Exception occurs when native Dialog System program calls managed WinForm

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over 8 years ago

PROBLEM:

Customer has a native Dialog System application that displays a window on which an ActiveX control resides.

This native application displays this Dialog System window and then calls a managed code .Net WinForm application that displays a Windows Form which also has an ActiveX control on it.

When the program does this it gets the following exception:

    Application Exception  A device attached to the system is not functioning.

What is causing this to occur?

RESOLUTION:

Try setting the following environment variable in your computers environment

MFOLECL_NO_THREAD_INIT=ON

This is a problem that is caused by the Micro Focus native OLE support calling CoInitialize on a thread that it did not own, mainly the managed code thread.

If this environment variable is set the OLE support will not try to initialize a thread that it does not own.

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