Copy an image from an URL to own server and resize it RSS

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  jl2424

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  8 Posts

  Copy an image from an URL to own server and resize it

  Apr 26, 2009 04:30 PM|LINK

  I need to do the following: I have the URL of an image file. Now I need to get that image, and copy it to a specific folder on my own server, in 4 different thumbnail versions. Can someone help me how to do that in ASP.NET/C#?
  

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  nizam133

  Contributor

  3538 Points

  638 Posts

  Re: Copy an image from an URL to own server and resize it

  Apr 26, 2009 05:15 PM|LINK

   Hi, hey here a function for you which will resize the image, and also you can specify to have thimbnail version of your image
  

  public static string ResizetheImage(string imageName, double csWidth, double csHeight, bool isThumbNail, string strType)
          {
              string newImagePath = string.Empty;
              string newImageName = string.Empty;
              string newImageURL = string.Empty;
              string strPath = string.Empty;
              string ImageURL = string.Empty;
  
  
              string name, extension;
  
  
              string strRandomCode = string.Empty;
  
  
              try
              {
  
  
                  strPath = "UserImageDirecoryPath_pleasespecify"

                  ImageURL = "ImageREADURL_You can specifythis"
                  extension = imageName.Substring(imageName.LastIndexOf(".") + 1);
  
                  if (!isThumbNail)
                  {
  

   //GenerateRandomeCode method is written in some other class, you write your own here

     strRandomCode = Utilities.GenerateRandomCode(8);
  
  
                      newImagePath = strPath + @"Temp\" + strRandomCode + "." + extension;
                      newImageURL = ImageURL + @"Temp\" + strRandomCode + "." + extension;
                  }
                  else
                  {
                      name = imageName.Substring(0, imageName.LastIndexOf("."));
  
                      newImagePath = strPath + name + strType + extension;
                      newImageURL = string.Empty;
                  }
  
                  double pictureAspectRatio = 0;
                  int newWidth = 0, newHeight = 0, centeringFactor = 0;
  
  
                  if (!File.Exists(strPath + imageName))
                      return string.Empty;
  
                  Image picture = Image.FromFile(strPath + imageName);
  
                  double csAspectRatio = csWidth / csHeight;
  
                  Rectangle rect = new Rectangle();
  
                  double pictureWidth = picture.Width;
                  double pictureHeight = picture.Height;
  
  // here 70 is the poup image width and height

                  if (strType == "POPUPImage" & pictureWidth < 70 & pictureHeight < 70)
                  {
                      newWidth = (int)pictureWidth;
                      newHeight = (int)pictureHeight;
                  }
                  else
                  {
                      pictureAspectRatio = pictureWidth / pictureHeight;
                      if (pictureAspectRatio > csAspectRatio)
                      {
                          newWidth = (int)csWidth;
                          newHeight = (int)(csWidth / pictureWidth * pictureHeight);
  
                          centeringFactor = ((int)csHeight - newHeight) / 2;
  
                          //rect = new Rectangle(0, centeringFactor, newWidth, newHeight + centeringFactor);
                          //rect = new Rectangle(0, 0, newWidth, newHeight);
                      }
                      else if (pictureAspectRatio < csAspectRatio)
                      {
                          newWidth = (int)(csHeight / pictureHeight * pictureWidth);
                          newHeight = (int)csHeight;
  
                          centeringFactor = ((int)csWidth - newWidth) / 2;
  
                          //rect = new Rectangle(centeringFactor, 0, newWidth + centeringFactor, newHeight);
                          //rect = new Rectangle(0, 0, newWidth, newHeight);
                      }
                      else
                      {
                          newWidth = (int)csWidth;
                          newHeight = (int)csHeight;
  
                          centeringFactor = ((int)csWidth - newWidth) / 2;
  
                          //rect = new Rectangle(centeringFactor, 0, newWidth + centeringFactor, newHeight);
                      }
                  }
  
                  rect = new Rectangle(0, 0, newWidth, newHeight);
  
  
  
                  Bitmap bmPhoto = new Bitmap(newWidth, newHeight, PixelFormat.Format24bppRgb);
  
                  bmPhoto.SetResolution(72, 72);
  
                  Graphics grPhoto = Graphics.FromImage(bmPhoto);
  
                  grPhoto.SmoothingMode = SmoothingMode.HighQuality;
                  grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;
                  grPhoto.PixelOffsetMode = PixelOffsetMode.HighQuality;
  
                  grPhoto.DrawImage(picture, rect, 0, 0, (int)pictureWidth, (int)pictureHeight, GraphicsUnit.Pixel);
  
                  bmPhoto.Save(newImagePath);
  
                  if (!File.Exists(newImagePath))
                      return string.Empty;
  
                  bmPhoto.Dispose();
                  grPhoto.Dispose();
                  picture.Dispose();
              }
              catch
              {
                  return string.Empty;
              }
  
              return newImageURL;
          }

  Please go through the code once , if you find any syntactical error please correct it 
  

    <input id="gwProxy" type="hidden"><input onclick="jsCall();" id="jsProxy" type="hidden"><div id="refHTML"></div>
  • Marked as answer by Gary yang - MSFT on May 04, 2009 01:33 AM
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  Gary yang - ...

  All-Star

  25901 Points

  2588 Posts

  Re: Copy an image from an URL to own server and resize it

  Apr 30, 2009 04:33 AM|LINK

  Hi jl2424,

  Based on your description, It seems that you want to finish the following functions:

  First: Download the image with Url.

  Second: Resize the image and save it into disk.

  For the first requirement, please try to solve it by using WebClient class. Please try to refer to the following code:

  private void Page_Load(object sender, System.EventArgs e)
      {
          WebClient wc = new WebClient();
          byte[] data = wc.DownloadData("http://www.google.cn/intl/en-us/images/logo_cn.gif");
          MemoryStream ms = new MemoryStream(data);
          System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
          GetThumbnailImage(img);//Resize Image
      }

   For the second requirement, please try to refer to the code below:

      private void GetThumbnailImage(System.Drawing.Image img)
      {
          float iScale = img.Height > img.Width ? (float)img.Height / 100 : (float)img.Width / 100;
          img = img.GetThumbnailImage((int)(img.Width / iScale), (int)(img.Height / iScale), null, IntPtr.Zero);
          MemoryStream memStream = new MemoryStream();
          img.Save(Server.MapPath("att.jpeg"), System.Drawing.Imaging.ImageFormat.Jpeg);
          memStream.Flush();
      }

   

  Gary yang - MSFT
  Microsoft Online Community Support
  
  Please remember to mark the replies as answers if they help and unmark them if they provide no help.
  
  • Edited by Gary yang - MSFT on Apr 30, 2009 04:34 AM
  • Marked as answer by Gary yang - MSFT on May 04, 2009 01:32 AM
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  nareshprakas...

  Participant

  1396 Points

  285 Posts

  Re: Copy an image from an URL to own server and resize it

  Apr 30, 2009 04:37 AM|LINK

  See below link. I hope it is helpful for you.

  http://dotnet-naresh.blogspot.com/

   

  Thanks
  Naresh Prakash.
  Click Here : SKY IS NOT THE LIMIT
  
  Don't forget to click "Mark as Answer" on the post that helped you.
  This credits that member, earns you a point and mark your thread as Resolved for the sake of Future Readers.
  • Marked as answer by Gary yang - MSFT on May 04, 2009 01:33 AM