TPyDelphiWrapper and initialization/finalization issue

[Jacek Laskowski 57]

I have code that gets an initialized python engine and creates a wrapper around TMemoryStream for its needs:

 

procedure TMainForm.MainTest(PyEngine: TPythonEngine; PyModule: TPythonModule);
var
  Stream: TMemoryStream;
  PyStream: PPyObject;
  PyDelphiWrapper: TPyDelphiWrapper;
begin
  Stream := TMemoryStream.Create();
  PyDelphiWrapper := TPyDelphiWrapper.Create(nil);
  try
    PyDelphiWrapper.Engine := PyEngine;
    PyDelphiWrapper.Module := PyModule;
    PyDelphiWrapper.Initialize; <-- generates an exception on the next execution, when previously there was an error in the python runtime (ExecString)

    PyStream := PyDelphiWrapper.Wrap(Stream, soReference);
    try
      PyModule.SetVar('streamOut', PyStream);
    finally
      PyEngine.Py_DecRef(PyStream);
    end;

    try
      PyEngine.ExecStrings(fSrcLines, 'delphibridge'); <--- Problem starts when any error in python syntax generates an exception here
      Stream.SaveToFile(edtOutputXML.Text);
    finally
      PyEngine.Py_IncRef(PyEngine.Py_None);
      PyModule.SetVar('streamOut', PyEngine.Py_None);
    end;
  finally
    PyDelphiWrapper.Free;
    Stream.Free;
  end;
end;

And now the problem is that when there is no error in the Python script then I can call this method repeatedly without any problem.
However, when there is an exception in the Python runtime then calling this method again throws a serious error already at the PyDelphiWrapper.Initialize line:

 

ExceptionMessage="Access violation at address 67012FDA. Read of address 00000054"
ExceptionName="EAccessViolation"
ExceptionDisplayName="$C0000005"

 

I'm guessing that I have some problem here with the correct management of TPyDelphiWrapper object (finalization?), but I can't understand what is the reason. Please give me a hint.

Edited 7 hours ago by Jacek Laskowski

[pyscripter 796]

There is no need to create and destroy TPyDelphiWrapper.   Just create it once with the engine.  It will be automatically initialized when the python dll is loaded.

[Jacek Laskowski 57]

32 minutes ago, pyscripter said:

There is no need to create and destroy TPyDelphiWrapper.   Just create it once with the engine.  It will be automatically initialized when the python dll is loaded.

And can I use one instance of TPyDelphiWrapper for multiple delphi objects in different python scripts?

[pyscripter 796]

2 hours ago, Jacek Laskowski said:

And can I use one instance of TPyDelphiWrapper for multiple delphi objects in different python scripts?

Yes you can.