using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.IO;

namespace Stone.Common
{
    public class MyImage
    {
        /// <summary>
        /// 图片转换为byte[]
        /// </summary>
        /// <param name="Image"></param>
        /// <param name="imageFormat"></param>
        /// <returns></returns>
        public static byte[] ImageToBuffer(Image Image, System.Drawing.Imaging.ImageFormat imageFormat)
        {
            if (Image == null) { return null; }
            byte[] data = null;

            using (MemoryStream oMemoryStream = new MemoryStream())
            {
                using (Bitmap oBitmap = new Bitmap(Image))
                {
                    oBitmap.Save(oMemoryStream, imageFormat);

                    oMemoryStream.Position = 0;

                    data = new byte[oMemoryStream.Length];

                    oMemoryStream.Read(data, 0, Convert.ToInt32(oMemoryStream.Length));

                    oMemoryStream.Flush();
                }
            }

            return data;

        }

        /// <summary>
        /// byte[]转换为图片
        /// </summary>
        /// <param name="Buffer"></param>
        /// <returns></returns>
        public static Image BufferToImage(byte[] Buffer)
        {

            if (Buffer == null || Buffer.Length == 0) { return null; }
            byte[] data = null;
            Image oImage = null;
            Bitmap oBitmap = null;
            data = (byte[])Buffer.Clone();
            try
            {
                MemoryStream oMemoryStream = new MemoryStream(Buffer);
                oMemoryStream.Position = 0;

                oImage = System.Drawing.Image.FromStream(oMemoryStream);
                oBitmap = new Bitmap(oImage);
            }
            catch
            {
                throw;
            }

            return oBitmap;
        }


        /// <summary>
        /// 从文件读取图片到Image中（以非独占的方式）
        /// </summary>
        /// <param name="FileName"></param>
        /// <returns></returns>
        public static Image ReadImageFile(string FileName)
        {
            FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.Read);
            Image image = Image.FromStream(fs);
            fs.Close();

            return image;
        }
    }
}