使用Aspose组件将WORD、PDF、PPT转为图片

参考资料：http://www.studyofnet.com/news/1268.html using System;   using System.Collections.Generic;   using System.Text;   using OMCS.Engine.WhiteBoard;   using ESBasic;   using System.Drawing.Imaging;   using System.IO;   using System.Drawing;   using Schematrix;      namespace OMCS.Demos.WhiteBoardTest   {       /**//*         *        * 将pdf、ppf、word转换给图片的组件有很多，这里仅使用Aspose组件（试用版）作为示例。       *        *        */          图片转换器工厂 -> 将被注入到OMCS的多媒体管理器IMultimediaManager的ImageConverterFactory属性#region 图片转换器工厂 -> 将被注入到OMCS的多媒体管理器IMultimediaManager的ImageConverterFactory属性       /**//// <summary>       /// 图片转换器工厂。       /// </summary>       public class ImageConverterFactory : IImageConverterFactory       {           public IImageConverter CreateImageConverter(string extendName)           {               if (extendName == ".doc" || extendName == ".docx")               {                   return new Word2ImageConverter();               }                  if (extendName == ".pdf")               {                   return new Pdf2ImageConverter();               }                  if (extendName == ".ppt" || extendName == ".pptx")               {                   return new Ppt2ImageConverter();               }                  if (extendName == ".rar")               {                   return new Rar2ImageConverter();                }                  return null;           }              public bool Support(string extendName)           {               return extendName == ".doc" || extendName == ".docx" || extendName == ".pdf" || extendName == ".ppt" || extendName == ".pptx" || extendName == ".rar";           }       }        #endregion          将word文档转换为图片#region 将word文档转换为图片       public class Word2ImageConverter : IImageConverter       {           private bool cancelled = false;           public event CbGeneric<int, int> ProgressChanged;           public event CbGeneric ConvertSucceed;           public event CbGeneric<string> ConvertFailed;              public void Cancel()           {               if (this.cancelled)               {                   return;               }                  this.cancelled = true;           }              public void ConvertToImage(string originFilePath, string imageOutputDirPath)           {               this.cancelled = false;               ConvertToImage(originFilePath, imageOutputDirPath, 0, 0, null, 200);           }              /**//// <summary>           /// 将Word文档转换为图片的方法                 /// </summary>           /// <param name="wordInputPath">Word文件路径</param>           /// <param name="imageOutputDirPath">图片输出路径，如果为空，默认值为Word所在路径</param>                 /// <param name="startPageNum">从PDF文档的第几页开始转换，如果为0，默认值为1</param>           /// <param name="endPageNum">从PDF文档的第几页开始停止转换，如果为0，默认值为Word总页数</param>           /// <param name="imageFormat">设置所需图片格式，如果为null，默认格式为PNG</param>           /// <param name="resolution">设置图片的像素，数字越大越清晰，如果为0，默认值为128，建议最大值不要超过1024</param>           private void ConvertToImage(string wordInputPath, string imageOutputDirPath, int startPageNum, int endPageNum, ImageFormat imageFormat, int resolution)           {               try               {                   Aspose.Words.Document doc = new Aspose.Words.Document(wordInputPath);                      if (doc == null)                   {                       throw new Exception("Word文件无效或者Word文件被加密！");                   }                      if (imageOutputDirPath.Trim().Length == 0)                   {                       imageOutputDirPath = Path.GetDirectoryName(wordInputPath);                   }                      if (!Directory.Exists(imageOutputDirPath))                   {                       Directory.CreateDirectory(imageOutputDirPath);                   }                                     if (startPageNum <= 0)                   {                       startPageNum = 1;                   }                      if (endPageNum > doc.PageCount || endPageNum <= 0)                   {                       endPageNum = doc.PageCount;                   }                      if (startPageNum > endPageNum)                   {                       int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum;                   }                      if (imageFormat == null)                   {                       imageFormat = ImageFormat.Png;                   }                      if (resolution <= 0)                   {                       resolution = 128;                   }                      string imageName = Path.GetFileNameWithoutExtension(wordInputPath);                   Aspose.Words.Saving.ImageSaveOptions imageSaveOptions = new Aspose.Words.Saving.ImageSaveOptions(Aspose.Words.SaveFormat.Png);                   imageSaveOptions.Resolution = resolution;                   for (int i = startPageNum; i <= endPageNum; i++)                   {                       if (this.cancelled)                       {                           break;                       }                          MemoryStream stream = new MemoryStream();                       imageSaveOptions.PageIndex = i - 1;                       string imgPath = Path.Combine(imageOutputDirPath, imageName) + "_" + i.ToString("000") + "." + imageFormat.ToString();                       doc.Save(stream, imageSaveOptions);                       Image img = Image.FromStream(stream);                       Bitmap bm = ESBasic.Helpers.ImageHelper.Zoom(img, 0.6f);                       bm.Save(imgPath, imageFormat);                       img.Dispose();                       stream.Dispose();                       bm.Dispose();                          System.Threading.Thread.Sleep(200);                       if (this.ProgressChanged != null)                       {                           this.ProgressChanged(i - 1, endPageNum);                       }                   }                      if (this.cancelled)                   {                       return;                   }                      if (this.ConvertSucceed != null)                   {                       this.ConvertSucceed();                   }               }               catch (Exception ex)               {                   if (this.ConvertFailed != null)                   {                       this.ConvertFailed(ex.Message);                   }               }           }       }        #endregion          将pdf文档转换为图片#region 将pdf文档转换为图片       public class Pdf2ImageConverter : IImageConverter       {           private bool cancelled = false;           public event CbGeneric<int, int> ProgressChanged;           public event CbGeneric ConvertSucceed;           public event CbGeneric<string> ConvertFailed;              public void Cancel()           {               if (this.cancelled)               {                   return;               }                  this.cancelled = true;           }              public void ConvertToImage(string originFilePath, string imageOutputDirPath)           {               this.cancelled = false;               ConvertToImage(originFilePath, imageOutputDirPath, 0, 0, 200);           }              /**//// <summary>           /// 将pdf文档转换为图片的方法                 /// </summary>           /// <param name="originFilePath">pdf文件路径</param>           /// <param name="imageOutputDirPath">图片输出路径，如果为空，默认值为pdf所在路径</param>                  /// <param name="startPageNum">从PDF文档的第几页开始转换，如果为0，默认值为1</param>           /// <param name="endPageNum">从PDF文档的第几页开始停止转换，如果为0，默认值为pdf总页数</param>                  /// <param name="resolution">设置图片的像素，数字越大越清晰，如果为0，默认值为128，建议最大值不要超过1024</param>           private void ConvertToImage(string originFilePath, string imageOutputDirPath, int startPageNum, int endPageNum, int resolution)           {               try               {                   Aspose.Pdf.Document doc = new Aspose.Pdf.Document(originFilePath);                      if (doc == null)                   {                       throw new Exception("pdf文件无效或者pdf文件被加密！");                   }                      if (imageOutputDirPath.Trim().Length == 0)                   {                       imageOutputDirPath = Path.GetDirectoryName(originFilePath);                   }                      if (!Directory.Exists(imageOutputDirPath))                   {                       Directory.CreateDirectory(imageOutputDirPath);                   }                      if (startPageNum <= 0)                   {                       startPageNum = 1;                   }                      if (endPageNum > doc.Pages.Count || endPageNum <= 0)                   {                       endPageNum = doc.Pages.Count;                   }                      if (startPageNum > endPageNum)                   {                       int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum;                   }                      if (resolution <= 0)                   {                       resolution = 128;                   }                      string imageNamePrefix = Path.GetFileNameWithoutExtension(originFilePath);                   for (int i = startPageNum; i <= endPageNum; i++)                   {                       if (this.cancelled)                       {                           break;                       }                          MemoryStream stream = new MemoryStream();                                          string imgPath = Path.Combine(imageOutputDirPath, imageNamePrefix) + "_" + i.ToString("000") + ".jpg";                       Aspose.Pdf.Devices.Resolution reso = new Aspose.Pdf.Devices.Resolution(resolution);                       Aspose.Pdf.Devices.JpegDevice jpegDevice = new Aspose.Pdf.Devices.JpegDevice(reso, 100);                       jpegDevice.Process(doc.Pages[i], stream);                          Image img = Image.FromStream(stream);                       Bitmap bm = ESBasic.Helpers.ImageHelper.Zoom(img, 0.6f);                       bm.Save(imgPath, ImageFormat.Jpeg);                       img.Dispose();                       stream.Dispose();                       bm.Dispose();                          System.Threading.Thread.Sleep(200);                       if (this.ProgressChanged != null)                       {                           this.ProgressChanged(i - 1, endPageNum);                       }                   }                      if (this.cancelled)                   {                       return;                   }                      if (this.ConvertSucceed != null)                   {                       this.ConvertSucceed();                   }               }               catch (Exception ex)               {                   if (this.ConvertFailed != null)                   {                       this.ConvertFailed(ex.Message);                   }               }           }       }        #endregion          将ppt文档转换为图片#region 将ppt文档转换为图片       public class Ppt2ImageConverter : IImageConverter       {           private Pdf2ImageConverter pdf2ImageConverter;                public event CbGeneric<int, int> ProgressChanged;           public event CbGeneric ConvertSucceed;           public event CbGeneric<string> ConvertFailed;              public void Cancel()           {               if (this.pdf2ImageConverter != null)               {                   this.pdf2ImageConverter.Cancel();               }           }              public void ConvertToImage(string originFilePath, string imageOutputDirPath)           {               ConvertToImage(originFilePath, imageOutputDirPath, 0, 0, 200);           }              /**//// <summary>           /// 将pdf文档转换为图片的方法                 /// </summary>           /// <param name="originFilePath">ppt文件路径</param>           /// <param name="imageOutputDirPath">图片输出路径，如果为空，默认值为pdf所在路径</param>                  /// <param name="startPageNum">从PDF文档的第几页开始转换，如果为0，默认值为1</param>           /// <param name="endPageNum">从PDF文档的第几页开始停止转换，如果为0，默认值为pdf总页数</param>                  /// <param name="resolution">设置图片的像素，数字越大越清晰，如果为0，默认值为128，建议最大值不要超过1024</param>           private void ConvertToImage(string originFilePath, string imageOutputDirPath, int startPageNum, int endPageNum, int resolution)           {               try               {                   Aspose.Slides.Presentation doc = new Aspose.Slides.Presentation(originFilePath);                      if (doc == null)                   {                       throw new Exception("ppt文件无效或者ppt文件被加密！");                   }                      if (imageOutputDirPath.Trim().Length == 0)                   {                       imageOutputDirPath = Path.GetDirectoryName(originFilePath);                   }                      if (!Directory.Exists(imageOutputDirPath))                   {                       Directory.CreateDirectory(imageOutputDirPath);                   }                      if (startPageNum <= 0)                   {                       startPageNum = 1;                   }                      if (endPageNum > doc.Slides.Count || endPageNum <= 0)                   {                       endPageNum = doc.Slides.Count;                   }                      if (startPageNum > endPageNum)                   {                       int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum;                   }                      if (resolution <= 0)                   {                       resolution = 128;                   }                      //先将ppt转换为pdf临时文件                   string tmpPdfPath = originFilePath + ".pdf";                   doc.Save(tmpPdfPath ,Aspose.Slides.Export.SaveFormat.Pdf);                      //再将pdf转换为图片                   Pdf2ImageConverter converter = new Pdf2ImageConverter();                   converter.ConvertFailed += new CbGeneric<string>(converter_ConvertFailed);                   converter.ConvertSucceed += new CbGeneric(converter_ConvertSucceed);                   converter.ProgressChanged += new CbGeneric<int, int>(converter_ProgressChanged);                   converter.ConvertToImage(tmpPdfPath, imageOutputDirPath);                      //删除pdf临时文件                   File.Delete(tmpPdfPath);                      if (this.ConvertSucceed != null)                   {                       this.ConvertSucceed();                   }               }               catch (Exception ex)               {                   if (this.ConvertFailed != null)                   {                       this.ConvertFailed(ex.Message);                   }               }                  this.pdf2ImageConverter = null;           }              void converter_ProgressChanged(int done, int total)           {               if (this.ProgressChanged != null)               {                   this.ProgressChanged(done, total);               }           }              void converter_ConvertSucceed()           {               if (this.ConvertSucceed != null)               {                   this.ConvertSucceed();               }           }              void converter_ConvertFailed(string msg)           {               if (this.ConvertFailed != null)               {                   this.ConvertFailed(msg);               }           }       }       #endregion          将图片压缩包解压。（如果课件本身就是多张图片，那么可以将它们压缩成一个rar，作为一个课件）#region 将图片压缩包解压。（如果课件本身就是多张图片，那么可以将它们压缩成一个rar，作为一个课件）       /**//// <summary>       /// 将图片压缩包解压。（如果课件本身就是多张图片，那么可以将它们压缩成一个rar，作为一个课件）       /// </summary>       public class Rar2ImageConverter : IImageConverter       {           private bool cancelled = false;           public event CbGeneric<string> ConvertFailed;           public event CbGeneric<int, int> ProgressChanged;           public event CbGeneric ConvertSucceed;              public void Cancel()           {               this.cancelled = true;           }                 public void ConvertToImage(string rarPath, string imageOutputDirPath)           {               try               {                   Unrar tmp = new Unrar(rarPath);                   tmp.Open(Unrar.OpenMode.List);                   string[] files = tmp.ListFiles();                   tmp.Close();                      int total = files.Length;                   int done = 0;                      Unrar unrar = new Unrar(rarPath);                   unrar.Open(Unrar.OpenMode.Extract);                   unrar.DestinationPath = imageOutputDirPath;                      while (unrar.ReadHeader() && !cancelled)                   {                       if (unrar.CurrentFile.IsDirectory)                       {                           unrar.Skip();                       }                       else                       {                           unrar.Extract();                           ++done;                              if (this.ProgressChanged != null)                           {                               this.ProgressChanged(done, total);                           }                       }                   }                   unrar.Close();                      if (this.ConvertSucceed != null)                   {                       this.ConvertSucceed();                   }                  }               catch (Exception ex)               {                   if (this.ConvertFailed != null)                   {                       this.ConvertFailed(ex.Message);                   }               }           }                     }        #endregion   }