Leadtools Namespace > RasterImage Class : ChangeToDib Method |
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) |
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 )
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) |
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.
Imports Leadtools Imports Leadtools.Codecs Imports Leadtools.ImageProcessing Imports Leadtools.ImageProcessing.Core Imports Leadtools.ImageProcessing.Color Imports Leadtools.WinForms Imports Leadtools.Dicom Imports Leadtools.Drawing <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.WinForms; using Leadtools.Dicom; using Leadtools.Drawing; [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); }