iunknown

DISCLAIMER I DO NOT USE BOOST OR OTHER LIBRARIES Finally I've learned how PointerToMemberFunction works. This is my example code . #include <iostream> using namespace std; class Foo { public: void foo ( ) { cout << "I'm a foo method\n"; }; }; class Bar { public: void bar ( Foo* fooPtr , void(Foo::*fooFnPtr)() ) { (fooPtr->*fooFnPtr)(); }; }; int main() { Foo* foo = new Foo(); Bar* bar = new Bar(); bar->bar ( foo , &Foo::foo ); return 0; } Now, what the problem is. Bar::bar must be modified somehow, because in real project it won't know, what class fooFnPtr is a pointer to . In other words Bar:

recently I have been encountering problems with exposing events from .NET to COM. I have been successful with this example (conceptually taken from http://blogs.msdn.com/andreww/archive/2008/10/13/exposing-events-from-managed-add-in-objects.aspx ): // The delegate type for our custom event. [ComVisible(false)] public delegate void SomeEventHandler(object sender, EventArgs e); // Outgoing (source/event) interface. [ComVisible(true)] [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)] public interface IAddInEvents { [DispId(1)] void SomeEvent(object sender, EventArgs e); } [ComVisible(true)]

We're using some old code (ComLib.pas created by Binh Ly) so we can use the enumeration interface on an (OleVariant) object: type TDispNewEnum = dispinterface ['{97079E31-6957-11D2-9154-0000B4552A26}'] // dummy property _NewEnum: IUnknown readonly dispid -4; // DISPID_NEWENUM function _NewEnumFunc: IUnknown; dispid -4; // DISPID_NEWENUM end; procedure TEnumVariant.AttachUnknown (const Unk: IUnknown); var pDisp: IDispatch; _NewEnumPropFailed: boolean; Unknown: IUnknown; begin Detach; Unknown := Unk; { extract IEnumVariant } if (Unknown <> nil) then begin { try IEnumVariant } if not (Succeeded