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PODelphi application leaking AnsiStrings
 

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  1. PODelphi application leaking AnsiStrings
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    <p>According to FastMM4, the Delphi program I'm working on at the moment is leaking a lot strings. AnsiStrings to be precise:</p> <p><img src="https://i.stack.imgur.com/287c9.png" alt="enter image description here"></p> <p>The application (<a href="http://sourceforge.net/projects/orwelldevcpp/" rel="noreferrer">http://sourceforge.net/projects/orwelldevcpp/</a>) used to leak a lot more other data types, but FastMM4 could report where the instance was created, so I managed to fix that. The strange thing is that FastMM4 doesn't report locations of these leaks at all.</p> <p><strong>Edit: it seems it does after all, see answers for the fix. Anyways, the question still stands: how in the world am I leaking these things?</strong></p> <p>So, ehm, unfortunately, I've got no idea what to look for. I mean, if these things go out of scope, they should be automatically freed right (even though they're on the heap)?</p> <p>I did manage to track a few leaks down by random commenting and seeing what would happen to the counts. Here's an example:</p> <pre><code>// simply passing it a constant creates a leak... MainForm.UpdateSplash('Creating extra dialogs...'); procedure TMainForm.UpdateSplash(const text : AnsiString); begin if not devData.NoSplashScreen then // even if this branch is NOT taken SplashForm.Statusbar.SimpleText := 'blablabla' + text; end; // And even if the function call itself is placed within a NOT taken branch! </code></pre> <p>Here's another example of a leak:</p> <pre><code>// Passing this constants produces leaks... procedure TCodeInsList.AddItemByValues(const a, b, c: AnsiString;...); var assembleditem : PCodeIns; begin new(assembleditem); assembleditem^.Caption:=a; assembleditem^.Line:=b; assembleditem^.Desc:=c; ... fList.Add(assembleditem); end; // ... even when calling this on WM_DESTROY! destructor TCodeInsList.Destroy; var I: integer; begin for I := 0 to fList.Count - 1 do Dispose(fList[I]); fList.Free; inherited Destroy; end; // produces leaks!? </code></pre> <p>There are quite a bunch of string leak questions here, but none really clarify <strong>what patterns one should look for</strong>. Google doesn't provide either.</p> <p><strong>Edit: so, I have to look for passed constants. But why?</strong></p> <p><strong>So ehm, any ideas?</strong></p>
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    1. COI can't get the sourceforge project to load at the moment. Is there any possibility that the main form is not being destroyed properly and hence leaving dangling strings? Would that do it?
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    2. COdelphi version? If you can, test with aqtime it will tell you exactly where the leak is.
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    3. CO@RichardA: As you can see in source\devcpp.dpr, the splashform is freed using 'Free'. Will try adding caFree to the OnClose event.<crlf> @ Warren: I highly doubt aqtime will be able to tell me more than FastMM4, gpProfiler and MemCheck. And I need to upgrade to XE too for aqtime (using D7 now). My university does have a D2009 license floating around somewhere (not for EE folks like me though), but aqtime doesn't even support that it seems.
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