C# Definition:

[StructLayout(LayoutKind.Sequential)]
public struct BITMAPINFOHEADER
{
    public uint  biSize;
    public int   biWidth;
    public int   biHeight;
    public ushort   biPlanes;
    public ushort   biBitCount;
    public BitmapCompressionMode  biCompression;
    public uint  biSizeImage;
    public int   biXPelsPerMeter;
    public int   biYPelsPerMeter;
    public uint  biClrUsed;
    public uint  biClrImportant;
using System;
using System.Runtime.InteropServices;

    public void Init()
    {
        biSize = (uint)Marshal.SizeOf(this);
    }
/// <summary>
/// The BITMAP structure defines the type, width, height, color format, and bit values of a bitmap.
/// </summary>
[Serializable]
[StructLayout(LayoutKind.Sequential)]
public struct BITMAP
{
     /// <summary>
     /// The bitmap type. This member must be zero.
     /// </summary>
     int bmType;

     /// <summary>
     /// The width, in pixels, of the bitmap. The width must be greater than zero.
     /// </summary>
     int bmWidth;

     /// <summary>
     /// The height, in pixels, of the bitmap. The height must be greater than zero.
     /// </summary>
     int bmHeight;

     /// <summary>
     /// The number of bytes in each scan line. This value must be divisible by 2, because the system assumes that the bit
     /// values of a bitmap form an array that is word aligned.
     /// </summary>
     int bmWidthBytes;

     /// <summary>
     /// The count of color planes.
     /// </summary>
     int bmPlanes;

     /// <summary>
     /// The number of bits required to indicate the color of a pixel.
     /// </summary>
     int bmBitsPixel;

     /// <summary>
     /// A pointer to the location of the bit values for the bitmap. The bmBits member must be a pointer to an array of
     /// character (1-byte) values.
     /// </summary>
     IntPtr bmBits;
}

VB Definition:

Public Structure BITMAPINFOHEADER
     Public biSize As Int32
     Public biWidth As Int32
     Public biHeight As Int32
     Public biPlanes As Int16
     Public biBitCount As Int16
     Public biCompression As BitmapCompressionMode
     Public biSizeImage As Int32
     Public biXPelsperMeter As Int32
     Public biYPelsPerMeter As Int32
     Public biClrUsed As Int32
     Public biClrImportant As Int32
End Structure

User-Defined Field Types:

BitmapCompressionMode

None.

Notes:

The unmanaged size of the structure must be set before the structure can be used by the API. This can be done by using the Init() call which uses the Marshal.SizeOf(this) method to get the appropriate size.

(Thanks to Mike I for the VB.NET definition).

None.

http://msdn.microsoft.com/en-us/library/dd183376

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