delphi - Why are memory leaks reported for Indy 10?

Question

I have this leak in Indy 10.5.7 (under Delphi 7).

5 - 12 bytes: TIdThreadSafeInteger x 1
21 - 36 bytes: TIdCriticalSection x 2

---

I use Indy like this:

function getWeb(a,b:Integer):Integer;
var url: string;
    H: TIdHttp;
    SS: TStringStream;
begin
  url := 'http://blabla';
  H := TIdHttp.Create(nil);
  try
    SS := TStringStream.Create('');
    try
      H.Get(url, SS);
      Result := StrToInt(SS.DataString);
    FINALLY
     SS.Free;
    END;
  finally H.Free;
  end;

The leak itself doesn't bother me since is on app shutdown. That makes my melon explode is the error message I see every time I shut down the app.

Why this leak appear?

---

I have checked the Indy web site but it barely makes sense. Anyway, it looks this bug cannot be fixed: the latest version of Indy cannot be compiled with Delphi 7. The only solution might be Indy 9. Update: it looks like what on the web site calls v10.203 is is actually v10.2.3.

Answer 1

This is a problem that occurs with FastMM memory manager and has been around for a while and there is a lot of information available on fixes. The solution I use in Delphi 2010 is:

1. Make the changes below to the file IdGlobal.pas
2. Add the path "C:Program FilesEmbarcaderoRAD Studio7.0sourceIndyIndy10System" (without quotes) to the library.

Changes:

{$IFNDEF DOTNET}
  {$IFDEF REGISTER_EXPECTED_MEMORY_LEAK}
function IndyRegisterExpectedMemoryLeak(AAddress: Pointer): Boolean;
{$IFDEF USEINLINE}inline;{$ENDIF}
begin

  // ===== My modification begins =====================

    Result := FastMM4.RegisterExpectedMemoryLeak(AAddress);
    Exit;


  // ===== My modification ends =====================

Hope this helps.