Within a PDF document, each page may have zero or one thumbnail images associated with it. These thumbnails are stored within the PDF document. PDF Xpress™ can be used to create or delete thumbnails within the PDF document.

Create Thumbnails

Thumbnails can be created on a specified page from image information accessed from file, handle, memory, or ImageDataInfo object. To create a thumbnail use the CreateThumbnail methods.

C# Example	Copy Code
// This code demonstrates how to add a thumbnail from a file Accusoft.PdfXpressSdk.PdfXpress pdfXpress1 = null; Document document = null; try { pdfXpress1 = new PdfXpress(); pdfXpress1.Initialize(); document = New Document(pdfXpress1, " C:\test.pdf"); document.CreateThumbnail(0, "C:\testImage.jpg", 0); } catch (System.Exception ex) { } finally { if ( null != document ) document.Dispose( ); if ( null != pdfXpress1 ) pdfXpress1.Dispose( ); }

C# Example

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// This code demonstrates how to add a thumbnail from a file 
Accusoft.PdfXpressSdk.PdfXpress pdfXpress1 = null;
Document document = null;
try
  {
            pdfXpress1 = new PdfXpress();
            pdfXpress1.Initialize();
            document = New Document(pdfXpress1, " C:\test.pdf");
            document.CreateThumbnail(0, "C:\testImage.jpg", 0);
  }
  catch (System.Exception ex)
  {
  }
  finally
  {
            if ( null != document ) document.Dispose( );
            if ( null != pdfXpress1 ) pdfXpress1.Dispose( );
  }

C# Example	Copy Code
// This code demonstrates how to add a thumbnail from Global Memory public void AddThumbnailFromGlobalMemory( Document document, Int32 pageIndex, IntPtr globalBufferHandlePtr, Int32 imagePageIndex ) { try { document.CreateThumbnail ( pageIndex , globalBufferHandlePtr , imagePageIndex ) ; } catch ( PdfXpressLibraryException ) { } // A problem was encountered attempting to add image. catch ( PdfXpressException ) { } // A problem was encountered attempting to add image. finally { } } }

C# Example

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// This code demonstrates how to add a thumbnail from Global Memory 
public void AddThumbnailFromGlobalMemory( Document document, Int32 pageIndex,
IntPtr globalBufferHandlePtr, Int32 imagePageIndex )
{
            try
            {
                document.CreateThumbnail      ( pageIndex
                                                              , globalBufferHandlePtr
                                                              , imagePageIndex
                                                              ) ;
            }
            catch ( PdfXpressLibraryException )     { } // A problem was encountered attempting to add image.
            catch ( PdfXpressException )               { } // A problem was encountered attempting to add image.
            finally  { }
            }
}

C# Example	Copy Code
// This code demonstrates how to add a thumbnail from Local Memory public void AddThumbnailFromLocalMemory( Document document, Int32 pageIndex, byte[ ] imageData, Int32 imagePageIndex ) { try { document.CreateThumbnail ( pageIndex , imageData , imagePageIndex ) ; } catch ( PdfXpressLibraryException ) { } // A problem was encountered attempting to add image. catch ( PdfXpressException ) { } // A problem was encountered attempting to add image. finally { } } }

C# Example

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// This code demonstrates how to add a thumbnail from Local Memory 
public void AddThumbnailFromLocalMemory( Document document, Int32 pageIndex, 
byte[ ] imageData, Int32 imagePageIndex )
{
            try
            {
                    document.CreateThumbnail        ( pageIndex
                                                                    , imageData
                                                                    , imagePageIndex
                                                                    ) ;
            }
            catch ( PdfXpressLibraryException )     { } // A problem was encountered attempting to add image.
            catch ( PdfXpressException )               { } // A problem was encountered attempting to add image.
            finally  { }
            }
}

Delete Thumbnails

To delete a thumbnail on a specified page of the PDF document, call the DeleteThumbnail method.

C# Example	Copy Code
// This code demonstrates how to delete a thumbnail Accusoft.PdfXpressSdk.PdfXpress pdfXpress1 = null; Document document = null; try { pdfXpress1 = new PdfXpress(); pdfXpress1.Initialize(); document = new Document (pdfXpress1, "C:\\pdfsample.pdf"); int pageNumber = 0; document. DeleteThumbnail(0); } catch (System.Exception ex) { } finally { if ( null != document ) document.Dispose( ); if ( null != pdfXpress1 ) pdfXpress1.Dispose( ); }

C# Example

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// This code demonstrates how to delete a thumbnail 
Accusoft.PdfXpressSdk.PdfXpress pdfXpress1 = null;
Document document = null;
try
{
      pdfXpress1 = new PdfXpress();
      pdfXpress1.Initialize();
      document = new Document (pdfXpress1, "C:\\pdfsample.pdf");
      int pageNumber = 0;
      document. DeleteThumbnail(0);
}
catch (System.Exception ex)
{
}
finally
{
      if ( null != document ) document.Dispose( );
      if ( null != pdfXpress1 ) pdfXpress1.Dispose( );
}

Accusoft.PdfXpress5.Net
Create & Delete Thumbnails
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Create Thumbnails

Delete Thumbnails

See Also