vCard to QRCoder - diacritics problem

[VladdyH]

Hi, successfully implemented generating QR code that provides users with vCard information, but only when there are no diacritics.

I implemented QRCoder nuget v. 1.4.3 within my .NET Framework 4.8 web application that is set to use utf-8 by proper meta tag: <meta charset="utf-8" />
in the pages.

The case:
When I try to use czech characters - e.g.:
BEGIN:VCARD
VERSION:3.0
N:Novák;Janěščřžýáíé;
FN:Mgr. & Mgr. Janěščřžýáíé Novák, DiS.
ORG:MyCompany
TITLE:Mgr. & Mgr.
TEL;TYPE=,VOICE:+420123456789
ADR;TYPE=:;;
EMAIL:testovaci@adresa.tst
END:VCARD
Then the information read by QR scanner does not show the ěščř... characters correctly - only shows ??? and another garbage.

But when I add "úů" characters to the N... line:
BEGIN:VCARD
VERSION:3.0
N:Novák;Janěščřžýáíéúů;
FN:Mgr. & Mgr. Janěščřžýáíéúů Novák, DiS.
ORG:MyCompany
TITLE:Mgr. & Mgr.
TEL;TYPE=,VOICE:+420123456789
ADR;TYPE=:;;
EMAIL:testovaci@adresa.tst
END:VCARD
Then the information read by QR scanner shows every character correctly.

Any elaboration about using another version of vCard (e.g. 2.1) + specifying "N;CHARSET=UTF-8:Novák;Janěščřžýáíéúů;" did not give any effort.

My implementation for the code generation is pretty straightforward and works, except the case described above:

    public byte[] GetQRCode(string vstup, Color barvaKostek)
    {
        using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
        {
            using (QRCodeData qrCodeData = qrGenerator.CreateQrCode(vstup, QRCodeGenerator.ECCLevel.L)) 
                //ECCLevel = ErrorCorrectionLevel - odolnost proti chybám čtení (L=7%, M=15%, Q=25%, H=30%
            {
                using (QRCode qrCode = new QRCode(qrCodeData))
                {
                    Bitmap qrCodeImage = qrCode.GetGraphic(2, barvaKostek, Color.White, true); 
                    // číselný parametr pro GetGraphic = počet pixelů, které obsadí 1 zobrazený černý bod v grafickém výstupu

                    using (var ms = new MemoryStream())
                    {
                        qrCodeImage.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                        return ms.GetBuffer();
                    }
                }
            }
        }
    }

Am I missing anything that I should set for the QRCoder to work properly even without the "úů" characters?
Any leads could help. Thank you :)

[VladdyH]

Finally seems to have solution.
When I put diacritics to ORG: value, then all my QR readers can read diacritics correctly.
I am about to place an issue on this, suspecting bug presence...

[codebude]

As explained in

• vCard to QRCoder - diacritics problem #554

this is not a bug in QRCoder but in the reader software used to decode the QR code.