The command \logbox does \showbox without stopping the compilation.
The package's main command is \viewbox*: the box is typeset (copied) with its dimensions, and its contents are logged in the .log file.
The author is Florent Chervet. The package is Copyright © 2011 Florent Chervet.
License: lppl1.3 Version: 1.0 Catalogued: 2015-08-03