The problem is that how to clean the COM object in assembly since this is like two ways Interop.

If I use "ref object" parameter in assembly, I don't need to clean it in assembly. After OCX is unloaded, it should go away with OCX.
But the host process is still there(OCX and assembly are leaving there too?), when reloading OCX, OCX pointer should send to assembly again. But don't know why OCX's constructor get called, then OCX get unloaded (other OCX memory get corrupted)?


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