允许使用itext7在pdf表中使用阿拉伯语文本(xamarin android) [英] allow arabic text in pdf table using itext7 (xamarin android)

问题描述

我必须将列表数据放在pdf文件的表格中.我的数据有一些阿拉伯语单词.生成我的pdf时，没有出现阿拉伯语单词.我搜索后发现需要itext7.pdfcalligraph，因此将其安装在我的应用程序中.我也找到了此代码 https://itextpdf.com/zh-CN/blog/technical-notes/displaying-text-different-languages-single-pdf-document ，并尝试做类似的操作以允许阿拉伯语出现在我的表格中，但我无法弄清楚

I have to put my list data in a table in a pdf file. My data has some Arabic words. When my pdf is generated, the Arabic words don't appear. I searched and found that I need itext7.pdfcalligraph so I installed it in my app. I found this code too https://itextpdf.com/en/blog/technical-notes/displaying-text-different-languages-single-pdf-document and tried to do something similar to allow Arabic words in my table but I couldn't figure it out.

在我将其应用于真实列表之前，这是一个试用代码:

This is a trial code before I apply it to my real list:

var path2 = global::Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
filePath = System.IO.Path.Combine(path2.ToString(), "myfile2.pdf");
stream = new FileStream(filePath, FileMode.Create);
PdfWriter writer = new PdfWriter(stream);
PdfDocument pdf2 = new iText.Kernel.Pdf.PdfDocument(writer);
            
Document document = new Document(pdf2, PageSize.A4);
FontSet set = new FontSet();
set.AddFont("ARIAL.TTF");


document.SetFontProvider(new FontProvider(set));
document.SetProperty(Property.FONT, "Arial");
 
string[] sources = new string[] { "يوم","شهر 2020" };
 iText.Layout.Element.Table table = new iText.Layout.Element.Table(2, false);
 foreach (string source in sources)
                {
                    Paragraph paragraph = new Paragraph();
                    Bidi bidi = new Bidi(source, Bidi.DirectionDefaultLeftToRight);
                    if (bidi.BaseLevel != 0)
                    {
                        paragraph.SetTextAlignment(iText.Layout.Properties.TextAlignment.RIGHT);
                    }

                    paragraph.Add(source);
                    table.AddCell(new Cell(1, 1).SetTextAlignment(iText.Layout.Properties.TextAlignment.CENTER).Add(paragraph));
                }
                document.Add(table);
                document.Close();

我更新了代码，并将arial.ttf添加到资产文件夹中.我收到以下异常:

I updated my code and added the arial.ttf to my assets folder . i'm getting the following exception:

System.InvalidOperationException:'FontProvider和FontSet为空.如果未初始化FontProvider(请参阅RootElement#setFontProvider)，则无法解析字体系列名称(请参阅ElementPropertyContainer#setFontFamily). 而且我仍然无法弄清楚.有任何想法吗? 预先感谢

System.InvalidOperationException: 'FontProvider and FontSet are empty. Cannot resolve font family name (see ElementPropertyContainer#setFontFamily) without initialized FontProvider (see RootElement#setFontProvider).' and I still can't figure it out. any ideas? thanks in advance

推荐答案

-C#

对于土耳其语字符，我也有类似情况，并且我遵循了这些规则 步骤:

I have a similar situation for Turkish characters, and I've followed these steps :

• 在项目根文件夹下创建一个文件夹:/wwwroot/Fonts
• 在Fonts文件夹下添加OpenSans-Regular.ttf

字体路径为=> ../wwwroot/Fonts/OpenSans-Regular.ttf

Path for font is => ../wwwroot/Fonts/OpenSans-Regular.ttf

• 创建如下字体:

public static PdfFont CreateOpenSansRegularFont()
{
    var path = "{Your absolute path for FONT}";
    return PdfFontFactory.CreateFont(path, PdfEncodings.IDENTITY_H, true);
}

并像这样使用它:

paragraph.Add(source)
         .SetFont(FontFactory.CreateOpenSansRegularFont());  //set font in here

table.AddCell(new Cell(1, 1)
     .SetTextAlignment(iText.Layout.Properties.TextAlignment.CENTER)
     .Add(paragraph));

这就是我将字体工厂用于土耳其字符的方式，例如:ü，i，ç，ş，ö"

This is how I used font factory for Turkish characters ex: "ü,i,ç,ş,ö"

对于Xamarin-Android，您可以尝试

For Xamarin-Android, you could try

string documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments); 
var path = Path.Combine(documentsPath, "Fonts/Arial.ttf");

这篇关于允许使用itext7在pdf表中使用阿拉伯语文本(xamarin android)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！