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1. aproka
   Member

   Hello,

   Is there any way that a queued picture can be detected from js?
   I think it would need a js api, but do you have anything in mind?

   thanks,

   Aron

   Posted 3 years ago #

2. admin
   Key Master

   Hi aproka,
   at the moment there is no way to detect the status of a picture, if it is in qeued mode or already served. Nice idea, though - we will consider it in the next version :)

   Posted 3 years ago #

3. sickdm
   Member

   Can you guys serve a header that's like X-Thumbalizr: Queued when you serve a queued image?

   Posted 2 years ago #

4. admin
   Key Master

   We will enhance the headers in beta-stage.

   Posted 2 years ago #

5. steve
   Member

   Hi, I created a little PHP function to check if the thumbnail has been created and is no longer showing the temporary thumbnail.

   
function isNewThumb($url)
{
$thumbalizrImageCRC = 1342048557;
$fp = fopen($url,"rb");
$tcheck = fread($fp,1024);
fclose($fp);
$tCRC=0;
if ($tcheck)
$tCRC = crc32($tcheck);
return !($tCRC == $thumbalizrImageCRC);
}


   Ok, I know this is tricky if the temporary thumbnail image changes, but for now it helps. And in if the temp thumb changes anyway, you only have to recalculate the CRC. The CRC is calculated by using the first 1024 bytes of the file.

   Thanks for this great service, keep up to good work !

   Posted 2 years ago #

6. alainravet
   Member

   Here is the Ruby version (add more crc values for other resolutions):

     require 'open-uri'
     require 'zlib'
     include Zlib
   
     def queued_image?(path, size)
       file_crc32 = crc32(open(path).read)
       case size
         when 100  then  1699002568 == file_crc32
         when 120  then  1958777770 == file_crc32
         when 200  then  2340983175 == file_crc32
         when 150  then  3582175601 == file_crc32
         else false
       end
     end
   

   Posted 2 years ago #

7. oemberton
   Member

   We've been doing similar things in PHP but lately the CRC's appear not to work (we suspect they may have changed).

   Or it's possible that the file being downloaded isn't complete - i.e. we catch it mid-write - we're not sure.

   Posted 2 years ago #

8. charlene
   Member

   This is a really good read for me.

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   Posted 1 month ago #

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