Hi,
I have
read all the previous threads on nsIWebProgressListener.
I have
included the Interface of nsISupportsWeakReference, nsIObserver, and
nsIWebProgressListener.
I have
put AddProgressListener into the Observe() routine upon "xpcom-startup".
still,
the xpcom object crashes inside of AddProgressListener() with error msg
saying "pure virtual function".
My code
set up is as follows:
(1)
Gecko SDK 1.7.3 with xpcomglue.lib and xpcom.lib linked in
(2) Test
with Mozilla 1.7.3 and Firfox 0.9x
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Here is
what is inside of my observe() code:
if
(strcmp(aTopic, "xpcom-startup") == 0)
{
nsCOMPtr<nsIServiceManager> servMan;
nsresult rv = NS_GetServiceManager(getter_AddRefs(servMan));
if (NS_FAILED(rv))
return NS_OK;
nsCOMPtr<nsIWebProgress>
progress;
rv =
servMan->GetServiceByContractID( "@mozilla.org/docloaderservice;1",
NS_GET_IID(nsIWebProgress),
getter_AddRefs(progress));
if (NS_SUCCEEDED(rv))
{
if (progress)
progress->AddProgressListener(NS_STATIC_CAST(nsIWebProgressListener*,this),
nsIWebProgress::NOTIFY_STATE_DOCUMENT);
}
}
----------------------------------------------------------------------------------------------------------
I have
provided the impl for 4 interfaces
NS_IMPL_ISUPPORTS4(MyComponent,
IMyComponent,
nsIWebProgressListener,
nsIObserver,
nsISupportsWeakReference)
----------------------------------------------------------------------------------------------------------
Here is the MyComponentRegistration
code:
nsresult rv;
nsCOMPtr<nsIServiceManager> servman =
do_QueryInterface((nsISupports*)aCompMgr, &rv);
if (NS_FAILED(rv))
return rv;
nsCOMPtr<nsICategoryManager>
catman;
rv = servman->GetServiceByContractID( NS_CATEGORYMANAGER_CONTRACTID,
NS_GET_IID(nsICategoryManager),
getter_AddRefs(catman));
if (NS_FAILED(rv))
return rv;
char *previous = nsnull;
rv = catman->AddCategoryEntry("xpcom-startup",
MY_COMPONENT_CLASSNAME,
MY_COMPONENT_CONTRACTID,
PR_TRUE,
PR_TRUE,
&previous);
if (NS_FAILED(rv))
return rv;
if (previous)
nsMemory::Free(previous);
return rv;
----------------------------------------------------------------------------------------------------------
Any help is appreciated
Thanks,
Steve Lu
