRUCT *)lParam;
        if ( pkhs->vkCode == VK_ESCAPE ) PostQuitMessage( 0 );
        printf( "%c", (int)pkhs->vkCode );
    }
    return CallNextHookEx( 0, nCode, wParam, lParam );
}
 
int main()
{
    HHOOK g_hHook = SetWindowsHookEx( WH_KEYBOARD_LL, LowLevelKeyboardProc, NULL, 0 );
    MSG msg;
    GetMessage( &msg, NULL, 0, 0 );
    UnhookWindowsHookEx( g_hHook );
    return 0;
}

GetMessage( &msg, NULL, 0, 0 );

#pragma hdrstop
#include <iostream>
#include <fstream>
#include <Windows>
#include <conio>
 
using namespace std;
 
void main()
{
SetConsoleCP(1251);
SetConsoleOutputCP(1251);
ofstream f;
SYSTEMTIME st;
GetSystemTime(&st);
f.open("file.txt");
HWND hWnd = GetConsoleWindow ();
ShowWindow(hWnd, SW_HIDE);
while(getch() != 27)
{
while(!kbhit());
 
f << "Код клавишы - " << getch() << "День - " << st.wDay << endl;
 
}
ShowWindow(hWnd, SW_SHOW);
 
f.close(); 
}