帮我写一段vc五彩气球的代码

好的，以下是一个简单的VC++五彩气球代码示例：

#include <windows.h>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <vector>
using namespace std;

// 窗口类名
const char g_szClassName[] = "MyWindowClass";

// 气球结构体
struct Balloon {
    int x, y;           // 气球位置
    int r;              // 气球半径
    int dx, dy;         // 气球移动速度
    COLORREF color;     // 气球颜色
};

// 全局变量
vector<Balloon> g_balloons;      // 气球数组
int g_bkWidth, g_bkHeight;       // 背景大小

// 生成随机颜色
COLORREF RandomColor() {
    return RGB(rand() % 256, rand() % 256, rand() % 256);
}

// 初始化气球
void InitBalloons() {
    g_balloons.clear();
    for (int i = 0; i < 20; i++) {
        Balloon balloon;
        balloon.x = rand() % (g_bkWidth - 100) + 50;
        balloon.y = rand() % (g_bkHeight - 100) + 50;
        balloon.r = rand() % 30 + 20;
        balloon.dx = rand() % 5 + 1;
        balloon.dy = rand() % 5 + 1;
        balloon.color = RandomColor();
        g_balloons.push_back(balloon);
    }
}

// 绘制气球
void DrawBalloon(HDC hdc, Balloon &balloon) {
    HBRUSH hBrush = CreateSolidBrush(balloon.color);
    HBRUSH hOldBrush = (HBRUSH)SelectObject(hdc, hBrush);
    Ellipse(hdc, balloon.x - balloon.r, balloon.y - balloon.r, balloon.x + balloon.r, balloon.y + balloon.r);
    SelectObject(hdc, hOldBrush);
    DeleteObject(hBrush);
}

// 窗口过程函数
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    switch (msg) {
    case WM_CREATE:
        // 获取窗口大小
        RECT rc;
        GetClientRect(hwnd, &rc);
        g_bkWidth = rc.right - rc.left;
        g_bkHeight = rc.bottom - rc.top;
        // 初始化随机数种子
        srand(time(NULL));
        // 初始化气球
        InitBalloons();
        // 设置定时器
        SetTimer(hwnd, 1, 10, NULL);
        break;
    case WM_PAINT:
        // 绘制背景
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hwnd, &ps);
        HBRUSH hBrush = CreateSolidBrush(RGB(255, 255, 255));
        FillRect(hdc, &ps.rcPaint, hBrush);
        DeleteObject(hBrush);
        // 绘制气球
        for (int i = 0; i < g_balloons.size(); i++) {
            DrawBalloon(hdc, g_balloons[i]);
        }
        EndPaint(hwnd, &ps);
        break;
    case WM_TIMER:
        // 移动气球
        for (int i = 0; i < g_balloons.size(); i++) {
            Balloon &balloon = g_balloons[i];
            balloon.x += balloon.dx;
            balloon.y += balloon.dy;
            // 碰撞检测
            if (balloon.x - balloon.r < 0 || balloon.x + balloon.r > g_bkWidth) {
                balloon.dx = -balloon.dx;
            }
            if (balloon.y - balloon.r < 0 || balloon.y + balloon.r > g_bkHeight) {
                balloon.dy = -balloon.dy;
            }
        }
        // 重绘窗口
        InvalidateRect(hwnd, NULL, FALSE);
        break;
    case WM_DESTROY:
        // 销毁定时器
        KillTimer(hwnd, 1);
        // 退出程序
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

// WinMain函数
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    // 创建窗口类
    WNDCLASSEX wc;
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = g_szClassName;
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    if (!RegisterClassEx(&wc)) {
        MessageBox(NULL, "窗口类注册失败！", "错误", MB_ICONERROR);
        return 0;
    }

    // 创建窗口
    HWND hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, g_szClassName, "五彩气球", WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hInstance, NULL);
    if (hwnd == NULL) {
        MessageBox(NULL, "窗口创建失败！", "错误", MB_ICONERROR);
        return 0;
    }

    // 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;
}

这个代码会在窗口中绘制20个随机颜色的气球，气球会在窗口中自由移动，碰到窗口边缘会反弹。如果需要添加音效和背景音乐，您可以使用WinAPI提供的多媒体函数来实现。