Hi,

I've created a simple C++ MFC Active control in Vis Studio.NET.
I've also created a simple C# application that references the OCX.

/***************************
TestLib.TestClass ts = new TestLib.TestClass();

try
{
  ts.Test();
}
catch(Exception Ex)
{
   System.Windows.Forms.MessageBox.Show(Ex.Message, Ex.GetType().ToString());
}
***************************/


I can instantiate the OCX no problem but when I call a function
in the OCX I get the exception

'System.Runtime.InteropServices.COMException' occurred in mscorlib.dll
Additional information: Catastrophic failure

The ActiveX control has absolutely no additional code other than
that created by VS.NET.

Thanks,

James.

Have you already found a solution for this problem? If you have, please send me the solution!
[email protected]

Thanks.

I would suggest you to create a Runtime Callable Wrapper yourself if you were creating a simple COM component. But it is an ActiveX control you are creating so all you have to do is Add the control to your Toolbox using Add/Remove Items... , drop the control on you form and then use the control variable to call the methods.

Ankur Verma
.Net and C++ Specialist
Wiley Tech Support

Add the following function in ur MFC Active control class, since u r not using a window to host ur activex

BOOL IsInvokeAllowed(DISPID dispid);

BOOL CYourActvxCtrl::IsInvokeAllowed(DISPID dispid)
{
        return TRUE;
}

Note: I checked in VC 6. wil be the same in ur case.

I write a custom MFC Activex and using it with .net (visual studio 2010) I have the same issue:
'Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))'

I resolved the problem in this way:
- Use vs wizard to add method and event on Activex
- Import activex from .net with the design-time on form (not directly from code)

Now when I call my custom activex function all works well..