使用C++语言编写一个Windows的登陆界面，并实现登陆用户名和密码的记录

下面是一个简单的登陆界面的代码示例，使用C++和Win32 API编写：

#include <windows.h>

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

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    static TCHAR szAppName[] = TEXT("Login");
    HWND hwnd;
    MSG msg;
    WNDCLASS wndclass;

    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szAppName;

    if (!RegisterClass(&wndclass))
    {
        MessageBox(NULL, TEXT("This program requires Windows NT!"), szAppName, MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(szAppName, TEXT("Login"), WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 320, 240,
        NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static HWND hwndEdit1, hwndEdit2, hwndButton;
    static TCHAR szUsername[32], szPassword[32];

    switch (message)
    {
    case WM_CREATE:
        hwndEdit1 = CreateWindow(TEXT("edit"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | ES_AUTOHSCROLL,
            100, 50, 150, 20, hwnd, (HMENU)1, ((LPCREATESTRUCT)lParam)->hInstance, NULL);
        hwndEdit2 = CreateWindow(TEXT("edit"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | ES_PASSWORD | ES_AUTOHSCROLL,
            100, 80, 150, 20, hwnd, (HMENU)2, ((LPCREATESTRUCT)lParam)->hInstance, NULL);
        hwndButton = CreateWindow(TEXT("button"), TEXT("Login"), WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
            130, 120, 80, 30, hwnd, (HMENU)3, ((LPCREATESTRUCT)lParam)->hInstance, NULL);
        return 0;

    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case 3: // Login button clicked
            GetWindowText(hwndEdit1, szUsername, 32);
            GetWindowText(hwndEdit2, szPassword, 32);
            // TODO: Check username and password and do something
            MessageBox(hwnd, TEXT("Username and password saved!"), TEXT("Login"), MB_OK);
            return 0;
        }
        return 0;

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc(hwnd, message, wParam, lParam);
}

这个登陆界面包括了两个文本框和一个“Login”按钮。当用户点击“Login”按钮时，程序会获取文本框中的用户名和密码，然后弹出一个消息框来提示用户用户名和密码已经记录下来了。在实际应用中，你需要将这些数据保存到一个文件或者数据库中，然后在进行登陆验证时读取这些数据。