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Doubt in COM

P: 16
I am new to COM, Just Starting to learn.
I have doubt in interface.
Ie I Created two interface in com.I am trying to acess that interface methods,

In client:

HRESULT hr =CoInitialize(0);
IAscendServicePtr iIAscService;
hr = ::CoCreateInstance(CLSID_AscendService, NULL, CLSCTX_INPROC_SERVER, IID_IAscendService, (void**)&iIAscService);
if(hr !=0)
return 0;
IAscendAttributePtr iAtrptr;
hr = ::CoCreateInstance(CLSID_AscendAttribute, NULL, CLSCTX_INPROC_SERVER, IID_IAscendAttribute, (void**)&iAtrptr);
if(hr !=0)
return 0;
// The second CoCreateInstance fails , ie it doesnt give that pointer (ie
iAtrptr = NULL)

Why its NuLL..

Can any one guide me.

May 28 '07 #1
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1 Reply

Expert Mod 5K+
P: 9,197
I would replce the CoCreateInstaance with its equivalent:

CoGetClassObject(rclsid, dwClsContext, NULL, IID_IClassFactory, &pCF);
hresult = pCF->CreateInstance(pUnkOuter, riid, ppvObj)

Then I would check the HRESULT from Create Instance to see what gives.
May 28 '07 #2

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