DIB to System.Bitmap

I have a DIB on the Clipboard, I need to be able to pass the Pointer for this Dataobject in order to convert it to Bitmap - how do I get the pointer to pass to your function ? How How How to get that pointer??

IDataObject _object = clipboard.GetDataObject().. _object has the DIB in it how to get a pointer to it ?

This article helped me do something I've been trying to do off and on for years; Save images from my old digital camera in bulk. Thank you very much.. Vote of 5..

thank you ,This helped me Smile | :)

This is all terrific information and it's awesome that it works. I am wondering about the suitability of including any of this in a CPOL article. Can anyone offer an opinion whether any of this work is encumbered by any licensing? I can't find any licensing association in what's been posted. So I'm assuming it's public domain. Am I wrong? Thanks.

Hi I need to send a dib image handle to a dll from my c# code. But i don't know how to create a dib handle from a bitmap.
I tried:

C#

var bmp = new Bitmap("dene.jpg");
hdib = bmp.GetHbitmap();

but it doesn't works.
I guess i have to use some gdiplus function like yours. Any help would be appreciated.
Thank you.

Hi
Thanks Brother,...
In God Protection Code and we so code Wink | ;)

Mcandovani

Hi..i try to use your example DIB to System.Bitmap[^]

but i can't find what's IntPtr pPix.....

You can help me?

I've tried your code in .NET 3.5 and it works great, but now I've loaded the class in WPF (adding a reference to System.Drawing) and it doesn't work.

method: BitmapFromDIB
line: int status = GdipCreateBitmapFromGdiDib(pDIB, pPix, out pBmp);

returns: status = 18 and pBmp = 0

Any idea what in WPF can cause this code not to work?

Thanks in advance!

BTW If I add a Windows Form to the WPF appplication and put the class inside that file, it does work (so it's an easy fix, but not a nice one).

Sorry man, I dont have any idea about WPF conflicts.

ok, thanks anyways. Also just if someone else has the same problem, a Windows Form with a Picturebox solves de problem. There's no need to load the form (now that's really weird)

SOLUTION: turned out that you have to initialize manually GDI+ in WPF.

You don't need PInvoke and native memory if you create a bitmap file in memory. A Bitmap file is a 14 byte file header plus a DIB. So you only have to create the 14 bytes and copy the Dib into a new buffer.

To get the Stream of a DrapDrop action call:

(Stream) e.Data.GetData(DataFormats.Dib)

To convert this dib stream to a bitmap use the following method (I tested the method with Firefox and IE and with dropping JPEG, PNG and GIF files):

private Bitmap CreateBitmapFromDib(Stream dib)
{
    // We create a new Bitmap File in memory.
    // This is the easiest way to convert a DIB to Bitmap.
    // No PInvoke needed.
    BinaryReader reader = new BinaryReader(dib);

    int headerSize = reader.ReadInt32();
    int pixelSize  = (int) dib.Length - headerSize;
    int fileSize   = 14 + headerSize + pixelSize;

    MemoryStream bmp = new MemoryStream(fileSize);
    BinaryWriter writer = new BinaryWriter(bmp);

    // 1. Write Bitmap File Header:			 
    writer.Write( (byte) 'B');							
    writer.Write( (byte) 'M');							
    writer.Write( fileSize);
    writer.Write( (int) 0 );						
    writer.Write( 14 + headerSize);				

    // 2. Copy the DIB 
    dib.Position = 0;
    byte[] data = new byte[(int) dib.Length];
    dib.Read( data, 0, (int) dib.Length);
    writer.Write( data, 0, (int) data.Length);

    // 3. Create a new Bitmap from our new stream:
    bmp.Position = 0;
    return new Bitmap(bmp);
}

BTW: To enable drag and drop on a PictureBox call:

((Control) pictureBox1).AllowDrop = true;

Excellent.

Finally see a simple copy and paste code to convert a DIB to Bitmap!

Excellent for drag&drop.

Thank you

thank you

Just to clarify, this code doesn't work if the bitmap contains an indexed palette. It took me ages to figure out why some images were coming out corrupted.

Anyhow, if you add these lines:

/* Get the palette size
 * The Palette size is stored as an int32 at offset 32
 * Actually stored as number of colours, so multiply by 4
 */
dib.Position = 32;
int reader = 4 * reader.ReadInt32();

// Get the palette size from the bbp if none was specified
if (paletteSize == 0) {
  /* Get the bits per pixel
   * The bits per pixel is store as an int16 at offset 14
   */
  dib.Position = 14;
  int bpp = reader.ReadInt16();

  // Only set the palette size if the bpp < 16
  if (bpp < 16)
    paletteSize = 4 * (2 << (bpp - 1));
}

Also, do this diff so that the offset includes the BMP header, DIB header & Palette

// Change the Bitmap offset to include the Palette Size
-    writer.Write( 14 + headerSize);
+    writer.Write( 14 + headerSize + paletteSize);

This has worked well for me

Edit: Missed out a set_Position, (wine took me over the Balmer Peak!)

modified on Friday, December 19, 2008 5:51 AM

Awesome! Thanks so much; palette-enabled DIB has been troubling me for quite a while...

Thanks a lot!
I modified the stuff a little bit to do the whole thing without copying (as bitmaps can get very big), and included changes from oobayly:

using System;
using System.IO;

namespace Limaki.Drawing {
    public class BitmapFromDibStream:Stream {
        Stream dib = null;
        byte[] header = null;
        public BitmapFromDibStream(Stream dib) {
            this.dib = dib;
            makeHeader();
        }
        private void makeHeader() {
            BinaryReader reader = new BinaryReader(dib);

            int headerSize = reader.ReadInt32();
            int pixelSize = (int) dib.Length - headerSize;
            int fileSize = 14 + headerSize + pixelSize;

            MemoryStream bmp = new MemoryStream(14);
            BinaryWriter writer = new BinaryWriter(bmp);



            /* Get the palette size
                   * The Palette size is stored as an int32 at offset 32
                   * Actually stored as number of colours, so multiply by 4
                   */
            dib.Position = 32;
            int paletteSize = 4 * reader.ReadInt32();

            // Get the palette size from the bbp if none was specified
            if ( paletteSize == 0 ) {
                /* Get the bits per pixel
                     * The bits per pixel is store as an int16 at offset 14
                     */
                dib.Position = 14;
                int bpp = reader.ReadInt16();

                // Only set the palette size if the bpp < 16
                if ( bpp < 16 )
                    paletteSize = 4 * ( 2 << ( bpp - 1 ) );
            }

            // 1. Write Bitmap File Header:			 
            writer.Write((byte) 'B');
            writer.Write((byte) 'M');
            writer.Write(fileSize);
            writer.Write((int) 0);
            writer.Write(14 + headerSize+paletteSize);
            header = bmp.GetBuffer();
            writer.Close();
            dib.Position = 0;
        }

        public override int Read ( byte[] buffer, int offset, int count ) {
            
            int dibCount = count;
            int dibOffset = offset - 14;
            int result = 0;
            if (_position&lt;14){
                int headerCount = Math.Min(count + (int)_position, 14);
                Array.Copy(header, _position, buffer, offset, headerCount);
                dibCount -= headerCount;
                _position += headerCount;
                result = headerCount;
            }
            if ( _position &gt;= 14 ) {
                result += dib.Read(buffer, offset + result, dibCount);
                _position = 14 + dib.Position;
            }
            return (int)result;
        }
        public override bool CanRead {
            get { return true; }
        }

        public override bool CanSeek {
            get { return false; }
        }

        public override bool CanWrite {
            get { return false; }
        }

        public override void Flush () {
                
        }

        public override long Length {
            get { return 14 + dib.Length; }
        }

        private long _position = 0;
        public override long Position {
            get { return _position; }
            set { 
                _position = value;
                if ( _position > 14 )
                    dib.Position = _position - 14;
            }
        }

        

        public override long Seek ( long offset, SeekOrigin origin ) {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void SetLength ( long value ) {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void Write ( byte[] buffer, int offset, int count ) {
            throw new Exception("The method or operation is not implemented.");
        }
    }
}

Usage:

Stream stream = dataObject.GetData(DataFormats.Dib) as Stream;
BitmapFromDibStream bmp = new BitmapFromDibStream(stream);
Image image = new Bitmap(bmp);

cheers,
lytico
limada

hello ; Thanks for the code ;
but I have intpr how can I use it in that Stream stream = dataObject.GetData(DataFormats.Dib) as Stream;
other wise what is the dataformats.dib ?
can I directly include my intpr in Stream stream = dataObject.GetData(myintpr) as Stream;??
regards...

Awesome code. Yet, simple!

how to get the pointer to DIBpixels?

modified on Tuesday, April 15, 2008 3:28 AM

Well in my case, i was getting the pointer to DIPpixel after an images is sucessfully scanned, the driver of the scanning device was creating row bitmap of the image and my application got a pointer to that memory area i.e. pointer to DIBPixel.

Hope this helps.

This could help: http://ebersysesp.blogspot.com/2009/06/como-convertir-dib-bitmap.html[^]
It's in spanish, but the code is what matters

Do you know the return values for GdipCreateBitmapFromGdiDib? I am getting a return value of "2" and can't figure out why GdipCreateBitmapFromGdiDib is not working.

According to the following article of MSDN library, the GpStatus enumeration is identical to the Status enumeration.
http://msdn2.microsoft.com/en-us/library/ms533969.aspx

For the Status enumeration, refer to the following article.
http://msdn2.microsoft.com/en-us/library/ms534175.aspx

DIB to System.Bitmap

Introduction

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