Thumbnail View of PDF

Pre-requisites

The full version of Adobe Acrobat (the free reader does not expose the COM interfaces) which exposes a COM library of objects to manipulate and access PDF information.
The Adobe Acrobat 5.0 SDK which is a free download from the Adobe Solutions Network website (note: the site requires registration). The latest SDK for Acrobat 10.0 requires paid membership, so we will use the previous SDK version. 

How Thumbnail View of PDF Generated Programmatically

·        In this code I used Acrobat for dll to generate Thumbnail view of PDF

Acrobat.CAcroPDDoc pdfDoc;

Acrobat.CAcroPDPage pdfPage;

Acrobat.CAcroRect pdfRect;

Acrobat.CAcroPoint pdfPoint;

·        Read PDF

Type AcrobatPDDocType;

AcrobatPDDocType = Type.GetTypeFromProgID("AcroExch.PDDoc");

pdfDoc = (Acrobat.CAcroPDDoc)Activator.CreateInstance(AcrobatPDDocType);

pdfDoc.Open(pdfpath);

·        Get first page of PDF

pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(0);

·        Create Rectangle size for generating PDF Image 
        pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();

Type AcrobatpdfRectType
AcrobatpdfRectType = Type.GetTypeFromProgID("AcroExch.Rect");          
 pdfRect = (Acrobat.CAcroRect)Activator.CreateInstance(AcrobatpdfRectType);

pdfRect.Left = 0; 
pdfRect.right = pdfPoint.x;
pdfRect.Top = 0;
pdfRect.bottom = pdfPoint.y;

·        Copy the PDF Image To Clipboard

 pdfPage.CopyToClipboard(pdfRect, 0, 0, 100);

·        Get the Image from Clipboard using Thread(For Windows application no need of thread)

 Thread cbThread = new Thread(new ThreadStart(CopyToClipboard));

 cbThread.ApartmentState = ApartmentState.STA;

 cbThread.Start();

 cbThread.Join();

       

 Function:            

 [STAThread]

 protected void CopyToClipboard()

 {

            IDataObject data = Clipboard.GetDataObject();

            pdfBitmap = (System.Drawing.Bitmap)data.GetData(DataFormats.Bitmap);

 }

·        Finally Create Thumbnail Image of PDF in specified folder

 Image pdfImage = pdfBitmap.GetThumbnailImage(thumbnailWidth, thumbnailHeight,

                                                         null, IntPtr.Zero);

 Bitmap thumbnailBitmap = new Bitmap(thumbnailWidth + 7, thumbnailHeight + 7,

                                                System.Drawing.Imaging.PixelFormat.Format32bppArgb);

templateBitmap.MakeTransparent();

       

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(OutputImagePath, System.Drawing.Imaging.ImageFormat.Png);

}

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);

·        Now we can use the OutputImagePath for thumbnail view of Particular PDF