It is used for getting the current header information
Example code
CComPtr<ISmpReport>m_SmpReport;
HRESULT hr=SmpReport.CoCreateInstance(CLSID_SmpReport);
BSTR bstrMainHeading1,bstrSubHeading1,bstrMainHeading2,bstrSubHeading2,bstrHeaderImagePath;
m_SmpReport->GetHeaderInfo(&m_bstrMainHeading1,&m_bstrSubHeading1,&m_bstrMainHeading2,&m_bstrSubHeading2,&m_bstrHeaderImagePath);