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ChangeFromWmf Method
See Also  Example
Leadtools Namespace > RasterImage Class : ChangeFromWmf Method



hwmf
Handle to the WMF to be changed.
width
Amount by which to scale the metafiles original width.
height
Amount by which to scale the metafiles original height.
Changes a Windows metafile (WMF) into a LEAD RasterImage object and, if successful, frees the metafile.

Syntax

Visual Basic (Declaration)  
Public Shared Function ChangeFromWmf( _
   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.ChangeFromWmf(hwmf, width, height)
C#  
public static RasterImage ChangeFromWmf( 
   IntPtr hwmf,
   int width,
   int height
)
C++/CLI  
public:
static RasterImage^ ChangeFromWmf( 
   IntPtr hwmf,
   int width,
   int height
) 

Parameters

hwmf
Handle to the WMF to be changed.
width
Amount by which to scale the metafiles original width.
height
Amount by which to scale the metafiles original height.

Return Value

The newly create RasterImage object.

Example

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

Visual Basic Copy Code
Public Sub ChangeFromWmfExample()
   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)

   ' Change to WMF
   Dim hwmf As IntPtr = image.ChangeToWmf()
   image.Dispose()

   ' Convert the WMF back to a RasterImage preserving the size
   image = RasterImage.ChangeFromWmf(hwmf, 0, 0)

   ' Save it to disk
   codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Image1_ChangeFromWmf.bmp", RasterImageFormat.Bmp, 24)

   image.Dispose()

   ' Clean up
   codecs.Dispose()
   RasterCodecs.Shutdown()
End Sub
C# Copy Code
public void ChangeFromWmfExample() 

   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Load an image 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp", 24, CodecsLoadByteOrder.BgrOrGray, 1, 1); 
 
   // Change to WMF 
   IntPtr hwmf = image.ChangeToWmf(); 
   image.Dispose(); 
 
   // Convert the WMF back to a RasterImage preserving the size 
   image = RasterImage.ChangeFromWmf(hwmf, 0, 0); 
 
   // Save it to disk 
   codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Image1_ChangeFromWmf.bmp", RasterImageFormat.Bmp, 24); 
 
   image.Dispose(); 
 
   // Clean up 
   codecs.Dispose(); 
   RasterCodecs.Shutdown(); 
}

Remarks

If this function is successful, hwmf is freed.

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.

Requirements

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

See Also