Python可跨平台实现获取按键的方法

Zahirah ·

更新时间:2024-11-13

· 790 次阅读

本文实例讲述了Python可跨平台实现获取按键的方法。分享给大家供大家参考。具体如下：

代码如下:class _Getch:
    """Gets a single character from standard input. Does not echo to the screen."""
    def __init__(self):
        try:
            self.impl = _GetchWindows()
        except ImportError:
            try:
                self.impl = _GetchMacCarbon()
            except AttributeError:
                self.impl = _GetchUnix()
    def __call__(self): return self.impl()
class _GetchUnix:
    def __init__(self):
        import tty, sys, termios # import termios now or else you'll get the Unix version on the Mac
    def __call__(self):
        import sys, tty, termios
        fd = sys.stdin.fileno()
        old_settings = termios.tcgetattr(fd)
        try:
            tty.setraw(sys.stdin.fileno())
            ch = sys.stdin.read(1)
        finally:
            termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
        return ch
class _GetchWindows:
    def __init__(self):
        import msvcrt
    def __call__(self):
        import msvcrt
        return msvcrt.getch()
class _GetchMacCarbon:
    """
    A function which returns the current ASCII key that is down;
    if no ASCII key is down, the null string is returned. The
    page http://www.mactech.com/macintosh-c/chap02-1.html was
    very helpful in figuring out how to do this.
    """
    def __init__(self):
        import Carbon
        Carbon.Evt #see if it has this (in Unix, it doesn't)
    def __call__(self):
        import Carbon
        if Carbon.Evt.EventAvail(0x0008)[0]==0: # 0x0008 is the keyDownMask
            return ''
        else:
            #
            # The event contains the following info:
            # (what,msg,when,where,mod)=Carbon.Evt.GetNextEvent(0x0008)[1]
            #
            # The message (msg) contains the ASCII char which is
            # extracted with the 0x000000FF charCodeMask; this
            # number is converted to an ASCII character with chr() and
            # returned
            #
            (what,msg,when,where,mod)=Carbon.Evt.GetNextEvent(0x0008)[1]
            return chr(msg & 0x000000FF)
if __name__ == '__main__': # a little test
   print 'Press a key'
   inkey = _Getch()
   import sys
   for i in xrange(sys.maxint):
      k=inkey()
      if k<>'':break
   print 'you pressed ',k

希望本文所述对大家的Python程序设计有所帮助。

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跨平台方法 Python

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