Public Shared Function FromWmf( _
   ByVal hwmf As IntPtr, _
   ByVal width As Integer, _
   ByVal height As Integer _
) As RasterImage

Visual Basic (Usage)	Copy Code
Dim hwmf As IntPtr Dim width As Integer Dim height As Integer Dim value As RasterImage   value = RasterImage.FromWmf(hwmf, width, height)

public static RasterImage FromWmf( 
   IntPtr hwmf,
   int width,
   int height
)

public:
static RasterImage^ FromWmf( 
   IntPtr hwmf,
   int width,
   int height
) 

Parameters

hwmf

Handle to the WMF to be converted.

width

Amount by which to scale the metafile's original width.

height

Amount by which to scale the metafile's original height.

Return Value

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

Visual Basic

Copy Code

<DllImport("Gdi32", CharSet:=CharSet.Auto)> _ Shared Function DeleteMetaFile(ByVal hwmf As IntPtr) As Integer End Function Public Sub FromWmfExample()    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 WMF    Dim hwmf As IntPtr = image.ToWmf()    ' Note, since we converted to an WMF we have two copies of the image in memory and "image" is still usable    image.Dispose()    ' Convert the WMF back to a RasterImage preserving the size    image = RasterImage.FromWmf(hwmf, 0, 0)    ' Not since we converted from the WMF, we need to delete it ourselves    DeleteMetaFile(hwmf)    ' Save it to disk    codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Image1_FromWmf.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 DeleteMetaFile(IntPtr hwmf);    public void FromWmfExample()  {     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 WMF     IntPtr hwmf = image.ToWmf();       // Note, since we converted to an WMF we have two copies of the image in memory and "image" is still usable     image.Dispose();       // Convert the WMF back to a RasterImage preserving the size     image = RasterImage.FromWmf(hwmf, 0, 0);       // Not since we converted from the WMF, we need to delete it ourselves     DeleteMetaFile(hwmf);       // Save it to disk     codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Image1_FromWmf.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 WMF. Freeing one will not affect the other.

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

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

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

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

If width > 0 and height > 0 - the 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