🔐 Virtual ATM Machine using C++ | Secure Login, Deposit & Withdraw Demo | FuzzuTech

 Demo :


Click Video 👇👇👇
















➤ Features :

  • Secure PIN-based login

  • Deposit & Withdraw Buttons

  • Balance Display

  • Logout and session reset

  • Built in pure C++ with Windows API


Code :


#define _WIN32_WINNT 0x0601

#define WIN32_LEAN_AND_MEAN


#include <windows.h>

#include <string>

#include <sstream>


#pragma comment(lib, "user32.lib")

#pragma comment(lib, "gdi32.lib")


// Global variables

HWND hBalanceStatic;

HWND hDepositBtn, hWithdrawBtn, hCheckBtn, hLogoutBtn;

HWND hPinStatic, hPinEdit, hLoginBtn;


int balance = 1000;    // initial balance

const std::string correctPIN = "1234";

bool loggedIn = false;


// Forward declarations

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

void UpdateBalanceText(HWND hwnd);

void ShowMessage(LPCSTR msg, LPCSTR title);

std::string GetTextFromEdit(HWND hwnd);

void ClearPinInput();


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int nCmdShow) {

    // Register Window Class

    WNDCLASSEX wc{ sizeof(WNDCLASSEX) };

    wc.lpfnWndProc = WndProc;

    wc.hInstance = hInstance;

    wc.lpszClassName = "VirtualATMClass";

    wc.hCursor = LoadCursor(NULL, IDC_ARROW);

    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);


    RegisterClassEx(&wc);


    // Create Window

    HWND hWnd = CreateWindowEx(

        0, "VirtualATMClass", "Virtual ATM Machine - Fuzzu Developer",

        WS_OVERLAPPEDWINDOW & ~WS_THICKFRAME & ~WS_MAXIMIZEBOX,

        CW_USEDEFAULT, CW_USEDEFAULT, 400, 320,

        NULL, NULL, hInstance, NULL);


    if (!hWnd) return 0;


    ShowWindow(hWnd, nCmdShow);

    UpdateWindow(hWnd);


    // Message Loop

    MSG msg{};

    while (GetMessage(&msg, NULL, 0, 0)) {

        TranslateMessage(&msg);

        DispatchMessage(&msg);

    }


    return (int)msg.wParam;

}


// Helper: Show MessageBox

void ShowMessage(LPCSTR msg, LPCSTR title) {

    MessageBoxA(NULL, msg, title, MB_OK | MB_ICONINFORMATION);

}


// Helper: Update balance label text

void UpdateBalanceText(HWND hwnd) {

    std::stringstream ss;

    ss << "Balance: $" << balance;

    SetWindowTextA(hwnd, ss.str().c_str());

}


// Helper: Get text from an edit control as std::string

std::string GetTextFromEdit(HWND hwnd) {

    int length = GetWindowTextLengthA(hwnd);

    if (length == 0) return "";

    char* buffer = new char[length + 1];

    GetWindowTextA(hwnd, buffer, length + 1);

    std::string text(buffer);

    delete[] buffer;

    return text;

}


// Helper: Clear PIN input

void ClearPinInput() {

    SetWindowTextA(hPinEdit, "");

}


LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {

    switch (msg) {

    case WM_CREATE:

    {

        // Create PIN input controls

        hPinStatic = CreateWindowA("STATIC", "Enter PIN:", WS_VISIBLE | WS_CHILD, 30, 30, 80, 20, hwnd, NULL, NULL, NULL);

        hPinEdit = CreateWindowA("EDIT", "", WS_VISIBLE | WS_CHILD | WS_BORDER | ES_PASSWORD, 120, 25, 150, 25, hwnd, NULL, NULL, NULL);

        hLoginBtn = CreateWindowA("BUTTON", "Login", WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, 280, 25, 80, 25, hwnd, (HMENU)100, NULL, NULL);


        // Balance display (hidden initially)

        hBalanceStatic = CreateWindowA("STATIC", "Balance: $0", WS_CHILD | WS_VISIBLE, 30, 70, 300, 30, hwnd, NULL, NULL, NULL);


        // Buttons (hidden initially)

        hDepositBtn = CreateWindowA("BUTTON", "Deposit $100", WS_CHILD | WS_VISIBLE, 30, 120, 150, 40, hwnd, (HMENU)101, NULL, NULL);

        hWithdrawBtn = CreateWindowA("BUTTON", "Withdraw $100", WS_CHILD | WS_VISIBLE, 200, 120, 150, 40, hwnd, (HMENU)102, NULL, NULL);

        hCheckBtn = CreateWindowA("BUTTON", "Check Balance", WS_CHILD | WS_VISIBLE, 30, 180, 150, 40, hwnd, (HMENU)103, NULL, NULL);

        hLogoutBtn = CreateWindowA("BUTTON", "Logout", WS_CHILD | WS_VISIBLE, 200, 180, 150, 40, hwnd, (HMENU)104, NULL, NULL);


        // Initially disable buttons except login-related controls

        ShowWindow(hBalanceStatic, SW_HIDE);

        ShowWindow(hDepositBtn, SW_HIDE);

        ShowWindow(hWithdrawBtn, SW_HIDE);

        ShowWindow(hCheckBtn, SW_HIDE);

        ShowWindow(hLogoutBtn, SW_HIDE);


        break;

    }

    case WM_COMMAND:

        switch (LOWORD(wParam)) {

        case 100:  // Login button

        {

            std::string pin = GetTextFromEdit(hPinEdit);

            if (pin == correctPIN) {

                loggedIn = true;

                ShowMessage("Login Successful!", "Welcome");


                // Hide login controls

                ShowWindow(hPinStatic, SW_HIDE);

                ShowWindow(hPinEdit, SW_HIDE);

                ShowWindow(hLoginBtn, SW_HIDE);


                // Show ATM controls

                UpdateBalanceText(hBalanceStatic);

                ShowWindow(hBalanceStatic, SW_SHOW);

                ShowWindow(hDepositBtn, SW_SHOW);

                ShowWindow(hWithdrawBtn, SW_SHOW);

                ShowWindow(hCheckBtn, SW_SHOW);

                ShowWindow(hLogoutBtn, SW_SHOW);

            }

            else {

                ShowMessage("Incorrect PIN. Try again.", "Error");

                ClearPinInput();

            }

            break;

        }

        case 101:  // Deposit $100

        {

            if (loggedIn) {

                balance += 100;

                UpdateBalanceText(hBalanceStatic);

                ShowMessage("Deposited $100 successfully.", "Deposit");

            }

            break;

        }

        case 102:  // Withdraw $100

        {

            if (loggedIn) {

                if (balance >= 100) {

                    balance -= 100;

                    UpdateBalanceText(hBalanceStatic);

                    ShowMessage("Withdrawn $100 successfully.", "Withdraw");

                }

                else {

                    ShowMessage("Insufficient balance!", "Withdraw Error");

                }

            }

            break;

        }

        case 103:  // Check Balance

        {

            if (loggedIn) {

                std::stringstream ss;

                ss << "Your current balance is $" << balance;

                ShowMessage(ss.str().c_str(), "Balance");

            }

            break;

        }

        case 104:  // Logout

        {

            loggedIn = false;


            // Hide ATM controls

            ShowWindow(hBalanceStatic, SW_HIDE);

            ShowWindow(hDepositBtn, SW_HIDE);

            ShowWindow(hWithdrawBtn, SW_HIDE);

            ShowWindow(hCheckBtn, SW_HIDE);

            ShowWindow(hLogoutBtn, SW_HIDE);


            // Show login controls

            ShowWindow(hPinStatic, SW_SHOW);

            ShowWindow(hPinEdit, SW_SHOW);

            ShowWindow(hLoginBtn, SW_SHOW);


            ClearPinInput();


            ShowMessage("Logged out successfully.", "Logout");

            break;

        }

        }

        break;


    case WM_CLOSE:

        DestroyWindow(hwnd);

        break;


    case WM_DESTROY:

        PostQuitMessage(0);

        break;


    default:

        return DefWindowProc(hwnd, msg, wParam, lParam);

    }

    return 0;

}

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