How to generate QR Code on PDF file in flutter - flutter

Question

I have used this solution How Can I generate QR code and Show it on a PDF page in Flutter but still QR Code isn't being printed.
My code:
pdf.BarcodeWidget(
color: PdfColor.fromHex("#000000"),
barcode:pdf.Barcode.qrCode(), data: "My name is Bilal"
),
This is my function:
Future<Uint8List> func_generate_sale_pdf(PdfPageFormat format) {
final doc = pdf.Document();
doc.addPage(pdf.Page(build: (pdf.Context context) {
return pdf.Center(
child: pdf.Column(children: <pdf.Widget>[
pdf.Text(config.app_name.toUpperCase(),
style:
pdf.TextStyle(fontSize: 32, fontWeight: pdf.FontWeight.bold)),
pdf.SizedBox(height: 25),
pdf.Text(
" ${languages.skeleton_language_objects[config.app_language]['for_enquiries_call']} : ${config.app_contacts}",
style: pdf.TextStyle(fontSize: 22)),
pdf.SizedBox(height: 5),
pdf.Text("${config.app_po_box}", style: pdf.TextStyle(fontSize: 22)),
pdf.SizedBox(height: 5),
pdf.Text(
"${languages.skeleton_language_objects[config.app_language]['receipt']} # ${receipt_data['receipt_no']}",
style: pdf.TextStyle(fontSize: 20)),
pdf.SizedBox(height: 5),
pdf.Text("${receipt_data['date_time']}",
style: pdf.TextStyle(fontSize: 20)),
pdf.SizedBox(height: 30),
pdf.Container(
alignment: pdf.Alignment.topLeft,
child: pdf.Text("${receipt_data['items_list'].toString()}",
style: pdf.TextStyle(
fontSize: 22, fontWeight: pdf.FontWeight.normal),
textAlign: pdf.TextAlign.left),
),
pdf.SizedBox(height: 30),
pdf.Container(
child: pdf.Row(children: <pdf.Widget>[
pdf.Expanded(
flex: 1,
child: pdf.Text(
languages.skeleton_language_objects[config.app_language]
['total_amount'],
style: pdf.TextStyle(
fontSize: 20, fontWeight: pdf.FontWeight.bold),
textAlign: pdf.TextAlign.left),
),
pdf.Expanded(
flex: 1,
child: pdf.Text("${receipt_data['total_amount']}",
style: pdf.TextStyle(fontSize: 20),
textAlign: pdf.TextAlign.right),
),
])),
pdf.SizedBox(height: 10),
pdf.Container(
child: pdf.Row(children: <pdf.Widget>[
pdf.Expanded(
flex: 1,
child: pdf.Text(
languages.skeleton_language_objects[config.app_language]
['total_items'],
style: pdf.TextStyle(
fontSize: 20, fontWeight: pdf.FontWeight.bold),
textAlign: pdf.TextAlign.left),
),
pdf.Expanded(
flex: 1,
child: pdf.Text("${receipt_data['total_items']}",
style: pdf.TextStyle(fontSize: 20),
textAlign: pdf.TextAlign.right),
),
])),
pdf.SizedBox(height: 10),
pdf.Container(
height: 35,
child: pdf.Row(children: <pdf.Widget>[
pdf.Expanded(
flex: 1,
child: pdf.Text(
languages.skeleton_language_objects[config.app_language]
['total_tax'],
style: pdf.TextStyle(
fontSize: 20, fontWeight: pdf.FontWeight.bold),
textAlign: pdf.TextAlign.left),
),
pdf.Expanded(
flex: 1,
child: pdf.Text("${receipt_data['total_tax_amount']}",
style: pdf.TextStyle(fontSize: 20),
textAlign: pdf.TextAlign.right),
),
])),
pdf.SizedBox(height: 35),
pdf.Text(
languages.skeleton_language_objects[config.app_language]
['thant_you_and_come_again'],
style: pdf.TextStyle(fontSize: 24)),
//From here on, the compiler doesn't print anything.
pdf.BarcodeWidget(
color: PdfColor.fromHex("#000000"),
barcode:pdf.Barcode.qrCode(), data: "My name is Bilal"
),
pdf.Text("SkillzUPP Technologies: [phone]",
style: pdf.TextStyle(fontSize: 24),
textAlign: pdf.TextAlign.center),
pdf.SizedBox(height: 10),
]),
); // Center
}));
return doc.save();
}
Everything prints fine except QR Code and at that specific line this error is shown at terminal:
Helvetica-Bold has no Unicode support see https://github.com/DavBfr/dart_pdf/wiki/Fonts-Management

Answer 1

I had a problem showing that line "has no Unicode support..." to fix that i created a folder fonts on my project and added some true type fonts to it, then i created a pdf theme for the document like below:
var myTheme = ThemeData.withFont(
base: Font.ttf(await rootBundle.load("fonts/OpenSans-Regular.ttf")),
bold: Font.ttf(await rootBundle.load("fonts/OpenSans-Bold.ttf")),
italic: Font.ttf(await rootBundle.load("fonts/OpenSans-Italic.ttf")),
boldItalic:
Font.ttf(await rootBundle.load("fonts/OpenSans-BoldItalic.ttf")),
);
then i used the theme in the page of the document and the error was gone, like below:
Page(theme: myTheme,...)
I'm not sure if is the same case, but i think you should try.