I am trying to open a form defined in a VB activeX DLL from a C# client in non modal way.

On the VB side I have a form (myForm) and an exposed class (myVBclass):

public function getFormHandle() as long
   getFormHandle = myForm.hWnd
end function

public sub showForm()
   myForm.show
end function

On the C# side I instantiate the ActiveX dll (converted with tlbimp), create an object of type myVBclass:

myVBclass vbClass = new myVBclass();
long hwnd = vbClass.getFormHandle();  // this works!
vbClass.showForm();  // this does not works, only modal show is allowed

In C++ there was the same problem, but you could get around that via attaching an MFC CWnd object to the HWND returned by VB, then doing Show of the CWnd object.
CWnd pWnd;
pWnd.Attach(hWnd);
pWnd.ShowWindow(SW_SHOW);

How can I do the same thing in C#?

Thanks

Regards,
Fabio

Hi,
The reason the Form is being shown as Modal is 'cos an ActiveX dll is run in the same process as the calling procedure. Therefore the procedure cannot continue until you dispose of the call to the dll.
Why not make the VB side into an Out-Of-Process ActiveX exe which will run in its own thread and therefore not be modal?


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