二进制与图片互相转换

图片与二进制 互相转换 图片与base64互相转换

1.图片与二进制互相转换

protected void Page_Load(object sender, EventArgs e)
        {
            //图片转二进制流
            string filepath = @"D:\netProjectTest\图片二进制互转\图片二进制互转\img\1.jpg";
            string filepath1 = @"D:\netProjectTest\图片二进制互转\图片二进制互转\ss\1.jpg";
            Bitmap bm = new Bitmap(System.Drawing.Image.FromFile(filepath));
            MemoryStream ms = new MemoryStream();
            bm.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            ms.Flush();
            byte[] by = ms.ToArray();
            StringBuilder sb = new StringBuilder();
            foreach (var item in by)
            {
                sb.Append(item.ToString());
            }

            Response.Write(sb);
            //二进制流 转换为图片
            Bitmap bt1 = new Bitmap(new MemoryStream(by, 0, by.Length, true));
            bt1.Save(filepath1, System.Drawing.Imaging.ImageFormat.Jpeg);
        }

2.图片与base64互相转换

 //图片转base64编码
            string filepath = @"D:\netProjectTest\图片二进制互转\图片二进制互转\img\1.jpg";
            string filepath1 = @"D:\netProjectTest\图片二进制互转\图片二进制互转\bb\1.jpg";

            Bitmap bt = new Bitmap(filepath);
            String strbaser64 = String.Empty;
            MemoryStream ms = new MemoryStream();
            bt.Save(ms, bt.RawFormat);
            byte[] bytes = ms.ToArray();
            ms.Close();
            strbaser64 = Convert.ToBase64String(bytes);
            string s = strbaser64;
            //base64转图片
            byte[]  base64Arr=Convert.FromBase64String(s);
            MemoryStream ms1= new MemoryStream(base64Arr);
            Bitmap bm1 = new Bitmap(ms1);
            ms1.Close();
            bm1.Save(filepath1);