#include <db_cxx.h> int Db::get_blob_dir(const char **dirp);
         The Db::get_blob_dir() method returns
         the directory location where blob data is stored. The default
         location can be set using Db::set_blob_dir(). Use this method only
         if the database was not opened in an environment. If the database
         was opened within an encompassing environment, use 
         DbEnv::get_blob_dir() instead.
    
         The Db::get_blob_dir() method always
         returns 0 to indicate success.