Add file watermark as it's uploaded

Question

I've been trying to add a watermark to files as they are uploaded to SharePoint. I tried using several events: ItemAdding, ItemUpdating, ItemCheckedIn.

In ItemUpdating and ItemCheckedIn the file is already in the DB. so I can add a watermark - but it's just a waste of DB read/write (The whole file is written, then I read it, then I re-save it to the db).

the ItemAdding event looks good, it does rise before the content is saved to the DB, but I do not have the content itself (SPItemEventProperties doesn't have any "content" attribute or something similar)

Answer 1

You can access the content from the ItemAdding event by using Request.Files property of the context. Try something like this :

HttpFileCollection files = HttpContext.Current.Request.Files;  
    foreach (String key in files.Keys)   
    {  
        if (collection[key].ContentLength > 0)   
        {  
           Stream stream = files[key].InputStream;  
           string filePath = files[key].FileName;  
        }  
    } 

For more info, read this post.

Answer 2

Have you tried the ItemAdded event instead? This fires after the item has finished being added to the library.