Python win32api 模块，DuplicateHandle() 实例源码

def DuplicateHandle(handle):
  """Duplicates a win32 handle."""
  proc = win32api.GetCurrentProcess()
  return win32api.DuplicateHandle(proc,handle,proc,0,0,win32con.DUPLICATE_SAME_ACCESS)

def MakePrivateHandle(handle, replace = 1):
  """Turn an inherited handle into a non inherited one. This avoids the
  handle duplication that occurs on CreateProcess calls which can create
  uncloseable pipes."""

  ### Could change implementation to use SetHandleInformation()...

  flags = win32con.DUPLICATE_SAME_ACCESS
  proc = win32api.GetCurrentProcess()
  if replace: flags = flags | win32con.DUPLICATE_CLOSE_SOURCE
  newhandle = win32api.DuplicateHandle(proc,handle,proc,0,0,flags)
  if replace: handle.Detach() # handle was already deleted by the last call
  return newhandle

def MakeInheritedHandle(handle, replace = 1):
  """Turn a private handle into an inherited one."""

  ### Could change implementation to use SetHandleInformation()...

  flags = win32con.DUPLICATE_SAME_ACCESS
  proc = win32api.GetCurrentProcess()
  if replace: flags = flags | win32con.DUPLICATE_CLOSE_SOURCE
  newhandle = win32api.DuplicateHandle(proc,handle,proc,0,1,flags)
  if replace: handle.Detach() # handle was deleted by the last call
  return newhandle

def __init__(self, dParams):
        PlatformBase.__init__(self, dParams)

        #
        # Since the code runs on all platforms, we have to do a lot of
        # importing here instead of at the top of the file where it's normally located.
        #
        from win32com import universal
        from win32com.client import gencache, DispatchBaseClass
        from win32com.client import constants, getevents
        import win32com
        import pythoncom
        import win32api
        import winerror
        from win32con import DUPLICATE_SAME_ACCESS
        from win32api import GetCurrentThread, GetCurrentThreadId, DuplicateHandle, GetCurrentProcess
        import threading

        self.winerror = winerror

        pid = GetCurrentProcess()
        self.tid = GetCurrentThreadId()
        handle = DuplicateHandle(pid, GetCurrentThread(), pid, 0, 0, DUPLICATE_SAME_ACCESS)
        self.handles = []
        self.handles.append(handle)

        # Hack the COM dispatcher base class so we can modify method and
        # attribute names to match those in xpcom.
        if _g_dCOMForward['setattr'] is None:
            _g_dCOMForward['getattr'] = DispatchBaseClass.__dict__['__getattr__']
            _g_dCOMForward['setattr'] = DispatchBaseClass.__dict__['__setattr__']
            setattr(DispatchBaseClass, '__getattr__', _CustomGetAttr)
            setattr(DispatchBaseClass, '__setattr__', _CustomSetAttr)

        # Hack the exception base class so the users doesn't need to check for
        # XPCOM or COM and do different things.
        ## @todo

        #
        # Make sure the gencache is correct (we don't quite follow the COM
        # versioning rules).
        #
        self.flushGenPyCache(win32com.client.gencache)
        win32com.client.gencache.EnsureDispatch('VirtualBox.Session')
        win32com.client.gencache.EnsureDispatch('VirtualBox.VirtualBox')

        self.oIntCv = threading.Condition()
        self.fInterrupted = False

        _ = dParams