Re: How to use this returned IDispatch interface?

Hi,

In my project I want to export an ado connection interface and use it.

The code like this:
STDMETHODIMP CDBInterface::OpenDBConnect(IDispatch **pConnect)
{
  _ConnectionPtr pConn;
  if (OpenDBConnection(pConn))
  {
   *pConnect = (IDispatch*)pConn;
   pConn->AddRef();
    return S_OK;
  }else{
   return E_FAIL;
  }
}

STDMETHODIMP CDBInterface::SQLQueryWitchConn(BSTR sql, IDispatch *pConnect,
IATLRecordset **pRecordSet)
{
  CComObject<CATLRecordset>* pClsRecordset = NULL;
  HRESULT hr = CComObject<CATLRecordset>::CreateInstance(&pClsRecordset);
  if (SUCCEEDED(hr))
  {
   try{
    _ConnectionPtr ptrConn(pConnect);
    ...
   }catch(_com_error& COMErr){
    Error((char*)(COMErr.Description()));
    hr = E_FAIL;
   }
  }

  return hr;
}

But av exception occurs when I try to create an _ConnectionPtr with returned
IDispatch interface. How can I fix this problem?
Thanks in advanced.