public ActionResult GalleryGetDocumentThumbnail(string doc)
{
const int THUMBNAIL_WIDTH = 120;
const int THUMBNAIL_HEIGHT = 100;
Color thumbnailBackgroundColor = Color.Transparent;
if (doc != null)
{
string docPath = MvcApplication.GetDocumentsDirectory() + "\\" + HttpUtility.UrlDecode(doc);
string thumbPath = string.Empty;
//thumbPath = MvcApplication.GetCacheDirectory() + "\\" + "DOCX.thumb";
GdPicture14.DocumentFormat documentFormat = new GdPicture14.DocumentFormat();
switch (Path.GetExtension(doc).ToUpper())
{
case ".PDF":
thumbPath = MvcApplication.GetCacheDirectory() + "\\" + "PDF.thumb";
break;
case ".JPEG":
thumbPath = MvcApplication.GetCacheDirectory() + "\\" + "JPEG.thumb";
break;
case ".DOCX":
thumbPath = MvcApplication.GetCacheDirectory() + "\\" + "DOCX.thumb";
break;
case ".XLSX":
thumbPath = MvcApplication.GetCacheDirectory() + "\\" + "XLSX.thumb";
break;
default:
thumbPath = MvcApplication.GetCacheDirectory() + "\\" + "PDF.thumb";
break;
}
if (System.IO.File.Exists(thumbPath))
{
byte[] content = null;
// getting thumbnail from cache
try
{
using (FileStream fileStream = new FileStream(thumbPath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
content = new byte[fileStream.Length];
fileStream.Read(content, 0, (int)fileStream.Length); // safe cast as thumbnail size will never exceed int.maxValue
}
}
catch // can fail during first concurrent accesses.
{
goto gen_thumb;
}
return(File(content, "image/png"));
}
gen_thumb:
// GdPicture14.DocumentFormat documentFormat = GdPicture14.DocumentFormat.DocumentFormatUNKNOWN;
// GdPicture14.DocumentFormat documentFormat = GdPicture14.DocumentFormat.DocumentFormatDOCX;// h.GetExtension(doc);
int thumbnailId = 0;
int pageCount = 0;
GdPictureStatus status = GdPictureDocumentUtilities.GetDocumentPreview(docPath, THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT, thumbnailBackgroundColor.ToArgb(), ref documentFormat, ref thumbnailId, ref pageCount);
if (status == GdPictureStatus.OK)
{
using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
using (MemoryStream memoryStream = new MemoryStream())
{
try
{
if (gdpictureImaging.SaveAsStream(thumbnailId, memoryStream, GdPicture14.DocumentFormat.DocumentFormatTXT, 6) == GdPictureStatus.OK)
{
byte[] content = memoryStream.ToArray();
// let's cache result
using (FileStream fileStream = new FileStream(thumbPath, FileMode.CreateNew, FileAccess.Write, FileShare.None))
{
fileStream.Write(content, 0, content.Length);
}
}
}
finally
{
GdPictureDocumentUtilities.DisposeImage(thumbnailId);
}
}
}
}
}
return(null);
}