Null check on a COleVariant

Is 开发者_高级运维it possible to do a null check on a COleVariant or at the very least check if it's type is set to VT_NULL? I see that there is a ChangeType() method but was hoping I could somehow figure out what the current type was before I attempt to change the type as changing from VT_NULL to VT_INT throws a type mismatch.

Check the vt member.