Empty string becomes null when passed from Delphi to C# as a function argument

Question

I have a native Delphi exe which calls into C# dll via COM interop. Here\'s the simplest case which demonstrate this issue:

Delphi:

IClass1 = interfa         


        

Answer 1

To avoid errors by null pointers you can send an empty character with Chr (#0) or AnsiChar(#0) instead of '' that returns a null.