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    <p>If you are leaking 115 instances of that class, then it is <em>that class</em> that is being leaked. The memory occupied by that class, not the memory occupied by the things it refers to, is being leaked. Somewhere, you have 115 instances of <code>TCwcBasicAdapter</code> that you're not freeing.</p> <p>Furthermore, <em>properties</em> don't store data, no matter they're interfaces or some other type. Only fields occupy memory (along with some hidden space the compiler allocates on the class's behalf).</p> <p>So, yes, you are barking up the wrong tree. Your memory leak is somewhere else. When FastMM tells you that you have a memory leak, doesn't it also tell you where each leaked instance was allocated. It has that capability; you might need to adjust some conditional-compilation symbols to enable that feature.</p> <p>Surely it's not <em>only</em> instances of that class that are leaking, though. FastMM should also report some other things leaking, such as instances of the class or classes that implement the interface.</p> <hr> <p>Based on the function you added, I've begun to suspect that it's really <code>TCwcCDSAdapterNavBase</code> that's leaking, and that could be because of the atypical way you use for creating it. Does the exception handler in <code>GetAdapterNav</code> ever run? I doubt it; <code>TObject.GetInterface</code> never explicitly raises an exception. If the object doesn't support the interface, it returns <code>False</code>. All that exception handler could catch are things like access violation and illegal operations, which you really shouldn't be catching there anyway.</p> <p>You can implement that function more directly like this:</p> <pre><code>if Assigned(FDataSet) then Result := TCwcCDSAdapterNavBase.Create(...); </code></pre>
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    1. PODelphi 2009 - Can an Interface Property Cause a Memory Leak?
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    1. USRob Kennedy
    1. USRob Kennedy
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    1. COLooks like he's already getting the log file about what's being leaked. But the relation between knowing where it gets constructed and knowing when to destroy it is not always a simple or obvious one.
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      1. USMason Wheeler
    2. COIf you know who created the leaked objects, then that often tells you who's supposed to be responsible for freeing them. And I know he already has the log about leaks. But I'm suggesting that maybe he hasn't looked at the whole log since it's unlikely that just instances of that one class have leaked. The things the class allocated for itself probably also leaked, as well as the objects those interface references point to. And finally, the main point is that the interface property cannot be the cause of the leaked instances of that class.
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      1. USRob Kennedy
    3. COThe FastMM4 report references the leaked class' creation, where it is added to a TObjectList member of a TObject descendant. The TObjectList is created as not Owning, and is FreeAndNil in the class' destructor after a for loop calling Remove on its Items. The frustrating part is all that is happening as expected.
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      1. USuser122603
 

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