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[Solved] IWiaVideo::CreateVideoByDevNum Failure

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Hello all, I'm trying to capture image using WIA from a webcam. I get a failure which I cannot explain the cause. Please see the following source code:
HRESULT Result = S_OK;
IWiaVideo *Device = NULL;

Result = CoCreateInstance(CLSID_WiaVideo, NULL, CLSCTX_INPROC_SERVER, IID_IWiaVideo, (void**)&Device);
// Ok Result is still 'S_OK' here still.
Result = Device->CreateVideoByDevNum(0, hWnd, FALSE, TRUE);
// Now Result is E_POINTER.

I cannot explain why the result is E_POINTER all the time. All drivers are installed and only 1 webcam is connected to this computer. Can any help me? Thank you, Xeile [Edited by - Xeile on January 10, 2006 9:31:12 AM]

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