Michael Van Canneyt via fpc-pascal <fpc-pascal@lists.freepascal.org> schrieb am Fr., 23. Dez. 2022, 10:48:
> > > On Fri, 23 Dec 2022, Sven Barth via fpc-pascal wrote: > > > Michael Van Canneyt via fpc-pascal <fpc-pascal@lists.freepascal.org> > > schrieb am Fr., 23. Dez. 2022, 08:18: > > > >> > >> > >> On Thu, 22 Dec 2022, Andrew Haines via fpc-pascal wrote: > >> > >>> Hi what I want to do is similar to this question here: > >>> > >> > https://en.delphipraxis.net/topic/423-rtti-determine-record-helper-type-for-a-base-type/ > >>> > >>> I am going to create multiple type helpers for enums and I would like > to > >> look > >>> up the helper and use common methods AsString AsOrdinal to get/set the > >>> values. I am recieving them as json that I dont have control over. I am > >> using > >>> typeinfo to fill in all the properties but I would like to convert the > >>> strings I am receiving to the enum values semi-automatically. > >>> > >>> LString := 'STATUS'; > >>> > >>> LHelper := GetHelper(LPropInfo^.PropType); // enum proptype > >> > >> Since there can be multiple type helpers for a type, this will never be > >> possible. At best you would get a list. > >> > >> But I don't think there is even a list of type helpers per type. > >> Sven will need to confirm. > >> > > > > As the active helper(s) for a type change(s) depending on the current > scope > > (e.g. in unit A it might be a different helper than in unit B) this is > not > > possible. Also helpers are not in any way usable on their own except to > > retrieve their RTTI information. > > But theoretically it should be possible to generate and get a list of all > defined type helpers, whether they are in scope or not ? > No, because the compiler doesn't keep track of that. It's only interested in what is in scope *right now*. > If their RTTI could include a function that returns an interface, you could > retrieve that and do as the OP suggests.. > Don't make helpers to something that they're simply not there for. Regards, Sven
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