using System;

using System.Collections.Generic;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using iTextSharp.text;

using iTextSharp.text.pdf;

using System.IO;

using iTextSharp.tool.xml;

using System.Text;

using System.Net;

namespace PDFTools

{

    public partial class CreatePdf : System.Web.UI.Page

    {

        string INPATH = System.Web.HttpContext.Current.Server.MapPath("~/bin/temp.html");

        protected void Page_Load(object sender, EventArgs e)

        {

            string path = System.Web.HttpContext.Current.Server.MapPath("~/UploadPdf");

            if (!Directory.Exists(path))

                Directory.CreateDirectory(path);

            WebClient wc = new WebClient();

            //从网址下载Html字串

            wc.Encoding = System.Text.Encoding.UTF8;

            string htmlText = getWebContent();

            byte[] pdfFile = this.ConvertHtmlTextToPDF(htmlText);

            string fileId = "/file_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf";

            System.IO.File.WriteAllBytes(path + fileId, pdfFile);

        }

        /// <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 = ; i < bytes.Length; i++)

            {

                if (i < bytes.Length - )

                    if (bytes[i] ==  && bytes[i + ] ==  && bytes[i + ] == )

                    {

                        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()

        {

            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(INPATH);

                //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;

            }

        }

        /// <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, , 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(, pdfDest, writer);

            writer.SetOpenAction(action);

            doc.Close();

            msInput.Close();

            outputStream.Close();

            //回传PDF档案

            return outputStream.ToArray();

        }

        //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(Environment.GetFolderPath(Environment.SpecialFolder.Fonts),

            "KAIU.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(标楷体Path, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

                return new Font(bfChiness, size, style, color);

            }

        }

    }

}