CComBSTR::operator !

bool operator !( );

Remarks

Returns true if the m_str member is NULL; otherwise, false.

Example

STDMETHODIMP CPolyCtl::BSTRToUpper(BSTR bstrConv)
{
   // assign bstrConv to m_str member of CComBSTR
   CComBSTR bstrTemp;
   bstrTemp.Attach(bstrConv); 

   // make sure BSTR is not NULL string
   if(!bstrTemp)
   {
      // Make string uppercase 
      bstrTemp.ToUpper();

      // set m_str to NULL, so the BSTR is not freed
      bstrTemp.Detach(); 

      return S_OK; 
   }
   return E_POINTER;
}

CComBSTR Overview |  Class Members