//Листинг 3.1. Крестики-нолики

//
LRESULT CALLBACK	ChildProc(HWND, UINT, WPARAM, LPARAM);
TCHAR ChildClassName[MAX_LOADSTRING] = _T("WinChild");
ATOM MyRegisterChildClass()
{
	WNDCLASSEX wcex  = { 0 };
	wcex.cbSize      = sizeof(WNDCLASSEX);
	wcex.lpfnWndProc = ChildProc;
	wcex.hInstance   = hInst;
	wcex.hCursor     = LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);

	wcex.lpszClassName = ChildClassName;
	return RegisterClassEx(&wcex);
}
static HFONT newFont;
static HWND hChild[9];
unsigned char k[9] = { 0 };
char text[] = { ' ', 'X', '0' };
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM
	lParam)
{ 
	int i;
	static int sx, sy;
	switch (message)
	{
	case WM_CREATE:
		MyRegisterChildClass();
		for (i = 0; i < 9; i++)
			hChild[i] = CreateWindow(ChildClassName, NULL, WS_CHILD |
			WS_DLGFRAME | WS_VISIBLE, 0, 0, 0, 0, hWnd, NULL, hInst, NULL);
		break;
	case WM_SIZE:
		if (wParam == SIZE_MINIMIZED) break; // Кнопка свертывания окна
		sx = LOWORD(lParam)/3;        //Ширина дочернего окна
		sy = HIWORD(lParam)/3;        //Высота дочернего окна
		if (newFont) DeleteObject(newFont);
		newFont = CreateFont(min(sx,sy), 0, 0, 0, FW_NORMAL, 0, 0, 0,
		DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
		DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, _T("Arial"));
		for (i = 0; i < 9; i++)
		  { MoveWindow(hChild[i],(i%3)*sx, (i/3)*sy, sx, sy, TRUE);
		    UpdateWindow(hChild[i]);
		  }
      break;
	case WM_COMMAND: 
		switch (LOWORD(wParam))
		{
		case ID_NEW:
			for (i = 0; i < 9; i++)
			{
				k[i] = 0;
				InvalidateRect(hChild[i], NULL, 1);
				UpdateWindow(hChild[i]);
			}

         break;
		case IDM_EXIT: DestroyWindow(hWnd);	break;
		default: return DefWindowProc(hWnd, message, wParam, lParam);
		} 
		break; 
	case WM_DESTROY: PostQuitMessage(0); break;
	default: return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}
///////////////////////////////////////////////////////////////////
LRESULT CALLBACK ChildProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM
	lParam)
{ 
   PAINTSTRUCT ps;
   HDC hdc;
   RECT rt;
   int i, s;
   char *ch;
   switch (message)
   {
   case WM_LBUTTONDOWN :
	   for (i = 0; hWnd != hChild[i]; i++);
	   if (k[i]) break; else k[i] = 1;
	   InvalidateRect(hWnd, NULL, 1);
	   UpdateWindow(hWnd);
	   srand(lParam);
	   for (i = s = 0; i< 9; i++) if (k[i]) s++;
	   if(s == 9) MessageBox(hWnd, _T("Для следующего сеанса выбирайте\
		New"), _T("Конец игры"), MB_OK | MB_ICONQUESTION);
	   else
	   {
		   while(true)
		   { s = rand()*9/(RAND_MAX+1);
		     if (k[s]) continue;
			 k[s] = 2;
             InvalidateRect(hChild[s], NULL, 1);
			 UpdateWindow(hChild[s]);
			 break;
		   }
	   }
	   break;
	case WM_PAINT:

		for (i = 0; hWnd != hChild[i]; i++);
		if(k[i])
		{
			ch = text+k[i];
			hdc = BeginPaint(hWnd, &ps);
			GetClientRect(hWnd, &rt);
			SelectObject(hdc, newFont);
			DrawTextA(hdc,ch,1,&rt,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
            EndPaint(hWnd, &ps);
		}   //Фоновая закраска окна
		else DefWindowProc(hWnd, message, wParam, lParam);
		break;
	default: return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}