Unit scope names are prefixes that are prepended to unit names, this feature appeared in Delphi XE2 (VER230). Delpherium uses Unit scope names, for example, web3.eth.
That means Delphi version must be XE2 or higher.
Rudy Velthuis, one of the co-author, writes in comments section in the heads of units "Delphi version XE2 or later".
Well, but in unit web3.json.pas Stefan van As uses inline variable declarations, for instance,
var I := value.EstimatedByteSize;
such syntax appeared only in Delphi 10.3 Rio (VER330)!
Now I have a choice: either to update Delphi to a version higher than 10.2 Tokyo, or try to correct the sources using conditional compile directives, hiding variable declarations inside lines for versions 230-320 and assuming a role of co-author, needless to say if such activity does not require a serious alteration of the sources, which can lead to other errors.
I am newbie in Delphereum, but not newbie in programming, and I foresee the effect of editing someone's code when you are not good at a subject area.
First I will write to the author, Stefan van As, perhaps, his opinion will be useful or decisive.
unit web3.coincap;
In Delphi XE6 System.NetEncoding in Uses clause was not resolved.
In Delphi XE7 appeared.
Again
unit web3.coincap;
There was System.Types.IAsyncResult neither in Delphi XE6 nor in Delphi XE7.
Present in Delphi XE8, and is in Embarcadero Delphi 11 Alexandria for certain.
I decided to refuse from directive {$IFEND}, leaving the only {$ENDIF} and remove the conditional compilation directive {$LEGACYIFEND ON} at the beginning of the units. I only managed to spoil it with my edits in web3.json.
web3.json unit has copyright (c) 2018 of Stefan van As.
The directive {$ENDIF} was introduced in Delphi XE4, but versions earlier than Delphi X4 with {$IFEND} are out for Delpherium, because now I found out, that at least Delphi XE8 is to continue.
'THTTPClient' does not contain a member named 'BeginGet'...
'THTTPClient' does not contain a member named 'EndAsyncHttp'...
'THTTPClient' does not contain a member named 'StatusCode'...
In Delphi 10.2 Tokyo there appeared:
functions BeginGet, EndAsyncHTTP and property StatusCode
in THTTPClient, unit System.Net.HttpClientent.
But the Delphi 10.2 Tokyo compiler in gave out the next errors, unit web3.http:
E2250 There is no overloaded version of 'get' that can be called with these arguments
in function call
const response = get(URL, [TNetHeader.Create('Content-Type', 'application/json')], backoff);
Embarcadero Delphi 10.3 Rio brings inline variable declarations and now there is no need to insert compiler directives, where inline variable declarations were.
Units web3.http, web3.coincap, web3.json, web3.sync were replaced with original copies.
But the Delphi 10.3 failed to compile, reported two errors in unit web3.coincap:
[dcc32 Error] E2149 Class does not have a default property
in line:
Result := TAsset.Create(TJsonArray(FJsonValue)[Index]);
Class - TJSONArray.
and
[dcc32 Error] E2010 Incompatible types: 'IAsyncResult' and 'web3.IResult
in
function assets(const callback: TProc
Embarcadero Delphi 10.4 complied and launched the project Connecting Delphi to a local (in-memory) blockchain
Summing up!
Delphereum with the first example Connecting Delphi to a local (in-memory) blockchain was test in Embarcadero Delphi XE6, Delphi XE7, Delphi XE8, Delphi 10.2 Tokyo, Delphi 10.3 Rio, Delphi 10.4 Sydney, Delphi 11.3 Alexandria.
Delphereum can be compiled and run in Embarcadero Delphi 10.4 Sydney or Delphi 11.3 Alexandria environment.
I got an idea it is wrong for Delphereum to be without a logo and me proposed it.
P.S.
Thanks to my schoolkid son for giving me his old computer for testing.
