C++Windowsh写一个图形页面并画一个边框红色填充红色的圆

以下是使用C++和Windows.h库编写的一个图形页面，并画一个边框为红色、填充为红色的圆：

#include <Windows.h>

// 窗口宽度和高度
#define WINDOW_WIDTH 600
#define WINDOW_HEIGHT 400

// 圆的半径
#define CIRCLE_RADIUS 100

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
        case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hwnd, &ps);

            // 设置圆的边框颜色为红色
            HPEN hPen = CreatePen(PS_SOLID, 1, RGB(255, 0, 0));
            SelectObject(hdc, hPen);

            // 设置圆的填充颜色为红色
            HBRUSH hBrush = CreateSolidBrush(RGB(255, 0, 0));
            SelectObject(hdc, hBrush);

            // 计算圆心坐标
            int centerX = WINDOW_WIDTH / 2;
            int centerY = WINDOW_HEIGHT / 2;

            // 画圆
            Ellipse(hdc, centerX - CIRCLE_RADIUS, centerY - CIRCLE_RADIUS, centerX + CIRCLE_RADIUS, centerY + CIRCLE_RADIUS);

            // 释放资源
            DeleteObject(hPen);
            DeleteObject(hBrush);
            EndPaint(hwnd, &ps);
            break;
        }
        case WM_CLOSE:
            DestroyWindow(hwnd);
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 注册窗口类
    WNDCLASS wc = {0};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszClassName = "MyWindowClass";
    RegisterClass(&wc);

    // 创建窗口
    HWND hwnd = CreateWindow("MyWindowClass", "My Window", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, WINDOW_WIDTH, WINDOW_HEIGHT, NULL, NULL, hInstance, NULL);

    // 显示窗口
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}

上述代码会创建一个窗口，并在窗口中央画一个边框为红色、填充为红色的圆