C# control needs to notify C++ application

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aaron.m.johnson@gmail.com - 27 Jun 2007 23:09 GMT

I'm writing a C# control that needs to be able to notify the parent
application of certain events. If the application were also using
the .NET platform I'd just use a delegate. Unfortunately the
application is writen in unmanaged C++.

Is there some way for me to send a message or execute a callback from
the control that the application can process?

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Ben Voigt [C++ MVP] - 29 Jun 2007 08:36 GMT

> I'm writing a C# control that needs to be able to notify the parent
> application of certain events. If the application were also using
[quoted text clipped - 3 lines]
> Is there some way for me to send a message or execute a callback from
> the control that the application can process?

For a GUI control, post a notification message to the parent window (see
WM_NOTIFY, BN_CLICKED for example).

For non-GUI components, a function pointer is much like a delegate.
Remember to include an extra parameter set at the time of subscription,
sizeof void* or larger, for the caller to pass his "this" pointer or some
other data he wants.

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C# control needs to notify C++ application

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