Forums

Not answered Extending Library Module with thumbnail support for tif, bmp, ...

Mat

Posted on Mar 8, 2010 (permalink)

The library module (custom library) supports all file types but not the corresponding thumbnail.

The problem is that the original uploaded file should not be changed, so it can be downloaded in its original type. For the purpose of a better overview a thumbnail should be available in all Controls (admin and public).

Now I’m thinking of creating a custom handler for thumbnail generation, than overwrite a method in the controls (like LibraryListView, LibraryItemPreview, etc.) to set the new image url. Which method would that be?
Could that functionality be achieved that way?
Or is there a way to automatically generate and save a thumbnail to an uploaded file without converting the original file? So that way I wouldn't have to modify the controls.

Thanks,
Mat

Reply

Mat

Posted on Mar 9, 2010 (permalink)

Hi Ivan,
Thanks for the quick response.

I created a custom provider MyLibraries and overwrote SaveContent as following.

if (content.Thumbnails.Count == 0)

       {

           //Custom Helper

           ImageHelper img = new ImageHelper((byte[])content.Content, ImageFormat.Jpeg);

           byte[] b = img.GetThumbnail();



           Telerik.Cms.Engine.IThumbnail it = this.AddThumbnail(content, b, "image/jpeg", ".jpg", "16640015", true);

           this.SaveThumbnail(it);

       }

       base.SaveContent(content);

(I know the name of the file in AddThumbnail is hard coded)

Now in the list (LibraryListView) the thumbnail still doesn’t show. When I manually request the url “…/MyLibraries/LibraryName/16640015.tmb.ashx?width=70&height=70&decreaseOnly=true” the thumbnail still returns as tif image although it was saved as jpg.

What am I missing?
Is it even possible that way?

Thanks,
Mat

Reply