Mac/Demo/example1/dnslookup-1.py

   1 """Sample program performing domain name lookups and showing off EasyDialogs,
   2 Res and Dlg in the process"""
   3
   4 import EasyDialogs
   5 import Res
   6 import Dlg
   7 import sys
   8 import socket
   9 import string
  10 #
  11 # Definitions for our resources
  12 ID_MAIN=512
  13
  14 ITEM_LOOKUP_ENTRY=1
  15 ITEM_RESULT=2
  16 ITEM_LOOKUP_BUTTON=3
  17 ITEM_QUIT_BUTTON=4
  18
  19
  20 def main():
  21     """Main routine: open resource file, call dialog handler"""
  22     try:
  23         Res.OpenResFile("dnslookup-1.rsrc")
  24     except Res.Error:
  25         EasyDialogs.Message("Cannot open dnslookup-1.rsrc")
  26         sys.exit(1)
  27     do_dialog()
  28
  29 def do_dialog():
  30     """Post dialog and handle user interaction until quit"""
  31     my_dlg = Dlg.GetNewDialog(ID_MAIN, -1)
  32     while 1:
  33         n = Dlg.ModalDialog(None)
  34         if n == ITEM_LOOKUP_BUTTON:
  35             tp, h, rect = my_dlg.GetDialogItem(ITEM_LOOKUP_ENTRY)
  36             txt = Dlg.GetDialogItemText(h)
  37
  38             tp, h, rect = my_dlg.GetDialogItem(ITEM_RESULT)
  39             Dlg.SetDialogItemText(h, dnslookup(txt))
  40         elif n == ITEM_QUIT_BUTTON:
  41             break
  42
  43 def dnslookup(str):
  44     """ Perform DNS lookup on str.  If first character of digit is numeric,
  45         assume that str contains an IP address.  Otherwise, assume that str
  46         contains a hostname."""
  47     if str == '': str = ' '
  48     if str[0] in string.digits:
  49         try:
  50             value = socket.gethostbyaddr(str)[0]
  51         except:
  52             value = 'Lookup failed'
  53     else:
  54         try:
  55             value = socket.gethostbyname(str)
  56         except:
  57             value = 'Lookup failed'
  58     return value
  59
  60 main()
  61