Queries the item at position item_index in model for the attribute specified by attribute.
If expected_type is non-NULL then it specifies the expected type of the attribute. If it is NULL then any type will be accepted.
If the attribute exists and matches expected_type (or if the expected type is unspecified) then the value is returned.
If the attribute does not exist, or does not match the expected type then NULL is returned.
the index of the item
the attribute to query
the expected type of the attribute, or NULL
the value of the attribute
2.32
Queries the item at position item_index in model for the attribute specified by attribute.
If expected_type is non-NULL then it specifies the expected type of the attribute. If it is NULL then any type will be accepted.
If the attribute exists and matches expected_type (or if the expected type is unspecified) then the value is returned.
If the attribute does not exist, or does not match the expected type then NULL is returned.