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ReadLoadResolutions Method
See Also  Example
Leadtools.Codecs Namespace > RasterCodecs Class : ReadLoadResolutions Method



fileName
A String containing the name of the file to query.
Examines a FlashPix, ECW, PhotoCD, or JBIG file to determine which resolutions it contains.

Syntax

Visual Basic (Declaration) 
Public Function ReadLoadResolutions( _
   ByVal fileName As String _
) As Size()
Visual Basic (Usage)Copy Code
Dim instance As RasterCodecs
Dim fileName As String
Dim value() As Size
 
value = instance.ReadLoadResolutions(fileName)
C# 
public Size[] ReadLoadResolutions( 
   string fileName
)
C++/CLI 
public:
array<Size>^ ReadLoadResolutions( 
   String^ fileName
)

Parameters

fileName
A String containing the name of the file to query.

Return Value

An of Size structures containing the available resolutions.

Example

This example shows how many physical resolutions are available, selects the smallest one, then loads the file.

Visual BasicCopy Code
Private Sub ReadLoadResolutionsExample(ByVal jbigFileName As String)
   RasterCodecs.Startup()
   Dim codecs As RasterCodecs = New RasterCodecs()
   ' Get the number of resolutions (sizes) available in this file
   Dim resolution As Size() = codecs.ReadLoadResolutions(jbigFileName)
   If resolution.Length > 0 Then
      Console.WriteLine("{0} resolutions available", resolution.Length)
      Dim i As Integer = 0
      Do While i < resolution.Length
         Console.WriteLine("{0} by {1}", resolution(i).Width, resolution(i).Height)
         i += 1
      Loop

      ' Set the size to load, the smallest size in this case */
      codecs.Options.Jpeg2000.Load.J2kResolution = resolution(0)

      ' Get the info about the image to show its original size
      Dim info As CodecsImageInfo = codecs.GetInformation(jbigFileName, False)
      Console.WriteLine("Size of image according to GetInformation is {0} by {1}", info.Width, info.Height)

      ' Load the image, keeping the bits per pixel of the file
      Dim image As RasterImage = codecs.Load(jbigFileName)
      Console.WriteLine("Size of image loaded is {0} by {1}", image.Width, image.Height)

      image.Dispose()
   Else
      Console.WriteLine("No resolutions found")
   End If

   ' Clean up
   codecs.Dispose()
   RasterCodecs.Shutdown()
End Sub
C#Copy Code
void ReadLoadResolutionsExample(string jbigFileName) 
{ 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   // Get the number of resolutions (sizes) available in this file 
   Size[] resolution = codecs.ReadLoadResolutions(jbigFileName); 
   if(resolution.Length > 0) 
   { 
      Console.WriteLine("{0} resolutions available", resolution.Length); 
      for(int i = 0; i < resolution.Length; i++) 
         Console.WriteLine("{0} by {1}", resolution[i].Width, resolution[i].Height); 
 
      // Set the size to load, the smallest size in this case */ 
      codecs.Options.Jpeg2000.Load.J2kResolution = resolution[0]; 
 
      // Get the info in of the image to show its original size 
      CodecsImageInfo info = codecs.GetInformation(jbigFileName, false); 
      Console.WriteLine("Size of image according to GetInformation is {0} by {1}", info.Width, info.Height); 
 
      // Load the image, keeping the bits per pixel of the file 
      RasterImage image = codecs.Load(jbigFileName); 
      Console.WriteLine("Size of image loaded is {0} by {1}", image.Width, image.Height); 
 
      image.Dispose(); 
   } 
   else 
      Console.WriteLine("No resolutions found"); 
 
   // Clean up 
   codecs.Dispose(); 
   RasterCodecs.Shutdown(); 
}

Remarks

A FlashPix, ECW, PhotoCD, or JBIG file can contain more than one copy of the same image, each at a different physical resolution (width and height in pixels).

After you get the available resolutions, you can use any of the following to specify the one to be loaded:

For more information, refer to Implementing JBIG Features.

Requirements

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

See Also