Can a vb6 project "see" a .net form?

In vb6 I've add this code to call a vb9 form (DBLocForm - which sets the My.Settings connection string for typed datasets):

Private Sub DBLocactionClick_Click()
On Error Resume Next
Me.Hide()
Unload(Me)
DBPathTimer.enabled = True
DBPathBoolean = True
DBLocForm.SHOW()
End Sub

Private Sub DBPathTimer_Timer()
If DBPathBoolean = True Then
Dim frm As Form
For Each frm In Forms
If frm.Name = "DBLocForm" Then
Exit For
Else
Second = Second + 1
If Second > 2 Then
Call Form_Load()
Me.Visible = True
DBPathBoolean = False
DBPathTimer.enabled = False
End If
End If
Next
End If
End Sub

This seems to work in debug but fails miserably in a live version. What are my options?

Hi DeepMaroon,

You can expose the method to VB6 so that VB6 call that method to implement your requirement.

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Best regards,
Riquel
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
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Are you using the Interop Forms Toolkit?

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Paul ~~~~ Microsoft MVP (Visual Basic)

Yes I am. Thanks for you help.

Could you explain what this code is doing? I'm not exactly sure what the Timer routine is for.

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Paul ~~~~ Microsoft MVP (Visual Basic)

Hi DeepMaroon,

You can expose the method to VB6 so that VB6 call that method to implement your requirement.

---

Best regards,
Riquel
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
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Best regards,
Riquel
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
Welcome to the All-In-One Code Framework! If you have any feedback, please tell us.

On the vb6 project's main form I called an interop vb9 form "DBLocForm" that allows the user to change the program's database location. Basically it calls an OpenFileDialog where the user browses out and selects the Location of the Database on a network. The file path is then saved in a text file which is used as the connection string in opening up vb6 ADODB connections. This new locations is also saved as a UserOverride in vb9's My.Settings.[db]ConnectionString for my TableAdapter's. I needed to hide/close the vb6 project's main form and then call my vb6 project's Login form after the vb9 - DBLocForm is closed (i.e. a new db location has been selected).

Riquel, I don't know how to expose the method to vb6 other then to create an InteropUserContol. So just to test it out, I created a new InteropUserControl Project. I've create a DBPathUserControl that I put on a vb6 form and this works great. Of course this complicates things...

Now I have an InteropFormsProject and an InteropUserControlProject combined with the vb6 project on in one solution. And the Usercontrol and From projects both need to use the same My.Settings Namespace and config. This is only an issue becuase I've never tried it before so I don't know if it's possible. I am just praying that deploying the UserControl as well only requires the additions of the dll file. Is there another way I can expose the "DBPathForm" to vb6 other than to create a user control?

Hi DeepMaroon,

VB6 and VB.NET are different technologies. We can directly pass the data of simple type between two sides(for example integer and double). There is the Interop marshaller for data transferring. You can read this article for your reference about how to expose the method to vb6.
http://msdn.microsoft.com/en-us/library/bb407304(VS.80).aspx

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Best regards,
Riquel
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
Welcome to the All-In-One Code Framework! If you have any feedback, please tell us.