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Posted 6 Nov 2006

DIB to System.Bitmap

, 6 Nov 2006
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An article on DIB to Bitmap conversion.

Introduction

This article describes a way to retrieve an image from a DIB handle to a System.Bitmap object.

I am developing a TWAIN scanning solution for my enterprise. I have developed code for scanning an image. The only problem  was that after an image is scanned, the scanned image is available in memory in DIB format and all I am having is an IntPtr pointing to the DIB image.

My purpose is to retrieve the scanned image from the DIB handle and show it in a picture box. For that, I need to convert the DIB handle into a Bitmap object. The following code shows how I solved this problem.

Using the code

Here is a code for the function BitmapFromDIB which will return you a Bitmap object from the DIB handle.

This function accepts two parameters

  • pDIB: it is a pointer to a DIB which is returned after scanning an image
  • pPix: it is a pointer to DIBpixels

Here, we have used the function GdipCreateBitmapFromGdiDib exported from Gdiplus.dll to get a pointer to a Bitmap. We then use reflection, and pass this pointer to the static internal method Bitmap.FromGDIplus(IntPtr pGdiBitmap).

using System.Drawing; 
using System.Reflection; // . . . 

[DllImport("GdiPlus.dll", 
   CharSet=CharSet.Unicode, ExactSpelling=true)] 
private static extern int GdipCreateBitmapFromGdiDib(IntPtr pBIH, 
                          IntPtr pPix, out IntPtr pBitmap); 


public static Bitmap BitmapFromDIB(IntPtr pDIB,IntPtr pPix) 
{ 


    MethodInfo mi = typeof(Bitmap).GetMethod("FromGDIplus", 
                    BindingFlags.Static | BindingFlags.NonPublic); 

    if (mi == null) 
        return null; // (permission problem) 

    IntPtr pBmp = IntPtr.Zero; 
    int status = GdipCreateBitmapFromGdiDib(pDIB, pPix, out pBmp); 

    if ((status == 0) && (pBmp != IntPtr.Zero)) // success 
        return (Bitmap)mi.Invoke(null, new object[] {pBmp}); 

    else 
        return null; // failure 
}

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

bijulsoni
Software Developer Microsoft
United States United States
No Biography provided

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Comments and Discussions

 
GeneralRe: Great code, but doesn't work in WPF Pin
patrickveenstra8-Aug-08 8:27
memberpatrickveenstra8-Aug-08 8:27 
GeneralRe: Great code, but doesn't work in WPF Pin
bijulsoni8-Aug-08 8:44
memberbijulsoni8-Aug-08 8:44 
GeneralRe: Great code, but doesn't work in WPF Pin
patrickveenstra8-Aug-08 9:07
memberpatrickveenstra8-Aug-08 9:07 
GeneralRe: Great code, but doesn't work in WPF Pin
patrickveenstra9-Aug-08 1:50
memberpatrickveenstra9-Aug-08 1:50 
SOLUTION: turned out that you have to initialize manually GDI+ in WPF.
GeneralCreating Bitmap from DIB without PInvoke (Code inside) Pin
Renegade223-Jun-08 23:24
memberRenegade223-Jun-08 23:24 
GeneralRe: Creating Bitmap from DIB without PInvoke (Code inside) Pin
samorim4-Sep-08 15:31
membersamorim4-Sep-08 15:31 
GeneralRe: Creating Bitmap from DIB without PInvoke (Code inside) Pin
bijulsoni4-Sep-08 21:55
memberbijulsoni4-Sep-08 21:55 
GeneralRe: Creating Bitmap from DIB without PInvoke (Code inside) [modified] Pin
oobayly18-Dec-08 13:13
memberoobayly18-Dec-08 13:13 
GeneralRe: Creating Bitmap from DIB without PInvoke (Code inside) Pin
HPMV31-Jan-10 16:02
memberHPMV31-Jan-10 16:02 
GeneralRe: Creating Bitmap from DIB without PInvoke (Code inside) Pin
lytico3-Apr-09 15:56
memberlytico3-Apr-09 15:56 

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