RTL和VCL內存泄露

Question

我使用FastMM4在FullDebugMode查找內存泄漏，而且我得到了很多的抱怨UnicodeString，TList，TParameters等情況下是這樣的：

A memory block has been leaked. The size is: 276 
This block was allocated by thread 0x2928, and the stack trace (return addresses) at the time was: 
404CFE [System][@GetMem$qqri] 
408C0F [System][@NewUnicodeString$qqri] 
408E40 [System][@UStrFromPWCharLen$qqrr20System.UnicodeStringpbi] 
408F17 [System][InternalUStrFromPCharLen$qqrr20System.UnicodeStringpcii] 
5C006B [Vcl.Themes][Themes.TUxThemeStyle.GetElementDetails$qqr27Vcl.Themes.TThemedScrollBar] 
774861EF [GetWindowLongW] 
74B6588B [Unknown function at DrawThemeParentBackground] 
74B6586C [Unknown function at DrawThemeParentBackground] 
74B6780B [Unknown function at OpenThemeData] 
7748C5FE [Unknown function at gapfnScSendMessage] 
77481B31 [Unknown function at PeekMessageA] 

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

A memory block has been leaked. The size is: 20  
This block was allocated by thread 0x2928, and the stack trace (return addresses) at the time was: 
404CFE [System][@GetMem$qqri] 
406EB3 [System][TObject.NewInstance$qqrv] 
407556 [System][@ClassCreate$qqrpvzc] 
406EE8 [System][TObject.$bctr$qqrv] 
814DD8 [Datasnap.DBClient][Dbclient.TCustomClientDataSet.ClearActiveAggs$qqrv] 
815359 [Datasnap.DBClient][Dbclient.TCustomClientDataSet.ResetAllAggs$qqro] 
80D8AC [Datasnap.DBClient][Dbclient.TCustomClientDataSet.InternalOpen$qqrv] 
6948D7 [Data.DB][Db.TDataSet.DoInternalOpen$qqrv] 
69498F [Data.DB][Db.TDataSet.OpenCursor$qqro] 
80CA87 [Datasnap.DBClient][Dbclient.TCustomClientDataSet.OpenCursor$qqro] 
69484B [Data.DB][Db.TDataSet.SetActive$qqro] 

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

我目前的內存泄漏報告大概是兩兆字節，其大部分內容就是這樣。發生什麼事？我應該關心RTL和VCL內部結構和可能的內存泄漏嗎？如果是的話，我能做些什麼呢？

Answer 1

我應該關心RTL和VCL內部以及它們內部可能的內存泄漏嗎？

大概不會。最近版本的RTL/VCL很乾淨。我沒有遇到與他們的泄漏，雖然這並不是說你不會。

無論如何，您呈現的報告看起來就像您的代碼中的例行內存泄漏。當你的代碼泄漏時，通常發生的是你創建一個對象然後不能銷燬它。泄漏的物體可以擁有許多其他物體。他們都被FastMM跟蹤並報告爲不同的泄漏。所以，如果你創建一個包含字符串的對象，那麼泄漏擁有的對象也會泄漏字符串。