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The Delphi streaming system knows that it handles TComponent descendants only. That way it can create each instance calling <SomeComponentClass>Create(<Owner>). In contrast TJSONUnMarshal.ObjectInstance works on any class having a parameterless constructor. It cannot rely on TObject.Create for that as it is not virtual. So the mechanism behind both approaches is totally different. I just wanted to emphasize that.

Well, this is a private research-project about the EU Covid-certificates. I wanted to know how that stuff works and how the pieces are glued together. After a wild mixture of very interesting and also some nasty hours, I got it working. I also learned about new data formats that were previously unknown to me (hello "cbor"). Many different techniques come together here: decoding the data from Base45 (yes, forty-five) decompressing the result using the zlib-classes downloading external supplementary files using the http-components hopping from the formats "COSE" to "CBOR" to "JSON" using OpenSSL to extract and validate the digital signature against the official public keys All of this is now integrated in a small and fluffy Delphi program. This client reads the personal/medical data from the certificate displays the specific information for "vaccinated"-certificates "tested"-certificates "recovered"-certificates reads the digital signature from the certificate verifys that signature using the public keys from the official trust-list to detect fraud is clearly not an official application ready for production use anywhere Important: Some, but not all code ist from me. The unit "cbor.pas" comes from "https://github.com/mikerabat/DelphiCBOR", the interface to openssl comes from "https://github.com/Arvur/OpenSSL-Delphi". Just in case you're interested and want to try it: Download attached zip-archive. It contains the complete Delphi-project as well as the value-sets and trust-list (see #3). You need to get your hands on the openssl-libraries "libeay32.dll" and "ssleay32.dll" (not included in the downloads). These libraries must be located in the same directory as the executable. By default "Win32-Debug" is the output-path for this project. If you decide to switch to 64bit, you should provide the matching libraries. This program reads the trust-list and the so-called value-sets from external json-files. These files can be downloaded using the button "Download supplementary data" (button starts download, gives no feedback, you must restart the program afterwards). The trust-list contains the list of currently valid public-certificates. The value-sets contain the translations from IDs (values) to readable strings. All the json-files must be in the same directory as the executable - and that directory must be writable. The json-files from today are included in the download. You need - of course - an EU Covid-19 health certificate (vaccinated, tested or recovered). Take any barcode-scanner to translate the barcode into textual representation: You should get a string starting with "HC1:". Paste that code into the windows that opened after pressing "Scan certificate". CovDemo_06-Feb-2022.zip

Also mine is valid! Congratulations Daniel!

So it performed identically to running on Windows? I've got a cutting edge Linux desktop; tomorrow I'll give the trial of Rad Studio 11 a go with the latest version of WINE staging (a series of patches on top of WINE) and Valve's Proton fork of WINE if necessary and see if I can get working. I've got a reasonable amount of experience poking Windows software with a stick until it runs under Linux.

What exactly is not working? Please be more specific. Actually, I can't. I don't have to working IDE installed at the moment. Everything I wrote earlier was from memory only.

For the M-series ARM CPUs, Windows 11 for ARM is the only viable option. Parallells' seamless Windows on MacOS solution is mindblowing. I am working on integration solutions using IBM App Connect Enterprise these days, so I've not been able to spend so much time with Delphi on the Mac as I'd like to. Our company is moving away from Delphi, and the current app portfolio has gone into care & maintenance mode and will in time be replaced with commercial shelf-ware, so my active Delphi time will be greatly reduced going forward. As for using Delphi under Win4ARM om M1 - compilation is not a problem, but I have not had time to test debugging on iOS/Android at all, so others must peep up about any eventual issues on that. Other than the debuggers of Delphi being in an awful state in general - as long as the VM is set up to reroute the USB connections correctly, I would not expect any issues. I went for Pro + 32Gb + 2TB as I don't expect to need those gfx cores. I'd opt for a 64Gb Pro if there was one, but only Max supports 64Gb. I have to say it is an awesome piece of HW - although - during the winter, I actually miss the heat from the Intel CPU on the Lenovo 😛 I'd opt for even more storage, but Apple are greedy AF.