图片与byte相互转换

「爱情、让人受尽委屈。」 2023-06-05 11:16 4阅读 0赞

一、图片转byte

public byte[]  ImageToByte()
            {
                string imagefile = @"http://192.168.0.212/pass/T-1.jpg";//互联网图片地址
                Image img = UrlToImage(imagefile);
                Bitmap bmp = new Bitmap(img);
                MemoryStream ms = new MemoryStream();
                bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                byte[] arr = new byte[ms.Length];
                ms.Position = 0;
                ms.Read(arr, 0, (int)ms.Length);
                ms.Close();
                var a = Convert.ToBase64String(arr);
                string strbaser64 = "";
                WebClient mywebclient = new WebClient();
                byte[] Bytes = mywebclient.DownloadData(imagefile);
                return Bytes
    
            }
            public  Image UrlToImage(string url)
            {
                WebClient mywebclient = new WebClient();
                byte[] Bytes = mywebclient.DownloadData(url);
                using (MemoryStream ms = new MemoryStream(Bytes))
                {
                    Image outputImg = Image.FromStream(ms);
                    return outputImg;
                }
            }

二、byte转图片

将byte数组保存成图片：
    
    方式一：System.IO.File.WriteAllBytes(@"c:\test.jpg", bytes);
    
    方式二：MemoryStream ms=new MemoryStream(Byte[] b);  把那个byte[]数组传进去,然后
               FileStream fs=new FileStream(路径 例如:"E:\image\1.jpg");
    　　　　ms.writeto(fs);
    　　　　ms.close();
    　　　　fs.close();
    
    方法三：
    
           //得到图片地址
           var stringFilePath = context.Server.MapPath(string.Format("~/Image/{0}{1}.jpg", imageName, id));
           //声明一个FileStream用来将图片暂时放入流中
           FileStream stream = new FileStream(stringFilePath, FileMode.Open);
           using (stream)
           {
               //透过GetImageFromStream方法将图片放入byte数组中
               byte[] imageBytes = this.GetImageFromStream(stream,context);
               //上下文确定写到客户短时的文件类型
               context.Response.ContentType = "image/jpeg";
               //上下文将imageBytes中的数据写到前段
               context.Response.BinaryWrite(imageBytes);
               stream.Close();
            }

转载于:https://www.cnblogs.com/macT/p/11606457.html