Delphi 表单控件内存泄漏

Question

我在新分配到的项目中发现了一个奇怪的内存泄漏。

终止时，程序显示以下 FastMM4 错误消息。

项目使用BusinessSkinForm

TbsaSpeedButtonSubClass 来自第三方 BusinessSkinForm 库，但是该窗体上的速度按钮似乎是常规的 VCL 窗体控件。

当我在表单中添加另一个速度按钮时，

我现在有 25 个 TbsaSpeedButtonSubClass 实例泄漏，而不是 24 个。

这让我认为泄漏是由于 TSpeedButton。然而，这对我来说似乎很奇怪，因为我希望表单组件在销毁时被表单自动释放。

也许 BusinessSkinForm 对表格做了一些不寻常的事情导致泄漏...

我不确定如何摆脱这个漏洞

编辑

感谢 KenWhite，我收到了来自 FastMM4 的内存泄漏报告

Here it is on Pastebin

编辑

如堆栈跟踪所示，问题可以追溯到 TMUSICMainForm.SkinForm_OnCreate(SkinForm: TForm);

问题似乎与BSA: TbsaSkinAdapter

有关

如果我注释掉 BSA.ChangeSkinData;

行

泄漏不再存在。

编辑

这是堆栈跟踪的重要部分

--------------------------------2015/11/24 12:16:03-------------------------------- A memory block has been leaked. The size is: 308

This block was allocated by thread 0x1258, and the stack trace (return addresses) at the time was: 402AB6 [madZip][madZip][@GetMem] 4035F9 [madCrypt][madCrypt][TObject.NewInstance] 4039CA [madCrypt][madCrypt][@ClassCreate] 67438A [bsaadapter.pas][bsaadapter][TbsaSpeedButtonSubclass.Create][11537] 66137E [bsaadapter.pas][bsaadapter][TbsaHook.SetControl][2637] 403A1E [madCrypt][madCrypt][@AfterConstruction] 665BFB [bsaadapter.pas][bsaadapter][TbsaSkinManager.DoControlMessage][4898] 6615B7 [bsaadapter.pas][bsaadapter][TbsaHookCollection.AddControl][2760] 404ACB [madExcept][madExcept][@LStrSetLength] 662A0E [bsaadapter.pas][bsaadapter][TbsaSkinManager.CollectSpeedButton][3544] 92C81D [Sources\uMainForm.pas][uMainForm][TMUSICMainForm.SkinForm_OnCreate][4778]

The block is currently used for an object of class: TbsaSpeedButtonSubclass

The allocation number is: 475863

Current memory dump of 256 bytes starting at pointer address 7E8A7670: 64 C9 65 00 00 00 00 00 00 00 00 00 00 00 00 00 68 F3 48 00 50 96 97 7E B8 5E 74 7E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B8 D1 74 7E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d É e . . . . . . . . . . . . . h ó H . P – — ~ ¸ ^ t ~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ¸ Ñ t ~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

编辑

我已经设法创建了内存泄漏的最小工作示例。

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  BusinessSkinForm, bsaadapter, Buttons
  ;

type
  TForm1 = class(TForm)
    SpeedButton1: TSpeedButton;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
var
  BSF: TbsBusinessSkinForm;
  BSA: TbsaSkinAdapter;
begin
    BSF := TbsBusinessSkinForm.Create(Self);

    BSF.BorderIcons:=[biMinimize,biMaximize];

    BSA := TbsaSkinAdapter.Create(Self);

    BSA.AdapterType := bsaUseClasses;

    BSA.ChangeSkinData;
end;

end.

我发现即使我注释掉看似无辜的线条 BSF.BorderIcons:=[biMinimize,biMaximize]; 或 BSA.AdapterType := bsaUseClasses; 那么内存泄漏就消失了。

注意我的 delphi 表单在这个例子中包含 1 TSpeedButton

编辑

我还应该补充一点，我正在使用 windows 7（64 位），6GB 内存，delphi 5，Business Skin 版本 4.70

编辑

BusinessSkinForm 中的 bsaadapter 单元包含一个函数

procedure TbsaSkinManager.DoUnhook(Control: TControl; Handle: HWnd);
var
  i: integer;
  SC: TbsaSubclass;
  R: TRect;
begin
  if FUnhooking then Exit;

  if FUnhookedList = nil then
  begin
    FUnhooking := true;
    Exit;
  end;

  FUnhooking := true;
  try
    for i := FHandleList.Count - 1 downto 0 do
    begin
      SC := TbsaSubclass(FHandleList[i]);

      if (Handle <> 0) and (SC.Handle = Handle) then
      begin
        R := Rect(0, 0, 2000, 2000);
        PostMessage(Handle, WM_NCPAINT, 0, 0);
        InvalidateRect(Handle, @R, false);
        FHandleList.Delete(i);
        SC.Free;
      end;

      if (Control <> nil) and (SC.Control = Control) then
      begin
        FHandleList.Delete(i);
        SC.FControl := nil;
        if not (Control is TGraphicControl) then
          SC.Free;
      end;
    end;
  finally
    FUnhooking := false;
  end;
end;

似乎速度按钮没有被释放，因为它们是 TGraphicControl

的实例

if not (Control is TGraphicControl) then SC.Free;

虽然常规 TButton 会被释放

Answer 1

从我在这里看到的情况来看，有很多方法可以从这里开始。

提交对 BusinessSkinForm 的修复以处理速度按钮
接受变通方法即：BSA.AdapterType := bsaUseNames; 而不是 BSA.AdapterType := bsaUseClasses;
用常规 TButton 替换速度按钮。

Delphi 表单控件内存泄漏

Memory Leak on Delphi Form Controlls

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fastmm