Home > Uncategorized > Generating thumbnails in ASP.NET

Generating thumbnails in ASP.NET

Hi,

I found just developed a nice new function for uploading images from a website, and generating thumbnails on the fly

 public string storeFile(HttpPostedFile postedFile)
 {
   string strFilename="";
   string strPath = "c:\wherever\";
   if( postedFile.FileName != "" )
   {
 HttpPostedFile hpfFile = postedFile;
    int nFileLen = hpfFile.ContentLength;
 byte[] bData = new byte[nFileLen];
 hpfFile.InputStream.Read(bData, 0, nFileLen);
    strFilename = Path.GetFileName(hpfFile.FileName);
 FileStream fsFullImage = new FileStream(strPath + strFilename , FileMode.Create);
 fsFullImage.Write(bData, 0, bData.Length);
 fsFullImage.Close();
    System.Drawing.Image  iPhoto;
 System.Drawing.Image  iThumbnail;
    iPhoto = System.Drawing.Image.FromFile(strPath + strFilename);
   iThumbnail = iPhoto.GetThumbnailImage(100, 100, null, IntPtr.Zero);
 FileStream fsThumbnailImage = new FileStream(strPath + "tn" + strFilename , FileMode.Create);
 iThumbnail.Save(fsThumbnailImage, ImageFormat.Gif);
 fsThumbnailImage.Close();
   }
   return strFilename;
 }

This is then called in a asp.net page with

string strFilename = storeFile(Photo.PostedFile);

Where Photo is a name of a file input box such as:

<input type=file name="Photo" id="Photo" runat="server">

You also have to add the following – enctype="multipart/form-data" to your form, and ensure you have write permissions on the destination folder.

 

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