Why is this Fortran DLL not being read by my VB.NET application? -

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i trying link fortran dynamic-link-library (dll) vb.net application. subroutine contained in dll supposed modify value c provided in vb side, not doing it: keeps c is.

here fortran code:

subroutine prueba_int(m,n,p) !dec$ attributes dllexport, decorate, alias : "prueba_int" :: prueba_int !dec$ attributes reference :: m,n implicit none integer, intent(in) :: m,n integer,intent(out) :: p  p=m*n  end subroutine

and here vb.net section:

public class form1 public declare sub prueba_int lib "dll2.dll path" (byref m integer, byref n integer, byref p integer) private sub btn1_click(sender object, e eventargs) handles btn1.click     ofd.filter = "(*txt)|*.txt"     if (ofd.showdialog() = dialogresult.ok)         txtarray.text = ofd.filename     end if end sub  private sub btncalc_click(sender object, e eventargs) handles btncalc.click     dim a, b, c integer     = cint(txt1.text)     b = cint(txt2.text)     c = 1     call prueba_int(a, b, c)     msgbox(c) 'only check c's value end sub end class

i have tried using long instead of integer, problem remained. can give me clue issue?

edit: both vb.net , fortran codes programmed using visual studio 2015 intel fortran compiler (parallel xe 2017). dll built using stdcall(/iface:stdcall) calling convention.

i have found solution. thing did changing export line one:

!dec$ attributes dllexport, stdcall, reference, alias : "prueba_int" :: prueba_int

!dec$ attributes reference :: m,n

now works! thread useful, if else has same problem: https://software.intel.com/en-us/forums/intel-visual-fortran-compiler-for-windows/topic/276310





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