Public Overloads Function Load( _
   ByVal uri As Uri, _
   ByVal bitsPerPixel As Integer, _
   ByVal order As CodecsLoadByteOrder, _
   ByVal firstPage As Integer, _
   ByVal lastPage As Integer _
) As RasterImage

Visual Basic (Usage)	Copy Code
Dim instance As RasterCodecs Dim uri As Uri Dim bitsPerPixel As Integer Dim order As CodecsLoadByteOrder Dim firstPage As Integer Dim lastPage As Integer Dim value As RasterImage   value = instance.Load(uri, bitsPerPixel, order, firstPage, lastPage)

public RasterImage Load( 
   Uri uri,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)

public:
RasterImage Load( 
   Uri uri,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
) 

Parameters

uri

The Uri containing the input image data.

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 file.

Return Value

This example will load an image from a uri with different bits per pixel

Visual Basic

Copy Code

Public Sub LoadUri2Example()    RasterCodecs.Startup()    Dim codecs As New RasterCodecs()    ' Load the image with 1 bits/pixel    Dim uri As New Uri("http://www.leadtools.com/images/15-homepg-banner.jpg")    Dim image As RasterImage = codecs.Load(uri, 1, CodecsLoadByteOrder.Rgb, 1, 1)    ' Show information about tha image    Console.WriteLine("Size: {0} by {1} pixels", image.Width, image.Height)    Console.WriteLine("Bits/Pixel: {0}", image.BitsPerPixel)    image.Dispose()    ' Clean up    codecs.Dispose()    RasterCodecs.Shutdown() End Sub

C#

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public void LoadUri2Example()  {     RasterCodecs.Startup();     RasterCodecs codecs = new RasterCodecs();       // Load the image with 1 bits/pixel     Uri uri = new Uri(@"http://www.leadtools.com/images/15-homepg-banner.jpg");     RasterImage image = codecs.Load(uri, 1, CodecsLoadByteOrder.Rgb, 1, 1);       // Show information about tha image     Console.WriteLine("Size: {0} by {1} pixels", image.Width, image.Height);     Console.WriteLine("Bits/Pixel: {0}", image.BitsPerPixel);     image.Dispose();       // Clean up     codecs.Dispose();     RasterCodecs.Shutdown();  }

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

This method will load all the pages in a multipage file. The resulting image will have the same bits/pixel and color order value of the image as it was stored in the file.

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 options parameters before calling this method.

Support for 12 and 16-bit grayscale 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.

LEADTOOLS supports the following URI schemes:

Scheme	Description
UriSchemeFile	Specifies that the URI is a disk file in local machine or universal naming convention (UNC) path.
UriSchemeHttp	Specifies that the URI is accessed through the Hypertext Transfer Protocol (HTTP).
UriSchemeHttps	Specifies that the URI is accessed through the Secure Hypertext Transfer Protocol (HTTPS).
UriSchemeFtp	Specifies that the URI is accessed through the File Transfer Protocol (FTP).

If uri points to a resource in a UriSchemeHttp, UriSchemeHttps or UriSchemeFtp, then this RasterCodecs will attempt to download image data in an iterative fashion by creating a temporary buffer. The size of this buffer can be determined and changed by setting up the UriOperationBufferSize prior to calling this method.

For authentical and proxy settings, refer to UriOperationCredentials and UriOperationProxy.

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

Reference