DocumentImageManager Class

Visual Basic
C#
Objective-C
Java
C++

public class DocumentImageManager

'Declaration
 
Public Class DocumentImageManager

'Usage
 
Dim instance As DocumentImageManager

public ref class DocumentImageManager

An instance of the DocumentImageManager isn't created directly, instead access the instance automatically created inside a DocumentReader using the DocumentReader.ImageManager property.

The DocumentImageManager contains the following functionality:

The GetPageImage method: Gets a raster image rendering of a page in this document.
The GetThumbnail method: Gets a thumbnail of a page in this document.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Forms
Imports Leadtools.Forms.DocumentReaders
Imports Leadtools.WinForms
Imports Leadtools.Forms.Ocr
Imports Leadtools.Drawing

Public Sub DocumentImageManagerExample()
   ' Get a document from the user
   Dim documentFileName As String

   Using openDlg As New OpenFileDialog()
      If openDlg.ShowDialog() <> System.Windows.Forms.DialogResult.OK Then
         Return
      End If

      documentFileName = openDlg.FileName
   End Using

   ' Load the document at 300 DPI for high quality rendering
   Dim loadOptions As New DocumentReaderLoadOptions()
   loadOptions.Resolution = 300
   Using reader As DocumentReader = DocumentReader.Create(documentFileName, loadOptions)
      ' Ask the user for the output TIFF file name
      Dim tiffFileName As String

      Using saveDlg As New SaveFileDialog()
         saveDlg.Filter = "TIFF files|*.tif;*.tiff|All Files|*.*"
         If saveDlg.ShowDialog() <> System.Windows.Forms.DialogResult.OK Then
            Return
         End If

         tiffFileName = saveDlg.FileName

         If File.Exists(tiffFileName) Then
            ' Because we will append pages, delete the file if it already exists
            File.Delete(tiffFileName)
         End If
      End Using

      ' Loop through all the pages and get a render of each
      For Each page As DocumentReaderPage In reader.Pages
         Using pageImage As RasterImage = reader.ImageManager.GetPageImage(page)
            ' Save it to the output file, we can use the RasterCodecs object
            ' of the reader
            reader.RasterCodecsInstance.Save(pageImage, tiffFileName, RasterImageFormat.TifJpeg, _
                                             24, 1, 1, -1, CodecsSavePageMode.Append)
         End Using
      Next
   End Using
End Sub

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Forms;
using Leadtools.Forms.DocumentReaders;
using Leadtools.WinForms;
using Leadtools.Forms.Ocr;
using Leadtools.Drawing;

public void DocumentImageManagerExample()
{
   // Get a document from the user
   string documentFileName;

   using(OpenFileDialog openDlg = new OpenFileDialog())
   {
      if(openDlg.ShowDialog() != DialogResult.OK)
      {
         return;
      }

      documentFileName = openDlg.FileName;
   }

   // Load the document at 300 DPI for high quality rendering
   DocumentReaderLoadOptions loadOptions = new DocumentReaderLoadOptions();
   loadOptions.Resolution = 300;
   using(DocumentReader reader = DocumentReader.Create(documentFileName, loadOptions))
   {
      // Ask the user for the output TIFF file name
      string tiffFileName;

      using(SaveFileDialog saveDlg = new SaveFileDialog())
      {
         saveDlg.Filter = "TIFF files|*.tif;*.tiff|All Files|*.*";
         if(saveDlg.ShowDialog() != DialogResult.OK)
         {
            return;
         }

         tiffFileName = saveDlg.FileName;

         if(File.Exists(tiffFileName))
         {
            // Because we will append pages, delete the file if it already exists
            File.Delete(tiffFileName);
         }
      }

      // Loop through all the pages and get a render of each
      foreach(DocumentReaderPage page in reader.Pages)
      {
         using(RasterImage pageImage = reader.ImageManager.GetPageImage(page))
         {
            // Save it to the output file, we can use the RasterCodecs object
            // of the reader
            reader.RasterCodecsInstance.Save(pageImage, tiffFileName, RasterImageFormat.TifJpeg, 24, 1, 1, -1, CodecsSavePageMode.Append);
         }
      }
   }
}

Target Platforms

Reference

DocumentImageManager Members
Leadtools.Forms.DocumentReaders Namespace