如何在IronPython中重写C#方法

Question

我想在ironPython中实现iTextSharp的FontProvider，参考了这篇帖子 iText + HTMLWorker - 如何更改默认字体？。

我的代码总是报错：TypeError: GetFont()需要8个参数，但我只给了7个。

$ ipy itexthtml.py
[INFO] __init__ .. AngsanaUPC
Traceback (most recent call last):
  File "itexthtml.py", line 74, in <module>
  File "itexthtml.py", line 65, in main
TypeError: GetFont() takes exactly 8 arguments (7 given)

我不知道哪里出错了，有人能帮忙吗？

这是我的python代码。

import clr

clr.AddReference("itextsharp")

from iTextSharp.text import Document, PageSize, FontFactoryImp
from iTextSharp.text.pdf import PdfWriter
from iTextSharp.text.html.simpleparser import HTMLWorker,StyleSheet
from System.Collections.Generic import List, Dictionary
from System.IO import FileStream, MemoryStream, FileMode, SeekOrigin, StreamReader
from System.Text import UTF8Encoding
from System import String, Object

class DefaultFontProvider (FontFactoryImp) :

    def __init__(self, string_def) :

        print "[INFO] __init__ ..", string_def
        self.default = string_def

    def GetFont(self, fontname,  encoding,  embedded,  size,  style,  color,  cached) :
        print "[INFO] getFont ..", fontname

        if (fontname == None) :
            fontname = self.default

        print "[INFO] return .."
        return super(DefaultFontProvider, self).GetFont(fontname, encoding, embedded, size, style, color, cached)


def main() :

    output_pdf_file = "test.pdf"
    f = open("test.html", "r")
    html_data = f.readlines()
    html_data = "".join(html_data)

    document =  Document(PageSize.A4);
    PdfWriter.GetInstance(document, FileStream(output_pdf_file, FileMode.Create))
    document.Open()

    providers = Dictionary[String,Object]()
    providers.Add(HTMLWorker.FONT_PROVIDER, DefaultFontProvider("AngsanaUPC"));

    h = HTMLWorker(document)

    h.SetInterfaceProps(providers)

    file_list = List[String]()

    styles = StyleSheet();
    #styles.LoadTagStyle("body", "font-family", "AngsanaUPC");
    #styles.LoadTagStyle("body", "font-face", "AngsanaUPC");

    for idx in range(1) :

        document.NewPage()

        mem = MemoryStream()
        b = UTF8Encoding.UTF8.GetBytes(html_data)
        mem.Write(b, 0, b.Length)
        mem.Seek(0, SeekOrigin.Begin)

        sr = StreamReader(mem, UTF8Encoding.UTF8, styles)
        h.Parse(sr)

        sr.Dispose()
        mem.Dispose()

    document.Close()


if __name__ == "__main__" :
    main()

还有iTextSharp的FontFactoryImp类的定义。

public class FontFactoryImp : IFontProvider
{
    // Fields
    private bool defaultEmbedding;
    private string defaultEncoding;
    private Dictionary<string, List<string>> fontFamilies;
    private static readonly ILogger LOGGER;
    private Dictionary<string, string> trueTypeFonts;
    private static string[] TTFamilyOrder;

    // Methods
    static FontFactoryImp();
    public FontFactoryImp();
    public virtual Font GetFont(string fontname);
    public virtual Font GetFont(string fontname, float size);
    public virtual Font GetFont(string fontname, string encoding);
    public virtual Font GetFont(string fontname, float size, BaseColor color);
    public virtual Font GetFont(string fontname, float size, int style);
    public virtual Font GetFont(string fontname, string encoding, bool embedded);
    public virtual Font GetFont(string fontname, string encoding, float size);
    public virtual Font GetFont(string fontname, float size, int style, BaseColor color);
    public virtual Font GetFont(string fontname, string encoding, bool embedded, float size);
    public virtual Font GetFont(string fontname, string encoding, float size, int style);
    public Font GetFont(string fontname, string encoding, bool embedded, float size, int style);
    public virtual Font GetFont(string fontname, string encoding, float size, int style, BaseColor color);
    public virtual Font GetFont(string fontname, string encoding, bool embedded, float size, int style, BaseColor color);
    public virtual Font GetFont(string fontname, string encoding, bool embedded, float size, int style, BaseColor color, bool cached);
    public virtual bool IsRegistered(string fontname);
    public virtual void Register(string path);
    public virtual void Register(string path, string alias);
    public virtual int RegisterDirectories();
    public virtual int RegisterDirectory(string dir);
    public int RegisterDirectory(string dir, bool scanSubdirectories);
    public void RegisterFamily(string familyName, string fullName, string path);

    // Properties
    public virtual bool DefaultEmbedding { get; set; }
    public virtual string DefaultEncoding { get; set; }
    public virtual ICollection<string> RegisteredFamilies { get; }
    public virtual ICollection<string> RegisteredFonts { get; }
}

编程错误 ironpython typeerror 字体处理 c#方法重写 itextsharp fontprovider fontfactoryimp

如何在IronPython中重写C#方法

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