Registering handlers for .NET COM event in C?
It has been long time since I used COM and at that time I have using Visual C++ 6.0. I remember that implementing sinks for COM connection points was not an strait forward process. There were multiple ways for implementing them, depending if you used MFC or ATL.
Maybe there are more easier ways now. Here are couple of links that can help you: Code Project - Sinking events from managed code in unmanaged C Code Project - COM large number of articles about COM Code Project - Handling COM Events in a Console Application Code Project - Handling COM Events in a Console Application, Part II.
It has been long time since I used COM and at that time I have using Visual C++ 6.0. I remember that implementing sinks for COM connection points was not an strait forward process. There were multiple ways for implementing them, depending if you used MFC or ATL.
Maybe there are more easier ways now. Here are couple of links that can help you: Code Project - Sinking events from managed code in unmanaged C++ Code Project - COM - large number of articles about COM Code Project - Handling COM Events in a Console Application Code Project - Handling COM Events in a Console Application, Part II.
Thx. The first link showed me the 'missing parts' :-) – crimson13 Jan 25 '10 at 7:20.
IDispatch is used for runtime binding languages like VB, you wouldn't normally need to do this for a strongly typed language like c#. When you call a method through IDispatch, What you actually do is build an array containing the method id (called a dispid) and parameters, then hand that to a function that searches through a table of methods by dispid, when it finds one, it uses your parameter array to build a callstack and then call the method. (This is a oversimplification, of course).
So knowing that a class implements IDispatch tells you almost nothing. So this is ether a false lead, or you are missing the declaration for the MessageEventHandler dispatch tables. It's not at all surprising that you can't figure out how to implement from this, you are missing some vital information.
I've been following the 'tutorials' of how to expose a . NET framework through COM ( http://msdn.microsoft.com/en-us/library/zsfww439.aspx and http://msdn.microsoft.com/en-us/library/bd9cdfyx.aspx ). Everything works except for the events part.
The problem is that I haven't found any info on how to use this in C++. Do I need to derive from _MessageEventHandler and implement operator()? Or something else entirely?
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.
Related Questions
Difference between registering delegate and registering named method for event?
Passing event data in the inline event handlers?
Are Event Handlers removed from memory if the control linked to the event is removed?
Google Analytics Async Event Tracking with event handlers in jquery?
Determine list of event handlers bound to event?
Adding own event handler in front of other event handlers?