Der XE8 Fehler-Thread

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[MacOS] FMX ScreenReader can crash the application! (berichtet am 11.02.2015)

In FMX.ScreenReader.MAC.pas the is a global variable "FocusedCtrl".
If a second form is shown & freed, the variable FocusedCtrl can point to a control which has already been freed.

In various places the variable is accessed and can be a dangling pointer -> BUUUM

Workaround in FMX.ScreenReader.MAC.pas:

markieren

Code:

			destructor TAccForm.Destroy;

var

  MyControl: TFmxObject;

begin

  FEditTimer.Free;

  FEditMouseUp.Free;

  // Make sure freed form has no longer reference to control

  MyControl:= FocusedCtrl;

  while Assigned(MyControl) do

    begin

      if (MyControl is TForm) and ((MyControl as TForm) = Self) then

        begin

          FocusedCtrl:= nil;

          Break;

        end;

      MyControl:= MyControl.Parent;

    end;

  inherited;

end;

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