April 1999
Intermediate to advanced
502 pages
15h 5m
English
Content preview from Learning DCOM
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Event Sources
In this section, you will create the ChatServer component that exposes a COM object called an event source. This COM object, which you’ll name ChatServerObj, supports the ISendMessage interface for ChatClients to post chat messages. It also supports a connection point associated with a callback interface called IReceiveMessage that is implemented by the ChatClient component (which will be developed in the Event Sinks section of this chapter). The ChatServer uses this callback interface to propagate chat messages to all chatters
Figure 10-2 shows the connections between a ChatClient and a ChatServerObj COM object. Notice that besides ISendMessage, ChatServerObj implements the IConnectionPointContainer interface to allow a client to find a particular supported connection point.
Figure 10-2. ChatServerObj is a source object and CoMsgSink is a sink object
As you can see from Figure 10-2, the server component supports a connection point object that is associated with the IReceiveMessage interface, implemented by a client-side sink object, CoMsgSink. The client simply finds a connection point using the IConnectionPointContainer interface and tells the connection point that it wants to receive notifications by calling IConnectionPoint::Advise. The event source will make callbacks to the sink object at appropriate times.
Creating an Event Source Object
Our immediate goal is to create ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.