stringpict.py 文件源码

def terminal_width(self):
        """Return the terminal width if possible, otherwise return 0.
        """
        ncols = 0
        try:
            import curses
            import io
            try:
                curses.setupterm()
                ncols = curses.tigetnum('cols')
            except AttributeError:
                # windows curses doesn't implement setupterm or tigetnum
                # code below from
                # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440694
                from ctypes import windll, create_string_buffer
                # stdin handle is -10
                # stdout handle is -11
                # stderr handle is -12
                h = windll.kernel32.GetStdHandle(-12)
                csbi = create_string_buffer(22)
                res = windll.kernel32.GetConsoleScreenBufferInfo(h, csbi)
                if res:
                    import struct
                    (bufx, bufy, curx, cury, wattr,
                     left, top, right, bottom, maxx, maxy) = struct.unpack("hhhhHhhhhhh", csbi.raw)
                    ncols = right - left + 1
            except curses.error:
                pass
            except io.UnsupportedOperation:
                pass
        except (ImportError, TypeError):
            pass
        return ncols