BCGControlBar Pro for MFC
BOOL CBCGPWorkspace::WriteDouble ( LPCTSTR  lpszEntry,
double  dblValue 

Stores double data in a specified value field.

If successful, returns nonzero; otherwise 0.
lpszEntrySpecifies the value field to be set. If a value field with this name does not already exist in the key, it is added.
dblValueSpecifies the data to be stored.