Convert Delphi interface to COM interface

Delphi is compatible with the Data Types of COM. Otherwise, it is not true.

Here is a simple example:

// Delphi
Procedure tyn. save2 (data: olevariant; out errcount: integer );
Begin
Dspunit. applyupdates (data, 0, errcount );
End;

// Com
Procedure tyn. Save (data: olevariant; out errcount: sysint );
Begin
Save2 (data, errcount );
End;

Value of this example:
If you port the previous two layers to multiple layers, you can retain the original service class.
However, there is no doubt that data types need to be converted.