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#include 
     
      LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);//回调函数;int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrev, LPSTR lpCmdLine, int nCmdShow){    WNDCLASS wndclass;//窗口类;    MSG msg;    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 = L"Window窗口创建";  //窗口类名称    if (!RegisterClass(&wndclass))//注册窗口;    {        MessageBox(NULL, L"创建失败", L"error", MB_OK);        return false;    }    HWND hwnd = CreateWindow(    //创建窗口，返回句柄;        L"Window窗口创建",  //1.窗口类名称        L"window窗口创建",  //2.窗口标题        WS_OVERLAPPEDWINDOW, //3.窗口风格        CW_USEDEFAULT,  //4.窗口左上角相对于屏幕左上角的初始x坐标        CW_USEDEFAULT,  //5.窗口左上角相对于屏幕左上角的初始y坐标        CW_USEDEFAULT,  //6.窗口宽度        CW_USEDEFAULT,  //7.窗口高度        NULL,           //8.一个子窗口的父窗口的句柄，或隶属窗口的拥有者窗口的句柄，若没有拥有者窗口或者父窗口，置为NULL;        NULL,           //9.选单句柄        hInstance,      //10.创建窗口对象的应用程序的实例句柄        NULL            //11.创建窗口的额外参数        );    ShowWindow(hwnd, nCmdShow);//显示窗口;    UpdateWindow(hwnd);//更新窗口;    while (GetMessage(&msg, NULL, 0, 0)) //消息循环;    {        TranslateMessage(&msg);        DispatchMessage(&msg);    }    return msg.wParam;}LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){    switch (message)    {    case WM_PAINT:        HDC hdc;        PAINTSTRUCT ps;        hdc = BeginPaint(hwnd, &ps);        TextOut(hdc, 20, 20, L"Window OK!", 10);        EndPaint(hwnd, &ps);        return 0;    case WM_DESTROY:        PostQuitMessage(0);        return 0;    }    return DefWindowProc(hwnd, message, wParam, lParam);}