Build .NET Interop Assembly

[teoprimo]

Now, I'm not sure about my name!

This is the right version of the project.

About VB.net I'm a noob...

Code: 

Imports System.Windows
Imports nsfiltroBW

Public Class Form1


    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        Dim ingresso(2000) As Double
        Dim j As Integer
        Dim uscita(2000) As Double

        For j = 0 To 2000
            ingresso(j) = j
        Next

        'usando la DLL
        'Dim prova As New nsfiltroBW.cnfiltroBW()
        uscita = nsfiltroBW.cnfiltroBW.filtroxVB(uscita, ingresso)

        Dim presi(2000) As Double
        presi = uscita

    End Sub


End Class

[smercurio_fc]

The line

uscita = nsfiltroBW.cnfiltroBW.filtroxVB(uscita, ingresso)

is incorrect. Since the function takes in an array as the first parameter, and modifies it, you need to pass the array by reference. This is done by using the keyword ByRef. Thus the line would be

nsfiltroBW.cnfiltroBW.filtroxVB(ByRef uscita, ingresso)

You should not be returning the array as the function's return value if you're already passing it in as a parameter of the function.

[teoprimo]

 nsfiltroBW.cnfiltroBW.filtroxVB(ByRef uscita, ingresso)

 this expression doesn't work: "Expression expted." ByRef is underlined in cyan.

?!?!?!

Thank you! 🙂

[smercurio_fc]

Sorry. Not sure where my brain was. I program in C#, not VB.NET. The line nsfiltroBW.cnfiltroBW.filtroxVB(uscita, ingresso) should be fine.

[teoprimo]

But it doesn't work and I don't understand why...

[smercurio_fc]

I don't know how you can expect anybody to help when all you say is "it doesn't work" without providing any details as to what, exactly doesn't work. If I went to my car mechanic and said "my car doesn't work, what will it cost to fix it?" he'd probably just laugh at me.

[teoprimo]

I said it in a previous post: "There is no error but, when VB calls the library, it opens a white labview interface and it stops to work (no feedback, just this interface)." 😛

I also add a capture of my screen to make it clear 🙂

[smercurio_fc · Accepted solution]

Sorry, I thought you were talking about getting an error in the VB.NET code. Did you copy the "data" folder that is created by the build of the interop assembly into the VB.NET folder? This folder contains the LabVIEW Advanced Analysis library, which contains the filter funtion your LabVIEW code is using. Thus, your interop DLL and the "data" folder should be in the same folder as the VB.NET application.

[teoprimo]

Ok! You win! 😄

It's easier than I think!

I'm surprised...I've added .dll to the project and VB.net takes a copy of it in project folders without "data".

I suppose that it calls library position and doesn't copy .dll!

Thank you so much