On 09/28/2016 01:24 AM, Graeme Geldenhuys wrote:
On 2016-09-28 08:38, David Emerson wrote:
I'm testing out CORBA interfaces before changing all my code to use them
(I would prefer not to have managed types for interfaces).
I've been using CORBA style interfaces for years, and it was always
worked well for me. I must add, I never use the is/as syntax though (for
COM or CORBA style interfaces). I always use Supports(..) as in:
var
h: i_hello;
begin
// fellow is the class instance variable.
if Supports(fellow, i_hello, h) then
h.hello;
The Supports(..) syntax just seems more logical to me than the is/as
syntax. The latter assumes the object "is" an instance of one of the
interfaces and simply typecasts it to a interface variable. The
Supports(..) syntax queries the object instance and asks if it supports
a specific interface.
Thanks, Graeme. I tried this but I'm getting a compilation error:
"Interface type i_hello has no valid GUID"
I assume this is the Supports function(s) in sysutils
Is it possible to use Supports / QueryInterface / GetInterface /
something else, without having a GUID?
Alternately, if I give a GUID does an interface not automatically become
COM + managed?
Thanks,
David
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