DECLARE FUNCTION - DLL

[zzzxtreme]

hi i built a very simple dll with delphi

library Printing;
uses
SysUtils, Classes, Dialogs;
{$R *.res}
function Hello: WideString; stdcall;
begin
ShowMessage('test');
result := 'blah';
end;
exports Hello;
begin end.



In VB.Net, i tired calling it. the ShowMessage executes, so that's a
start. I get this error afterwards, SEHException - "External component
has thrown an exception."

this is how i declared it

Declare Function Hello Lib "Printing.dll" () As String

It fails on returning a string. Does anyone know why?

 

[Juan T. Llibre]

Are you using Delphi 8 (Delphi.Net) ?

If not, you'll only get unmanaged assemblies,
which you'd need to create a wrapper for,
or use the Source Forge version to enable Delphi 5+ for .Net usage:

http://sourceforge.net/projects/delphinet

More info on Delphi 8.0 Basics:
http://www.delphibasics.co.uk/Net.html

 

[zzzxtreme]

thanks i found out the problem

delphi WideString is actually OLE-String.

I just changed to PAnsiChar