将RTF文件转换为HTML的方法(借助Office2003)

 

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Threading;
using System.Reflection;
using System.Runtime.InteropServices;
using Microsoft.Office.Interop.Word;

namespace Flyer.VST.QuestionTransform
...{
    public class Rtf2Html
    ...{
        public delegate void Delegate_FoundImage(ref string SrcString, string ImageFile);
        public event Delegate_FoundImage Event_FoundImage;

        public Rtf2Html()
        ...{
            WordApp = new ApplicationClass();
        }

        private ApplicationClass WordApp;

        private string m_TempFolder;
        public string TempFolder
        ...{
            get ...{ return m_TempFolder; }
            set ...{ m_TempFolder = value; }
        }

        public void BeginTransform()
        ...{
            if (!Directory.Exists(m_TempFolder))
            ...{
                Directory.CreateDirectory(m_TempFolder);
            }
        }

        public string Transform(string rtfstring)
        ...{
            Guid guid = Guid.NewGuid();
            string rtffilename = Path.Combine(m_TempFolder, guid.ToString() + ".rtf");
            File.WriteAllText(rtffilename, rtfstring);

            //------------------------------------------------------------------
            object fileName = rtffilename;
            object readOnly = true;
            object isVisible = false;
            object missing = Missing.Value;
            Document doc = WordApp.Documents.Open(ref fileName, ref missing, ref readOnly,
                ref missing, ref missing, ref missing, ref missing, ref missing, ref missing,
                ref missing, ref missing, ref isVisible, ref missing, ref missing, ref missing, ref missing);
            //------------------------------------------------------------------

            string htmlfilename = Path.Combine(m_TempFolder, guid.ToString() + ".htm");
            //----------------------------------------------------------------------
            fileName = htmlfilename;
            object Format = (int)WdSaveFormat.wdFormatHTML;
            doc.SaveAs(ref fileName, ref Format, ref missing, ref missing, ref missing, ref missing, ref missing,
                ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing);

            //----------------------------------------------------------------------
            doc.Close(ref missing, ref missing, ref missing);
            Marshal.ReleaseComObject(doc);
            doc = null;
            GC.Collect();

            return ProcessHtml(rtffilename, htmlfilename);
        }

        private string ProcessHtml(string rtffilename,string htmlfilename)
        ...{
            
            //------------------------------------------------------------------------------------------------------------
            string html = File.ReadAllText(htmlfilename, System.Text.Encoding.Default);

            html = html.Replace(" ", " ");
            html = html.Replace("<o:p></o:p>", "");
            html = html.Replace("<![if !vml]>", "");
            html = html.Replace("<![endif]>", "");
            html = html.Replace("</p>", "<br>");
            //------------------------------------------------------------------------------------------------------------
            int div_startindex, div_endindex;
            div_startindex = html.IndexOf("<div");
            div_startindex = html.IndexOf(">", div_startindex + 1);
            div_endindex = html.LastIndexOf("</div>");
            html = html.Substring(div_startindex + 1, div_endindex - div_startindex - 1);
            //------------------------------------------------------------------------------------------------------------
            int span_startindex, span_endindex;
            while (true)
            ...{
                span_startindex = html.IndexOf("<span");
                if (span_startindex == -1)
                    break;
                else
                    span_endindex = html.IndexOf("</span>", span_startindex + 1);

                if (span_endindex == -1)
                    break;

                int temp_startindex = html.IndexOf(">", span_startindex + 1);
                if (temp_startindex == -1)
                    break;

                html = html.Remove(span_endindex, 7);
                html = html.Remove(span_startindex, temp_startindex - span_startindex + 1);
            }
            //------------------------------------------------------------------------------------------------------------
            int vml_startindex, vml_endindex;
            while (true)
            ...{
                vml_startindex = html.IndexOf("<!--");
                if (vml_startindex == -1)
                    break;
                else
                    vml_endindex = html.IndexOf("-->", vml_startindex + 1);

                if (vml_endindex == -1)
                    break;

                html = html.Remove(vml_startindex, vml_endindex + 3 - vml_startindex);
            }
            //------------------------------------------------------------------------------------------------------------
            int p_startindex, p_endindex;
            while (true)
            ...{
                p_startindex = html.IndexOf("<p");
                if (p_startindex == -1)
                    break;
                else
                    p_endindex = html.IndexOf(">", p_startindex + 1);

                if (p_endindex == -1)
                    break;

                html = html.Remove(p_startindex, p_endindex - p_startindex + 1);
            }
            //------------------------------------------------------------------------------------------------------------
            int img_startindex = -1, img_endindex;
            while (true)
            ...{
                img_startindex = html.IndexOf("<img", img_startindex + 1);
                if (img_startindex == -1)
                    break;
                else
                    img_endindex = html.IndexOf(">", img_startindex + 1);

                if (img_endindex == -1)
                    break;

                string imgstring = html.Substring(img_startindex, img_endindex - img_startindex + 1);

                int src_startindex, src_endindex;
                src_startindex = imgstring.IndexOf("src");
                src_startindex = imgstring.IndexOf(""", src_startindex + 1);
                src_endindex = imgstring.IndexOf(""", src_startindex + 1);

                string srcstring = imgstring.Substring(src_startindex + 1, src_endindex - src_startindex - 1);

                DirectoryInfo dirinfo =  Directory.GetParent(htmlfilename);

                string image_path = Path.Combine(dirinfo.FullName,srcstring.Replace('/','/'));

                if (Event_FoundImage != null)
                ...{
                    Event_FoundImage(ref srcstring, image_path);
                }

                html = html.Replace(imgstring, string.Format("<img style="border-left-color:#000000;filter:;border-bottom-color:#000000;border-top-color:#000000;border-right-color:#000000" alt="" src="{0}" border="0">", srcstring));
            }
            //--------------------------------------------------------------------------------------
            
            File.Delete(rtffilename);
            File.Delete(htmlfilename);
            Directory.Delete(htmlfilename.Replace(".htm", ".files"), true);

            html = html.Trim();

            if(html.EndsWith("<br>"))
            ...{
                html = html.Substring(0, html.Length - 4);
            }

            return html;
        }

        public void EndTransform()
        ...{
            object missing = Missing.Value;
            WordApp.Application.Quit(ref missing, ref missing, ref missing);
            Marshal.ReleaseComObject(WordApp);
            WordApp = null;
            GC.Collect();
        }
    }
}