Passing string as const string

[IAdams]

I have a C# dll that is called from Delphi (version 6). The parameters for the C# method are <string,string,string,...> but for some reason Delphi is insisting on <const: widestring,const: widestring,const: widestring,...> as the passed-in parms. However, I need to reassign these fields in a loop and call the routine many times.

How can I either: relax the const requirement or assign a varying string to a const string?

Thanks,

 

[Duoas]

Wow, sorry to respond so late...

The C# method is asking for a widestring reference and promising not to modify the string.

You can use both ansistring and widestring together, and assign the one to the other:

var
  astr: ansistring;
  wstr: widestring;
begin
  astr := 'Hello world!';
  wstr := astr;
  MessageBoxW( 0, pWideChar(wstr), 'A message', MB_OK or MB_TASKMODAL )
end;

I'm pretty sure that Delphi VCL functions (like ShowMessage) can take widestrings too, but I've been playing with C++ for the past few months so I don't remember exactly...

Hope this helps (in time). :-\