Load(Stream) Method

Summary

Loads the specified image stream using default options.

Syntax

Objective-C

C++

Java

public RasterImage Load( 
   Stream stream 
)

Public Overloads Function Load( _ 
   ByVal stream As Stream _ 
) As RasterImage

- (nullable LTRasterImage *)loadStream:(LTLeadStream *)stream  
                                 error:(NSError **)error;

public RasterImage load(ILeadStream stream)

public: 
RasterImage^ Load(  
   Stream^ stream 
)

Parameters

stream
A Stream containing the image data to load.

Return Value

The RasterImage object that this method loads.

Remarks

The stream can point to any supported image file format and bits per pixel, whether compressed or uncompressed.

This method can load all the pages in a multipage file. For more information, refer to the last remark. The resulting image will have the same bits/pixel and color order value of the image as it was stored in the stream.

LEADTOOLS will attempt to load corrupted files so you can see at least a portion of the image. For these images, the load methods succeed, but LoadStatus will return an error code.

Use the CodecsLoadOptions class to set up other load option parameters before calling this method.

Support for 12 and 16-bit grayscale, and 48 and 64-bit color images is only available in the Document/Medical Imaging editions.

For supported formats, refer to Summary of All Supported File Formats.

LEADTOOLS loads all PDF files as Raster PDF uncompressed RasterImageFormat.RasPdf, regardless of the compression and color space used when saving the file.

The CodecsLoadOptions.AllPages property controls whether RasterCodecs will try to load all pages or just the first page if the image data contains multiple pages. To load a single page from a stream, use Load(Stream stream, int pageNumber).

Example

This example will load all the pages from a stream that contains a single multipage file

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
using LeadtoolsExamples.Common; 
 
public void LoadStream1Example() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.Options.Load.AllPages = true; 
   string singlePageFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string multiPageFileName = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif"); 
 
   // Load the file into a stream 
   FileStream fs = File.OpenRead(singlePageFileName); 
 
   // Get the file information (we are interested in the number of pages) 
   CodecsImageInfo info = codecs.GetInformation(fs, true); 
   Console.WriteLine("Number of pages according to info: {0}", info.TotalPages); 
 
   // Load the image and verify that we loaded all the pages 
   RasterImage image = codecs.Load(fs); 
   Console.WriteLine("Number of pages loaded: {0}", image.PageCount); 
   Debug.Assert(image.PageCount == info.TotalPages); 
 
   image.Dispose(); 
   fs.Close(); 
 
   // Repeat for a multipage file 
 
   fs = File.OpenRead(multiPageFileName); 
 
   info = codecs.GetInformation(fs, true); 
   Console.WriteLine("Number of pages according to info: {0}", info.TotalPages); 
 
   image = codecs.Load(fs); 
   Console.WriteLine("Number of pages loaded: {0}", image.PageCount); 
   Debug.Assert(image.PageCount == info.TotalPages); 
 
   image.Dispose(); 
   fs.Close(); 
 
   // Clean up 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
Imports Leadtools.Svg 
 
Public Sub LoadStream1Example() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   Dim singlePageFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") 
   Dim multiPageFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif") 
 
   ' Load the file into a stream 
   Dim fs As FileStream = File.OpenRead(singlePageFileName) 
 
   ' Get the file information (we are interested in the number of pages) 
   Dim info As CodecsImageInfo = codecs.GetInformation(fs, True) 
   Console.WriteLine("Number of pages according to info: {0}", info.TotalPages) 
 
   ' Load the image and verify that we loaded all the pages 
   Dim image As RasterImage = codecs.Load(fs) 
   Console.WriteLine("Number of pages loaded: {0}", image.PageCount) 
   Debug.Assert(image.PageCount = info.TotalPages) 
 
   image.Dispose() 
   fs.Close() 
 
   ' Repeat for a multipage file 
 
   fs = File.OpenRead(multiPageFileName) 
 
   info = codecs.GetInformation(fs, True) 
   Console.WriteLine("Number of pages according to info: {0}", info.TotalPages) 
 
   image = codecs.Load(fs) 
   Console.WriteLine("Number of pages loaded: {0}", image.PageCount) 
   Debug.Assert(image.PageCount = info.TotalPages) 
 
   image.Dispose() 
   fs.Close() 
 
   ' Clean up 
   codecs.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class

c#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Examples; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Windows.Media; 
 
public void LoadStream1Example(Stream inStreamSingleCmp, Stream inStreamMultiGif) 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Get the file information (we are interested in the number of pages) 
   CodecsImageInfo info = codecs.GetInformation(inStreamSingleCmp, true); 
   Debug.WriteLine("Number of pages according to info: {0}", info.TotalPages); 
 
   // Load the image and verify that we loaded all the pages 
   RasterImage image = codecs.Load(inStreamSingleCmp); 
   Debug.WriteLine("Number of pages loaded: {0}", image.PageCount); 
   Debug.Assert(image.PageCount == info.TotalPages); 
   image.Dispose(); 
 
   // Repeat for a multipage file 
   info = codecs.GetInformation(inStreamMultiGif, true); 
   Debug.WriteLine("Number of pages according to info: {0}", info.TotalPages); 
 
   image = codecs.Load(inStreamMultiGif); 
   Debug.WriteLine("Number of pages loaded: {0}", image.PageCount); 
   Debug.Assert(image.PageCount == info.TotalPages); 
   image.Dispose(); 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Windows.Media 
 
Public Sub LoadStream1Example(ByVal inStreamSingleCmp As Stream, ByVal inStreamMultiGif As Stream) 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   ' Get the file information (we are interested in the number of pages) 
   Dim info As CodecsImageInfo = codecs.GetInformation(inStreamSingleCmp, True) 
   Debug.WriteLine("Number of pages according to info: {0}", info.TotalPages) 
 
   ' Load the image and verify that we loaded all the pages 
   Dim image As RasterImage = codecs.Load(inStreamSingleCmp) 
   Debug.WriteLine("Number of pages loaded: {0}", image.PageCount) 
   Debug.Assert(image.PageCount = info.TotalPages) 
   image.Dispose() 
 
   ' Repeat for a multipage file 
   info = codecs.GetInformation(inStreamMultiGif, True) 
   Debug.WriteLine("Number of pages according to info: {0}", info.TotalPages) 
 
   image = codecs.Load(inStreamMultiGif) 
   Debug.WriteLine("Number of pages loaded: {0}", image.PageCount) 
   Debug.Assert(image.PageCount = info.TotalPages) 
   image.Dispose() 
End Sub