Re: GetClientSite() Always Gets NULL ... How Do I Make it Work?
"gyrm" <hbchai@gmail.com> wrote in message
news:1192762663.219184.262440@q5g2000prf.googlegroups.com
I'm creating the object as an ActiveX Control.
IE doesn't know nor care how the object is written. What matters how the
object is introduced to the page. If it's introduced with the <object>
tag, IE is going to host it: query for IOleObject, call SetClientSite
and so on and so forth.
If the object is created with ActiveXObject, IE doesn't do any of these
things - it just calls CoCreateInstance, and gives your IDispatch
pointer to the script, and that's it. Except that, if the object
implements IObjectWithSite, it will call SetSite and pass IHTMLDocument2
pointer of the page, if I recall correctly.
I'm still not entirely
clear on what the distinction between "ActiveX Control", "ActiveX
Object" and "COM Object" are ... basically I want to add some
functionality which does not have a visible component
So create a plain COM object (I believe ATL Wizard calls it a "simple
object") and implement IObjectWithSite.
so when I
created the class I selected to create a "minimal" DHTML ATL
control
That would be an ActiveX control that is a) designed to be hosted in IE
on an HTML page (with <object> tag), and b) itself hosts MSHTML
component so that its visible interface is designed as an HTML page.
Clearly that's not what you wanted.
<html>
<body>
<h1>foo</h1>
<em>bar</em>
<OBJECT ID="SnapsieCtl" CLASSID="CLSID:
3822F39C-7DDE-11DC-8314-0800200C9A66"></OBJECT>
<script type="text/javascript">
function doIt() {
var obj = new ActiveXObject('Snapsie.SnapsieCtl');
obj.SaveSnapshot('C:\foo.png');
}
</script>
<input type="button" value="doIt" onclick="doIt()"></input>
</body>
</html>
I added an <object> tag, but it still seems that m_spClientSite is
null. Is it still necessary to implement IObjectWithSite?
You now have two instances of your object: one created with <object>
tag, and I bet it does have a client site. And another, completely
unrelated instance created with ActiveXObject, which of course does not
have a client site. You are then calling SaveSnapshot on the latter, and
the first instance is jut sitting there looking pretty.
--
With best wishes,
Igor Tandetnik
With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925