C#, Fortran and dll's

[Kash]

Hi, I am trying to call a Fortran dll in my simple C# example. My Fortran bit looks like this: 'code' subroutine sumit(x,i,r) real , intent(in) :: x(i) integer , intent(in) :: i real , intent(out) :: r ! !DEC$ATTRIBUTES STDCALL, DECORATE dllexport :: sumit !DEC$ATTRIBUTES STDCALL, DECORATE, ALIAS:'sumit' :: sumit ! integer :: j r=0.0 do j=1,i r=r+x(j) end do end subroutine sumit 'code' and my C# bit looks like: 'code' using System; using System.Text; using System.Runtime.InteropServices; namespace ConsoleApplication1 { class MyClass { [DllImport("Dll1.dll", EntryPoint="sumit")] public static extern double sumit(double x,int i,double r); public static void Main() { sumit(10.0,10,0.0); } } } 'code' But I get an exception error System.NullReferenceException. I also tried to add reference but I get an error saying that the extension must be of type .dll but it is already. Can anyone help. Kash

[leppie]

Kash wrote: !DEC$ATTRIBUTES STDCALL, Thats should be CDECL or what ever they use in Fortran. xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots