Leadtools.Codecs Namespace > Classes > RasterImageTypeConverter

public class RasterImageTypeConverter : System.ComponentModel.TypeConverter  

Public Class RasterImageTypeConverter  
   Inherits System.ComponentModel.TypeConverter 

public ref class RasterImageTypeConverter : public System.ComponentModel.TypeConverter  

// Load all the pages in the TIF file hosted at an HTTP URL 
http://tempuri.org/MyImage.tif 
// Load the first page only of the multi-page TIF file hosted at an HTTP URL 
http://tempuri.org/MyImage.tif?LeadFirstPage=1&LeadLastPage=1 
// Load the second and third page of the multi-page TIF file hosted at an HTTP URL as 24 bits/pixel with RGB color order 
http://tempuri.org/MyImage.tif?LeadBitsPerPixel=24&LeadOrder=Rgb&LeadFirstPage=2&LeadLastPage=3 
// Load all the pages in the TIF file hosted at an FTP site 
ftp://tempuri.org/MyImage.tif 
// Load all the pages in the TIF file in a disk file 
C:\Dir\MyImage.tif 
file:://C:/Dir/MyImage.tif 
file:://myserver/MyImage.tif 
// Load the second and third page of the multi-page TIF file in a disk file as 24 bits/pixel with RGB color order 
C:\Dir\MyImage\MyImage.tif?LeadBitsPerPixel=24&LeadOrder=Rgb&LeadFirstPage=2&LeadLastPage=3 

// Load all the pages in the TIF file set as resource 
"MyImage.tif" 
// Load the first page only of the multi-page TIF file set as a resource 
"MyImage.tif?LeadFirstPage=1&LeadLastPage=1" 
// Load the second and third page of the multi-page TIF file set as a resource as 24 bits/pixel with RGB color order 
"MyImage.tif?LeadBitsPerPixel=24&LeadOrder=Rgb&LeadFirstPage=2&LeadLastPage=3" 
// Load the second and third page of the multi-page TIF file set as a resource as 24 bits/pixel with RGB color order 
"MyImage.tif?LeadBitsPerPixel=24&LeadOrder=Rgb&LeadFirstPage=2&LeadLastPage=3" 
// Silverlight only: Load the image and set it as a WriteableBitmap in a RasterImage 
"MyImage.tif?LeadUseWriteableBitmap=True" 
// Silverlight only: Load the PNG image using Silverlight and set it as a WriteableBitmap in a RasterImage 
"MyImage.tif?LeadUseWriteableBitmap=True&LeadUseNativeLoad=True" 

using Leadtools; 
using Leadtools.Codecs; 
 
public void RasterImageTypeConverterExample() 
{ 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif"); 
 
   // Construct the source URL to use the source file and load the image 
   Uri uri = new Uri(srcFileName); 
 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Create a new instance of the RasterImageTypeConverter class 
   RasterImageTypeConverter rasterImageConverter = new RasterImageTypeConverter(codecs); 
 
   // We should be able to convert from a URL 
   Debug.Assert(rasterImageConverter.CanConvertFrom(uri.GetType())); 
 
   // Convert the image 
 
   // The return value from RasterImageTypeConverter.ConvertFrom might be an image that is 
   // still loading. So, we must subscribe to the RasterCodecs.LoadAsyncCompleteted 
   // event to obtain the finished image 
   codecs.LoadAsyncCompleted += new EventHandler<CodecsLoadAsyncCompletedEventArgs>(rasterImageTypeConverterExample_LoadAsyncCompleted); 
   object rasterImageObject = rasterImageConverter.ConvertFrom(uri); 
 
   // Notice that the returned rasterImageObject is a RasterImage with IsLoading set to true at this point 
   // The IsLoading will be false (and hence, the object will be usable) when the LoadAsyncCompleteted 
   // fires. 
} 
 
private void rasterImageTypeConverterExample_LoadAsyncCompleted(object sender, CodecsLoadAsyncCompletedEventArgs e) 
{ 
   // Check if the user canceled or if we have errors 
   if (e.Cancelled) 
   { 
      Console.WriteLine("Canceled by the user"); 
   } 
   else if (e.Error != null) 
   { 
      Console.WriteLine("Error: " + e.Error.Message); 
   } 
   else 
   { 
      // Everything is OK, get the image 
      RasterImage image = e.Image; 
 
      Console.WriteLine("Image at {0} loaded OK, size: {1} by {2}", e.Uri, image.Width, image.Height); 
 
      image.Dispose(); 
   } 
 
   // Unsubscribe to the event and dispose the RasterCodecs object 
   RasterCodecs codecs = sender as RasterCodecs; 
   codecs.LoadAsyncCompleted -= new EventHandler<CodecsLoadAsyncCompletedEventArgs>(rasterImageTypeConverterExample_LoadAsyncCompleted); 
   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 
 
Public Sub RasterImageTypeConverterExample() 
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif") 
 
   ' Construct the source URL to use the source file and load the image 
   Dim uri As New Uri(srcFileName) 
 
   Dim codecs As New RasterCodecs() 
 
   ' Create a new instance of the RasterImageTypeConverter class 
   Dim rasterImageConverter As New RasterImageTypeConverter(codecs) 
 
   ' We should be able to convert from a URL 
   Debug.Assert(rasterImageConverter.CanConvertFrom(uri.GetType())) 
 
   ' Convert the image 
 
   ' The return value from RasterImageTypeConverter.ConvertFrom might be an image that is 
   ' still loading. So, we must subscribe to the RasterCodecs.LoadAsyncCompleteted 
   ' event to obtain the finished image 
   AddHandler codecs.LoadAsyncCompleted, AddressOf rasterImageTypeConverterExample_LoadAsyncCompleted 
   Dim rasterImageObject As Object = rasterImageConverter.ConvertFrom(uri) 
 
   ' Notice that the returned rasterImageObject is a RasterImage with IsLoading set to true at this point 
   ' The IsLoading will be false (and hence, the object will be usable) when the LoadAsyncCompleteted 
   ' fires. 
End Sub 
 
Private Sub rasterImageTypeConverterExample_LoadAsyncCompleted(ByVal sender As Object, ByVal e As CodecsLoadAsyncCompletedEventArgs) 
   ' Check if the user canceled or if we have errors 
   If e.Cancelled Then 
      Console.WriteLine("Canceled by the user") 
   ElseIf Not IsNothing(e.Error) Then 
      Console.WriteLine("Error: " + e.Error.Message) 
   Else 
      ' Everything is OK, get the image 
      Dim image As RasterImage = e.Image 
 
      Console.WriteLine("Image at {0} loaded OK, size: {1} by {2}", e.Uri, image.Width, image.Height) 
 
      image.Dispose() 
   End If 
 
   ' Unsubscribe to the event and dispose the RasterCodecs object 
   Dim codecs As RasterCodecs = DirectCast(sender, RasterCodecs) 
   RemoveHandler codecs.LoadAsyncCompleted, AddressOf rasterImageTypeConverterExample_LoadAsyncCompleted 
   codecs.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

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