Automation Open (CoCreateInstance) with BlackMagic DeckLink frame grabber

I am trying to interface BlackMagic frame grabber hardware that has a COM driver. The C++ demos for the driver work flawlessly, but I fail to access the COM components from LabVIEW. The driver is initiated in C++ with
CoCreateInstance(CLSID_CDeckLinkIterator,NULL,CLSCTX_ALL,IID_IDeckLinkIterator,(void**)&pIterator);
As far as I understand the corresponding LabVIEW command should be to use Automation Open with either CDeckLinkIterator or IDeckLinkIterator as automation refnum. However for both refnums LabVIEW returns an error when executing Automation Open: Error 3005 occurred at Automation Open: Object specified is not creatable.
When I look at the demo code provided with the COM driver, there are really two COM commands that are executed before the CoCreateInstance
AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0)
CoInitialize(NULL)
Does anyone have a clue why the Automation Open might be failing in LabVIEW but CoCreateInstance is not failing in C++. Is there a possible workaround? I have tested this with both 64- and 32-bit LabVIEW 8.6.1.
Tomi
Tomi Maila

Hi,
I made some progress...
I found a response to my first question in the forum, with a link to :
http://digital.ni.com/public.nsf/allkb/6EC98441BFAF93A486256DCD000179A2?OpenDocument
so the solution of this problem is in snipet decklink1
My remaining problem is about the configuration of the callback. It doesn't seem to work like in LV examples, or forum examples, as I cannot reference my callback VI as the callback function, and I get no event in the 'register for event' node.
Phil
Message Edité par Ficare le 03-19-2010 12:11 PM
Attachments:
decklink 1.png ‏29 KB

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