Passing Arrays to JS-XPCOM from C++

[shansy...@gmail.com]

Hi,


I have to pass an array of strings (or JS::Value array) to JS-XPCOM from my C++ code. I could not find the proper example in C++ to implements this.

Based on the "jsFunction" I am passing in JS-XPCOM, i will extract the correct number of values in the JS and call the expected function.

How to pass the array of JS::Value to JS::HandleValue in the C++ fn ? Your help is highly appreciated


1 - My IDL as below

#include "nsISupports.idl"
#include "nsIDOMWindow.idl"
[scriptable, uuid(e583b11e-2043-11e4-9070-fd8b1d5d46b0)]
interface nsISbCollectURL: nsISupports
{
jsval callJSXPCOMFunction(in nsIDOMWindow domWindow, in wstring jsFunction, in unsigned short argc, in jsval argv);

};

2 My "C++" Header file has the following signature (after compiled by /gecko-sdk/xulrunner-sdk/sdk/bin/typelib.py )

NS_IMETHOD CallJSXPCOMFunction(nsIDOMWindow *domWindow, const char16_t * jsFunction, uint16_t argc, JS::HandleValue argv, JS::MutableHandleValue _retval) = 0;

--> How to convert the populate JS::Value arrays to "JS::HandleValue param" in the method signature? I got stuck here. <---


3 - MY JS-XPCOM as below

Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");

function MyComponent() { }

MyComponent.prototype = {
classDescription: "test JS XPCOM Component",
classID: Components.ID("{8f1a877e-2045-11e4-b92a-1b8d1d5d46b0}"),
contractID: "@test.com/mytest/jssource;1",
QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsISbCollectURL,Components.interfaces.nsISupports]),

callJSXPCOMFunction: function(win, jsFunction, argc, argv)
{
win.wrappedJSObject.alert("Coming to callJSXPCOMFunction");
win.wrappedJSObject.alert(argc);
if(jsFunction == "readMe")
{

win.wrappedJSObject.alert("Coming to readMe");
var name ;
var age;
var hobby;
if(argc >= 1)
var name = argv[0];
if(argc >= 2)
var age = argv[1];
if(argc >= 3)
var hobby = argv[2];
var as = "shan : name : " +name + " age " + age + " hobby : " + hobby);
var myData = win.wrappedJSObject.shan_readme(name, age, hobby);
return myData;

}else if(jsFunction == "writeMe"){
win.wrappedJSObject.alert("Coming to writeMe");
if(argc >= 1)
var xmlStuff = argv[0];

win.wrappedJSObject.alert(xmldata);
return win.wrappedJSObject.shan_rwriteme(xmldata);
}
}

};


var components = [MyComponent];

if ("generateNSGetFactory" in XPCOMUtils)
var NSGetFactory = XPCOMUtils.generateNSGetFactory(components);
else
var NSGetModule = XPCOMUtils.generateNSGetModule(components);


Thanks
Shan