C# 返回图片的字节流byte[]

最新推荐文章于 2024-02-05 13:16:04 发布

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#C# #图片字节流

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本文介绍了一种将图片转换为字节流的方法，包括从本地文件读取和通过URL下载图片并转换的过程。该方法适用于需要在网络上传输图片或进行图片存储的应用场景。

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            /// <summary>  
            /// 返回图片的字节流byte[]  
            /// </summary>  
            /// <param name="imagePath"></param>  
            /// <param name="webClient"></param>  
            /// <returns></returns>  
            public static byte[] getImageByte(string imagePath, WebClient webClient)  
            {  
                byte[] imgByte = null;  
                try  
                {  
                    //MessageBox.Show("getImageByte");  
                    //Stopwatch stopwatch = new Stopwatch();  
                    //stopwatch.Start();  
                    //DateTime dateStart = DateTime.Now;  
      
                    if (PubFunc.UrlDiscern(imagePath))  
                    {  
                        Bitmap bt = new Bitmap(webClient.OpenRead(imagePath));  
                        imgByte = PubFunc.ImgToByte(bt);  
                    }  
                    else  
                    {  
                        using (FileStream files = new FileStream(imagePath, FileMode.Open))  
                        {  
                            imgByte = new byte[files.Length];  
                            files.Read(imgByte, 0, imgByte.Length);  
                            files.Close();  
                        }  
                    }  
                    //stopwatch.Stop();  
                    //MessageBox.Show((DateTime.Now - dateStart).TotalMilliseconds.ToString());  
      
                }  
                catch (Exception ee)  
                {  
                    MessageBox.Show(ee.ToString());  
                }  
                return imgByte;  
            }




          /// <summary>  
          /// 图片转换成字节流  
          /// </summary>  
          /// <param name="img">要转换的Image对象</param>  
          /// <returns>转换后返回的字节流</returns>  
          public static byte[] ImgToByte(Image img)  
          {  
              try  
              {  
                  using (MemoryStream ms = new MemoryStream())  
                  {  
                      byte[] imagedata = null;  
                      img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);  
                      imagedata = ms.GetBuffer();  
                      return imagedata;  
                  }  
              }  
              catch (Exception ee)  
              {  
                  MessageBox.Show(ee.ToString());  
                  return null;  
              }  
          }