E2160 Type not allowed in OLE Automation call (Object Pascal)
If a data type cannot be converted by the compiler into a Variant, then it is not allowed in an OLE automation call.
program Produce; type Base = class x : Integer; end; var B : Base; V : Variant; begin V.Dispatch(B); end.
A class cannot be converted into a Variant type, so it is not allowed in an OLE call.
program Solve; type Base = class x : Integer; end; var B : Base; V : Variant; begin V.Dispatch(B.i); end.
The only solution to this problem is to manually convert these data types to Variants or to only use data types that can automatically be converted into a Variant.