ToWmf Method

Summary

Converts a LEADTOOLS Leadtools.RasterImage object into a Windows Metafile (WMF).

Syntax

C++/CLI

Python

public static IntPtr ToWmf( 
   RasterImage image 
)

public: 
static IntPtr ToWmf(  
   RasterImage^ image 
)

def ToWmf(self,image):

Parameters

image
The source image.

Return Value

A handle to the Windows metafile (WMF) this method creates.

Remarks

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

This method allocates an metafile bitmap and copies the Leadtools.RasterImage data to the Metafile.

When you no longer need the metafile, you can free it using the Windows DeleteMetaFile function.

This method does not support signed images.

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

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
 
[DllImport("Gdi32", CharSet = CharSet.Auto)] 
private static extern int DeleteMetaFile(IntPtr hwmf); 
 
public void FromWmfExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   IntPtr hwmf; 
 
   // Load an image 
   using (RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"), 24, CodecsLoadByteOrder.BgrOrGray, 1, 1)) 
   { 
      // Convert it to WMF 
      hwmf = RasterImageConverter.ToWmf(image); 
 
      // Note, since we converted to an WMF we have two copies of the image in memory and "image" is still usable 
   } 
 
   // Convert the WMF back to a RasterImage preserving the size 
   using (RasterImage image = RasterImageConverter.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, Path.Combine(LEAD_VARS.ImagesDir, "Image1_FromWmf.bmp"), RasterImageFormat.Bmp, 24); 
 
   } 
 
   // Clean up 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}