On Mon, Sep 19, 2011 at 2:51 AM, Martin Schreiber <[email protected]> wrote: > On Monday 19 September 2011 03.43:22 Marcos Douglas wrote: >> Hi, >> >> Many files of MSE source has {$interfaces corba}. >> I would know why this approach was chose > > MSEgui does not use refcounted interfaces. Refcounted interfaces can not be > used in combination with TComponent in FPC because FPC sometimes creates > intermediate variables and calls _Release() after the component has been > destroyed. MSEgui has its own object lifetime control handling and does not > depend on compiler interface refcounting because I normally need full control > on the object destroy moment. > >> and how this works if compile >> in Delphi 7. >> > In Delphi refcounted COM interfaces and dummy _AddRef() _Release() functions > will be used. That works in most cases. IIRC there are possible crashes in > Delphi too.
I saw this in mseglob.pas. I'm thinking do the same idea. >> I'm writing a lib that has many interfaces... but I'm using IInterface >> (i.e. IUnknow) and TInterfacedObject. >> > That should be OK but *never* call <theinterfaceobject>.Destroy() or Free() if > you can't guarantee that there are no interface references left. On FPC there > always can be references in intermediate variables you don't know of. Yes, I had this problem... >> The variables are interface type and I'm using ref-counted. >> Using CORBA I think this is inverse: variable are classes and have not >> ref-counted... so, I can only use variables that are classes not >> interface type, right? >> > You can use CORBA interface variables additionally to the instance variable. Here is my doubt: I can use variables additionally to the instance variable -- that is one of advantages, the parameters of some methods will be interfaces -- but I can not instantiate an interface variable, because I can't release it. Is that right? Resume: 1- In CORBA, I only can instantiate variables of concret class, but I can use interfaces variables additionally to the instance variable, of course; 2- In IUnknow, I only can instantiate variables of interfaces. Can you confirm that? Marcos Douglas _______________________________________________ MSEide-MSEgui-talk mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mseide-msegui-talk
