Using OO component in VB.net

Question

Hello all,

I need to use an object oriented component in my VB.net app, according to its help:

Initialize it in the main app form and inherit it to other forms to avoid crashes (SDK is inside the common App garbage collection)
If you are inside any form, wait in your app until the thread is ended.
Make a thread checker inside each form.
You have to delegate (keyword) them and also you have to add them to the form (marshal the events)

My skill level is basic, not sure how to inherit to other forms and wait for thread end, and a thread checker for each form.

Anyone can shortly advise with this?

For example, I define this in main form:

Friend WithEvents MyOOSDK As Blah

How to inherit to other forms?

Thanks in advance :)

Answer 1

Hi @Peter Volz ,

Please check if the following code helps.

Public Class MainForm
    Private WithEvents MyOOSDK As Blah

    Public Sub New()
        InitializeComponent()
        MyOOSDK = New Blah()
    End Sub

    ' Event handler for the SDK component's events
    Private Sub MyOOSDK_EventOccurred(sender As Object, e As EventArgs) Handles MyOOSDK.EventOccurred
        If Me.InvokeRequired Then
            Me.Invoke(Sub() MyOOSDK_EventOccurred(sender, e))
        Else
            ' Handle the event on the UI thread
        End If
    End Sub

    ' Method to start a new thread
    Private Sub StartThread()
        Dim myThread As New Thread(AddressOf YourThreadMethod)
        myThread.Start()
        myThread.Join() ' Wait for the thread to finish
    End Sub
End Class

Create a base form (let's say BaseForm) that inherits from MainForm. This base form will contain the MyOOSDK object and its associated event handlers.

Public Class BaseForm
    Inherits MainForm

    ' Thread checker method for UI thread
    Private Sub CheckUIThread()
        If Not Me.InvokeRequired Then
            ' Code that should run on the UI thread
        Else
            Throw New InvalidOperationException("Method must be called on the UI thread.")
        End If
    End Sub
End Class

Then create other forms that inherit from BaseForm. These forms will have access to the MyOOSDK object and its event handlers as well.

Public Class OtherForm
    Inherits BaseForm

    ' You can use MyOOSDK and its events here
    Private Sub SomeMethod()
        CheckUIThread() ' Ensure we are on the UI thread

        ' Code that interacts with UI elements
    End Sub
End Class

Best Regards.

Jiachen Li

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