ShentunApp/Net.Framework/ImageCollection/ShenTun.ImageCollection.Common/ImageHelper.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ShenTun.ImageCollection.Common
{
    public class ImageHelper
    {
        public static string ConvertImageToBase64(Image file)
        {
            using (MemoryStream memoryStream = new MemoryStream())
            {
                file.Save(memoryStream, file.RawFormat);
                byte[] imageBytes = memoryStream.ToArray();
                return Convert.ToBase64String(imageBytes);
            }
        }

        public static Image ConvertBase64ToImage(string base64String)
        {
            byte[] imageBytes = Convert.FromBase64String(base64String);
            using (MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
            {
                ms.Write(imageBytes, 0, imageBytes.Length);
                return Image.FromStream(ms, true);
            }
        }

        public static Image GetImage(byte[] str)
        {
            MemoryStream ms = new MemoryStream(str);
            Image img = System.Drawing.Image.FromStream(ms);
            return img;
        }
        public static Image GetImage(MemoryStream mstr)
        {
            MemoryStream ms = mstr;
            Image img = System.Drawing.Image.FromStream(ms);
            return img;
        }
        public static ImageCodecInfo GetEncoder(ImageFormat format)
        {

            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();

            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.FormatID == format.Guid)
                {
                    return codec;
                }
            }
            return null;
        }

        public static  string GetLoaclPath(string path,string dirName)
        {
            DateTime dt = DateTime.Now;
            string year = dt.Year.ToString();
            string month = dt.Month.ToString();
            string day = dt.Day.ToString();
            string file_path = path + "\\" + year + "\\" + month + "\\" + day + "\\" + dirName;
            //如果日期的文件夹不存在
            if (!Directory.Exists(file_path))
            {
                //创建一个日期的文件夹
                Directory.CreateDirectory(file_path);
            }

            return file_path;
        }
    }
}