Question

How to call a VB dll from a VB executable

Asked by: John500

I have a dll project (sockets) that looks like the picture below.

I have a VB service I want to call the dll from but I'm testing first with a VB executable.

If I add an executable project to my solution, what code exactly would I need to call the dll and kick this show off?

Please provide code and thanks in advance!!

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Asked On
2009-09-02 at 11:05:37ID24702232
Tags

VB .NET

,

Sockets

Topics

Winsock

,

Visual Basic Programming

,

Signal Processing

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: Idle_MindPosted on 2009-09-02 at 14:22:09ID: 25245821

Hi John,

I haven't played with using DLLs too much...is everything written in .Net?

...so, I just whipped up a quick example...not sure if it applies to your scenario.  =\

First I Created a New Class Project with this silly code:

    Public Class Class1

        Public Function ToUpper(ByVal lower As String) As String
            Return lower.ToUpper
        End Function

    End Class

Then I saved it and hit the Build button.

Next I created a New Windows Forms application and clicked on Project --> Add Reference.  After switching to the Browse tab, I navigated out to the "\bin\release" folder of the Class Project above and double clicked on the DLL (which was "ClassLibary1.dll" in my case).

Finally ,I added a Button and this code that creates an instance of the DLL and uses the ToUpper() function from it:

    Public Class Form1

        Dim c1 As New ClassLibrary1.Class1

        Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
            Dim txt As String = "hello world!"
            txt = c1.ToUpper(txt)
            MessageBox.Show(txt)
        End Sub

    End Class

Does that shed any light?

 

by: John500Posted on 2009-09-02 at 16:49:07ID: 25246778

Wow, yes.  That shes the light!

I'll be using this in a service.  Now that I know how to link the service to the dll I'd love to be able to understand or associate the files (in the project picture above) so that I can call the dll correctly:

Interface
     Client
     Server
     Session
     Socket

Socket
     Client
     Server
     Session
     Socket

What's the chances of taking a look at this project I downloaded from Wiki :

http://gpwiki.org/index.php/Files:Socket.zip  

The link looks like this at the bottom/middle of the page:        VBNET:Sockets

I'm just wondering what the relationship is between the files in order to make sensible calls.  I want my service to start up one of these routines as they were intended to be called.

What do you think ??

Thanks!

 

by: John500Posted on 2009-09-02 at 16:51:33ID: 25246795

I was wrong, I forgot it's the link at the top of the page and looks like this -->  Socket.zip

http://gpwiki.org/images/9/9b/Socket.zip

 

by: Idle_MindPosted on 2009-09-02 at 19:14:32ID: 25247373

I'll see if I can take a peek later tonight or tomorrow morning..  =)

 

by: RQuadlingPosted on 2009-09-03 at 01:55:48ID: 25248852

Jon, if you've already built the DLL, then http://support.microsoft.com/kb/106553 contains details on calling a DLL from within VB - Section B 2.0 Calling DLLs from Visual Basic

 

by: John500Posted on 2009-09-03 at 05:54:53ID: 25250121

Since Idle_mind has answered this question I feel I should close this out and start another one.  The new question is here:

http://www.experts-exchange.com/Programming/Languages/Winsock/Q_24704379.html

I took a look at the microsoft article but this is just a bit to vague for my situation.  I need the specifics as they relate to the socket project I have.

Please see the new question and thanks - both of you.

 

by: John500Posted on 2009-09-03 at 07:54:12ID: 25251299

Also, in the new question I started, I provided the link to the discussion that goes with this project.  I could just use another set of eyes for the new question.  All the code is provided and should only require little modification.

http://www.experts-exchange.com/Programming/Languages/Winsock/Q_24704379.html

Thanks!

20120131-EE-VQP-002

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