protected void Page_Load(object sender, EventArgs e)
{
// Get physical path from url
string physicalImagePath = Request.QueryString["path"];
// Get display moden
DisplayModes mode = DisplayModes.Thumbnail;
if (Request.QueryString["mode"] != null && Request.QueryString["mode"].Trim().ToUpper() == "FULL")
{
mode = DisplayModes.Full;
}
// Check path
if (physicalImagePath == null || physicalImagePath.Length == 0 || !File.Exists(physicalImagePath))
{
// If can not get the path or get a empty path or get a wrong path, then do noting
return;
}
if (mode != DisplayModes.Full && Holder.ContainsPhysicalImagePath(physicalImagePath))
{
try
{
using (MemoryStream imageStream = new MemoryStream())
{
// Set thumbnail quality
EncoderParameters encoderPara = new EncoderParameters(1);
encoderPara.Param[0] = new EncoderParameter(Encoder.Quality, Convert.ToInt64(Consts.ThumbnailImageQuality));
ImageCodecInfo imageCodecInfo = this.GetEncoderInfo(Consts.ThumbnailImageMimeType);
// Put image to the temp space with jpg format
Holder.GetImageByPhysicalImagePath(physicalImagePath).Save(imageStream, imageCodecInfo, encoderPara);
// Clear the reponse buffer
Response.Clear();
// Set the http stream as a jpg file
Response.ContentType = Consts.ThumbnailImageMimeType;
// Put the image stream to the http stream from temp space from Holder
imageStream.WriteTo(Response.OutputStream);
}
return;
}
catch (Exception ex_)
{
// do nothing
;
}
}
// Temp space for the image file
using (MemoryStream imageStream = new MemoryStream())
{
try
{
// Load image file from physical disk
System.Drawing.Image image = System.Drawing.Image.FromFile(physicalImagePath);
if (mode == DisplayModes.Full)
{
using (FileStream fs = new FileStream(physicalImagePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, Convert.ToInt32(fs.Length));
// Clear the reponse buffer
Response.Clear();
// Set the http stream as a jpg file
Response.ContentType = Consts.ThumbnailImageMimeType;
// Put the image stream to the http stream from temp space
Response.BinaryWrite(buffer);
}
}
else
{
using (Stream bmpImage = new MemoryStream())
{
if (!Consts.UseExifThumbnailImage)
{
// Reload image as BitMap format
// The JPG file which with EXIF format maybe include a ThumbnailImage
image.Save(bmpImage, ImageFormat.Bmp);
image = System.Drawing.Image.FromStream(bmpImage);
}
//init thumbnail object
System.Drawing.Image imageThumbnail = null;
// Get the thumbnail image
imageThumbnail = image.GetThumbnailImage(Consts.ThumbnailImageWidth,
Convert.ToInt32((Convert.ToDouble(Consts.ThumbnailImageWidth) / image.Width) * image.Height),
new System.Drawing.Image.GetThumbnailImageAbort(ReturnFalse),
IntPtr.Zero);
// Save to Holder
Holder.AddImage(physicalImagePath, imageThumbnail);
// Set thumbnail quality
EncoderParameters encoderPara = new EncoderParameters(1);
encoderPara.Param[0] = new EncoderParameter(Encoder.Quality, Convert.ToInt64(Consts.ThumbnailImageQuality));
ImageCodecInfo imageCodecInfo = this.GetEncoderInfo(Consts.ThumbnailImageMimeType);
// Put image to the temp space with jpg format
imageThumbnail.Save(imageStream, imageCodecInfo, encoderPara);
// Clear the reponse buffer
Response.Clear();
// Set the http stream as a jpg file
Response.ContentType = Consts.ThumbnailImageMimeType;
// Put the image stream to the http stream from temp space
imageStream.WriteTo(Response.OutputStream);
}
}
}
catch (Exception ex)
{
System.Console.WriteLine(ex.StackTrace);
// If any exception be throwed, then do nothing
return;
}
}
}