[fpc-devel] 0010465: CsSubComponent component properties not streamed

Michael Van Canneyt michael at freepascal.org
Sun Dec 23 22:12:01 CET 2007

On Sun, 23 Dec 2007, Martin Schreiber wrote:

> Hi,
> Michael Van Canneyt marked my bugreport 10465 with "won't fix", I would like 
> to discuss the issue in a broader forum.
> With fixes_2_2 rev. 9006 FPC does not stream published component properties 
> where the component has CsSubComponent set if the property component is not 
> owned by the streamed component.
> Delphi streams CsSubComponent properties independent of ownership.
> Caused by this change some properties of MSEgui components will be deleted if 
> MSEide is compiled with fixes_2_2 >= rev 9006, the users will loose data.
> Sometimes I use in MSEgui components as worker objects in other components 
> which should behave as simple TPersistent descendants and not be integrated 
> in the ownership system. I achieve the wanted behaviour by creating them with 
> a NIL AOwner parameter.
> An example is tsocketclientiochannel where I use a tifisocketclient component 
> with CsSubComponent set in order to implement the socket functionality and to 
> allow the user to do the socket settings by the object inspector of MSEide.
> Michaels change now forbid this method although it is completely legal in 
> Delphi.
> Now I have several possibilities:
> 1. I can accept Michaels verdict and surrender to use my programming method 
> and rewrite the affected MSEgui pieces and introduce an incompatibility with 
> current MSEgui projects.

There is no incompatibility:
Just replace the Nil with the owner. Your code will function as it was.

The Owner-Owned relation is in no other location used during streaming, 
so you should not worry about that.


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