Gabriel Genellina wrote: > On 17 dic, 19:21, "Roger Upole" <[EMAIL PROTECTED]> wrote: > >>>>> os.stat(selected)[ST_MODE] & (S_IXUSR|S_IXGRP|S_IXOTH >>>> This will tell you that "x.exe" is executable, even if "x.exe" contains >>>> nothing but zeros. >>> Isn't the same with any other recipe, portable or not? Unless the OS >>> actually tries to load and examine the file contents, which the OS's >>> I'm aware of, don't do. >> On windows, you can use win32file.GetBinaryType to check if a file is >> actually >> a binary executable. > > A similar function exists on Linux too. But even if a file has the > right file format, if it does not have the execute bit set, won't run. > And you could set that bit on a JPG image too - and nothing good would > happen, I presume. So one must determine first what means "the file is > executable". >
Well... sure, but that isn't the point. Here is the problem I was trying to solve: I wrote and maintain the 'twander' cross-platform file browser: http://www.tundraware.com/Software/twander/ I was working on a new release and wanted to add file associations to it. That is, if the user selected a file and double clicked or pressed Enter, I wanted the following behavior (in the following steps, "type" means nothing more than "a file whose name ends with a particular string"): 1) If an association for that file type exists, run the associated program. 2) If an association for that file type does not exist: a) If the file is not "executable", see if there is a "default" association defined and run that program if there is. b) If the file *is* "executable", run it. So ... all I really needed to know is whether or not the OS thinks the file is executable. Obvious - and this is true on most any system - you can create the situation where the file appear executable from the OS's point of view, but it is not actually. But this is a pathology that no application should really be expected to cope with... -- ---------------------------------------------------------------------------- Tim Daneliuk [EMAIL PROTECTED] PGP Key: http://www.tundraware.com/PGP/ -- http://mail.python.org/mailman/listinfo/python-list
