android - 我正在尝试使用 "Pdf creation library"在 flutter 应用程序中生成 pdf。在用其他语言生成 pdf 时会出现异常

Question

这是用于以其他语言字体生成 pdf 的代码:

final Uint8List fontData = File('fonts/shivaji05.ttf').readAsBytesSync();
final ttf = Font.ttf(fontData.buffer.asByteData());

这就是我在文本中使用定义字体的方式:

Text('साई बाबा', textScaleFactor: 2, style: new TextStyle(font: ttf)),

错误日志

E/flutter (26251): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: 'package:pdf/src/font.dart': Failed assertion: line 145 pos 14: 'false': 
E/flutter (26251): ---------------------------------------------
E/flutter (26251): Can not decode the string to Latin1.
E/flutter (26251): This font does not support Unicode characters.
E/flutter (26251): If you want to use strings other than Latin strings, use a TrueType (TTF) font instead.</i>

Answer 1

当我尝试使用“Pdf 创建库”在 Flutter 应用程序中生成 pdf 时，我遇到了类似的错误。在生成pdf时，我的源文本中有正确的单引号“'”“’”。

错误代码

final String soutceString = 'My source text with " ’ "';

final Document pdf = Document(deflate: zlib.encode);

pdf.addPage(
    MultiPage(
       build: (Context context) => <Widget>[
            Paragraph(text: soutceString),
       ]
    )
);

错误日志

flutter: 'package:pdf/src/font.dart': Failed assertion: line 145 pos 14: 'false':
---------------------------------------------
Can not decode the string to Latin1.
This font does not support Unicode characters.
If you want to use strings other than Latin strings, use a TrueType (TTF) font instead. 

当我发现错误的符号时，我只是替换它。

快速修复代码

final String sourceString = 'My source text with " ’ "';

final Document pdf = Document(deflate: zlib.encode);

sourceString.replaceAll('’', '`'),

pdf.addPage(MultiPage(
   build: (Context context) => <Widget>[
            Paragraph(text: sourceString)
        ]
    )
);

但我很害怕， future 会出现新的错误符号。我 将 arial.ttf 字体添加到 Assets (arial.ttf 包含我的符号)并使用它。 Adding assets

对我来说最好的案例

import 'package:flutter/services.dart' show rootBundle;



final String sourceString = 'My source text with " ’ "';

final Document pdf = Document(deflate: zlib.encode);

pdf.addPage(MultiPage(
     theme: Theme.withFont(
        base: Font.ttf(await rootBundle.load("assets/arial.ttf")),
        bold: Font.ttf(await rootBundle.load("assets/arial.ttf")),
        italic: Font.ttf(await rootBundle.load("assets/arial.ttf")),
        boldItalic: Font.ttf(await rootBundle.load("assets/arial.ttf")),
      ),
   build: (Context context) => <Widget>[
            Paragraph(text: sourceString)
          ]
    )
);