如何检测tfilestream是否已释放？

本文介绍了如何检测tfilestream是否已释放？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

是否有办法查看是否正在使用tfile流实例？例如，如果我声明了类型为tfilestream的FS的，则向其写入缓冲区，然后最终使用tfilestream.free释放流。我可以检查一下吗？

is there a way to see if an instace of tfile stream is being used? for example if i declare FS of type tfilestream,write buffer to it and finally free the stream using tfilestream.free can i check something like:

if tfilestream.NotActive then //code if tfilestream.beingused then //code if tfilestream.free = true then //code

active 和 beingused 方法不存在，我们也无法测试 tfilestream.free = true 只是为了弥补这一点，以了解我要问的问题

active and beingused methods do not exists for real nor can we test tfilestream.free = true just making this up to give idea what i am trying to ask

推荐答案

您无法以预期的方式进行操作。但是您可以使用 FreeAndNil（）

You can't do it in the way you expect. But you and do it with FreeAndNil()

var FS : TFileStream; begin FS := TFileStream.Create(...); try // Do Work with TFileSTream finally FreeAndNil(FS); end; // For some reason you need to check FS is freed. if not Assigned(FS) then begin // Stream was freed. end; end;