Fortran dll call from VB.Net

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Below code contains the fortran77 dll call from vb.net with two-dimensional array and struture.Input Parameters are flg & a_in(,),it calculates some value and inturn it

populates the output array in a_pn(,) and a_vOUT(,).There is a addressof callback function used in fortran dll.I couldn't able to fetch the output values to proceed

further.Waiting for your kind reply ASAP.

---VB.Net Code with Fortran dll call---

Dim flg As Int32 Dim a_in(,) As Double --- Input array with values Dim a_PN(,) as Double ----Output array return from Fortran77 DLL (Value calculated from a_in(,) array

and returns) Dim a_vOUT(,) as Double ----Output array return from Fortran77 DLL Dim a_Flgs(,) as Int32 Dim a_b() as byte Dim a_string1 As New VB6.FixedLengthString

(255)

Public Structure Case_Info Dim nx() As Double Dim ny() As Double Dim tc() As Double Dim ip(,) As Double End Structure

W_Ftrn(Flg, a_in(1, 1), a_PN(1, 1),a_vOUT(1, 1), a_Flgs(1, 1), .TC(1), .ip(1, 1),.nx(1), .ny(1), AddressOf CallBack0, AddressOf CallBack1, a_b(1), a_string1.Value, 255)

---Fortran declaration in vb.net--

Public Declare Sub W_Ftrn _ Lib "D:\Proj2\Fortran.DLL" Alias "W_Ftrn" _ (ByRef flg As integer,ByRef a_in As Double, ByRef a_PN As Double, ByRef a_vOUT As Double, ByRef

a_Flgs As Int32, _ ByRef constray As Double, ByRef ipn As Double, _ ByRef aGX%, ByRef aGY#, _ ByVal cbaddr0 As long,ByVal cbaddr1 As long,ByRef bPlain As Byte, _

ByVal s1 As String, ByRef L1 As Int32)