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Subscription => Support => Topic started by: Dany on August 11, 2018, 02:19:56 PM


Title: Strange memory leak after connection exception
Post by: Dany on August 11, 2018, 02:19:56 PM
Hello again!

I have an ... where do i attach files to a topic??!! Ok ... i have a small MVP that behaves strangely.
Seems i cannot attach a zip in this forum, the code is pasted below, .dpr, .dfm and .pas.

I can click the first three buttons to my hearts content and terminate the application. Good.
If i click the fourth button (arg... that's Button3 not Button4, sorry), there is a memory leak reported when the application terminates.

The fourth server is behind a firewall. I'm not sure about the dns name, if it can be looked up outside of that firewall.

Any insights would be appreciated!

/D

Code:
program Project11;

uses
  Vcl.Forms,
  Unit19 in 'Unit19.pas' {Form19};

{$R *.res}

begin
  ReportMemoryLeaksOnShutdown := true;

  Application.Initialize;
  Application.MainFormOnTaskbar := True;
  Application.CreateForm(TForm19, Form19);
  Application.Run;
end.

...

Code:
object Form19: TForm19
  Left = 0
  Top = 0
  Caption = 'Form19'
  ClientHeight = 45
  ClientWidth = 530
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
    Left = 8
    Top = 8
    Width = 75
    Height = 25
    Caption = 'localhost'
    TabOrder = 0
    OnClick = Button1Click
  end
  object Button2: TButton
    Left = 89
    Top = 8
    Width = 75
    Height = 25
    Caption = 'IP 10.0.2.2'
    TabOrder = 1
    OnClick = Button2Click
  end
  object Button3: TButton
    Left = 383
    Top = 8
    Width = 130
    Height = 25
    Caption = 'smrihs02.ekuc.se'
    TabOrder = 2
    OnClick = Button3Click
  end
  object Button4: TButton
    Left = 170
    Top = 8
    Width = 207
    Height = 25
    Caption = 'big site of extremely commercial paper'
    TabOrder = 3
    OnClick = Button4Click
  end
  object rhcMain: TRtcHttpClient
    ServerAddr = 'localhost'
    ServerPort = '81'
    ReconnectOn.ConnectError = True
    ReconnectOn.ConnectLost = True
    ReconnectOn.ConnectFail = True
    AutoConnect = True
    Left = 14
    Top = 13
  end
  object cmMain: TRtcClientModule
    AutoSyncEvents = True
    Client = rhcMain
    Compression = cDefault
    AutoSessionMode = rsm_Cookie
    ObjectLinks = ol_AutoClient
    AutoSessions = True
    ModuleFileName = '/mytest'
    Left = 53
    Top = 14
  end
end

...

Code:
unit Unit19;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, rtcSystem, rtcInfo, rtcConn, rtcDataCli, rtcHttpCli, rtcCliModule;

type
  TForm19 = class(TForm)
    rhcMain: TRtcHttpClient;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    cmMain: TRtcClientModule;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form19: TForm19;

implementation

{$R *.dfm}

procedure TForm19.Button1Click(Sender: TObject);
begin
  rhcMain.ServerAddr := 'localhost';
  rhcMain.ServerPort := '80';

  cmMain.Prepare('hello');
  cmMain.Execute;
end;

procedure TForm19.Button2Click(Sender: TObject);
begin
  rhcMain.ServerAddr := '10.0.2.2';
  rhcMain.ServerPort := '81';

  cmMain.Prepare('hello');
  cmMain.Execute;
end;

procedure TForm19.Button4Click(Sender: TObject);
begin
  rhcMain.ServerAddr := 'www.aftonbladet.se';
  rhcMain.ServerPort := '443';

  cmMain.Prepare('hello');
  cmMain.Execute;
end;

procedure TForm19.Button3Click(Sender: TObject);
begin
  rhcMain.ServerAddr := 'smrihs02.ekuc.se';
  rhcMain.ServerPort := '443';

  cmMain.Prepare('hello');
  cmMain.Execute;
end;

end.

Title: Re: Strange memory leak after connection exception
Post by: D.Tkalcec (RTC) on August 11, 2018, 05:51:43 PM
Close the connection (call rhcMain.DisconnectNow) before you close the Application - for example, from your Main Form's "OnCloseQuery" event.

Title: Re: Strange memory leak after connection exception
Post by: Dany on August 12, 2018, 09:16:30 AM
I changed the code to below. Just added an OnCloseQuery handler...

Code:
CanClose := rhcMain.DisconnectNow = wait_OK;

...but i get the same result  ??? !

Could you take another look?

Apologies if i am being daft.

/D

Code:
object Form19: TForm19
  Left = 0
  Top = 0
  Caption = 'Form19'
  ClientHeight = 45
  ClientWidth = 530
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  OnCloseQuery = FormCloseQuery
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
    Left = 8
    Top = 8
    Width = 75
    Height = 25
    Caption = 'localhost'
    TabOrder = 0
    OnClick = Button1Click
  end
  object Button2: TButton
    Left = 89
    Top = 8
    Width = 75
    Height = 25
    Caption = 'IP 10.0.2.2'
    TabOrder = 1
    OnClick = Button2Click
  end
  object Button3: TButton
    Left = 383
    Top = 8
    Width = 130
    Height = 25
    Caption = 'smrihs02.ekuc.se'
    TabOrder = 2
    OnClick = Button3Click
  end
  object Button4: TButton
    Left = 170
    Top = 8
    Width = 207
    Height = 25
    Caption = 'big site of extremely commercial paper'
    TabOrder = 3
    OnClick = Button4Click
  end
  object rhcMain: TRtcHttpClient
    ServerAddr = 'localhost'
    ServerPort = '81'
    ReconnectOn.ConnectError = True
    ReconnectOn.ConnectLost = True
    ReconnectOn.ConnectFail = True
    AutoConnect = True
    Left = 14
    Top = 13
  end
  object cmMain: TRtcClientModule
    AutoSyncEvents = True
    Client = rhcMain
    Compression = cDefault
    AutoSessionMode = rsm_Cookie
    ObjectLinks = ol_AutoClient
    AutoSessions = True
    ModuleFileName = '/mytest'
    Left = 53
    Top = 14
  end
end

and

Code:
unit Unit19;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, rtcSystem, rtcInfo, rtcConn, rtcDataCli, rtcHttpCli, rtcCliModule;

type
  TForm19 = class(TForm)
    rhcMain: TRtcHttpClient;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    cmMain: TRtcClientModule;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form19: TForm19;

implementation

uses
  rtcThrPool;

{$R *.dfm}

procedure TForm19.Button1Click(Sender: TObject);
begin
  rhcMain.ServerAddr := 'localhost';
  rhcMain.ServerPort := '80';

  cmMain.Prepare('hello');
  cmMain.Execute;
end;

procedure TForm19.Button2Click(Sender: TObject);
begin
  rhcMain.ServerAddr := '10.0.2.2';
  rhcMain.ServerPort := '81';

  cmMain.Prepare('hello');
  cmMain.Execute;
end;

procedure TForm19.Button4Click(Sender: TObject);
begin
  rhcMain.ServerAddr := 'www.aftonbladet.se';
  rhcMain.ServerPort := '443';

  cmMain.Prepare('hello');
  cmMain.Execute;
end;

procedure TForm19.Button3Click(Sender: TObject);
begin
  rhcMain.ServerAddr := 'smrihs02.ekuc.se';
  rhcMain.ServerPort := '443';

  cmMain.Prepare('hello');
  cmMain.Execute;
end;

procedure TForm19.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
  CanClose := rhcMain.DisconnectNow = wait_OK;
end;

end.


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