using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Web;

namespace MobilePayService
{
    public static class ImageHelper
    {
        /// <summary>
        /// Image转Base64
        /// </summary>
        /// <param name="image"></param>
        /// <returns></returns>
        public static string ImageToBase64(Image image)
        {
            MemoryStream memoryStream = new MemoryStream();
            image.Save(memoryStream, ImageFormat.Png);
            byte[] inArray = memoryStream.ToArray();
            memoryStream.Close();
            return Convert.ToBase64String(inArray);
        }

        /// <summary>
        /// Image转byte[]
        /// </summary>
        /// <param name="image"></param>
        /// <returns></returns>
        public static byte[] ImageToBytes(Image image)
        {
            ImageFormat format = image.RawFormat;
            using (MemoryStream ms = new MemoryStream())
            {
                image.Save(ms, ImageFormat.Png);
                byte[] buffer = new byte[ms.Length];
                //Image.Save()会改变MemoryStream的Position，需要重新Seek到Begin
                ms.Seek(0, SeekOrigin.Begin);
                ms.Read(buffer, 0, buffer.Length);
                return buffer;
            }
        }

        public static Image Base64ToImage(string base64String)
        {
            byte[] imageBytes = Convert.FromBase64String(base64String);
            MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);
            ms.Write(imageBytes, 0, imageBytes.Length);
            System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);
            return image;
        }

        /// <summary>
        /// Byte[]转Image
        /// </summary>
        /// <param name="buffer"></param>
        /// <returns></returns>
        public static Image BytesToImage(this byte[] buffer)
        {
            MemoryStream ms = new MemoryStream(buffer);
            Image image = Image.FromStream(ms);
            return image;
        }

        public static Bitmap GetImageFromBase64(string base64string)
        {
            byte[] b = Convert.FromBase64String(base64string);
            MemoryStream ms = new MemoryStream(b);
            Bitmap bitmap = new Bitmap(ms);
            return bitmap;
        }

    }
}