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delphidelphi-2010rtti

How to set event handlers via new RTTI? [D2010]

Playing with new RTTI module, I couldn't find a way to set an event handler with the new utilities. Trying something like this:

LProp := TRttiContext.Create.GetType(Form1.ClassInfo).AsInstance.GetProperty('OnClick');
LProp.SetValue(Form1, {a TValue!});

SetValue needs a TValue passed but I've yet to find a way to represent a TMethod via a TValue. Any comments?

ps. And a side question.. It seems prefixing RTTI variables with "L" is a convention (and a good one IMO, meta code turns into a puzzle real quick). But what does it actually stand for?

Solution

  • You can make TValue contain a value of an aribtrary type with the From method. Try something like this:

    lValue := TValue.From<TNotifyEvent>(eventHandler);

    BTW I think the L just means a Local variable.