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ChangeToHBitmap(RasterImage) Method

Summary

Changes a LEADTOOLS Leadtools.RasterImage object to a Windows Device-Dependent Bitmap (DDB).

Syntax

C#
VB
C++
public static IntPtr ChangeToHBitmap( 
   RasterImage image 
) 
Public Overloads Shared Function ChangeToHBitmap( _ 
   ByVal image As Leadtools.RasterImage _ 
) As IntPtr 
public: 
static IntPtr ChangeToHBitmap(  
   Leadtools.RasterImage^ image 
)  

Parameters

image
The source image.

Return Value

A handle to the device dependent bitmap (DDB) this method creates.

Remarks

This method results in only one copy of the image, and it invalidates this Leadtools.RasterImage object. You must call RasterImage.Dispose after calling this method.

For more information on DDBs and DIBs, refer to Using DIBs, DDBs, and the Clipboard.

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

Example

For an example, refer to ChangeToHBitmap(rasterimage). This example loads a Leadtools.RasterImage, changes it to a DDB and then changes it back to Leadtools.RasterImage.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
public void ChangeToHBitmapExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   IntPtr hbitmap; 
 
   // Load an image 
   using (RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"), 24, CodecsLoadByteOrder.BgrOrGray, 1, 1)) 
   { 
      // Change to DDB 
      hbitmap = RasterImageConverter.ChangeToHBitmap(image); 
 
      // Dispose the image since it is unusable now 
   } 
 
   // Change the DDB to a new LEAD RasterImage 
   using (RasterImage image = RasterImageConverter.ChangeFromHBitmap(hbitmap, IntPtr.Zero)) 
   { 
      // Save this image back to disk 
      codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Image1_ChangeToHBitmap.bmp"), RasterImageFormat.Bmp, 24); 
   } 
 
   DeleteObject(hbitmap); 
 
   // Clean up 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Drawing 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
 
Public Sub ChangeToHBitmapExample() 
   Dim codecs As New RasterCodecs() 
 
   Dim hbitmap As IntPtr 
 
   ' Load an image 
   Using image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"), 24, CodecsLoadByteOrder.BgrOrGray, 1, 1) 
      ' Change to DDB 
      hbitmap = RasterImageConverter.ChangeToHBitmap(image) 
 
      ' Dispose the image since it is unusable now 
   End Using 
 
   ' Change the DDB to a new LEAD RasterImage 
   Using image As RasterImage = RasterImageConverter.ChangeFromHBitmap(hbitmap, IntPtr.Zero) 
      ' Save this image back to disk 
      codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Image1_ChangeToHBitmap.bmp"), RasterImageFormat.Bmp, 24) 
   End Using 
 
   DeleteObject(hbitmap) 
 
   ' Clean up 
   codecs.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

Requirements

Target Platforms

Help Version 19.0.2017.10.18
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Leadtools.Drawing Assembly