| Jack Jansen | 20ffa0e | 2001-12-03 00:11:35 +0000 | [diff] [blame] | 1 | |
| 2 | """mpwsystem - |
| 3 | A simple example of how to use Apple Events to implement a "system()" |
| 4 | call that invokes ToolServer on the command. |
| 5 | |
| 6 | Contributed by Daniel Brotsky <dev@brotsky.com>. |
| 7 | |
| 8 | (renamed from aesystem to mpwsystem by Jack) |
| 9 | |
| 10 | system(cmd, infile = None, outfile = None, errfile = None) |
| 11 | |
| 12 | 1. Every call to system sets "lastStatus" and "lastOutput" to the |
| 13 | status and output |
| 14 | produced by the command when executed in ToolServer. (lastParameters |
| 15 | and lastAttributes |
| 16 | are set to the values of the AppleEvent result.) |
| 17 | |
| 18 | 2. system returns lastStatus unless the command result indicates a MacOS error, |
| 19 | in which case os.Error is raised with the errnum as associated value. |
| 20 | |
| 21 | 3. You can specify ToolServer-understandable pathnames for |
| 22 | redirection of input, |
| 23 | output, and error streams. By default, input is Dev:Null, output is captured |
| 24 | and returned to the caller, diagnostics are captured and returned to |
| 25 | the caller. |
| 26 | (There's a 64K limit to how much can be captured and returned this way.)""" |
| 27 | |
| 28 | import os |
| 29 | import aetools |
| 30 | |
| 31 | try: server |
| 32 | except NameError: server = aetools.TalkTo("MPSX", 1) |
| 33 | |
| 34 | lastStatus = None |
| 35 | lastOutput = None |
| 36 | lastErrorOutput = None |
| 37 | lastScript = None |
| 38 | lastEvent = None |
| 39 | lastReply = None |
| 40 | lastParameters = None |
| 41 | lastAttributes = None |
| 42 | |
| 43 | def system(cmd, infile = None, outfile = None, errfile = None): |
| 44 | global lastStatus, lastOutput, lastErrorOutput |
| 45 | global lastScript, lastEvent, lastReply, lastParameters, lastAttributes |
| 46 | cmdline = cmd |
| 47 | if infile: cmdline += " <" + infile |
| 48 | if outfile: cmdline += " >" + outfile |
| 49 | if errfile: cmdline += " " + str(chr(179)) + errfile |
| 50 | lastScript = "set Exit 0\r" + cmdline + "\rexit {Status}" |
| 51 | lastEvent = server.newevent("misc", "dosc", {"----" : lastScript}) |
| 52 | (lastReply, lastParameters, lastAttributes) = server.sendevent(lastEvent) |
| 53 | if lastParameters.has_key('stat'): lastStatus = lastParameters['stat'] |
| 54 | else: lastStatus = None |
| 55 | if lastParameters.has_key('----'): lastOutput = lastParameters['----'] |
| 56 | else: lastOutput = None |
| 57 | if lastParameters.has_key('diag'): lastErrorOutput = lastParameters['diag'] |
| 58 | else: lastErrorOutput = None |
| 59 | if lastParameters['errn'] != 0: |
| 60 | raise os.Error, lastParameters['errn'] |
| 61 | return lastStatus |
| 62 | |
| 63 | if __name__ == '__main__': |
| 64 | sts = system('alert "Hello World"') |
| 65 | print 'system returned', sts |
| 66 | |
| 67 | |