I'm having some fun with interfaces
I have two interfaces IXMLResidentialType and IAuctionable.
I have a class which implements these two interfaces
TXMLResidentialType = class(TXMLNode, IXMLResidentialType, IAuctionable)
...
I have some code
var
Res : IXMLResidentialType;
Auctionable : IAuctionable;
begin
...
if Res.QueryInterface(IAuctionable, Auctionable) = 0 then
ShowMessage('Auctionable');
What I'm trying to determine is if Res implements IAuctionable - which
it does (through TXMLResidentialType which effective Res is an instance
of), however IXMLResidentialType doesn't seem to realise this. How do I
make this work?
Does this question make any sense?
If I'm not able to do this it's not too much of a problem, but will mean
a bunch of duplicated code.
--
Alister Christie
Computers for People
Ph: 04 471 1849 Fax: 04 471 1266
http://www.salespartner.co.nz
PO Box 13085
Johnsonville
Wellington
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