[fpc-pascal]Interfaces, What am I doing wrong?

Sebastian G√ľnther sguenther at gmx.de
Mon May 12 09:01:38 CEST 2003


Jon Sawyer schrieb:
> I'm trying to learn how to use Interfaces.  I'm going by Delphi's 
> documentation.  I know that I'm ignoring GUIDs but as far as I can tell from 
> the docs there not vital.  If there are how can I generate my own?? ^_^

I think there is a GUID generator included with Microsofts Platform SDK


> But I'm getting real stuck.  The doc's on Delphi's web page mentions NOTHING 
> about implementing IUnknown's methods.   Do I have to?

Yes... The easiest way is to derive your implementation class from 
TInterfacedObject. If you cannot use TInterfacedObject: Just use the 
source of its implementation as a starting point for your code. AddRef 
and Release are very easy to implement; if you need QueryInterface, 
depends on your code. But it would be wise to implement QueryInterface 
as well (which requires the usage of IIDs, of course).


- Sebastian





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