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John Kouraklis

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John Kouraklis last won the day on January 10

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  1. John Kouraklis

    How to iterate a TDictionary using RTTI and TValue

    Thanks Remy--Always good to learn
  2. John Kouraklis

    How to iterate a TDictionary using RTTI and TValue

    Remy, thanks for the explanation and for sharing your knowledge 👍. I admit that even if I had gone all the way down to retrieve the enumerators I would never have thought to Invoke them. I use 10.3.3 and the first instance of TKey in System.Generics.Collections is this: ------> This is line 748 (*$HPPEMIT END OPENNAMESPACE*) (*$HPPEMIT END ' template<typename TKey, typename TValue>'*) (*$HPPEMIT END ' inline __fastcall TPair__2<TKey, TValue>::TPair__2(const TKey AKey, const TValue AValue) :'*) (*$HPPEMIT END ' Key(AKey), Value(AValue)'*) (*$HPPEMIT END ' {}'*) (*$HPPEMIT END CLOSENAMESPACE*) [HPPGEN(HPPGenAttribute.mkNonPackage)] TPair<TKey,TValue> = record Key: TKey; Value: TValue; constructor Create(const AKey: TKey; const AValue: TValue); end; // Hash table using linear probing TDictionary<TKey,TValue> = class(TEnumerable<TPair<TKey,TValue>>) private type TItem = record HashCode: Integer; Key: TKey; Value: TValue; end; TItemArray = array of TItem;
  3. John Kouraklis

    How to iterate a TDictionary using RTTI and TValue

    @Remy Lebeau Wow....Amazing and complicated stuff. So I really need to drill down to the enumerator to get hold of the pairs. Thanks a lot for this!!! You mentioned that it might be unreliable to do this with generics. Do you think the app may crash for more complex dictionaries? Because it doesn't exist. For a dictionary, TKey and TValue are Generic parameters of the TDictionary class. They are not standalone concrete types, like you are thinking of. And out of curiosity, how does the compiler recognise TKey then? It must be from the HPPEMIT directive, right?
  4. John Kouraklis

    How to iterate a TDictionary using RTTI and TValue

    The whole code is part of a serialiser, so the dictionary type is unknown to the RTTI code. In the code above, I replaced TKey with string because I couldn't find the declaration of TKey.
  5. John Kouraklis

    How to iterate a TDictionary using RTTI and TValue

    Ok, now the more important problem as stated in the beginning. In this code, genDict throws an exception although propValue is correct program Project1; {$APPTYPE CONSOLE} {$R *.res} uses System.SysUtils, System.Generics.Collections, System.Rtti; type TObjDic = TObjectDictionary<string, string>; TMClass = class private fMC: TObjDic; public constructor Create; destructor Destroy; override; property MC: TObjDic read fMC write fMC; end; constructor TMClass.Create; begin inherited; fMC:=TObjDic.create; end; destructor TMClass.Destroy; begin fMC.Free; inherited; end; var mc: TMClass; ctx: TRttiContext; rType: TRttiType; rProp: TRttiProperty; propValue: TValue; genDict: TObjectDictionary<string, TValue>; begin mc:=TMClass.Create; rType := ctx.GetType(mc.ClassInfo); rProp:=rType.GetProperty('MC'); // In this code, this may seem redundant but I use this code is part of // bigger codebase propValue:=rProp.GetValue(mc); genDict:=nil; genDict:=propvalue.AsObject as TObjectDictionary<string, TValue>; if Assigned(genDict) then begin for var str in genDict.Keys do begin // For demo var f:=str; end; genDict.Free; end; mc.Free; end.
  6. John Kouraklis

    How to iterate a TDictionary using RTTI and TValue

    I found out that TKey in my code is declared (for unexplained reasons) in Data.DBXCommon with is irrelevant. Maybe that is the cause of the AVs I get. But now I don't seem to be able to declare TKey as data type although I include System.Generics.Collections. How do I declare it in a unit? It is originally declared using $HPPEMIT (Generics.Collections, line 750)
  7. John Kouraklis

    How to iterate a TDictionary using RTTI and TValue

    Hi Remy, I tried that (.AsType....) before as well; I run to the same problem of using TKey which is an abstract class although I can see in the debugger that the object points to the content of the dictionary.]
  8. Hi, I've got a class and it has a property TDictionary<..,..>. I want to use RTTI to access the key and value of the dictionary. I am able to get the property but I can't figure out how to access the key and values. I use this approach: var genericDictionary: TDictionary<TKey, TValue>; propValue: TValue; ... propvalue.ExtractRawDataNoCopy(@genericDictionary); ---> Here I can see in the debugger that genericDictionary has the items and the correct count Then, I get AV when I try to iterate the Keys because TKey is an abstract class. Anyone can help? Thanks
  9. John Kouraklis

    Client Library for FusionAuth?

    Hi, I am going to use FusionAuth for authentication. Quick Question: before I write my own client, does anyone have a library and happy to share? Thanks
  10. John Kouraklis

    Just wanted to brag a bit :-)

    Amazing! Do you use any libraries on FMX for the GUI? Looks very responsive
  11. John Kouraklis

    LiveBindings and evaluating logical expressions

    @ErikB Hi Erik, just saw your reply. I will have a look at the link; thanks. Yes; I remember. It was a pleasure meeting you. Regards John
  12. John Kouraklis

    Advertising supported delphi desktop application

    I researched a lot this because I wanted to include ads in my desktop app as well. The bottom line is that all the content publishers support only mobile apps. I have seen the link you give before but I am unclear as to whether it works. I doubt TBH. Google ads does not allow desktop apps indeed and they ban your account even if you "fake" a website withing a browser component. I have a app on my desktop (TuneIn) that shows ads from google. In earlier versions, they were using Taboola but now they moved to Google Ads. When I was reaching out people from the ad networks, they all told me that the app is using a few google accounts and cycles them so detection is avoided. They also said that eventually google will figure it. If you download the app, you can click and drag and select all the components in the window; pretty much what you do in a web page. This makes me think that the app is written with some sort of web framework and is mocking a website and thus the ads show normally. One of those people I talked to said that in general revenue from ads in desktop apps is extremely low which in practice makes it a worthless choice unless you have 4-5 million downloads. He suggested to consider other forms of licensing, like freemium, etc.
  13. John Kouraklis

    Pimlico: Microservices in Delphi - Part 1

    Friends also give the option to friends to use or not Synchronize 🙂
  14. Hi all, diving into the world of microservices in Delphi. Here we go: www.kouraklis.com/2020/01/microservices-in-delphi-part-1/ Thanks
  15. John Kouraklis

    Can't assign app icon

    Hi, I had icons assigned to one of my projects and now all of the sudden delphi doesn't use them. Instead, when the FMX app runs I see the generic icon from windows. When I go to App Options, my icons appear there. Then, I click on Default, the icons change in the Options dialog but again not used when I execute the app I get the generic icon again. I've checked the .dprog file and deleted the entries with icons and reassigned them in the IDE. Sadly I can't seem to be able to assign icons to the app.
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