COM

CComObject<CMyClass>::CreateInstance

// Create a local instance of COM object CMyCircle.
double x;
CComObject<CMyCircle>* pCircle;
HRESULT hRes = CComObject<CMyCircle>::CreateInstance(&pCircle);// is there any method to get running instance instead of new one.
_ASSERTE(SUCCEEDED(hRes));

Michael Dunn wrote:

Look for _Module or CComObjectRootEx or BEGIN_COM_MAP or any other ATL base class/macro.

IUnknown *pUnk;
hr = ::CoCreateInstance(CLSID_UpdateServiceManager, NULL, CLSCTX_INPROC_SERVER, IID_IUnknown, reinterpret_cast<LPVOID*>(&pUnk));
if (FAILED(hr))
{
     // If we get here the CLSID_UpdateServiceManager object doesn't exist or perhaps CLSCTX_INPROC_SERVER is not appropriate.
     return false;
}
 
IUpdateServiceManager *pMgr;
hr = pUnk->QueryInterface(IID_IUpdateServiceManager, reinterpret_cast<LPVOID*>(&pMgr));
if (FAILED(hr))
{
     // If we get here we created the object OK but it doesn't implement IUpdateServiceManager.
     pUnk->Release();
     return false;
}
 
pMgr->Release();
pUnk->Release();