URGENT!! Help me read ClsID From ProgramID

Hi,

I want to get ClsID from ProgID
I'm using

HRESULT CLSIDFromProgID( LPCOLESTR lpszProgID, //Pointer to the ProgID
LPCLSID pclsid //Pointer to the CLSID);


My ProgID is "MY.COMCLASS.1"
How to pass this ProgID to above func in LPCOLESTR form and get clsid in CLSID format.

Thanks in advance
Shalini