corman-DLL from .NET?

I have the following sample-DLL code, which works fine when called  
from a delphi-enviroment. Now I want to try it from a .NET-enviroment 
where I import the DLL as unmanaged code.

(ct:defun-dll-export-c-function (hpwtest "testlisp") ((str (:char *)))
	"char* testlisp()"
	(let ((test nil)))
	(if (setq test(ignore-errors(eval(read-from-string (ct:c-
string-to-lisp-string str)))))
	 (ct:lisp-string-to-c-string test)
	 (ct:lisp-string-to-c-string "ERROR")))


I called it first by sending this string:
(setq a "Test1" b "Test2" c "Test3")

In the second and all subsequent calls I send this string:
(concatenate 'string (eval a)" "(eval b)" "(eval c))

In .NET it works fine for 10-20 calls then I get an error:

System.Reflection.TargetInvocationException: Ein Aufrufziel hat einen 
Ausnahmefehler verursacht. ---> System.NullReferenceException: Der 
Objektverweis wurde nicht auf eine Objektinstanz festgelegt.

Has anyone successfully called DLL from .NET?

Hans-Peter



------------------------ Yahoo! Groups Sponsor ---------------------~-->
Get A Free Psychic Reading! Your Online Answer To Life's Important Questions.
http://us.click.yahoo.com/Lj3uPC/Me7FAA/ySSFAA/SyjtlB/TM
---------------------------------------------------------------------~->

To unsubscribe from this group, send an email to:
[email protected]

 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/