ChangeToDibメソッド

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