Hi I am trying to develop my first couple of C++ XPCOM components for a
firefox extension I am working on. There are 2 components that I am dealing
with one is LpWebService and the other is LpCategory. If I create an
LpCategory object explicitly in javascript it behaves fine. If I call the
GetCategories function on the LPWebService component It returns the correct
number of LPCategory objects but when I try to access an attribute the
script stops processing. See the code below. Hopefully one of you XPCOM
gurus can help me. Thanks so much.
/** Javascript **/
try{
//creating an LpCategory this way works and the second alert here displays
the correct value.
cat =
Components.classes["@interface.com/XPCOM/LpCategory;1"].createInstance(Components.interfaces.ILPCategory);
alert(cat);
cat.categoryId = 5;
alert(cat.categoryId);
//Creating the webservice works this way as well
obj =
Components.classes["@interface.com/XPCOM/LpWebService;1"].createInstance(Components.interfaces.ILPWebService);
var count = new Object();
//GetCategories returns an array that has the correct number of
Categories
var res = obj.GetCategories(true, count);
alert(count);
alert(res);
alert(res.length);
alert(res[0]);
//everythign up until here works. When I access the attribute of the
category object returned here it simply doesn't proceed past this point.
alert(res[0].categoryId);
}catch(e){
alert(e);
}
/*** C++ ***/
/* void GetCategories (in boolean refresh, out PRUint32 count, [array,
size_is (count), retval] out ILPCategory categories); */
NS_IMETHODIMP LPWebService::GetCategories(PRBool refresh, PRUint32 *count,
ILPCategory ***categories)
{
// Initialize
const int NR_TO_ALLOCATE = 1;
*count = 0;
// Allocate a one-member array of category pointers
LPCategory **outArray = new LPCategory* [NR_TO_ALLOCATE];
// Initialize the first and only member of the array to point to a newly
allocated category object
outArray[0] = new LPCategory;
// Set the returned number allocated
*categories = (ILPCategory**)outArray;
*count = NR_TO_ALLOCATE;
;
return NS_OK;
}
/*** IDL ***/
#include "nsISupports.idl"
[scriptable, uuid(43e27230-97f0-11da-a72b-0800200c9a66)]
interface ILPCategory : nsISupports
{
attribute long categoryId;
attribute string categoryName;
};
[scriptable, uuid(86d8dce1-972e-11da-956d-00e08161165f)]
interface ILPWebService : nsISupports
{
void GetCategories(in boolean refresh, out PRUint32 count, [array,
size_is(count), retval] out ILPCategory categories);
};
--
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