[StructLayout(LayoutKind.Sequential, Pack = 1)]
             struct BITMAPFILEHEADER
             {
                 public ushort bfType;
                 public uint bfSize;
                 public ushort bfReserved1;
                 public ushort bfReserved2;
                 public uint bfOffBits;
             }
             [StructLayout(LayoutKind.Sequential, Pack = 1)]
             struct 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;
                 public const int BI_RGB = 0;
             }
             const uint DIB_RGB_COLORS = 0;
             const uint DIB_PAL_COLORS = 1;  
            /**//// <summary>
            /// 对象转换
            /// </summary>
            /// <param name="pBITMAPINFOHEADER"></param>
            /// <returns></returns>
                   public static Bitmap ToBitmap(IntPtr pBITMAPINFOHEADER)
                   {
                       unsafe
                       {
                           BITMAPINFOHEADER* pbmi = (BITMAPINFOHEADER*)pBITMAPINFOHEADER;
                           BITMAPFILEHEADER pbmfi;
                           pbmfi.bfType = (int)'M' << 8 | (int)'B';
                           pbmfi.bfOffBits = (uint)(sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER));
                           pbmfi.bfSize = pbmfi.bfOffBits + pbmi->biSizeImage;

                           MemoryStream stream = new MemoryStream();
                           BinaryWriter bw = new BinaryWriter(stream);
                           byte[] data = new byte[sizeof(BITMAPFILEHEADER)];
                           Marshal.Copy((IntPtr)(&pbmfi), data, 0, data.Length);
                           bw.Write(data);

                           data = new byte[sizeof(BITMAPINFOHEADER)];
                           Marshal.Copy(pBITMAPINFOHEADER, data, 0, data.Length);
                           bw.Write(data);

                           data = new byte[pbmi->biSizeImage];
                           ++pbmi;
                           Marshal.Copy((IntPtr)pbmi, data, 0, data.Length);
                           bw.Write(data);
                           bw.Flush();
                           bw.BaseStream.Position = 0;

                           return new Bitmap(bw.BaseStream);
                       }
                   }





能加一个注释最好不过，谢谢