Quoting Stefano Rosellini <s.rosellini at iv-srl.it>: > How can make a preprocess in my Qt program to distinguish 64 bit vs 32? Hi Are you looking for something to tell if the code is 64bit or not? Some of the Q_OS macros will tell you this (e.g., for Windows or Mac). Otherwise something like 8 == sizeof(void*) A+ Paul -- Paul Floyd http://paulf.free.fr