conversion of CString to LPWSTR

hi
every body i have got a problem in my application.

i need to convert CString to LPWSTR

i have tried the code below but its not working

CString m_StructureDetails = _T("this is a CString ");

int len = m_StructureDetails.GetLength();
LPSTR structValue = LPSTR( m_StructureDetails.GetBuffer(len));
m_StructureDetails.ReleaseBuffer();

as well as this


USES_CONVERSION;

LPWSTR structureValues = A2W(m_StructureDetails);

Can any body help me ...

thanks in advance..