Public Shared Function FromEmf( _
   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 = RasterImage.FromEmf(hemf, width, height)

public static RasterImage FromEmf( 
   IntPtr hemf,
   int width,
   int height
)

public:
static RasterImage^ FromEmf( 
   IntPtr hemf,
   int width,
   int height
) 

Parameters

hemf

Handle to the EMF to be converted.

width

Amount by which to scale the enhanced metafiles original width.

height

Amount by which to scale the enhanced metafiles original height.

Return Value

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

Visual Basic

Copy Code

<DllImport("Gdi32", CharSet:=CharSet.Auto)> _ Shared Function DeleteEnhMetaFile(ByVal hemf As IntPtr) As Integer End Function Public Sub FromEmfExample()    RasterCodecs.Startup()    Dim codecs As New RasterCodecs()    ' Load an image    Dim image As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp", 24, CodecsLoadByteOrder.BgrOrGray, 1, 1)    ' Convert it to EMF    Dim hemf As IntPtr = image.ToEmf()    ' Note, since we converted to an EMF we have two copies of the image in memory and "image" is still usable    image.Dispose()    ' Convert the EMF back to a RasterImage preserving the size    image = RasterImage.FromEmf(hemf, 0, 0)    ' Not since we converted from the EMF, we need to delete it ourselves    DeleteEnhMetaFile(hemf)    ' Save it to disk    codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Image1_FromEmf.bmp", RasterImageFormat.Bmp, 24)    image.Dispose()    ' Clean up    codecs.Dispose()    RasterCodecs.Shutdown() End Sub

C#

Copy Code

[DllImport("Gdi32", CharSet = CharSet.Auto)]  static extern int DeleteEnhMetaFile(IntPtr hemf);    public void FromEmfExample()  {     RasterCodecs.Startup();     RasterCodecs codecs = new RasterCodecs();       // Load an image     RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp", 24, CodecsLoadByteOrder.BgrOrGray, 1, 1);       // Convert it to EMF     IntPtr hemf = image.ToEmf();       // Note, since we converted to an EMF we have two copies of the image in memory and "image" is still usable     image.Dispose();       // Convert the EMF back to a RasterImage preserving the size     image = RasterImage.FromEmf(hemf, 0, 0);       // Not since we converted from the EMF, we need to delete it ourselves     DeleteEnhMetaFile(hemf);       // Save it to disk     codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Image1_FromEmf.bmp", RasterImageFormat.Bmp, 24);       image.Dispose();       // Clean up     codecs.Dispose();     RasterCodecs.Shutdown();  }

When this method is completed, there are two copies of the drawing in memory: the new RasterImage object and the original EMF. Freeing one will not affect the other.

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.

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

Reference