DecodeImage Method

C#
Visual Basic
Objective-C
Java
C++

public RasterImage DecodeImage( 
   string imageObjectNumber
)

'Declaration

Public Function DecodeImage( _
   ByVal imageObjectNumber As String _
) As RasterImage

'Usage

Dim instance As PDFDocument
Dim imageObjectNumber As String
Dim value As RasterImage
 
value = instance.DecodeImage(imageObjectNumber)

public RasterImage decodeImage(String imageObjectNumber)

public:
RasterImage^ DecodeImage( 
   String^ imageObjectNumber
)

Parameters

imageObjectNumber: String that specifies the PDF image object number to decode.

Return Value

A Leadtools.RasterImage object.

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

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Controls
Imports Leadtools.Pdf
Imports Leadtools.Svg
Imports Leadtools.WinForms

<TestMethod> _
Public Sub PDFDocumentDecodeImageExample()
  Dim sourceFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.pdf")
  Dim destinationFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "LEAD_pdfDecodeImage.tif")
  Using document As PDFDocument = New PDFDocument(sourceFileName)
    document.Resolution = 200

    ' Parse the objects in all pages
    document.ParsePages(PDFParsePagesOptions.Objects, 1, -1)

    Dim codecs As RasterCodecs = New RasterCodecs()
    For Each page As PDFDocumentPage In document.Pages
       If Not page.Objects Is Nothing AndAlso page.Objects.Count > 0 Then
         For Each obj As PDFObject In page.Objects
           If obj.ObjectType = PDFObjectType.Image Then
             Using image As RasterImage = document.DecodeImage(obj.ImageObjectNumber)
                codecs.Save(image, destinationFileName, RasterImageFormat.TifLzw, image.BitsPerPixel, 1, 1, -1, CodecsSavePageMode.Append)
             End Using
           End If
         Next obj
       End If
    Next page

    codecs.Dispose()
  End Using
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Controls;
using Leadtools.Pdf;
using Leadtools.Svg;
using Leadtools.WinForms;

[TestMethod]
public void PDFDocumentDecodeImageExample()
{
   string sourceFileName = Path.Combine(LEAD_VARS.ImagesDir, @"Leadtools.pdf");
   string destinationFileName = Path.Combine(LEAD_VARS.ImagesDir, @"LEAD_pdfDecodeImage.tif");
   using (PDFDocument document = new PDFDocument(sourceFileName))
   {
      document.Resolution = 200;

      // Parse the objects in all pages
      document.ParsePages(PDFParsePagesOptions.Objects, 1, -1);

      RasterCodecs codecs = new RasterCodecs();
      foreach (PDFDocumentPage page in document.Pages)
         if (page.Objects != null && page.Objects.Count > 0)
            foreach (PDFObject obj in page.Objects)
               if (obj.ObjectType == PDFObjectType.Image)
                  using (RasterImage image = document.DecodeImage(obj.ImageObjectNumber))
                     codecs.Save(image, destinationFileName, RasterImageFormat.TifLzw, image.BitsPerPixel, 1, 1, -1, CodecsSavePageMode.Append);

      codecs.Dispose();
   }
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Target Platforms

Reference

PDFDocument Class
PDFDocument Members