Re: how do i call my interface

[Tobias Oberstein]

> i have a interface but just giving the path name of the IDL doesnt
> work.....anyone there who can help me out????


if by path name you mean the path to the IDL file in the cvs source
repository - that has no meaning at run-time.

the authorative "identifier" for an interface (and for components as
well by the way) is it's IID (interface id)

e.g. 
http://lxr.mozilla.org/seamonkey/source/xpcom/ds/nsISimpleEnumerator.idl
starts with

[scriptable, uuid(D1899240-F9D2-11D2-BDD6-000064657374)]
interface nsISimpleEnumerator : nsISupports {
..


you see this HEX representation of a 128 bit number:
D1899240-F9D2-11D2-BDD6-000064657374

that's the IID of the interface nsISimpleEnumerator.

Now, in different languages, you have different ways of getting to it ..

in Python, you can:


 >>> import xpcom
 >>> from xpcom import components
 >>> print components.interfaces['nsISimpleEnumerator']
{D1899240-F9D2-11D2-BDD6-000064657374}

or just

 >>> print components.interfaces.nsISimpleEnumerator
{D1899240-F9D2-11D2-BDD6-000064657374}


in C++ you can:


#include "nsISimpleEnumerator.h"

nsresult rv = foo->QueryInterface (NS_GET_IID(nsISimpleEnumerator), 
(void**) enm);



in JavaScript it work like so:

<script>

netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
var sample = Components.classes["@mozilla.org/sample;1"].createInstance();
sample = sample.QueryInterface(Components.interfaces.nsISample);

...


Tobias.




generally, you'll may want to look at ..
http://lxr.mozilla.org/seamonkey/source/xpcom/sample/xpconnect-sample.html

there you'll find ..

<script>
/* to use nsSample.js version, use "@mozilla.org/jssample;1" */
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
var sample = Components.classes["@mozilla.org/sample;1"].createInstance();
sample = sample.QueryInterface(Components.interfaces.nsISample);
dump("sample = " + sample + "\n");

function get()
{
 
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); 
  var field = document.getElementById('Value');
   field.value = sample.value;
}

function set()
{
 
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); 
  var field = document.getElementById('Value');
   sample.value = field.value;
}

function poke()
{
 
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); 
  var field = document.getElementById('Value');
   sample.poke(field.value);
}

function sampleWrite()
{
   netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
   sample.writeValue("here is what I'm writing: ");
}
</script>

<form name="form">
<input type="button" value="Get" onclick="get();">
<input type="button" value="Set" onclick="set();">
<input type="button" value="Poke" onclick="poke();">
<input type="text" id="Value">
<input type="button" value="Write" onclick="sampleWrite();">
<form>