csharp: using Acrobat.dll pdf convert images in winform

 

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// A delegate type for hooking up change notifications. public delegate void ProgressChangingEventHandler(object sender, string  e);     /// <summary> /// Author:ESMAEEL ZENDEHDEL zendehdell@yahoo.com /// DATE: 88/11/17 /// Description: A Class For Exporting Image From PDF Files /// License : Free For All /// //Acrobat com /// </summary> class PDFConvertor {     public int pageCount = 0;     Acrobat.CAcroPDDoc pdfDoc = new Acrobat.AcroPDDoc();     Acrobat.CAcroPDPage pdfPage = null;     Acrobat.CAcroRect pdfRect = new Acrobat.AcroRect();     Acrobat.AcroPoint pdfPoint =new Acrobat.AcroPoint();               public event ProgressChangingEventHandler  ExportProgressChanging;       protected virtual void OnExportProgressChanging(string e)     {         Thread.SpinWait(100);       if (ExportProgressChanging != null)             ExportProgressChanging(this, e);     }       #region Convert     /// <summary>     /// Converting PDF Files TO Specified Image Format     /// </summary>     /// <param name="sourceFileName">Source PDF File Path</param>     /// <param name="DestinationPath">Destination PDF File Path</param>     /// <param name="outPutImageFormat">Type Of Exported Image</param>     /// <returns>Returns Count Of Exported Images</returns>     public int Convert(string sourceFileName, string DestinationPath, ImageFormat outPutImageFormat)     {             if (pdfDoc.Open(sourceFileName))         {               // pdfapp.Hide();             pageCount = pdfDoc.GetNumPages();               for (int i = 0; i < pageCount; i++)             {                 pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(i);                     pdfPoint = (Acrobat.AcroPoint)pdfPage.GetSize();                 pdfRect.Left = 0;                 pdfRect.right = pdfPoint.x;                 pdfRect.Top = 0;                 pdfRect.bottom = pdfPoint.y;                   pdfPage.CopyToClipboard(pdfRect, 0, 0, 100);                   string outimg = "";                 string filename=sourceFileName.Substring(sourceFileName.LastIndexOf("\\"));                   if (pageCount == 1)                     outimg = DestinationPath + "\\" + filename + "." + outPutImageFormat.ToString();                 else                     outimg = DestinationPath + "\\" + filename + "_" + i.ToString() + "." + outPutImageFormat.ToString();                                   Clipboard.GetImage().Save(outimg, outPutImageFormat);                   ////////////Firing Progress Event                 OnExportProgressChanging(outimg);             }                 Dispose();         }         else         {             Dispose();             throw new System.IO.FileNotFoundException(sourceFileName +" Not Found!");           }         return pageCount;     }     #endregion       #region Convert With Zoom     /// <summary>     /// Converting PDF Files TO Specified Image Format     /// </summary>     /// <param name="sourceFileName">Source PDF File Path</param>     /// <param name="DestinationPath">Destination PDF File Path</param>     /// <param name="outPutImageFormat">Type Of Exported Image</param>     /// <param name="width">Width Of Exported Images</param>     /// <param name="height">Heiht Of Exported Images</param>     /// <param name="zoom">Zoom Percent</param>     /// <returns>Returns Count Of Exported Images</returns>     public int Convert(string sourceFileName, string DestinationPath, ImageFormat outPutImageFormat, short width, short height, short zoom)     {               if (pdfDoc.Open(sourceFileName))         {               // pdfapp.Hide();             pageCount = pdfDoc.GetNumPages();               for (int i = 0; i < pageCount; i++)             {                 pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(i);                     //  pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();                 pdfRect.Left = 0;                 pdfRect.right = width; //pdfPoint.x;                 pdfRect.Top = 0;                 pdfRect.bottom = height; //pdfPoint.y;                   pdfPage.CopyToClipboard(pdfRect, 0, 0, zoom);                   string outimg = "";                 string filename = sourceFileName.Substring(sourceFileName.LastIndexOf("\\"));                   if (pageCount == 1)                     outimg = DestinationPath + "\\" + filename + "." + outPutImageFormat.ToString();                 else                     outimg = DestinationPath + "\\" + filename + "_" + i.ToString() + "." + outPutImageFormat.ToString();                                     Clipboard.GetImage().Save(outimg, outPutImageFormat);                                ////////////Firing Progress Event                 OnExportProgressChanging(outimg);             }             Dispose();           }         else         {             Dispose();             throw new System.IO.IOException("Specified File Not Found!");         }         return pageCount;     }     #endregion                 #region Destractor     ~PDFConvertor()     {         GC.Collect();         if (pdfPage!=null)             Marshal.ReleaseComObject(pdfPage);         Marshal.ReleaseComObject(pdfPoint);         Marshal.ReleaseComObject(pdfRect);         Marshal.ReleaseComObject(pdfDoc);     }     public void Dispose()     {         GC.Collect();         if (pdfPage != null)             Marshal.ReleaseComObject(pdfPage);         Marshal.ReleaseComObject(pdfPoint);         Marshal.ReleaseComObject(pdfRect);         Marshal.ReleaseComObject(pdfDoc);     }     #endregion   }

　　

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/// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void btnConvert_Click(object sender, EventArgs e)         {             ImageFormat imageFormat = new ImageFormat(Guid.Empty);             switch (comboBox1.SelectedItem.ToString() )             {                 case "Jpeg": imageFormat = ImageFormat.Jpeg; break;                 case "Bmp": imageFormat = ImageFormat.Bmp; break;                 case "Png": imageFormat = ImageFormat.Png; break;                 case "Gif": imageFormat = ImageFormat.Gif; break;             }               pdf = new PDFConvertor();             pdf.ExportProgressChanging += new ProgressChangingEventHandler(p_ExportProgressChanging);                     progressBar1.Visible = true;             int filescount= pdf.Convert(txtInput.Text, txtOutPut.Text, imageFormat);             progressBar1.Visible = false ;             progressBar1.Value = 0;             this.Text = filescount + " Items Exported!";             lblCurrentFileName.Text = "";              System.Diagnostics.Process.Start(txtOutPut.Text);                      }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         void p_ExportProgressChanging(object sender, string e)         {                           lblCurrentFileName.Text = " Extracting " + e.Substring(e.LastIndexOf("\\")) + " !";             progressBar1.Maximum = pdf.pageCount;             progressBar1.Value += 1;             this.Text=lblCount.Text =string.Format("{0}/{1} Extracted!",progressBar1.Value,progressBar1.Maximum);               lblCount.Update();             lblCurrentFileName.Update();         }

　　

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pdf = new PDFConvertor();            imageFormat = ImageFormat.Jpeg;            inputfile = Server.MapPath("pdffile/Top1000WorldBanks2014.pdf");            outpubfile = Server.MapPath("exportimage");                //WEB不可以            // int filescount = pdf.Convert(inputfile, outpubfile, imageFormat);                DateTime startTime = DateTime.Now;             // string inputFile = files[n].ToString();            string outputFile = outpubfile + inputfile.Substring(inputfile.LastIndexOf(@"\") + 1).Replace(".pdf", ".png");                            pdfDoc = (Acrobat.CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");              bool ret = pdfDoc.Open(inputfile);            if (!ret)            {                throw new FileNotFoundException();            }              // Get the number of pages (to be used later if you wanted to store that information)            int pageCount = pdfDoc.GetNumPages();              // Get the first page            pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(0);              pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();              pdfRect = (Acrobat.CAcroRect)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.Rect", "");              pdfRect.Left = 0;            pdfRect.right = pdfPoint.x;            pdfRect.Top = 0;            pdfRect.bottom = pdfPoint.y;              int numPages = pdfDoc.GetNumPages();            //System.Web.HttpContext.Current.Response.Write("numPages: " + numPages);            //System.Web.HttpContext.Current.Response.Write("Size: " + pdfPoint.x + "x" + pdfPoint.y);              double ratio = (double)pdfPoint.x / (double)pdfPoint.y;              // Render to clipboard, scaled by 100 percent (ie. original size)            // Even though we want a smaller image, better for us to scale in .NET            // than Acrobat as it would greek out small text            // see http://www.adobe.com/support/techdocs/1dd72.htm                             bool copyToClipBoardSuccess = pdfPage.CopyToClipboard(pdfRect, 0, 0, 100);              IDataObject clipboardData = Clipboard.GetDataObject();               Response.Write("copyToClipBoardSuccess: " + copyToClipBoardSuccess + ", Clipboard.ContainsImage: " + Clipboard.ContainsImage() + ", Clipboard.ContainsData: " + Clipboard.ContainsData(DataFormats.Bitmap));              //if (clipboardData.GetDataPresent(DataFormats.Bitmap))            //{            //    Bitmap pdfBitmap = (Bitmap)clipboardData.GetData(DataFormats.Bitmap);              //    // Size of generated thumbnail in pixels            //    int biggestSize = 500;            //    int thumbnailWidth = 0;            //    int thumbnailHeight = 0;              //    if (pdfPoint.x >= pdfPoint.y)            //    {            //        thumbnailWidth = biggestSize;            //        thumbnailHeight = Convert.ToInt32((double)thumbnailWidth * ratio);            //    }            //    else            //    {            //        thumbnailHeight = biggestSize;            //        thumbnailWidth = Convert.ToInt32((double)thumbnailHeight * ratio);            //    }                //    // Render to small image using the bitmap class            //    System.Drawing.Image pdfImage = pdfBitmap.GetThumbnailImage(thumbnailWidth, thumbnailHeight, null, IntPtr.Zero);              //    // Create new blank bitmap                                //    Bitmap thumbnailBitmap = new Bitmap(thumbnailWidth, thumbnailHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb);              //    using (Graphics thumbnailGraphics = Graphics.FromImage(thumbnailBitmap))            //    {            //        // Draw rendered pdf image to new blank bitmap            //        thumbnailGraphics.DrawImage(pdfImage, 2, 2, thumbnailWidth, thumbnailHeight);              //        // Save as .png file            //        thumbnailBitmap.Save(outputFile, System.Drawing.Imaging.ImageFormat.Png);              //        //System.Web.HttpContext.Current.Response.Write("Generated thumbnail... " + outputFile);            //    }              //    pdfDoc.Close();              //    // Not sure how why it is to do this, but Acrobat is not the best behaved COM object            //    // see http://blogs.msdn.com/yvesdolc/archive/2004/04/17/115379.aspx            //    Marshal.ReleaseComObject(pdfPage);            //    Marshal.ReleaseComObject(pdfRect);            //    Marshal.ReleaseComObject(pdfDoc);                   //   TimeSpan ts = new TimeSpan(DateTime.Now.Ticks - startTime.Ticks);              //  //System.Web.HttpContext.Current.Response.Write("Parsning tog: " + ts.TotalMilliseconds + " ms");              //  //System.Web.HttpContext.Current.Response.Write("");              //}

　　

from: https://www.codeproject.com/articles/57100/simple-and-free-pdf-to-image-conversion