const bson_value_t *
mongoc_gridfs_file_get_id (mongoc_gridfs_file_t *file);
- A mongoc_gridfs_file_t \&.
Fetches the id of a gridfs file.
The C Driver always uses an ObjectId for _id , but files created by other drivers may have any type of _id \&.
Returns a const bson_value_t * that should not be modified or freed.