圖片與二進制互轉

       /// <summary>

        /// Image轉二進制

        /// </summary>

        /// <param name="img">圖片</param>

        /// <returns>轉換得到的二進制</returns>

        public byte[] GetByteByImage(System.Drawing.Image img)

        {

            try

            {

                byte[] bt = null;

                if (!img.Equals(null))

                {

                    using (MemoryStream mostream = new MemoryStream())

                    {

                        Bitmap bmp = new Bitmap(img);

                        bmp.Save(mostream, System.Drawing.Imaging.ImageFormat.Bmp);//將圖像以指定的格式存入緩存內存流

                        bt = new byte[mostream.Length];

                        mostream.Position = 0;//設置留的初始位置

                        mostream.Read(bt, 0, Convert.ToInt32(bt.Length));

                    }

                }

                return bt;

            }

            catch

            {

                return null;

            }

        }

 

        /// <summary>

        /// 字節流轉換成圖片

        /// </summary>

        /// <param name="byt">要轉換的字節流</param>

        /// <returns>轉換得到的Image對象</returns>

        public static Image BytToImg(byte[] byt)

        {

            MemoryStream ms = new MemoryStream(byt);

            Image img = Image.FromStream(ms);

            return img;

        }