We can take the code we have so far a step further . . . but only if
you have Internet Explorer 5.0 installed on your box. IE 5.0 provides
us with the means to add a menu item and toolbar button for our
component. There is some grunt work involved, but it’s not too
bad. Basically, we have to add a bunch of settings to the registry,
and our component needs to implement an additional interface,
We are also going to become
somewhat familiar what another new interface called
IServiceProvider. This is because we cannot query
the site pointer for
IWebBrowser2 like we did for
BHOs. We will get access to an
interface that we can use to request the
IWebBrowser2. As you will see in
Section 12.2.2 later in this chapter, we will have to
jump through a few hoops to do this.
Just to keep things a little suspenseful, we’ll wait until the component is wired up and ready to go before we actually discuss its purpose. Exciting, huh?
For the most part, browser extensions work just like browser helper objects. But there are some minor differences. For one thing, they are registered differently. When Explorer loads a browser extension, it looks under the following key:
HKEY_LOCAL_MACHINE\ SOFTWARE\ Microsoft\ InternetExplorer\ Extensions\
There are also some additional registry entries that will provide the toolbar icons and the menu item text, but we’ll discuss them later.
Like BHOs, browser ...