Re: COM in dll

From:

"Alexander Nickolov" <agnickolov@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Mon, 12 Jun 2006 09:35:55 -0700

Message-ID:

<#4v6H5jjGHA.3496@TK2MSFTNGP04.phx.gbl>

To avoid confusion, I advise the OP to completely ignore this
reply. I can only reiterate Igor's question: what is the returned
HRESULT?

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://www.mvps.org/vcfaq
=====================================

"Hyun-Kyu, Kang" <ted78kr@yahoo.co.kr> wrote in message
news:usSceMjjGHA.4884@TK2MSFTNGP03.phx.gbl...

1. Use GetLastError().

2. Do not use ::CoCreateInstance. Use
pEngineFactory->CoCreateInstance(....)

3. Check the result using FAILED() macro.

if ( FAILED(pEngineFactory->CoCreateInstance(....)) ) {

}

... something like this

"Andreas Holzbach" <holzbach@in.tum.de> wrote in message
news:e6jseo$gim$1@news.in.tum.de...

Hi,
i try to implement a COM interface in a dll.
The function looks like this:

CComPtr<IPsEngineFactory> pEngineFactory;
HRESULT hr = CoCreateInstance(CLSID_EngineFactory, NULL,
CLSCTX_INPROC_SERVER, IID_IPsEngineFactory,
(LPVOID*)&pEngineFactory);

if(!(pEngineFactory==NULL))
{
return true;
}else
{
return false;
}

It always returns false, but I don't know why.
Any suggestions?