LoadAsync(ILeadStream,Int32) Method

public IAsyncOperation<RasterImage> LoadAsync( 
   ILeadStream stream,
   int pageNumber
)

'Declaration
 
Public Overloads Function LoadAsync( _
   ByVal stream As ILeadStream, _
   ByVal pageNumber As Integer _
) As IAsyncOperation(Of RasterImage)

'Usage
 
Dim instance As RasterCodecs
Dim stream As ILeadStream
Dim pageNumber As Integer
Dim value As IAsyncOperation(Of RasterImage)
 
value = instance.LoadAsync(stream, pageNumber)

public IAsyncOperation<RasterImage> LoadAsync( 
   ILeadStream stream,
   int pageNumber
)

 function Leadtools.Codecs.RasterCodecs.LoadAsync(ILeadStream,Int32)( 
   stream ,
   pageNumber 
)

public:
IAsyncOperation<RasterImage^>^ LoadAsync( 
   ILeadStream^ stream,
   int pageNumber
) 

Parameters

stream

An Leadtools.ILeadStream containing the image data to load.

pageNumber

The page number to query. Pass 1 for the first page (default).

Return Value

LEADTOOLS will attempt to load corrupted files so you can see at least a portion of the image. For such images, the load methods succeed, but the 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 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.

The RasterCodecs class supports loading image files asynchronously using the LoadAsync methods. When calling any of these methods, the caller thread will not be blocked and the method will return instantly with an instance of Leadtools.RasterImage that is in a loading status (RasterImage.IsLoading set to true). Do not use the other properties of this object while the object is in loading status.

When the RasterCodecs object finishes loading the image, the various properties of the Leadtools.RasterImage will be populated with the image information and data and the RasterImage.IsLoading property will be set to false.

Do not poll the RasterImage.IsLoading property to whether the image has finished loading. Instead, subscribe to the IAsyncOperation.Completed event to get notification when the LoadAsync(String,LeadRect,Int32,CodecsLoadByteOrder,Int32,Int32,Object) operation has completed and whether any errors occurred.

When this method completes, it returns the image as a Leadtools.RasterImage.

For an example, refer to LoadAsync(ILeadStream).

Target Platforms

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