DELPHI AREA Forum

Hello all,

Does anybody have any experience with marshalling interfaces accross threads?

Problem description:

Application starts and creates 5 threads.
Each thread creates 5 "triggers", a COM-object and a timer.
OnTimer the thread loops through the triggers. If the triggers get triggered they call the COM-object belonging to its owning thread.

At this point I get message, saying that the COM-object was marshalled to a different thread. So I'm guessing I should be "marshalling" it to this thread (which I don't get, since the trigger operates within the context of the owning thread, which also owns the COM-object - but what the heck).

How should I do this? I've read the help and googled for it quite a bit, but I just don't understand the CoMarshalInterface() functions at all, so any help would be much appreciated.

If code is needed, I would be happy to post it here, but it is quite a lot, so I'll start work on a simple "produce.dpr"...

Thanks.
Stefan

I have had tasks like this but never got such a message.

It is very difficult to guess what's wrong without seeing the code, but maybe this helps: If you create an object in the constructor of a thread, the main VCL thread is the owner.

Yes, I found that out yesterday. I've got the thread working now (by creating the COM-object at a later point than the thread-constructor), but now the problem's the other way around (when I call the COM-object from the main VCL thread).

Anyway, I'm still working on a little program that produces the error, but even that is a challenge, so I'll just post the entire code tonight..

Anyway thanks for the help so far..

Nevermind, I've found another way to do it... Anyway, thank you for your interest!

I'm glad to hear that.

Are you going to share it with us?

Messages PostThreadMessage() etc..
I figured I had to use them sooner or later, so here they were and now it works great!

Thank you!