Hello,
> I have some problem with DefaultHandler method. When I pass a
>message for which is special handler defined everything is ok, but when
>it should be passed to DefaultHandler (which is overriden) it does
>nothing. Here is some sample code:
>
> {$MODE OBJFPC}
> type TMyMessage = record
> MSGID : cardinal;
> text : string;
> end;
>
> TTest=class(TObject)
> constructor Init;
> procedure Handle (var MyMessage : TMyMessage); Message 1; virtual;
> procedure DefaultHandler(var MyMessage : TMyMessage); virtual;
> destructor Done;
> end;
>
> It should write two times the "Hello world message". For the first time
from
> method TTest.Handle, and for the second time from method
> TTest.DefaultHandler. But TTest.DeafultHandler doesn't do anything
> (it writes only one message).
The DefaultHandler method has a wrong signature and so your method is not
called. You have to override
procedure Dispatch(var Message); override;
and use a typecast in the method implementation, e.g.
procedure TTest.DefaultHandler(var MyMessage);
begin
writeln(TMyMessage(MyMessage).Text);
end;
Note that Delphi (don't have FPC installed on this machine, sorry) complains
that message methods may not be declared as virtual (doesn't make much sense
imo, since dispatching a message to an object always is "bound" dynamically
using the message identifier).
Hth,
Thomas
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