Ergebnis der Suchanfrage

• Forum: Sonstige Fragen zu Delphi

  AW: Delphi 12: Fehler mit Action := caFree

    Delphi
    by peterbelow, 5. Dez 2023
  The mouse button down and up messages are posted messages (by the OS), are retrieved (GetMessage/PeekMessage API) and processed (DispatchMessage API) by ProcessMessage. TButton is a wrapper aound the Windows BUTTON control and that reacts to the dispatched mouse messages by sending (not posting) a BN_CLICKED notification to its parent. The VCL reflects that back to the TButton control and there...
• Forum: Sonstige Fragen zu Delphi

  AW: Delphi 12: Fehler mit Action := caFree

    Delphi
    by peterbelow, 4. Dez 2023
  You seem to have a serious misunderstanding of how the call stack works. In a VCl app practically all code in the main thread is executed in response to a posted message, so the base of the call stack is TApplication.ProcessMessage, at least all the code flow interesting for debugging starts from there. There are a few instruction below that point, which get executed during program startup. but...
• Forum: Sonstige Fragen zu Delphi

  AW: Delphi 12: Fehler mit Action := caFree

    Delphi
    by peterbelow, 3. Dez 2023
  The problem itself is a bug, no argument. But the debugger is not faulty, the stack is not corrupted. It correctly reports the location at which the exception was raised. That is just not the location that is at the root of the problem, but that is fairly often the case.
• Forum: Sonstige Fragen zu Delphi

  AW: Delphi 12: Fehler mit Action := caFree

    Delphi
    by peterbelow, 3. Dez 2023
  If I let the IDE break on the exception the call stack does look like in original post:
  
  Vcl.Forms.TCustomForm.VisualManager_AcceptMessage((45089, 0, 0, 0, 0, 0, (), 0, 0, (), 0, 0, ()))
  Vcl.Forms.TCustomForm.WndProc((9960336, 9960352, 9960168, 9960168, 64416, 151, (), 64232, 151, (), 64232, 151, ()))
  Vcl.Controls.TWinControl.MainWndProc(???)
  System.Classes.StdWndProc(721212,45089,0,0)...
• Forum: Sonstige Fragen zu Delphi

  AW: Delphi 12: Fehler mit Action := caFree

    Delphi
    by peterbelow, 2. Dez 2023
  If I run to a breakpoint in the OnClose handler the full call stack looks like this
  
  Unit2.TForm2.FormClose($7F650010,caHide)
  Vcl.Forms.TCustomForm.DoClose(???)
  Vcl.Forms.TCustomForm.Close
  Unit2.TForm2.Button1Click($3157C10)
  Vcl.Controls.TControl.Click
  Vcl.StdCtrls.TCustomButton.Click
  Vcl.StdCtrls.TCustomButton.CNCommand(???)
  Vcl.Controls.TControl.WndProc((48401, 1634, 591458, 0, 1634,...
• Forum: Sonstige Fragen zu Delphi

  AW: Delphi 12: Fehler mit Action := caFree

    Delphi
    by peterbelow, 2. Dez 2023
  Ich kann das Problem in D12 reproduzieren, nur die Fehleradressen sind nicht immer gleich. Das ist ein echter Bug, der beim Implementieren des verbesserten MDI-Supports in TCustomForm.WndProc eingebaut wurde, siehe Post #9 in diesem Thread.
  
  Bitte sei so nett und lege einen Bugreport mit deinem Beispielprogramm auf quality.embarcadero.com an.
• Forum: Sonstige Fragen zu Delphi

  AW: Delphi 12: Fehler mit Action := caFree

    Delphi
    by peterbelow, 2. Dez 2023
  In D12 they completely reworked the support for MDI UIs to allow all the modern features users expect on Win 10 and 11. There probably are a lot of legacy MDI programs around that are in dire need of updating and from Embarcadero customers with some clout :wink:...
  
  This Visual manager thing was appearendly introduced to implement this support, but they introduced a bug in the process as well....