Implementing COM event sinks in a legacy Win32 Application

Question

I have a legacy Win32 application (WndProcs, etc) that needs to consume a COM object. With the use of a little ATL headers and some smart pointers that was a snap, however what I'm currently struggling with is how best to sink the events coming off that COM object?

My current working plan has been to build a second COM object (as a dll) that handles all the sinking and uses windows messages to communicate with the legacy application. This is "ok" but there's a lot of cruft moving messages back and forth to make the legacy application do what I want.

Is there a readily accessible way to get the Win32 legacy application to sink COM events directly vs running through the second "sinker" com object?

Before I go to far down this process I wanted to see if anyone else ran across this before and had a working solution.

Thanks!

"...to sink COM events directly..." : where ? A connection point design requires an interface pointer to which it sends its events after said-interface is registered via a call to Advise(). That's how connection points work. If you're asking whether you have to implement the COM object on which that event target interface hangs as a DLL-based inproc server, the answer is no, but you need an interface regardless. How you provide that interface is entirely up to you. — WhozCraig
– WhozCraig, Commented Aug 29, 2014 at 12:41
ATL IDispEventImpl accepts "typical" ActiveX control events delivered via connection points and IDispatch::Invoke. — Roman Ryltsov
– Roman Ryltsov, Commented Aug 29, 2014 at 13:37

OldSchool · Accepted Answer · 2014-08-30 20:13:42Z

4

Stumbled across this excellent write up by the always brilliant Raymond Chen.

http://blogs.msdn.com/b/oldnewthing/archive/2013/06/12/10425215.aspx

As WhozCraig indicated above, all I needed was the Interface pointer and to setup the Advise, handle the Invoke.

Nice and clean.

Thanks!

answered Aug 30, 2014 at 20:13

OldSchool

1529 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

xeed Over a year ago

This helped a lot. Thank you. I was actually quite close, but didn't know what to do with the other functions in IDispatch. Turns out. Nothing! ^^

Collectives™ on Stack Overflow

Implementing COM event sinks in a legacy Win32 Application

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related