How to pass anonymous function to an object method implemented by BHO, and ivoke it at a later time?

Question

How to pass anonymous function to an object method implemented by BHO, and ivoke it at a later time, i.e.:

// javascript
window.bho.addEventListener('event', function() { alert('test') }, false);

// c#
public void addEventListener(String eventName, Object closure, Boolean useCapture)
{
    ...
    // invoke a function
}

I assume we could use sink objects or reflection to get a MethodInfo or Delegate, to store the object passed in the second parameter in a list and then invoke it at a later time... but I couldn't figure out how to do that.

Answer 1

The objects are of type IDispatch but you need to invoke via IDispatchEx if the event handler supports that. Otherwise just invoke the IDispatch implementation. The dispid to invoke is 0 (DISPID_VALUE).

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Answer 2

Thanks a lot,

Could you demonstrate some example of C# code?

Answer 3

The code to invoke IDispatch is linked above. For invoking IDispatchEx, check https://groups.google.com/d/topic/microsoft.public.dotnet.framework.interop/HkZgGxq8jIQ/discussion

By the way addEventListener does not sound like it would invoke the function. If you indeed want to invoke the functions in this method, change the method name to be more descriptive about what it does.

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