Load(Stream,Int32,CodecsLoadByteOrder,Int32,Int32) Method

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public RasterImage Load( 
   Stream stream,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)

'Declaration
 
Public Overloads Function Load( _
   ByVal stream As Stream, _
   ByVal bitsPerPixel As Integer, _
   ByVal order As CodecsLoadByteOrder, _
   ByVal firstPage As Integer, _
   ByVal lastPage As Integer _
) As RasterImage

'Usage
 
Dim instance As RasterCodecs
Dim stream As Stream
Dim bitsPerPixel As Integer
Dim order As CodecsLoadByteOrder
Dim firstPage As Integer
Dim lastPage As Integer
Dim value As RasterImage
 
value = instance.Load(stream, bitsPerPixel, order, firstPage, lastPage)

public RasterImage Load( 
   Stream stream,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)

 function Leadtools.Codecs.RasterCodecs.Load(Stream,Int32,CodecsLoadByteOrder,Int32,Int32)( 
   stream ,
   bitsPerPixel ,
   order ,
   firstPage ,
   lastPage 
)

public:
RasterImage^ Load( 
   Stream^ stream,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)

Parameters

stream

A System.IO.Stream containing the image data to load.

bitsPerPixel

Resulting image pixel depth. Valid values are:

Value	Meaning
0	Keep the original file's pixel depth (Do not convert).
1 to 8	The specified bits per pixel in the resulting image.
12	12 bits per pixel in the resulting image.
16	16 bits per pixel in the resulting image.
24	24 bits per pixel in the resulting image.
32	32 bits per pixel in the resulting image.
48	48 bits per pixel in the resulting image.
64	64 bits per pixel in the resulting image.

order

Color order for 16-, 24-, 32-, 48-, and 64-bit images. If the resulting image is less than 16 bits per pixel, this will have no effect since palletized images have no order. The following are valid values.

Value	Meaning
CodecsLoadByteOrder.Rgb	Red, green, and blue color order in memory
CodecsLoadByteOrder.Bgr	Blue, green, and red color order in memory
CodecsLoadByteOrder.Gray	12 or 16-bit grayscale image. 12 and 16-bit grayscale images are only supported in the Document/Medical Imaging editions.
CodecsLoadByteOrder.RgbOrGray	Load the image as red, green, blue OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions
CodecsLoadByteOrder.BgrOrGray	Load the image as blue, green, red OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions
CodecsLoadByteOrder.Romm	ROMM order. ROMM only supports 24 and 48-bit images
CodecsLoadByteOrder.BgrOrGrayOrRomm	Load the image as red, green, blue OR as a 12 or 16-bit grayscale image OR as ROMM. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions only. ROMM only supports 24 and 48-bit color images.

firstPage

1-based index of the first page to load.

lastPage

The 1-based index of the last page to load. Must be greater than or equal to firstPage. You can pass -1 to load from firstPage to the last page in the stream.

Return Value

The Leadtools.RasterImage object that this method loads.

The file can be in any supported image file format and bits per pixel, whether compressed or uncompressed.

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 Image 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.

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

Public Sub LoadStream2Example()
      Dim codecs As RasterCodecs = New RasterCodecs()

      Dim multiPageFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif")

      Dim fs As FileStream = File.OpenRead(multiPageFileName)

      ' 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 first page
      Dim first As Integer = 1
      Dim last As Integer = 1
      Dim image As RasterImage = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
      Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
      Debug.Assert(image.PageCount = last - first + 1)
      image.Dispose()

      ' Load the second page
      first = 2
      last = 2
      image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
      Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
      Debug.Assert(image.PageCount = last - first + 1)
      image.Dispose()

      ' Load from the second page to page before last
      first = 2
      last = info.TotalPages - 1
      image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
      Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
      Debug.Assert(image.PageCount = last - first + 1)
      image.Dispose()

      ' load all the pages
      image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, 1, -1)
      Console.WriteLine("Loading all pages, 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

public void LoadStream2Example()
     {
         RasterCodecs codecs = new RasterCodecs();

         string multiPageFileName = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif");

         FileStream fs = File.OpenRead(multiPageFileName);

         // 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 first page
         int first = 1;
         int last = 1;
         RasterImage image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
         Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
         Debug.Assert(image.PageCount == last - first + 1);
         image.Dispose();

         // Load the second page
         first = 2;
         last = 2;
         image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
         Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
         Debug.Assert(image.PageCount == last - first + 1);
         image.Dispose();

         // Load from the second page to page before last
         first = 2;
         last = info.TotalPages - 1;
         image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
         Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
         Debug.Assert(image.PageCount == last - first + 1);
         image.Dispose();

         // load all the pages
         image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, 1, -1);
         Console.WriteLine("Loading all pages, 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";
}

public void LoadStream2Example(Stream inStreamMultiGif)
{
   RasterCodecs codecs = new RasterCodecs();
   // Get the file information (we are interested in the number of pages)
   CodecsImageInfo info = codecs.GetInformation(inStreamMultiGif, true);
   Debug.WriteLine("Number of pages according to info: {0}", info.TotalPages);

   // Load the first page
   int first = 1;
   int last = 1;
   RasterImage image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
   Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
   Debug.Assert(image.PageCount == last - first + 1);
   image.Dispose();

   // Load the second page
   first = 2;
   last = 2;
   image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
   Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
   Debug.Assert(image.PageCount == last - first + 1);
   image.Dispose();

   // Load from the second page to page before last
   first = 2;
   last = info.TotalPages - 1;
   image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
   Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
   Debug.Assert(image.PageCount == last - first + 1);
   image.Dispose();

   // load all the pages
   image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, 1, -1);
   Debug.WriteLine("Loading all pages, pages loaded = {0}", image.PageCount);
   Debug.Assert(image.PageCount == info.TotalPages);
   image.Dispose();

   inStreamMultiGif.Close();
}

Public Sub LoadStream2Example(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(inStreamMultiGif, True)
   Debug.WriteLine("Number of pages according to info: {0}", info.TotalPages)

   ' Load the first page
   Dim first As Integer = 1
   Dim last As Integer = 1
   Dim image As RasterImage = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
   Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
   Debug.Assert(image.PageCount = last - first + 1)
   image.Dispose()

   ' Load the second page
   first = 2
   last = 2
   image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
   Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
   Debug.Assert(image.PageCount = last - first + 1)
   image.Dispose()

   ' Load from the second page to page before last
   first = 2
   last = info.TotalPages - 1
   image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
   Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
   Debug.Assert(image.PageCount = last - first + 1)
   image.Dispose()

   ' load all the pages
   image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, 1, -1)
   Debug.WriteLine("Loading all pages, pages loaded = {0}", image.PageCount)
   Debug.Assert(image.PageCount = info.TotalPages)
   image.Dispose()

   inStreamMultiGif.Close()
End Sub

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

RasterCodecs Class
RasterCodecs Members
Overload List
Loading and Saving Images
Loading and Saving Large Tiff Files
Speeding Up 1-Bit Documents
Fast File Info