如何检测tfilestream是否已被释放？

发布于 2024-09-12 04:15:10 字数 395 浏览 5 评论 0原文

有没有办法查看 tfile 流的实例是否正在使用？例如，如果我声明 tfilestream 类型的 FS，则向其写入缓冲区并最后使用 tfilestream.free 释放流我可以检查一些东西吗例如：

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

active 和 beingused 方法并不真实存在，我们也无法测试 tfilestream.free = true 只是编造这个来了解我的意思我想问

原文

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 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

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ヤ经典坏疍 2024-09-19 04:15:10

你不能按照你期望的方式去做。但你可以用 FreeAndNil() 来实现

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;

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;

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