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ChangeFromEmf Method
See Also 



hemf
Handle to the EMF to be changed.
width
Amount by which to scale the enhanced metafile's original width.
height
Amount by which to scale the enhanced metafile's original height.
hemf
Handle to the EMF to be changed.
width
Amount by which to scale the enhanced metafile's original width.
height
Amount by which to scale the enhanced metafile's original height.
Changes a Windows Enhanced Metafile (EMF) into a LEADTOOLS Leadtools.RasterImage object and, if successful, frees the Enhanced Metafile.

Syntax

Visual Basic (Declaration) 
Public Shared Function ChangeFromEmf( _
   ByVal hemf As IntPtr, _
   ByVal width As Integer, _
   ByVal height As Integer _
) As RasterImage
Visual Basic (Usage)Copy Code
Dim hemf As IntPtr
Dim width As Integer
Dim height As Integer
Dim value As RasterImage
 
value = RasterImageConverter.ChangeFromEmf(hemf, width, height)
C# 
public static RasterImage ChangeFromEmf( 
   IntPtr hemf,
   int width,
   int height
)
C++/CLI 
public:
static RasterImage^ ChangeFromEmf( 
   IntPtr hemf,
   int width,
   int height
) 

Parameters

hemf
Handle to the EMF to be changed.
width
Amount by which to scale the enhanced metafile's original width.
height
Amount by which to scale the enhanced metafile's original height.

Return Value

The newly created Leadtools.RasterImage object.

Example

This example loads a Leadtools.RasterImage, converts it to a EMF, then converts the EMF back to a Leadtools.RasterImage.

Visual BasicCopy Code
Public Sub ChangeFromEmfExample()
      Dim codecs As New RasterCodecs()

      Dim hemf As IntPtr

      ' Load an image
      Using image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"), 24, CodecsLoadByteOrder.BgrOrGray, 1, 1)
         ' Change to EMF
         hemf = RasterImageConverter.ChangeToEmf(image)
      End Using

      ' Convert the EMF back to a RasterImage preserving the size
      Using image As RasterImage = RasterImageConverter.ChangeFromEmf(hemf, 0, 0)
         ' Save it to disk
         codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Image1_ChangeToEmf.bmp"), RasterImageFormat.Bmp, 24)
      End Using

      ' Clean up
      codecs.Dispose()
   End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
C#Copy Code
public void ChangeFromEmfExample()
   {
      RasterCodecs codecs = new RasterCodecs();

      IntPtr hemf;

      // Load an image
      using(RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"), 24, CodecsLoadByteOrder.BgrOrGray, 1, 1))
      {
         // Change to EMF
         hemf = RasterImageConverter.ChangeToEmf(image);
      }

      // Convert the EMF back to a RasterImage preserving the size
      using(RasterImage image = RasterImageConverter.ChangeFromEmf(hemf, 0, 0))
      {
         // Save it to disk
         codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Image1_ChangeToEmf.bmp"), RasterImageFormat.Bmp, 24);
      }

      // Clean up
      codecs.Dispose();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Remarks

If this function is successful, hemf is freed.

The enhanced metafile can be loaded at the original dimension or scaled by using the width and height parameters.

If width == 0 and height == 0 - the enhanced metafile is loaded at the size present in the file.

If width == 0 and height > 0 - the enhanced metafile is stretched so that it has the height height (preserving the aspect ratio).

If width > 0 and height == 0 - the enhanced metafile is stretched so that it has the width width (preserving the aspect ratio).

If width > 0 and height > 0 - the enhanced metafile is stretched so that it has the width width and height height (the aspect ratio is ignored).

This function does not support signed images.

For more information refer to RasterImage and GDI/GDI+.

Requirements

Target Platforms: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also