objective c - Cocoa app cannot start looping python script. Works when built/run through xcode -

i'm trying use nstask start looping python script cocoa app. python script ends in app's contents/resources folder.

i path script , create nstask with:

dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{     nsstring *scriptpath = [[nsbundle mainbundle] pathforresource:filename oftype:@"py"];     nstask* task = [[nstask alloc] init];     task.launchpath = python_path;     task.arguments = [nsarray arraywithobjects:scriptpath, nil];     [task launch];     [task waituntilexit]; }); 

(i've omitted stdoutpipe stuff readability)

when build & run app xcode works expected, task holds @ waituntilexit , python script runs continuously.

when try run produced .app file gets waituntilexit, stalls awhile, , exits error. have logging in python script know no part of script run during time. script path true location of python scripts , returns same path when run xcode or .app.

i figure must have of project settings set-up incorrectly, seems handling resources correctly. idea?

update 1 running non-looping python script print statement works .app. followings non-looping script fails well:

#!/usr/bin/python       import os  def log(string):     print(string)     path = os.environ['pwd'] + '/smoke_screen_test.txt'     f1=open(path, 'a')     f1.write(string + "\n")  if __name__ == '__main__':     log("test works")     exit(0) 

maybe import statements mess up? or file creation?

the problem use of os.environ['pwd']. pwd not return local directory of script being executed. duh. solution grab path of script argv[0] , use directory of path:

path = os.path.dirname(sys.argv[0])

then pass path around needed.