Working with VB.net and VB6 together

mountainyman

I wonder if someone can help me.

I have a VB.net application which is trying to open a VB6 Application.
I have added the dll for the VB6 app.
I have referenced the dll in my VB.net app.
The vb6 reference is called VB6Departments

Now when I type VB6Departments I can see a method in the VB6 app which is called LaunchDepts.

It then prompts me for (byref idept as int) BUT when I try to pass in
my own idept variable it throws an error.

The error is

Object Variable or With Block Variable not set

Any suggestions.

Saint_Mel

What error does it throw?

Ginger

VB.NET int is a VB Long due to the size differences ...

mountainyman

The error is

Object Variable or With Block Variable not set

But a long can be passed to an int can't it? provided that the values are in the permitted range of an int.

Ginger

Have you created the VB.NET wrapper classes for the VB6 application

Usually its Tlbimp MyCOMComponent.dll /out:MyRCW.dll

then you can reference MyRCW.dll to access your COM assets

http://articles.techrepublic.com.com/5100-10878_11-5034862.html?tag=rbxccnbtr1

http://articles.techrepublic.com.com/5100-10878_11-5025239.html?tag=rbxccnbtr1

http://msdn.microsoft.com/en-us/library/tt0cf3sx(VS.80).aspx

http://msdn.microsoft.com/en-us/library/ms364069(vs.80).aspx#vbbestprac_topic1 and scroll down to the types comparison

VB.NET INT = VB6 LONG ... so use a SHORT for your INTEGER variable

mountainyman

Thanks for all earlier help.
Am calling the VB6 program but now get the error

Non-modal forms cannot be displayed in this host application from an ActiveX DLL
(Error 406)

Anyone able to point me in the right direction?

Regards

MM

Ginger

http://support.microsoft.com/default.aspx?scid=kb;en-us;247791

If App.NonModalAllowed Then
frmModeless.Show vbModeless
Else
frmModeless.Show vbModal
End If

mountainyman

Thanks alot. I cuiled fro that a good few times but your link really did the trick.

Thanks

Ginger

I love it when a plan comes together!