如果你在 Linux 上使用 PyGTK 和 X11,你可以这样做,这是基于 Pidgin 所做的:
import ctypes
import ctypes.util
import platform
class XScreenSaverInfo(ctypes.Structure):
_fields_ = [('window', ctypes.c_long),
('state', ctypes.c_int),
('kind', ctypes.c_int),
('til_or_since', ctypes.c_ulong),
('idle', ctypes.c_ulong),
('eventMask', ctypes.c_ulong)]
class IdleXScreenSaver(object):
def __init__(self):
self.xss = self._get_library('Xss')
self.gdk = self._get_library('gdk-x11-2.0')
self.gdk.gdk_display_get_default.restype = ctypes.c_void_p
# GDK_DISPLAY_XDISPLAY expands to gdk_x11_display_get_xdisplay
self.gdk.gdk_x11_display_get_xdisplay.restype = ctypes.c_void_p
self.gdk.gdk_x11_display_get_xdisplay.argtypes = [ctypes.c_void_p]
# GDK_ROOT_WINDOW expands to gdk_x11_get_default_root_xwindow
self.gdk.gdk_x11_get_default_root_xwindow.restype = ctypes.c_void_p
self.xss.XScreenSaverAllocInfo.restype = ctypes.POINTER(XScreenSaverInfo)
self.xss.XScreenSaverQueryExtension.restype = ctypes.c_int
self.xss.XScreenSaverQueryExtension.argtypes = [ctypes.c_void_p,
ctypes.POINTER(ctypes.c_int),
ctypes.POINTER(ctypes.c_int)]
self.xss.XScreenSaverQueryInfo.restype = ctypes.c_int
self.xss.XScreenSaverQueryInfo.argtypes = [ctypes.c_void_p,
ctypes.c_void_p,
ctypes.POINTER(XScreenSaverInfo)]
# gtk_init() must have been called for this to work
import gtk
gtk # pyflakes
# has_extension = XScreenSaverQueryExtension(GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
# &event_base, &error_base);
event_base = ctypes.c_int()
error_base = ctypes.c_int()
gtk_display = self.gdk.gdk_display_get_default()
self.dpy = self.gdk.gdk_x11_display_get_xdisplay(gtk_display)
available = self.xss.XScreenSaverQueryExtension(self.dpy,
ctypes.byref(event_base),
ctypes.byref(error_base))
if available == 1:
self.xss_info = self.xss.XScreenSaverAllocInfo()
else:
self.xss_info = None
def _get_library(self, libname):
path = ctypes.util.find_library(libname)
if not path:
raise ImportError('Could not find library "%s"' % (libname, ))
lib = ctypes.cdll.LoadLibrary(path)
assert lib
return lib
def get_idle(self):
if not self.xss_info:
return 0
# XScreenSaverQueryInfo(GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
# GDK_ROOT_WINDOW(), mit_info);
drawable = self.gdk.gdk_x11_get_default_root_xwindow()
self.xss.XScreenSaverQueryInfo(self.dpy, drawable, self.xss_info)
# return (mit_info->idle) / 1000;
return self.xss_info.contents.idle / 1000
上面的例子通过 ctypes 使用 gdk 来访问特定的 X11。Xscreensaver API 也需要通过 ctypes 访问。
移植它以使用 PyGI 和自省应该很容易。