可以实现文件的常规操作,如打开,新建,保存,移动，复制,连铁,如果你喜欢的话可以加以修改,能很轻松的实现画图功能-can achieve the conventional documents, such as the opening, the new, preservation, move, copy, and even iron, If you feel like it can be adapted very easily to the realization of drawing funct