protected static string getThumbDisplayUrl(BaseShowThumbnailPageParameters config, string fileUrl, int displayBoxWidth, int displayBoxHeight)
{
// -- get the AppPath
string appPath = PageUtils.ApplicationPath;
// -- remove appPath
if (fileUrl.StartsWith(appPath))
{
fileUrl = fileUrl.Substring(appPath.Length);
}
if (config.useDiskCache && config.diskCacheStorageDirectoryPath != "")
{
string FullSizeImageFilenameOnDisk = config.fullSizeImageStorageDir + fileUrl;
string cacheUrl = getCachedThumbnailUrl(config, FullSizeImageFilenameOnDisk, displayBoxWidth, displayBoxHeight);
if (cacheUrl != String.Empty)
{
return(cacheUrl);
}
} // if use disk cache
string displayUrl = config.showThumbDisplayPageUrl + "?file=" + fileUrl;
if (displayBoxWidth > 0)
{
displayUrl += "&w=" + displayBoxWidth.ToString();
}
if (displayBoxHeight > 0)
{
displayUrl += "&h=" + displayBoxHeight.ToString();
}
return(displayUrl);
}
/// <summary>
/// returns String.Empty if not found in the cache.
/// </summary>
/// <param name="FullSizeImageFilenameOnDisk"></param>
/// <param name="longestSidePixels"></param>
/// <param name="shortestSidePixels"></param>
/// <returns></returns>
protected static string getCachedThumbnailUrl(BaseShowThumbnailPageParameters config, string FullSizeImageFilenameOnDisk, int displayBoxWidth, int displayBoxHeight)
{
ImageDiskCache diskCache = new ImageDiskCache(config.diskCacheStorageDirectoryPath);
string cacheKey = getImageCacheKey(FullSizeImageFilenameOnDisk, displayBoxWidth, displayBoxHeight);
string imgExtension = Path.GetExtension(FullSizeImageFilenameOnDisk);
if (diskCache.ExistsInCache(cacheKey, imgExtension))
{
string url = diskCache.CacheKeyToUrl(cacheKey, imgExtension);
return(url);
}
return(String.Empty);
}
/// <summary>
/// if width and height can not be determined, returns a new size with isEmpty = true.
/// </summary>
/// <param name="config"></param>
/// <param name="filename"></param>
/// <param name="longestSidePixels"></param>
/// <param name="shortestSidePixels"></param>
/// <returns></returns>
protected static System.Drawing.Size getDisplayWidthAndHeight(BaseShowThumbnailPageParameters config, string filename, int displayBoxWidth, int displayBoxHeight)
{
string FullSizeImageFilenameOnDisk = config.fullSizeImageStorageDir + filename;
string cacheKey = getImageCacheKey(FullSizeImageFilenameOnDisk, displayBoxWidth, displayBoxHeight);
ImageDiskCache diskCache = new ImageDiskCache(config.diskCacheStorageDirectoryPath);
if (config.useDiskCache && diskCache.ExistsInCache(cacheKey, Path.GetExtension(FullSizeImageFilenameOnDisk)))
{
string fn = diskCache.CacheKeyToFilename(cacheKey, Path.GetExtension(FullSizeImageFilenameOnDisk));
return(Thumbnail2.getDisplayWidthAndHeight(fn, displayBoxWidth, displayBoxHeight));
}
else if (File.Exists(FullSizeImageFilenameOnDisk))
{
return(Thumbnail2.getDisplayWidthAndHeight(FullSizeImageFilenameOnDisk, displayBoxWidth, displayBoxHeight));
}
else
{
return(new System.Drawing.Size());
}
}
protected void Process_Page_Load(BaseShowThumbnailPageParameters config)
{
string requestFile = PageUtils.getFromForm("file", "");
int displayBoxWidth = PageUtils.getFromForm("w", 0);
int displayBoxHeight = PageUtils.getFromForm("h", 0);
// -- get the full sized image filename on disk
string FullSizeImageFilenameOnDisk = "";
// requestFile could have the Application path in it, and the config.fullSizeImageStorageDir could also making the file impossible to find
// so let's remove it from requestFile
string appPath = Request.ApplicationPath;
if (!appPath.EndsWith("/"))
{
appPath += "/";
}
if (requestFile.StartsWith(appPath))
{
requestFile = requestFile.Substring(appPath.Length);
}
FullSizeImageFilenameOnDisk = config.fullSizeImageStorageDir + requestFile;
if (FullSizeImageFilenameOnDisk == "" || !File.Exists(FullSizeImageFilenameOnDisk))
{
return;
}
string imgExtension = Path.GetExtension(FullSizeImageFilenameOnDisk);
// -- check the cache for the image key
string cacheKey = getImageCacheKey(FullSizeImageFilenameOnDisk, displayBoxWidth, displayBoxHeight);
byte[] imageContent = null;
if (config.useMemoryCache)
{
imageContent = CheckMemoryCache(cacheKey);
}
if (imageContent == null && config.useDiskCache && config.diskCacheStorageDirectoryPath != "" && Directory.Exists(config.diskCacheStorageDirectoryPath))
{
ImageDiskCache diskCache = new ImageDiskCache(config.diskCacheStorageDirectoryPath);
imageContent = diskCache.getFromCache(cacheKey, imgExtension);
}
if (imageContent == null)
{
imageContent = Thumbnail2.CreateThumbnail(FullSizeImageFilenameOnDisk, displayBoxWidth, displayBoxHeight);
}
if (imageContent != null)
{
// -- save to cache
if (config.useMemoryCache)
{
InsertIntoMemoryCache(cacheKey, imageContent);
}
if (config.useDiskCache)
{
ImageDiskCache diskCache = new ImageDiskCache(config.diskCacheStorageDirectoryPath);
diskCache.addToCache(cacheKey, imgExtension, imageContent);
}
// -- serve the image binary data
serveImageContent(imgExtension, imageContent);
}
} // Process_Page_Load