Class, records and memory leaks

[WojTec]

I just bought EL7 and checked project with it. It found some memory leaks (I thought that TListView.TListItem.Data can be free automatically, but ok, I did it manually). But I have yet another leak and I don't know WTF

So, I'm adding to TListView simple class with 2 reintroduced constructors and a few record field (some record fields has another record field). On object create I only need to alloc memory and init one field (fill record with valid data) - parameter in one constructor. This record has 2 string fields and for next operations in proggy it have to valid values. To make sure record contain valid data I'm filtering input by function - it sets valid values in record, then function result is passed as constructor parameter (and second constructor doing the same, but itself internally). All is oke, hmm, it isn't oke - at the program termination EL reporting memory leaks in function that setting valid data for constructor. All in pseudocode:

Code:

button click:
 AddItem(TObj.Create(foonction(input1, input2: str)))  // <-- point 1

foonction(param1, param2: str): record;
 result.param1 := extractdata1()
 result.param2 := extractdata2()

 result := formatit(result)  // <-- point 2

formatit (record): record;
 do format fields strings

point 3 in EL log is in System._NewUnicodeString

[Sir Rufo]

Alister Christie just published a new Video Tutorial for you

http://www.delphipraxis.net/172786-m...itemclass.html

Do you really think your pseudo code will give us a clue about the leaks?

[WojTec]

Zitat:

The OnCreateItemClass event was introduced to TListView a few versions of Delphi ago, you've probably never noticed it (...)

Yes, that's true

About leaks - now I'm not sure if any are in my proggy. EL6 and EL7 in v6 mode doesn't show any, but EL7 after disable backward compatibility reporting a few kB leaked... I don't know...

[Union]

Try to disable EL and verify the leaks with FastMM.