[RESOLVED] Using Callbacks

Hi,

I hope no one minds, but I figured I would create a new thread since my topic and question changed in my previous one.

I am not working with Callbacks and still very unsure of how they work.

I looked over the Sample here ---> http://msdn.microsoft.com/en-us/libr...=vs.71%29.aspx but it does not all make sense.

I have a module in my 2nd project like so.

vb.net Code:

Module ModuleSend
 
    Public Delegate Sub CallKey()
 
    Public SendCallBack As CallKey = Nothing
 
 
    Public Sub Invoke()
        Try
            If Not SendCallBack Is Nothing Then
                SendCallBack.Invoke()
            End If
        Catch
        End Try
 
    End Sub
 
End Module

Now I want to be able use this in the main project

vb.net Code:

ModuleSend.SendKeyCallBack = AddressOf Main.Do

But even though SendKeyCallBack is declared in the module it says it is not declared. any ideas?

Sorry, I don't know much about callbacks but, why is the "Public SendKeyCallBack As CallSendKey = Nothing" ? Looking through the link you posted above it doesn't say anything about any code like that, maybe this is where your problem lies? Or maybe because "CallSendKey" is set to nothing.

Quote:

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Originally Posted by DamnNation

Sorry, I don't know much about callbacks but, why is the "Public SendKeyCallBack As CallSendKey = Nothing" ? Looking through the link you posted above it doesn't say anything about any code like that, maybe this is where your problem lies? Or maybe because "CallSendKey" is set to nothing.

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Even when it is set to something it is the same problem.
EDIT: Silly me, forgot to make the Module public :P

Modules default to "Friend" in VB.Net, so if you're trying to reference something in it from another project in the solution, it will not be able to resolve it.

Quote:

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Originally Posted by Niya

Modules default to "Friend" in VB.Net, so if you're trying to reference something in it from another project in the solution, it will not be able to resolve it.

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Thank You very much :) Changing it to public solved the problem and I did not know they defaulted to Friend in vb!

Call backs are an interesting tool.