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using System.IO;
using System;
using iTextSharp.tool.xml;
using iTextSharp.text;
using iTextSharp.tool.xml.pipeline;
using System.Collections.Generic;
using System.Text;
using iTextSharp.text.pdf;
using System.Net;

namespace Test
{
    //设置字体类  
    public class UnicodeFontFactory : FontFactoryImp
    {
        private static readonly string arialFontPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Fonts),
  "arialuni.ttf");//arial unicode MS是完整的unicode字型。  
        private static readonly string 标楷体Path = Path.Combine(System.Web.HttpContext.Current.Server.MapPath("~/Content/font/"),
        "楷体_GB2312.ttf");//标楷体  
        private static readonly string 黑体Path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Fonts),
        "simhei.ttf");//标楷体  


        public override Font GetFont(string fontname, string encoding, bool embedded, float size, int style, BaseColor color, bool cached)
        {
            BaseFont bfChiness = BaseFont.CreateFont(@"C:\Windows\Fonts\SIMSUN.TTC,1", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
            //可用Arial或标楷体，自己选一个  
            BaseFont baseFont = BaseFont.CreateFont(黑体Path, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
            return new Font(baseFont, size, style, color);
        }
    }

    public class HtmlToPdfRenderer
    {
        /// <summary>  
        /// 将Html文字 输出到PDF档里  
        /// </summary>  
        /// <param name="htmlText"></param>  
        /// <returns></returns>  
        public byte[] ConvertHtmlTextToPDF(string htmlText)
        {
            if (string.IsNullOrEmpty(htmlText))
            {
                return null;
            }
            //避免当htmlText无任何html tag标签的纯文字时，转PDF时会挂掉，所以一律加上<p>标签  
            //htmlText = "<p>" + htmlText + "</p>";

            MemoryStream outputStream = new MemoryStream();//要把PDF写到哪个串流  
            byte[] data = Encoding.UTF8.GetBytes(htmlText);//字串转成byte[]  
            MemoryStream msInput = new MemoryStream(data);
            Document doc = new Document();//要写PDF的文件，建构子没填的话预设直式A4  
            PdfWriter writer = PdfWriter.GetInstance(doc, outputStream);
            //指定文件预设开档时的缩放为100%  

            PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, doc.PageSize.Height, 1f);
            //开启Document文件   
            doc.Open();

            //使用XMLWorkerHelper把Html parse到PDF档里  
             XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msInput, null, Encoding.UTF8, new UnicodeFontFactory());  
            //XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msInput, null, Encoding.UTF8);

            //将pdfDest设定的资料写到PDF档  
            PdfAction action = PdfAction.GotoLocalPage(1, pdfDest, writer);
            writer.SetOpenAction(action);

            doc.Close();
            msInput.Close();
            outputStream.Close();
            //回传PDF档案   
            return outputStream.ToArray();

        }

        /// <summary>  
        /// 判断是否有乱码  
        /// </summary>  
        /// <param name="txt"></param>  
        /// <returns></returns>  
        public bool IsMessyCode(string txt)
        {
            var bytes = Encoding.UTF8.GetBytes(txt);            //239 191 189              
            for (var i = 0; i < bytes.Length; i++)
            {
                if (i < bytes.Length - 3)
                    if (bytes[i] == 239 && bytes[i + 1] == 191 && bytes[i + 2] == 189)
                    {
                        return true;
                    }
            }
            return false;
        }

        /// <summary>  
        /// 获取网站内容，包含了 HTML+CSS+JS  
        /// </summary>  
        /// <returns>String返回网页信息</returns>  
        public string GetWebContent(string url)
        {
            try
            {
                WebClient MyWebClient = new WebClient();
                MyWebClient.Credentials = CredentialCache.DefaultCredentials;
                //获取或设置用于向Internet资源的请求进行身份验证的网络凭据  
                Byte[] pageData = MyWebClient.DownloadData(url);
                //从指定网站下载数据  
                string pageHtml = Encoding.UTF8.GetString(pageData);
                //如果获取网站页面采用的是GB2312，则使用这句         
                bool isBool = IsMessyCode(pageHtml);//判断使用哪种编码 读取网页信息  
                if (!isBool)
                {
                    string pageHtml1 = Encoding.UTF8.GetString(pageData);
                    pageHtml = pageHtml1;
                }
                else
                {
                    string pageHtml2 = Encoding.Default.GetString(pageData);
                    pageHtml = pageHtml2;
                }
                return pageHtml;
            }

            catch (WebException webEx)
            {
                Console.WriteLine(webEx.Message.ToString());
                return webEx.Message;
            }
        }  

    }

}