Why AV happen here

[stacker_liew 5]

Anyone can help to look for the code? What is the reason av is happen when the login frame is shown, and Back key is click av triggered.

TFrameStandDemo.7z

[programmerdelphi2k 235]

@stacker_liew 

if any "AV" is been raised, when you:

• trying to access an object that was never created in memory;
• trying to access an object that no longer exists in memory;

 

[Dave Nottage 493]

1 hour ago, stacker_liew said:

What is the reason av is happen when the login frame is shown

This is the code:

unit utTFrameStandDemoLoginFrame;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  FMX.Types, FMX.Graphics, FMX.Controls, FMX.Forms, FMX.Dialogs, FMX.StdCtrls,
  FMX.Controls.Presentation, FMX.Objects, FMX.Effects, FrameStand;

type
  TTFrameStandDemoLoginFrame = class(TFrame)
    TFrameStandDemoLoginFrameRectangle: TRectangle;
    TFrameStandDemoLoginFrameToolBar: TToolBar;
    TFrameStandDemoLoginFrameToolBarShadowEffect: TShadowEffect;
    TFrameStandDemoLoginFrameToolBarLabel: TLabel;
    TFrameStandDemoLoginFrameToolBarBackSpeedButton: TSpeedButton;
    procedure TFrameStandDemoLoginFrameToolBarBackSpeedButtonClick(Sender: TObject);
  private
    { Private declarations }
    [FrameInfo]
    FInfo: TFrameInfo<TTFrameStandDemoLoginFrame>;
  public
    { Public declarations }
  end;

implementation

{$R *.fmx}

procedure TTFrameStandDemoLoginFrame.TFrameStandDemoLoginFrameToolBarBackSpeedButtonClick(Sender: TObject);
begin
  FInfo.HideAndClose;
end;

I expect it's because FInfo is not being created

[stacker_liew 5]

But it's ok in the first frame but not in the second frame.

[stacker_liew 5]

On 1/18/2023 at 6:37 PM, stacker_liew said:

But it's ok in the first frame but not in the second frame.

Finally I managed to solve this problem, by using different FrameStand for different Frame.

TFrameStandDemo.7z