通过分配Image1.Ficture来清除图像：= nil;造成内存泄漏？ [英] Does clearing an image by assigning Image1.Picture := nil; cause a memory leak?

问题描述

我在这里阅读过 http://delphi.about.com/od/ adimips2005 / qt / cleartimage.htm ，一种从TImage中清除图像的方法是将零分配给 .Picture ，如下所示：

  Image1.Picture：= nil; 
  

我只想确定...我猜，$ code Image1.Picture .loadFromFile（fileName）将分配一些内存，只需将其设置为nil，而不释放内存，将导致内存泄漏。

我对么？如果是这样，从TImage中卸载和清除图像的正确方式是什么？

解决方案

TImage.Picture setter is TImage.SetPicture（）在 ExtCtrls 单元，在 Graphics 单元中调用 TPicture.Assign（），调用 TPicture。在分配新的图形之前，SetGraphic（）将释放现有的图形 / p>

所以使用

  Image1.Picture：= nil; 
  

最终会调用

  Image1.Picture.SetGraphic（nil）; 
  

不会造成内存泄漏。

I have read here http://delphi.about.com/od/adptips2005/qt/cleartimage.htm that a way to clear an image from a TImage is to assign nil to .Picture, like this:

Image1.Picture := nil;

I just want to be sure... I guess the Image1.Picture.loadFromFile(fileName) will allocate some memory and simply setting it to nil, without freeing the memory, will lead to a memory leak.

Am I correct? If this is so, which is the "proper" way to unload and clear an image from a TImage?

解决方案

The TImage.Picture setter is TImage.SetPicture() in the ExtCtrls unit, which calls TPicture.Assign() in the Graphics unit, which calls TPicture.SetGraphic(), which will free an existing Graphic before assigning a new Graphic.

So the usage of

Image1.Picture := nil; 

Will ultimately call

Image1.Picture.SetGraphic(nil); 

And will not cause any memory leak.

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