On Friday, October 4, 2013 6:16:36 PM UTC+5:30, Bobby Holley wrote:
> On Fri, Oct 4, 2013 at 2:36 PM, <[email protected]> wrote:
>
>
>
> > Based on my understanding, I need to create a JS XPCOM component apart
>
> > from the existing C++ XPCOM component I already have. All the JavaScript
>
> > function calls need to be made from JS XPCOM component.
>
> >
>
>
>
> Precisely.
>
>
>
>
>
> > How will the C++ XPCOM and JS XPCOM communicate to each other? Can we
>
> > instantiate JS XPCOM component from C++ XPCOM Component?
>
> >
>
>
>
> Yes. The great the about XPCOM components is that they can be instantiated
>
> and manipulated in either C++ or JS - the language of the implementation
>
> doesn't matter.
>
>
>
> >
>
> > I want to deliver only one .xpi to my customers. I hope it is possible to
>
> > package both C++ XPCOM and JS XPCOM components in the same .xpi file.
>
> > Please let me know if this is possible and whether you see any problems in
>
> > this approach.
>
> >
>
>
>
> Yep, that should work just fine.
>
>
>
> Here are some links that might be useful:
>
>
>
> https://developer.mozilla.org/en/docs/How_to_Build_an_XPCOM_Component_in_Javascript
>
> http://kb.mozillazine.org/Implementing_XPCOM_components_in_JavaScript
>
>
>
> bholley
Sorry for troubling you again.
I am trying to create one sample JavaScript XPCOM component.But not able to
instantiate JavaScript XPCOM component from C++ code.
Steps to create JavaScript XPCOM component-
1) Create nsIHelloWorld.idl file for nsIHelloWorld interface.
2) Create nsIHelloWorld.js file
3) Generating .xpt and header file using Python22.0.
4) Instantiate JavaScript XPCOM component from C++ code.
Code-
nsIHelloWorld.idl
----------------------------------------------------------
#include "nsISupports.idl"
[scriptable, uuid(8e001740-322b-11e3-aa6e-0800200c9a66)]
interface nsIHelloWorld : nsISupports
{
string Hellovasu();
};
----------------------------------------------------------
nsIHelloWorld.js
-----------------------------------------------------------------------------------------------------
Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
function HelloWorld()
{
}
HelloWorld.prototype = {
classDescription: "My Hello World Javascript XPCOM Component",
classID: Components.ID("{031572f4-3629-11e3-98fd-ce3f5508acd9}"),
contractID: "@keynote.com/firefox/helloworld;1",
QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsIHelloWorld]),
Hellovasu: function() {
return "Hello World!";
}
};
var components = [HelloWorld];
if (XPCOMUtils.generateNSGetFactory)
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([components]); //
Firefox 4.0 and higher
else
var NSGetModule = XPCOMUtils.generateNSGetModule([components]); // Firefox
3.x
----------------------------------------------------------------------------------------------------
chrome.manifest
----------------------------------------------------------------------------------
interfaces components/nsIHelloWorld.xpt
component 031572f4-3629-11e3-98fd-ce3f5508acd9 nsIHelloWorld.js
contract @keynote.com/firefox/helloworld;1
{031572f4-3629-11e3-98fd-ce3f5508acd9}
application={ec8030f7-c20a-464f-9b0e-13a3a9e97384}
-----------------------------------------------------------------------------------
Instantiate JavaScript XPCOM compnent from C++ code
-----------------------------------------------------------------------------------------------
#include "nsComponentManagerUtils.h"
#include "nsIHelloWorld.h"
nsCOMPtr<nsISupports> iSupports =
do_CreateInstance("@keynote.com/Firefox/helloworld;1",&rv1);
or
nsCOMPtr<nsIHelloWorld> ihello =
do_CreateInstance("@keynote.com/Firefox/helloworld;1",&rv1);
Not able to instantiate helloworld component.
-----------------------------------------------------------------------------------------------
Logs value for IHello and rv1 in hexa formet- IHello=0 rv1=80040154
Do you fell anything missing or wrong in this code? If you have any better
approach or solution please suggest me. I am completely stuck here.
Regards
Vasu
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