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  • Is it alright to call len() in a loop's conditional statement?

    - by DormoTheNord
    In C, it is considered bad practice to call strlen like this: for ( i = 0; strlen ( str ) != foo; i++ ) { // stuff } The reason, of course, is that it is inefficient since it "counts" the characters in a string multiple times. However, in Python, I see code like this quite often: for i in range ( 0, len ( list ) ): # stuff Is this bad practice? Should I store the result of len() in a variable and use that?

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  • I want the actual file name that is returned by a PHP script

    - by Aymon Fournier
    I am writing a python script that downloads a file given by a URL. Unfortuneatly the URL is in the form of a PHP script i.e. www.website.com/generatefilename.php?file=5233 If you visit the link in a browser, you are prompted to download the actual file and extension. I need to send this link to the downloader, but I can't send the downloader the PHP link. How would I get the full file name in a usable variable?

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  • How do I get the application title of a Google AppEngine app from within that app

    - by Noah McIlraith
    Under the application settings page in the Administration console, it is possible to specify a name for the application, AFAIK this is used in the login page when using the users API to login. I would like to be able to use this information within an application, currently, the title is also specified in a separate configuration file, but configuration repetition is something I would like to avoid if at all possible. Is there some way for a GAE application to determine the "Application Title"? Oh, also, I am using python.

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  • How to match a variable list of items separated by commas

    - by user261915
    I want to turn something like this CS 240, CS 246, ECE 222, ... (more or less); Software Engineering students only into ('CS 240', 'CS 246', 'ECE 222', 'ECE 220') in Python, code that matches a single course looks like >>> re.search('([A-Z]{2,5} \d{3})', 'SE 112').groups() ('SE 112',) I prefer a regular expression only method because I have a bunch of other alternate reg exps using '|' to combine them. However, a method with split is acceptable.

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  • regular expression - function body extracting

    - by Altariste
    Hi, In Python script,for every method definition in some C++ code of the form: return_value ClassName::MethodName(args) {MehodBody} ,I need to extract three parts: the class name, the method name and the method body for further processing. Finding and extracting the ClassName and MethodName is easy, but is there any simple way to extract the body of the method? With all possible '{' and '}' inside it? Or are regexes unsuitable for such task?

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  • Counting number of values between interval

    - by calccrypto
    Is there any efficient way in python to count the times an array of numbers is between certain intervals? the number of intervals i will be using may get quite large like: mylist = [4,4,1,18,2,15,6,14,2,16,2,17,12,3,12,4,15,5,17] some function(mylist, startpoints): # startpoints = [0,10,20] count values in range [0,9] count values in range [10-19] output = [9,10]

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  • regex help using repreated groups

    - by Chris H
    I'm trying to match rc-update -s output in python. m = re.match(r"^\s*(\w+)\s*\|{\s*(\w+)\s*}*$", " network | level1 level2 leveln ") but m is always None the hard part for me is getting the regex to match the n levels. I thought that using {}* would match the n levels, but as soon as I add the {} nothing matches. thanks.

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  • How to debug ctypes call of c++ dll?

    - by aF
    Hello, in my python project I call a c++ dll using ctypes library. That c++ dll consists on a wrapper dll that calls methods of a c# com interop dll. Sometimes I have a COM exception. I like to see what it corresponds exactlly but I don't know how to do it? How can I attach the c++ debugger to this situation? Thanks in advance

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  • Why there are no semicolons and {} blocks in some languages

    - by Incognito
    I know the question has no practical value, but it is interesting why in some languages semicolons and {} blocks are removed although their predecessor have them. Actually it makes me nervous to write a code in Python as there are no ";" and {}. Also in new language Google-GO semicolons are also missing although it says that lexer uses a rule to insert semicolons automatically as it scans. So is there any secret :) reason for this.

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  • How to merge multiple arrays in pairs

    - by user3688059
    I have a problem with "pairing" arrays into one (by index). Here is an example: INPUT: inputArray = [ [0, 1, 2, 3, 4], [2, 3, 5, 7, 8], [9, 6, 1] ] OUTPUT: outputArray = [ [0,2,9], [1,3,6], [2,5,1], [3,7,chooseRandom()], [4,8,chooseRandom()]] Questions: 1) How to avoid out of range problem 2) How to write chooseRandom() to choose N neighbour I'm using python but feel free to share your thoughts in any language.

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  • Cannot get variable.replace working properly.

    - by chrissygormley
    Hello, I am trying to replace a string with a new string in a python file and write the new string permanently to it. When I run the below script it removes part of the string and not all of it. The string in the file is: self.id = "027FC8EBC2D1" And the script I have to replace the string is: def edit(): o = open("test.py","r+") #open for line in open("test.py"): line = line.replace("027FC8EBC2D1","NewValue") o.write(line) o.close() edit() Thanks for any help.

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  • strange(?) module import syntax

    - by morpheous
    I've come across the following code in a Python script from pprint import pprint why not simply import pprint? Unless the module pprint contains a function called pprint which is being aliased as pprint (surely, this must be the definition of madness?)

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  • How to use Regular Expression to extract information from a HTML webpage?

    - by user569248
    How to use Regular Expression to extract the answer "Here is the answer" from a HTML webpage like this? <b>Last Question:</b> <b>Here is the answer</b> ..:: Update ::.. Thanks everybody! Here is my solution by using BeautifulSoup since I'm using Python framework: response = opener.open(url) the_page = response.read() soup = BeautifulSoup(''.join(the_page)) paraText1 = soup.body.find('div', 'div_id', text = u'Last Question:') if paraText1: answer = paraText1.next

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  • Iterating over key/value pairs in a dict sorted by keys

    - by Helper Method
    I have the following code, which just print the key/value pairs in a dict (the pairs are sorted by keys): for word, count in sorted(count_words(filename).items()): print word, count However, calling iteritems() instead of items() produces the same output for word, count in sorted(count_words(filename).iteritems()): print word, count Now, which one should I choose in this situation? I consulted the Python tutorial but it doesn't really answer my question.

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  • Convert list of dicts to string

    - by John
    I'm very new to Python, so forgive me if this is easier than it seems to me. I'm being presented with a list of dicts as follows: [{'directMember': 'true', 'memberType': 'User', 'memberId': '[email protected]'}, {'directMember': 'true', 'memberType': 'User', 'memberId': '[email protected]'}, {'directMember': 'true', 'memberType': 'User', 'memberId': '[email protected]'}] I would like to generate a simple string of memberIds, such as [email protected], [email protected], [email protected] but every method of converting a list to a string that I have tried fails because dicts are involved. Any advice?

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  • Django Deploy trouble

    - by i-Malignus
    Well, i've walking around this for a couples of days now... I think is time to ask for some help, i think my installation is ok... Server OS: Centos 5 Python -v 2.6.5 Django -v (1, 1, 1, 'final', 0) my apache conf: <VirtualHost *:80> DocumentRoot /opt/workshop ServerName taller.antell.com.py WSGIScriptAlias / /opt/workshop/workshop.wsgi WSGIDaemonProcess taller.antell.com.py user=ignacio group=ignacio processes=2 threads=25 ErrorLog /opt/workshop/apache.error.log CustomLog /opt/workshop/apache.custom.log combined <Directory "/opt/workshop"> Options +ExecCGI +FollowSymLinks -Indexes -MultiViews AllowOverride All Order allow,deny Allow from all </Directory> </VirtualHost> my mod_wsgi conf: import os import sys sys.path.append('/opt/workshop') os.environ['DJANGO_SETTINGS_MODULE'] = 'workshop.settings' os.environ['PYTHON_EGG_CACHE'] = '/tmp/.python-eggs' import django.core.handlers.wsgi application = django.core.handlers.wsgi.WSGIHandler( ) the error that i'm getting on my apache error log is: [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] mod_wsgi (pid=11459): Exception occurred processing WSGI script '/opt/workshop/workshop.wsgi'. [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] Traceback (most recent call last): [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/handlers/wsgi.py", line 241, in __call__ [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] response = self.get_response(request) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/handlers/base.py", line 134, in get_response [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return self.handle_uncaught_exception(request, resolver, exc_info) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/handlers/base.py", line 154, in handle_uncaught_exception [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return debug.technical_500_response(request, *exc_info) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/views/debug.py", line 40, in technical_500_response [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] html = reporter.get_traceback_html() [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/views/debug.py", line 114, in get_traceback_html [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return t.render(c) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/template/__init__.py", line 178, in render [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return self.nodelist.render(context) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/template/__init__.py", line 779, in render [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] bits.append(self.render_node(node, context)) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/template/debug.py", line 81, in render_node [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] raise wrapped [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] TemplateSyntaxError: Caught an exception while rendering: No module named vehicles [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] Original Traceback (most recent call last): [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/template/debug.py", line 71, in render_node [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] result = node.render(context) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/template/debug.py", line 87, in render [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] output = force_unicode(self.filter_expression.resolve(context)) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/template/__init__.py", line 572, in resolve [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] new_obj = func(obj, *arg_vals) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/template/defaultfilters.py", line 687, in date [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return format(value, arg) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/dateformat.py", line 269, in format [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return df.format(format_string) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/dateformat.py", line 30, in format [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] pieces.append(force_unicode(getattr(self, piece)())) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/dateformat.py", line 175, in r [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return self.format('D, j M Y H:i:s O') [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/dateformat.py", line 30, in format [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] pieces.append(force_unicode(getattr(self, piece)())) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/encoding.py", line 71, in force_unicode [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] s = unicode(s) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/functional.py", line 201, in __unicode_cast [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return self.__func(*self.__args, **self.__kw) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/translation/__init__.py", line 62, in ugettext [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return real_ugettext(message) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/translation/trans_real.py", line 286, in ugettext [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return do_translate(message, 'ugettext') [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/translation/trans_real.py", line 276, in do_translate [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] _default = translation(settings.LANGUAGE_CODE) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/translation/trans_real.py", line 194, in translation [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] default_translation = _fetch(settings.LANGUAGE_CODE) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/translation/trans_real.py", line 180, in _fetch [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] app = import_module(appname) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/importlib.py", line 35, in import_module [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] __import__(name) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] ImportError: No module named vehicles [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] mod_wsgi (pid=11463): Exception occurred processing WSGI script '/opt/workshop/workshop.wsgi'. [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] Traceback (most recent call last): [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/handlers/wsgi.py", line 241, in __call__ [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] response = self.get_response(request) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/handlers/base.py", line 73, in get_response [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] response = middleware_method(request) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/middleware/common.py", line 56, in process_request [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] if (not _is_valid_path(request.path_info) and [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/middleware/common.py", line 142, in _is_valid_path [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] urlresolvers.resolve(path) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/urlresolvers.py", line 303, in resolve [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] return get_resolver(urlconf).resolve(path) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/urlresolvers.py", line 218, in resolve [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] sub_match = pattern.resolve(new_path) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/urlresolvers.py", line 216, in resolve [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] for pattern in self.url_patterns: [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/urlresolvers.py", line 245, in _get_url_patterns [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/core/urlresolvers.py", line 240, in _get_urlconf_module [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] self._urlconf_module = import_module(self.urlconf_name) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] File "/opt/python2.6/lib/python2.6/site-packages/django/utils/importlib.py", line 35, in import_module [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] __import__(name) [Wed Apr 21 15:17:48 2010] [error] [client 190.128.226.122] ImportError: No module named vehicles.urls Please give my a hand, i stuck... Obviously is a problem with my vehicle module (the only one in the app), another thing is that when i try: [root@localhost workshop]# python manage.py runserver 0:8000 The app runs perfectly, i think that the problem is something near the wsgi conf, something is not clicking.... Tks... Update: workshop dir looks like... [root@localhost workshop]# ls -l total 504 -rw-r--r-- 1 root root 22706 Apr 21 15:17 apache.custom.log -rw-r--r-- 1 root root 408141 Apr 21 15:17 apache.error.log -rw-r--r-- 1 root root 0 Apr 17 10:56 __init__.py -rw-r--r-- 1 root root 124 Apr 21 11:09 __init__.pyc -rw-r--r-- 1 root root 542 Apr 17 10:56 manage.py -rw-r--r-- 1 root root 3326 Apr 17 10:56 settings.py -rw-r--r-- 1 root root 2522 Apr 21 11:09 settings.pyc drw-r--r-- 4 root root 4096 Apr 17 10:56 templates -rw-r--r-- 1 root root 381 Apr 21 13:42 urls.py -rw-r--r-- 1 root root 398 Apr 21 13:00 urls.pyc drw-r--r-- 2 root root 4096 Apr 21 13:44 vehicles -rw-r--r-- 1 root root 38912 Apr 17 10:56 workshop.db -rw-r--r-- 1 root root 263 Apr 21 15:30 workshop.wsgi vehicles dir [root@localhost vehicles]# ls -l total 52 -rw-r--r-- 1 root root 390 Apr 17 10:56 admin.py -rw-r--r-- 1 root root 967 Apr 21 13:00 admin.pyc -rw-r--r-- 1 root root 732 Apr 17 10:56 forms.py -rw-r--r-- 1 root root 2086 Apr 21 13:00 forms.pyc -rw-r--r-- 1 root root 0 Apr 17 10:56 __init__.py -rw-r--r-- 1 root root 133 Apr 21 11:36 __init__.pyc -rw-r--r-- 1 root root 936 Apr 17 10:56 models.py -rw-r--r-- 1 root root 1827 Apr 21 11:36 models.pyc -rw-r--r-- 1 root root 514 Apr 17 10:56 tests.py -rw-r--r-- 1 root root 989 Apr 21 13:44 tests.pyc -rw-r--r-- 1 root root 1035 Apr 17 10:56 urls.py -rw-r--r-- 1 root root 1935 Apr 21 13:00 urls.pyc -rw-r--r-- 1 root root 3164 Apr 17 10:56 views.py -rw-r--r-- 1 root root 4081 Apr 21 13:00 views.pyc Update 2: this is my settings.py # Django settings for workshop project. DEBUG = True TEMPLATE_DEBUG = DEBUG ADMINS = ( ('Ignacio Rojas', '[email protected]'), ('Fabian Biedermann', '[email protected]'), ) MANAGERS = ADMINS DATABASE_ENGINE = 'sqlite3' DATABASE_NAME = '/opt/workshop/workshop.db' DATABASE_USER = '' DATABASE_PASSWORD = '' DATABASE_HOST = '' DATABASE_PORT = '' # Local time zone for this installation. Choices can be found here: # http://en.wikipedia.org/wiki/List_of_tz_zones_by_name # although not all choices may be available on all operating systems. # If running in a Windows environment this must be set to the same as your # system time zone. TIME_ZONE = 'America/Asuncion' # Language code for this installation. All choices can be found here: # http://www.i18nguy.com/unicode/language-identifiers.html LANGUAGE_CODE = 'es-py' SITE_ID = 1 # If you set this to False, Django will make some optimizations so as not # to load the internationalization machinery. USE_I18N = True # Absolute path to the directory that holds media. # Example: "/home/media/media.lawrence.com/" MEDIA_ROOT = '' # URL that handles the media served from MEDIA_ROOT. Make sure to use a # trailing slash if there is a path component (optional in other cases). # Examples: "http://media.lawrence.com", "http://example.com/media/" MEDIA_URL = '' # URL prefix for admin media -- CSS, JavaScript and images. Make sure to use a # trailing slash. # Examples: "http://foo.com/media/", "/media/". ADMIN_MEDIA_PREFIX = '/media/' # Make this unique, and don't share it with anybody. SECRET_KEY = '11y0_jb=+b4^nq@2-fo#g$-ihk5*v&d5-8hg_y0i@*9$w8jalp' MIDDLEWARE_CLASSES = ( 'django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', ) ROOT_URLCONF = 'workshop.urls' TEMPLATE_DIRS = ( # Put strings here, like "/home/html/django_templates" or "C:/www/django/templates". # Always use forward slashes, even on Windows. # Don't forget to use absolute paths, not relative paths. "/opt/workshop/templates" ) INSTALLED_APPS = ( 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'workshop.vehicles', ) TEMPLATE_CONTEXT_PROCESSORS = ( 'django.core.context_processors.auth', 'django.core.context_processors.debug', 'django.core.context_processors.i18n', 'django.core.context_processors.media', )

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  • cannot receive UDP broadcast packets

    - by user292792
    Hello I have 2 boxes: - an embedded device (ARM Omap with linux) which I'll call "Omap". - a PC (can either be Windows or linux). Scenario 1 Both boxes are in the same network (example: my office). The Omap gets its address from a DHCP server (ex: 192.168.10.110). The PC has always the same address (ex. 192.168.10.104). I can successfully exchange UDP broadcast packets on any port. Success. Scenario 2 The 2 boxes are in a network withOUT a DHCP server. The PC has a static IP address (example: 10.10.10.20). The Omap boots, looks for a DHCP server, doesn't find it, and is in what I call "bad IP address" state. Now... Broadcasting UDP packets from the Omap works: the PC can see them. The opposite doesn't work: UDP packets broadcasted by the PC are not seen by the Omap. I am using Wireshark on another PC to verify that the packets are being sent. Failure. I tried to change the Omap ip address (with ifconfig)... no luck. What am I missing? To complete the picture, when the Omap is in Scenario 2, if I run udhcpc ... it can communicate with the DHCP server and get an IP address. I also see the packets with Wireshark. So this means that the DHCP client is able to broadcast UDP packets. (Yes, I tried to use DHCP ports 67/68 but it doesn't work). I am using Boost C++ Asio UDP sockets. Specifically, I took the multicast examples and changed them to do broadcasting. Any help is appreciated. Thanks, Benedetto

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  • Instantiating class with custom allocator in shared memory

    - by recipriversexclusion
    I'm pulling my hair due to the following problem: I am following the example given in boost.interprocess documentation to instantiate a fixed-size ring buffer buffer class that I wrote in shared memory. The skeleton constructor for my class is: template<typename ItemType, class Allocator > SharedMemoryBuffer<ItemType, Allocator>::SharedMemoryBuffer( unsigned long capacity ){ m_capacity = capacity; // Create the buffer nodes. m_start_ptr = this->allocator->allocate(); // allocate first buffer node BufferNode* ptr = m_start_ptr; for( int i = 0 ; i < this->capacity()-1; i++ ) { BufferNode* p = this->allocator->allocate(); // allocate a buffer node } } My first question: Does this sort of allocation guarantee that the buffer nodes are allocated in contiguous memory locations, i.e. when I try to access the n'th node from address m_start_ptr + n*sizeof(BufferNode) in my Read() method would it work? If not, what's a better way to keep the nodes, creating a linked list? My test harness is the following: // Define an STL compatible allocator of ints that allocates from the managed_shared_memory. // This allocator will allow placing containers in the segment typedef allocator<int, managed_shared_memory::segment_manager> ShmemAllocator; //Alias a vector that uses the previous STL-like allocator so that allocates //its values from the segment typedef SharedMemoryBuffer<int, ShmemAllocator> MyBuf; int main(int argc, char *argv[]) { shared_memory_object::remove("MySharedMemory"); //Create a new segment with given name and size managed_shared_memory segment(create_only, "MySharedMemory", 65536); //Initialize shared memory STL-compatible allocator const ShmemAllocator alloc_inst (segment.get_segment_manager()); //Construct a buffer named "MyBuffer" in shared memory with argument alloc_inst MyBuf *pBuf = segment.construct<MyBuf>("MyBuffer")(100, alloc_inst); } This gives me all kinds of compilation errors related to templates for the last statement. What am I doing wrong?

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