How do I access Delphi Array Properties using RTTI

Question

I'm familiar with using Delphi RTTI to access "simple" properties (ints/enums/strings, etc) but I cannot grasp how to work with Array properties.

I'm starting by looking for array equivalents for the GetPropValue/SetPropValue calls. I'd expect to see similar ones to these, but taking an extra "index" parameter, but can't seem to find anything in the typinfo unit help.

Do you mean "properties of array type", or "indexed properties", here? — Pavel Minaev
– Pavel Minaev, Commented Jul 27, 2009 at 21:19
I mean these: "Property Coords[Index: Integer] : Longint read GetCoord write SetCoord;" hopefully that's an array property? — Roddy
– Roddy, Commented Jul 27, 2009 at 21:29

Mason Wheeler · Accepted Answer · 2009-07-27 23:54:42Z

5

Arrays and array properties can't have RTTI for them up to D2009. But when Barry Kelly spoke at the Delphi Live conference about an enhanced RTTI system that's planned for D2010, he mentioned that everything, including arrays, would have RTTI available. So this is a feature to look forward to...

edited Jul 27, 2009 at 23:54

answered Jul 27, 2009 at 21:23

Mason Wheeler

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Barry Kelly Over a year ago

Arrays have RTTI - pretty much all types will have RTTI. "Array properties", i.e. indexed properties, not in D+1 though.

Mason Wheeler Over a year ago

Oh, they won't? I must have misunderstood then.

Arioch 'The Over a year ago

@BarryKelly better not use "indexed properties" moniker here, because it naturally sends (and probably officially designates too) to TPropInfo.Index which represents structures like property X: TCoord read GetCoord index 0; property Y: TCoord read GetCoord index 1; - those are perfectly supported in old/classic RTTI (unit TypInfo)

Toon Krijthe · Accepted Answer · 2009-07-27 21:16:56Z

3

Not sure if it is possible. Array properties can't be published which implies they can't have RTTI.

Also, if you look at the components in the object inspector. There are no array properties there. All array properties have custom editors (Or I must have missed some).

answered Jul 27, 2009 at 21:16

Toon Krijthe

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