It is not really that clear to me from your question exactly what it is
that you are asking.
nsDOMClassInfo is pretty much an internal DOM class. If you want to mess
around with that stuff you should probably be talking to people on the
DOM newsgroup.
The way to get xpconnect to call your Construct method on an
implementation of nsIXPCScriptable is to OR the
nsIXPCScriptable::WANT_CONSTRUCT with the other flags returned by your
GetScriptableFlags method.
If you were not messing with the DOM stuff I'd suggest you use the
macros in xpc_map_end.h to do this for you. There are plenty of examples
of that. But, the DOM code has it's own way of managing the
nsIXPCScriptable stuff.
And, FWIW, the most simple and generic way to expose a constructor
method into JS is to execute a one line JS script using
Components.Constructor to build the constructor method for you.
John.
DEIV wrote:
Thanks for your comments.
It looks like I was too busy with my question because now I have a problem
how to make JS-engine invoke method IXPCScriptable::Construct().
Actually I have helper class
class nsIntArraySH : public nsDOMClassInfo
with public method
NS_IMETHODIMP
Construct(nsIXPConnectWrappedNative *wrapper, JSContext *cx,
JSObject *obj, PRUint32 argc, jsval *argv,
jsval *vp, PRBool *_retval)
The question is what is the right way to register this one?
Thanks
"John Bandhauer" <[EMAIL PROTECTED]> ???????/???????? ? ????????
?????????: news:[EMAIL PROTECTED]
DEIV wrote:
there are some difficulties with using IXPCScriptable::Construct()...
I have a XPCOM class with constructor with one parameter. I would like
to write in my java scpirt something like this
var obj = new MyXPCOM(122);
how I should implement this function to provide this functionality?
NS_IMETHOD Construct(nsIXPConnectWrappedNative *wrapper, JSContext *
cx, JSObject * obj, PRUint32 argc, jsval * argv, jsval * vp, PRBool
*_retval)
{
???
return NS_OK;
}
Did you figure out how to do this?
There are a few instances of this that can be found in the mozilla tree
using lxr.mozilla.org.
You might look at:
http://lxr.mozilla.org/seamonkey/source/js/src/xpconnect/src/xpccomponents.cpp#1207
This is nsXPCComponents_Exception::Construct. It is part of the internals
of xpconnect. So, it has some aspects that would not make sense for other
components. But, it is something to look at.
Basically, you: convert your JS argument(s). create your C++ object with
whatever constructor or init method you need to call, use xpconnect to
create a wrapper, get the JSObject* of the wrapper, return the JSObject*.
That code I referenced has things you would not want...
The " XPCCallContext" is an xpconnect internal thing. you would not need
it.
You wouldn't need the nsIXPCSecurityManager either.
You can get a pointer to the nsIXPConnect object used for making the new
wrapper from the 'XPConnect' attribute on the wrapper passed into the
constructor.
As I said, there are other examples you might look at. I believe the DOM
code uses IXPCScriptable::Construct too.
John.
Thanks
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