Ryan Joseph via fpc-pascal <fpc-pascal@lists.freepascal.org> schrieb am Mo., 5. Apr. 2021, 05:58:
> > > > On Apr 4, 2021, at 2:36 PM, Sven Barth via fpc-pascal < > fpc-pascal@lists.freepascal.org> wrote: > > > > The RTTI streaming relies on *published properties* (and published > methods for the event handlers). > > Sorry Sven, I'm not understand what I'm doing wrong. From original example > "scale" is a published property right? So FieldAddress only works on > published fields, which are not supported unless they are > classes/interfaces. > > type > TSomething = class(TPersistent) > private > m_scale: integer; > published > property scale: integer read m_scale write m_scale; > end; > > I have used published properties like this for JSON streaming, i.e.: > > type > TVectorObject = class(TPersistent) > private > components: array[0..2] of integer; > published > property x: integer read components[0] write components[0]; > property y: integer read components[1] write components[1]; > property z: integer read components[2] write components[2]; > end; > > which works just fine so I assume I can use the RTTI functions, just not > FieldAddress. > Correct. You need to use GetOrdProp and similar from the TypInfo unit or the object oriented variant from the Rtti unit. Note: you don't need to inherit from TPersistent if you simply want to manually access such properties, setting $M+ before the type (and resetting it afterwards) is enough to enable the published section. Regards, Sven >
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