Hi,
is there any known problem with debugging code that uses lots of interfaces?
I use gdb with Lazarus under Linux.
I try to port ESS-Model class diagram program.
It has fancy interfaces like:
IObjectModelListener = interface(IUnknown)
['{4CC11ED0-016F-4CC4-952E-E223340B1174}']
procedure Change(Sender: TModelEntity);
end;
IBeforeObjectModelListener = interface(IObjectModelListener)
['{714C82A0-1098-11D4-B920-005004E9A134}']
end;
IAfterObjectModelListener = interface(IObjectModelListener)
['{714C82A1-1098-11D4-B920-005004E9A134}']
end;
and then calls to QueryInterface:
if L.QueryInterface(IBeforeObjectModelListener,Dum) = 0 then
(L as IBeforeObjectModelListener).Change(nil);
When I try to debug some other problems, debugger hits a breakpoint correctly
but the system (=Lazarus+gdb) freezes. It doesn't accept mouse clicks or key
commands. Killing gdb helps, then Lazarus starts to respond again.
The strange thing is that I can step with F7 and F8 to the same breakpoint and
it doesn't freeze. Apparently the interface code is correct. Only if I use F9
to reach the breakpoint then it freezes.
I am not sure if the problem is Interfaces. It was just my guess.
Any ideas?
Regards,
Juha
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