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LEADTOOLS (Leadtools assembly)
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ChangeToDib Method








Leadtools Namespace > RasterImage Class : ChangeToDib Method
Type of DIB to create. Possible values are:
Value Meaning
RasterConvertToDibType.BitmapInfoHeader DIB that uses a BITMAPINFOHEADER
RasterConvertToDibType.BitmapV4Header DIB that uses a BITMAPV4HEADER. (Introduced in Windows 95 and Windows NT 4.0)
RasterConvertToDibType.BitmapV5Header DIB that uses a BITMAPV5HEADER (Introduced in Windows 2000 and Windows 98)
Changes a LEAD RasterImage object to a Windows Device Independent Bitmap (DIB).
Syntax
public IntPtr ChangeToDib( 
   RasterConvertToDibType type
)
'Declaration
 

Public Function ChangeToDib( _
   ByVal type As RasterConvertToDibType _
) As IntPtr
'Usage
 

Dim instance As RasterImage
Dim type As RasterConvertToDibType
Dim value As IntPtr
 
value = instance.ChangeToDib(type)
public IntPtr ChangeToDib( 
   RasterConvertToDibType type
)
 function Leadtools.RasterImage.ChangeToDib( 
   type 
)

public:
IntPtr ChangeToDib( 
   RasterConvertToDibType type
)

Parameters

type
Type of DIB to create. Possible values are:
Value Meaning
RasterConvertToDibType.BitmapInfoHeader DIB that uses a BITMAPINFOHEADER
RasterConvertToDibType.BitmapV4Header DIB that uses a BITMAPV4HEADER. (Introduced in Windows 95 and Windows NT 4.0)
RasterConvertToDibType.BitmapV5Header DIB that uses a BITMAPV5HEADER (Introduced in Windows 2000 and Windows 98)

Return Value

A handle to the device independent bitmap (DIB) this method creates.
Remarks

A DIB consists of one of the following:

followed by a color table and then the bitmap data. The resulting DIB type is determined by the value of the type parameter.

The orientation of the image and color order will depend on how the image was loaded into the RasterImage.

When you no longer need the DIB, you can free it using the Windows GlobalFree function.

This method does not support signed data images. It will throw an exception of type RasterException with code value RasterExceptionCode.SignedDataNotSupported if this RasterImage has a signed data image.

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

Example

This example loads a RasterImage, changes it to a V5 DIB and writes out the DIB as a bitmap file.

Copy Code   
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg

<DllImport("Kernel32", CharSet:=CharSet.Auto)> _
Shared Function GlobalSize(ByVal hMem As IntPtr) As IntPtr
End Function
<DllImport("Kernel32", CharSet:=CharSet.Auto)> _
Shared Function GlobalLock(ByVal hMem As IntPtr) As IntPtr
End Function

<DllImport("Kernel32", CharSet:=CharSet.Auto)> _
Shared Function GlobalUnlock(ByVal hMem As IntPtr) As Integer
End Function

<DllImport("Kernel32", CharSet:=CharSet.Auto)> _
Shared Function GlobalFree(ByVal hMem As IntPtr) As IntPtr
End Function

<StructLayout(LayoutKind.Sequential, Pack:=1)> _
Class BITMAPFILEHEADER
   Public bfType As UShort
   Public bfSize As UInteger
   Public bfReserved1 As UShort
   Public bfReserved2 As UShort
   Public bfOffBits As UInteger
End Class

<StructLayout(LayoutKind.Sequential, Pack:=1)> _
Class BITMAPINFOHEADER
   Public biSize As UInteger
   Public biWidth As Integer
   Public biHeight As Integer
   Public biPlanes As UShort
   Public biBitCount As UShort
   Public biCompression As UInteger
   Public biSizeImage As UInteger
   Public biXPelsPerMeter As Integer
   Public biYPelsPerMeter As Integer
   Public biClrUsed As UInteger
   Public biClrImportant As UInteger
End Class

<StructLayout(LayoutKind.Sequential, Pack:=1)> _
Class RGBQUAD
   Public rgbBlue As Byte
   Public rgbGreen As Byte
   Public rgbRed As Byte
   Public rgbReserved As Byte
End Class

      
Public Sub ChangeToDibExample()
   Dim codecs As New RasterCodecs()

   ' Load an image
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"), 24, CodecsLoadByteOrder.BgrOrGray, 1, 1)

   ' Change to DIB
   Dim hdib As IntPtr = image.ChangeToDib(RasterConvertToDibType.BitmapInfoHeader)

   ' Dispose the image since it is unusable now
   image.Dispose()

   ' Clean up
   codecs.Dispose()

   ' Save this DIB to disk as a BMP file

   Dim dibSize As Integer = GlobalSize(hdib).ToInt32()

   Dim bmfh As New BITMAPFILEHEADER()
   bmfh.bfType = &H4D42  ' "BM"
   bmfh.bfSize = CUInt(Marshal.SizeOf(GetType(BITMAPFILEHEADER)) + dibSize)
   bmfh.bfReserved1 = 0
   bmfh.bfReserved2 = 0

   Dim pdib As IntPtr = GlobalLock(hdib)

   Dim bmih As New BITMAPINFOHEADER()
   Marshal.PtrToStructure(pdib, bmih)

   bmfh.bfOffBits = CUInt(Marshal.SizeOf(GetType(BITMAPFILEHEADER)) + bmih.biSize + bmih.biClrUsed * Marshal.SizeOf(GetType(RGBQUAD)))

   Using fs As FileStream = File.Create(Path.Combine(LEAD_VARS.ImagesDir, "Image1_ToDib.bmp"))
      Dim writer As New BinaryWriter(fs)
      writer.Write(bmfh.bfType)
      writer.Write(bmfh.bfSize)
      writer.Write(bmfh.bfReserved1)
      writer.Write(bmfh.bfReserved2)
      writer.Write(bmfh.bfOffBits)

      Dim buffer(1023) As Byte
      Dim offset As Integer = 0
      While (offset < dibSize)
         Dim bytes As Integer = Math.Min(dibSize - offset, buffer.Length)
         Marshal.Copy(New IntPtr(pdib.ToInt64() + offset), buffer, 0, bytes)
         fs.Write(buffer, 0, bytes)

         offset = offset + bytes
      End While
   End Using

   GlobalUnlock(hdib)
   GlobalFree(hdib)
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;
using Leadtools.Drawing;
using Leadtools.Controls;
using Leadtools.Svg;

[DllImport("Kernel32", CharSet = CharSet.Auto)]
static extern IntPtr GlobalSize(IntPtr hMem);
[DllImport("Kernel32", CharSet = CharSet.Auto)]
static extern IntPtr GlobalLock(IntPtr hMem);

[DllImport("Kernel32", CharSet = CharSet.Auto)]
static extern int GlobalUnlock(IntPtr hMem);

[DllImport("Kernel32", CharSet = CharSet.Auto)]
static extern IntPtr GlobalFree(IntPtr hMem);

[StructLayout(LayoutKind.Sequential, Pack = 1)]
class BITMAPFILEHEADER
{
   public ushort bfType;
   public uint bfSize;
   public ushort bfReserved1;
   public ushort bfReserved2;
   public uint bfOffBits;
}

[StructLayout(LayoutKind.Sequential, Pack = 1)]
class BITMAPINFOHEADER
{
   public uint biSize;
   public int biWidth;
   public int biHeight;
   public ushort biPlanes;
   public ushort biBitCount;
   public uint biCompression;
   public uint biSizeImage;
   public int biXPelsPerMeter;
   public int biYPelsPerMeter;
   public uint biClrUsed;
   public uint biClrImportant;
}

[StructLayout(LayoutKind.Sequential, Pack = 1)]
class RGBQUAD
{
   public byte rgbBlue;
   public byte rgbGreen;
   public byte rgbRed;
   public byte rgbReserved;
}

      
public void ChangeToDibExample()
{
   RasterCodecs codecs = new RasterCodecs();

   // Load an image
   RasterImage image = codecs.Load(Path.Combine(ImagesPath.Path, "Image1.cmp"), 24, CodecsLoadByteOrder.BgrOrGray, 1, 1);

   // Change to DIB
   IntPtr hdib = image.ChangeToDib(RasterConvertToDibType.BitmapInfoHeader);

   // Dispose the image since it is unusable now
   image.Dispose();

   // Clean up
   codecs.Dispose();

   // Save this DIB to disk as a BMP file

   int dibSize = GlobalSize(hdib).ToInt32();

   BITMAPFILEHEADER bmfh = new BITMAPFILEHEADER();
   bmfh.bfType = 0x4d42; // "BM"
   bmfh.bfSize = (uint)(Marshal.SizeOf(typeof(BITMAPFILEHEADER)) + dibSize);
   bmfh.bfReserved1 = 0;
   bmfh.bfReserved2 = 0;

   IntPtr pdib = GlobalLock(hdib);

   BITMAPINFOHEADER bmih = new BITMAPINFOHEADER();
   Marshal.PtrToStructure(pdib, bmih);

   bmfh.bfOffBits = (uint)(Marshal.SizeOf(typeof(BITMAPFILEHEADER)) + bmih.biSize + bmih.biClrUsed * Marshal.SizeOf(typeof(RGBQUAD)));

   using(FileStream fs = File.Create(Path.Combine(ImagesPath.Path, "Image1_ToDib.bmp")))
   {
      BinaryWriter writer = new BinaryWriter(fs);
      writer.Write(bmfh.bfType);
      writer.Write(bmfh.bfSize);
      writer.Write(bmfh.bfReserved1);
      writer.Write(bmfh.bfReserved2);
      writer.Write(bmfh.bfOffBits);

      byte[] buffer = new byte[1024];
      int offset = 0;
      while(offset < dibSize)
      {
         int bytes = Math.Min(dibSize - offset, buffer.Length);
         Marshal.Copy(new IntPtr(pdib.ToInt64() + offset), buffer, 0, bytes);
         fs.Write(buffer, 0, bytes);

         offset += bytes;
      }
   }

   GlobalUnlock(hdib);
   GlobalFree(hdib);
}
Requirements

Target Platforms

See Also

Reference

RasterImage Class
RasterImage Members
FromDib(IntPtr) Method
FromDibArray Method
ToDibArray Method
RasterImageConverter.FromHBitmap
ToDib Method
RasterImageConverter.ToHBitmap
ChangeFromDib Method
RasterImageConverter.ChangeFromHBitmap
RasterImageConverter.ChangeToHBitmap

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