#define WIN32_LEAN_AND_MEAN#include <windows.h>#include <windowsx.h>#include <mmsystem.h>#include <stdio.h>#include <stdlib.h>#include <math.h>#define WINDOW_CLASS_NAME "WINCLASS1"#define WINDOW_WIDTH  640#define WINDOW_HEIGHT 480#define KEYDOWN(vk_code)    ((GetAsyncKeyState(vk_code) & 0x8000) ? 1:0)#define KEYUP(vk_code)        ((GetAsyncKeyState(vk_code) & 0x8000) ? 0:1)//全局变量HWND main_window_handle = NULL;HINSTANCE hInstance_App = NULL;char buffer[80];//窗口处理函数LRESULT CALLBACK WindowProc(HWND hwnd,    UINT msg,    WPARAM wParam,    LPARAM lPram){    PAINTSTRUCT ps;    HDC hdc;    RECT rect;    char buffer[80];    switch (msg)    {    case WM_CREATE:    {                      return 0;    }break;    case WM_PAINT:    {                     hdc = GetDC(hwnd);                     ReleaseDC(hwnd, hdc);                     GetClientRect(hwnd, &rect);                     ValidateRect(hwnd, &rect);                     return 0;    }break;    case WM_CLOSE:    {                     if (IDYES != MessageBox(hwnd, "确实要退出应用程序？", "退出", MB_YESNO | MB_ICONEXCLAMATION))                     {                         return 0;                     }                     else                     {                         PostQuitMessage(0);                     }    }break;    case WM_SIZE:    {    }break;    case WM_DESTROY:    {                       PostQuitMessage(0);                       return 0;    }break;    default:break;    }    return DefWindowProc(hwnd, msg, wParam, lPram);}void GameMain(){    return;}int WINAPI WinMain(HINSTANCE hInstance,    HINSTANCE hPrevInstance,    LPSTR lpCmdLine,    int nCmdShow){    //定义窗口类    WNDCLASSEX winClass;    HWND hWnd;    MSG msg;    HPEN pen = NULL;    int color_change_count = 100;    //填充窗口类的各成员    winClass.cbSize = sizeof(WNDCLASSEX);    winClass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;    winClass.lpfnWndProc = WindowProc;    //窗口消息处理函数    winClass.cbClsExtra = 0;    winClass.cbWndExtra = 0;    winClass.hInstance = hInstance;    winClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);    winClass.hCursor = LoadCursor(NULL, IDC_ARROW);    winClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);    winClass.lpszMenuName = NULL;    winClass.lpszClassName = WINDOW_CLASS_NAME;        //窗口类名    winClass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);    //保存实例句柄到全局变量    hInstance_App = hInstance;    //注册窗口类    if (!RegisterClassEx(&winClass))    {        return 0;    }    //创建窗口类的一个成员    if (!(hWnd = CreateWindowEx(NULL,        WINDOW_CLASS_NAME,        "时间锁定的屏幕保护程序",        WS_OVERLAPPEDWINDOW | WS_VISIBLE,        200, 200,        WINDOW_WIDTH, WINDOW_HEIGHT,        NULL,        NULL,        hInstance,        NULL)))    {        return 0;    }    //保存窗体句柄到全局变量中    main_window_handle = hWnd;    //得到设备上下文    HDC hdc = GetDC(hWnd);    //设置随机数生成器的种子    srand(GetTickCount());    //线段终点坐标    int x1 = rand() % WINDOW_WIDTH;    int y1 = rand() % WINDOW_HEIGHT;    int x2 = rand() % WINDOW_WIDTH;    int y2 = rand() % WINDOW_HEIGHT;    //线段终点的速度    int x1v = -4 + rand() % 8;    int y1v = -4 + rand() % 8;    int x2v = -4 + rand() % 8;    int y2v = -4 + rand() % 8;    //消息循环    while (TRUE)    {        DWORD start_time = GetTickCount();        if (PeekMessage(&msg, hWnd, 0, 0, PM_REMOVE))        {            if (msg.message == WM_QUIT)            {                break;            }            TranslateMessage(&msg);            DispatchMessage(&msg);        }        //100次变换一次颜色        if (++color_change_count >= 100)        {            color_change_count = 0;            if (pen)            {                DeleteObject(pen);            }            pen = CreatePen(PS_SOLID, 1, RGB(rand() % 256, rand() % 256, rand() % 256));            SelectObject(hdc, pen);        }        //移动线段终点        x1 += x1v;        y1 += y1v;        x2 += x2v;        y2 += y2v;        //碰撞检测，看是否碰到窗体的边界        if (x1<0 || x1>WINDOW_WIDTH)        {            x1v = -x1v;            x1 += x1v;        }        if (y1<0 || y1>WINDOW_HEIGHT)        {            y1v = -y1v;            y1 += y1v;        }        if (x2<0 || x2>WINDOW_WIDTH)        {            x2v = -x2v;            x2 += x2v;        }        if (y2<0 || y2>WINDOW_HEIGHT)        {            y2v = -y2v;            y2 += y2v;        }        MoveToEx(hdc, x1, y1,NULL);        LineTo(hdc, x2, y2);        //锁定帧率为30fps,1/30秒，约等于33毫秒。        while (GetTickCount() - start_time < 33);        //如果用户按了ESC，发送WM_CLOSE消息。退出程序。        if (KEYDOWN(VK_ESCAPE))            SendMessage(hWnd, WM_CLOSE, 0, 0);    }    ReleaseDC(hWnd, hdc);    return msg.wParam;}