Call C++ COM IDispatch interface from a background thread in C#

Asked Mar 29 '15 at 06:40

Active Mar 29 '15 at 06:40

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So I have a c++ ATL COM component, which calls my C# component that exposes a COM visible interface.The ATL COM component passes an Interface pointer to my C# component so my c# code can call back into the ATL object. the ATL component is used in a windows forms app.

OK so, in order to do its work, the c# component needs to spin a thread and watch for things to happen.

Here is my question. Can I safely access, in managed code background thread an object that is a an interface pointer to an STA object?

in c++ classic COM, you need to marshal and unmarshal the interface. do i need to do that in managed code? if so how?

asked Mar 29 '15 at 06:40

dgorti

2

The CLR automatically marshals when it converts *object* to `IDispatch*`. Or more typically *dynamic* in your source code, it is *object* at runtime. You don't have to help. – Hans Passant Mar 29 '15 at 10:22
OK It is a little concerning to depend on the :magic: – dgorti Mar 29 '15 at 22:54
Then use a debugger to verify and make you feel good. – Hans Passant Mar 29 '15 at 23:09

Call C++ COM IDispatch interface from a background thread in C#

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