winamp.py 文件源码

def _send_msg(self, msgId, wparam=0, lparam=0):
        """
        A util method to send a simple message to a window. Lazy init is
        supported.
        """
        for i in range(2):
            try:
                ctypes.windll.kernel32.SetLastError(0)
                result = ctypes.windll.user32.SendMessageW(
                    self.wa_hwnd, msgId, wparam, lparam)
                winerr = ctypes.GetLastError()
            except Exception:
                return None

            if winerr == 0:
                return result
            elif winerr == WinampRemote._WINERR_INVALID_WINDOW_HANDLE:
                try: # we've lost winamp, try to find it a last time
                    if self._find_winamp():
                        continue
                except:
                    pass
                return None
            return None