如何在我的网站中使用 PDFsharp 中的字体？

Question

我只是在 Azure WebApplication 网站上使用 Arial 字体，但是当我到达这一行时：

MainFont = new XFont("Arial", FontSize);

它抛出异常读取：Font data could not retrieved.

我原以为 Arial 会安装在服务器上...我还尝试将其更改为 Sans-Serif 以匹配 Microsoft 生成的网站的默认字体...但它仍然失败。

我也尝试将 Arial.ttf 添加到项目中，但没有奏效。

Answer 1

感谢@PDFSharp 团队的指点。这是我对 PdfSharp 1.5 beta3b 的实现：

将您想要的字体添加到您的项目中 - 在下面的示例中，我将 Arial 放入 MyProject\fonts\arial\arial.ttf 等。将每个字体文件设置为嵌入式资源（属性 -> 构建操作）。

使用这样的静态调用只应用一次字体解析器：

MyFontResolver.Apply(); // Ensures it's only applied once

这是字体解析器类：

class MyFontResolver : IFontResolver
{
    public FontResolverInfo ResolveTypeface(string familyName, bool isBold, bool isItalic)
    {
        // Ignore case of font names.
        var name = familyName.ToLower().TrimEnd('#');

        // Deal with the fonts we know.
        switch (name)
        {
            case "arial":
                if (isBold)
                {
                    if (isItalic)
                        return new FontResolverInfo("Arial#bi");
                    return new FontResolverInfo("Arial#b");
                }
                if (isItalic)
                    return new FontResolverInfo("Arial#i");
                return new FontResolverInfo("Arial#");
        }

        // We pass all other font requests to the default handler.
        // When running on a web server without sufficient permission, you can return a default font at this stage.
        return PlatformFontResolver.ResolveTypeface(familyName, isBold, isItalic);
    }

    /// <summary>
    /// Return the font data for the fonts.
    /// </summary>
    public byte[] GetFont(string faceName)
    {
        switch (faceName)
        {
            case "Arial#":
                return FontHelper.Arial;

            case "Arial#b":
                return FontHelper.ArialBold;

            case "Arial#i":
                return FontHelper.ArialItalic;

            case "Arial#bi":
                return FontHelper.ArialBoldItalic;
        }

        return null;
    }


    internal static MyFontResolver OurGlobalFontResolver = null;

    /// <summary>
    /// Ensure the font resolver is only applied once (or an exception is thrown)
    /// </summary>
    internal static void Apply()
    {
        if (OurGlobalFontResolver == null || GlobalFontSettings.FontResolver == null)
        {
            if (OurGlobalFontResolver == null)
                OurGlobalFontResolver = new MyFontResolver();

            GlobalFontSettings.FontResolver = OurGlobalFontResolver;
        }
    }
}


/// <summary>
/// Helper class that reads font data from embedded resources.
/// </summary>
public static class FontHelper
{
    public static byte[] Arial
    {
        get { return LoadFontData("MyProject.fonts.arial.arial.ttf"); }
    }

    public static byte[] ArialBold
    {
        get { return LoadFontData("MyProject.fonts.arial.arialbd.ttf"); }
    }

    public static byte[] ArialItalic
    {
        get { return LoadFontData("MyProject.fonts.arial.ariali.ttf"); }
    }

    public static byte[] ArialBoldItalic
    {
        get { return LoadFontData("MyProject.fonts.arial.arialbi.ttf"); }
    }

    /// <summary>
    /// Returns the specified font from an embedded resource.
    /// </summary>
    static byte[] LoadFontData(string name)
    {
        var assembly = Assembly.GetExecutingAssembly();

        // Test code to find the names of embedded fonts
        //var ourResources = assembly.GetManifestResourceNames();

        using (Stream stream = assembly.GetManifestResourceStream(name))
        {
            if (stream == null)
                throw new ArgumentException("No resource with name " + name);

            int count = (int)stream.Length;
            byte[] data = new byte[count];
            stream.Read(data, 0, count);
            return data;
        }
    }
}

这是一个基于这两个几乎相同的帖子的单一、完整和工人阶级：this blog 和this forum。

Answer 2

使用最新版本的 PDFsharp（当前为 1.50 beta 3）并实施 IFontResolver。

另请参阅：
https://stackoverflow.com/a/32489271/162529
https://stackoverflow.com/a/29059207/162529

该字体可能已安装在服务器上，但 PDFsharp 无法读取它。