- 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.
Visual Basic (Declaration) | |
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Public Shared Function FromEmf( _ ByVal hemf As IntPtr, _ ByVal width As Integer, _ ByVal height As Integer _ ) As RasterImage |
Visual Basic (Usage) | ![]() |
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Dim hemf As IntPtr Dim width As Integer Dim height As Integer Dim value As RasterImage value = RasterImageConverter.FromEmf(hemf, width, 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
The newly created Leadtools.RasterImage object.
This example loads a Leadtools.RasterImage, converts it to a EMF, then converts the EMF back to a Leadtools.RasterImage.
Visual Basic | ![]() |
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<DllImport("Gdi32", CharSet:=CharSet.Auto)> _ Private Shared Function DeleteEnhMetaFile(ByVal hemf As IntPtr) As Integer End Function Public Sub FromEmfExample() 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) ' Convert it to EMF hemf = RasterImageConverter.ToEmf(image) ' Note, since we converted to an EMF we have two copies of the image in memory and "image" is still usable End Using ' Convert the EMF back to a RasterImage preserving the size Using image As RasterImage = RasterImageConverter.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, Path.Combine(LEAD_VARS.ImagesDir, "Image1_FromEmf.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# | ![]() |
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[DllImport("Gdi32", CharSet = CharSet.Auto)] private static extern int DeleteEnhMetaFile(IntPtr hemf); public void FromEmfExample() { 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)) { // Convert it to EMF hemf = RasterImageConverter.ToEmf(image); // Note, since we converted to an EMF we have two copies of the image in memory and "image" is still usable } // Convert the EMF back to a RasterImage preserving the size using(RasterImage image = RasterImageConverter.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, Path.Combine(LEAD_VARS.ImagesDir, "Image1_FromEmf.bmp"), RasterImageFormat.Bmp, 24); } // Clean up codecs.Dispose(); } static class LEAD_VARS { public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; } |
When this method is completed, there are two copies of the drawing in memory: the new Leadtools.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.
For more information refer to RasterImage and GDI/GDI+.
Target Platforms: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)