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• Is there an easy way in Python to wait until certain condition is true?

  - by Checkers

  I need to wait in a script until a certain number of conditions become true? I know I can roll my own eventing using condition variables and friends, but I don't want to go through all the trouble of implementing it, since some object property changes come from external thread in a wrapped C++ library (Boost.Python), so I can't just hijack __setattr__ in a class and put a condition variable there, which leaves me with either trying to create and signal a Python condition variable from C++, or wrap a native one and wait on it in Python, both of which sound fiddly, needlessly complicated and boring. Is there an easier way to do it, barring continuous polling of the condition? Ideally it would be along the lines of res = wait_until(lambda: some_predicate, timeout) if (not res): print 'timed out'

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• How to implement dual communication between server and client via http

  - by Alex Sebastiano

  I have a AJAX client which must receive messages from server. Some messages from server not like request-response type. For example, imaging game in which players can enter. Server must send to client info about player entering. But how can server send message to client via http without request from client? Only decision that i can invent: client send request to server (getNewPlayerEnter request) with big timeout, server checks state of player set, if in set new players are, then server send info to client, if not server 'sleeps' on some time, and after 'sleeping' server checks players set again. I think my desicion a little stupid(maybe not little). How implement it right? p.s. sorry for my english

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• How do I can linux flock command to prevent another root process deleting a file?

  - by Danmaxis

  Hello there, I would like to prevent one of my root process from deleting a certaing file. So I came across the flock command, it seems to fit my need, but I didnt get its sintax. If I only indicate a shared lock, it doesnt work: flock -s "./file.xml" If I add a timeout parameter, it still doesnt work flock -s -w5 "./file.xml" It seems that way, it fits in flock [-sxun][-w #] fd# way. (What is this fd# parameter?) So, I tried the flock [-sxon][-w #] file [-c] command Using flock -s -w5 "./file.xml" -c "tail -3 ./file.xml" and it worked, tail command at ./file.xml was executed. But I would like to know, does the lock end after the command or does it last 5 seconds after the end of the command execution? My main question is, how can I prevent another root process deleting a file in linux?

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• django multi-language (i18n) and seo

  - by fumer

  hi, I am developing a multi-language site in django. In order to improve SEO, i will give every language version a unique URL like below, english: www.foo.com/en/index.html french: www.foo.com/fr/index.html chinese: www.foo.com/zh/index.html However, Django looks for a "django_language" key in user's session or cookie to determine language in default, so,Despite which language user chose, URL is always the same. for instance: http://www.foo.com/index.html how to resolve this problem ? thank you!

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• Just an experiment changing the application data path

  - by Arthur

  When I change the Appication Data path in windows xp registry to a network folder I get this error message on the next system startup: "windows cannot load the user's profile but has logged you with the default profile system" The registry keys are: "[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]" "[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders]" under the names "AppData" and "Local AppData" I dont care if "Windows logins you with the default profile system" but is there a way to disable that message, or change the message timeout form 30 seconds to 0?,or maybe create an script that changes the Application Data path every system startup? P.S. The computer with the shared folder is always on.

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• QtWebkit and hasPendingEvents() always True

  - by Deorf

  Hello. I use project webkit2png (slightly appended) to take screenshots in Linux. On the server running the latest version QtWebkit and Python 2.6 On some sites (eg 118114.cn) problem and the application hangs forever. Debug shows that the problem in this code snippet: while self.__loading:    if timeout 0 and time.time() = cancelAt:       raise RuntimeError("Request timed out on %s" % url)    while QApplication.hasPendingEvents():       QCoreApplication.processEvents() Full version of the source code is available here (lines 270-275) Somehow Loading-event hangs and hasPendingEvents can not be False. Most of the screenshots are created normally, but sometimes due to some URL drops my app: ( Does anyone know how to solve this problem and why the event hangs?

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• sqlite3.OperationalError: database is locked - non-threaded application

  - by James C

  Hi, I have a Python application which throws the standard sqlite3.OperationalError: database is locked error. I have looked around the internet and could not find any solution which worked (please note that there is no multiprocesses/threading going on, and as you can see I have tried raising the timeout parameter). The sqlite file is stored on the local hard drive. The following function is one of many which accesses the sqlite database, and runs fine the first time it is called, but throws the above error the second time it is called (it is called as part of a for loop in another function): def update_index(filepath): path = get_setting('Local', 'web') stat = os.stat(filepath) modified = stat.st_mtime index_file = get_setting('Local', 'index') connection = sqlite3.connect(index_file, 30) cursor = connection.cursor() head, tail = os.path.split(filepath) cursor.execute('UPDATE hwlive SET date=? WHERE path=? AND name=?;', (modified, head, tail)) connection.commit() connection.close() Many thanks.

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• What can cause forms authentication to forget you are logged in?

  - by metanaito

  I have an asp.net web site that uses forms authentication. When users check the "remember me" it will remember the user if they close the browser and come back. I have the timeout set for a day or so. Recently I've noticed that I can be browsing the site and suddenly it forgets I'm logged in. It does not happen after 20 minutes as I can be actively browsing. My question is, what can cause this to happen? If the server recycles the app or app pool will the login be lost? On my local I can restart my machine and when I come back I'm still logged in.

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• Best Practices for Working with Multiple Monitors in Visual Studio 2010

  - by Clever Human

  Now that Visual Studio 2010 has support for multiple monitors, I am curious how other people have their environments arranged. I have yet to come up with an arrangement that I am really satisfied with. The current best I have come up with for my 2 monitor system is to have all code windows detached. Then, on my primary monitor, I am able to have two code windows side by side (using the Windows 7 keyboard shortcuts WinKey+LeftArrow and WinKey+RightArrow.) On my secondary monitor I put the rest of the IDE with all of the tool windows that are normally on the bottom (errors list, find window, call stack, etc...) docked where the code windows normally go. I've also tried having all those things detached and having almost nothing in the IDE proper. The problems with this layout are: Newly opened code windows always open in the IDE, not on top of one of the detached windows. Detached code windows do not remember their exact placement from session to session (they are slightly off, having me to use the winkey + arrow key shortcut again and again for each window. There seems to be no way to have the code panes aware that they are on top of one another (IE -- multiple tabs.) The CTRL+TAB shortcut always displays on top of the IDE proper. The Code Panes are always "on top" of (children of) the IDE. So clicking on any code pane brings the IDE to the foreground, even when I care only about that code pane, and not the IDE. Other more minor issues... What would go a long way to making this better is having the code panes detach such that they are tab strips that can have other code panes docked within them. The new multi-monitor support in VS2010 is good, but it still seems really lacking. Can these issues be solved with an add-in? If so, is anyone aware of one? Is there a better way to work with the IDE on multiple monitors than what I am doing? NOTE: While this question is subjective (there is certainly no "this is the best way and that's final" answer) I'd really like to know possibly better methods of working with the IDE than what I have come up with. The intent is not to start a "mine's best" flame war.

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• Selectively turning off Devise's flash notices in Rails 3

  - by Sim

  The Devise authentication framework uses flash notices everywhere. This makes it easy to integrate with apps but it leads to poor user experience sometimes. I am wondering what's an easy way to selectively turn off some of the Devise flash notices in my Rails 3 app. In particular, I'd like to get rid of the blatantly obvious signed_in and signed_out flashes. Some searching suggested subclassing the session controller or use something like this but I haven't been able to find any simple solutions to this problem.

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• node.js express app won't start (or debug) in Eclipse (Nodeclipse)

  - by Ultra

  When I do on my app.js Debug As > Node Application it says Launching STANDALONE_V8 has encountered a problem. Failed to connect to Standalone V8 VM connect timed out It should start an app. Doing so directly on my terminal works fine. When I start a debug session in my terminal and than try to debug it in Eclipse works fine too. So is there anything that has to be done in order to make it work in Eclipse?

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• 'EXC_BAD_ACCESS' When trying to access a variable?

  - by Nick Brooks

  I get an 'EXC_BAD_ACCESS' error when trying to access variable in a function other than the one it was set in: NSLog(@"Commening search (%@)",sessionID); // This causes it The variable is set in the 'awakeFromNib' function: //Retrieve Session-ID sessionID = [self getSessionID]; The variable itself is defined in the header: NSString *sessionID;

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• update a user status by ajex

  - by Arpan

  how we can update a user status by ajex. user id store in session.. plz send me the code...for php mysql

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• How do i know if a mysql table is using myISAM or InnoDB Engine

  - by kamal

  I want to confirm if the statement below is indeed true: There is no way to specify a storage engine for a certain database, only for single tables, You can, however, specify a storage engine to be used during one session with: SET storage_engine=InnoDB; so you don't have to specify it for each table. How do i confirm, if indeed all the tables are using InnoDB All the tables were using myISAM.

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• Socket left in TIME_WAIT after file transfer via netcat

  - by com

  Using Copying by NetCat I am trying to copy files throught network by NetCat. From console it work pretty well. First I run listening netcat on the destination machine and after I run sending on source machine. The problem is it's doen't work from script from the source machine: ssh -f user@$desthost 'nc -l 1234 | tar xvf - /dev/null &' #listening on destination host tar cv /tmp/file | nc $desthost 1234 #sending to destination host I saw that after running port 1234 is still was open and status of the socket was TIME_WAIT. If you know what's the problem, please, help me out. And by the way, after copying how can I validate that the content is identical? Thanks! Addendum: I found one very strange thing, the same implementation with screen on destination work works, but not stable, sometimes it doesn't copy a file. ssh user@$desthost screen -dm -S test 'nc -l 1234 | tar xvf - ' #listening on destination host Maybe there is an issue with timeout?

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• Implementing long running search in ASP.NET

  - by Gursharn Singh

  I am building a search page in asp.net 3.5. Search takes a bit of time (few seconds to few minutes). Current I use AsyncMethodCaller to call Search method. AsyncMethodCaller method stores search results in Session. I user Ajax timer to check if Search method finished and then display results. What would be the best way to implement this scenario?

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• Are NHibernate lists loaded on demand?

  - by André Pena

  This is a pretty simple question. When I do this: session.CreateCriteria(typeof(Product)).List(); The resulting list will load as I access it? Let's say, from 100 to 100 elements for example? Or will it load all once? In the case it's not "virtual" how can I make it so? What's the best pratice about it? Thanks;

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• A beginner's log4J question

  - by Nitesh Panchal

  Hello, i configured log4j for basic purpose usin the conversion pattern :- log4j.appender.rollingFile.layout.ConversionPattern=%p %t %c - %m%n But now i want to log the class name from which the error came as well as the username(available in session object) as well as the date and time when that event occurs. How do i do this? What changes do i need to make in format string? Thanks in advance :)

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• Stateless NHibernate for querying

  - by JontyMC

  We have a database that is updated via a background process. We are using NHibernate to query the data for display on the web UI, so we don't need change tracking or lazy-loading. If we mark all the mappings as mutable="false", is this the same as using a stateless session?

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• Can you read pragma statements on command line startup in SQLite

  - by thermans

  I use the command line sqlite3 executable to check queries I make from my code. Is there a way to read in pragma statements or other session setup (".mode csv" for example) when the executable starts up? I know I can do a ".read " once I'm in, but that's tedious.

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• PHP curl post to login to wordpress

  - by Sbad

  I am using php curl to login to wordpress behind-the-scenes as described here: Wordpress autologin using CURL or fsockopen in PHP However my script is not setting the cookies necessary to retain the wordpress session. Instead they are being sent back to my script and stored in cookies.txt. Both the curl script and the wordpress login are on the same server in different directories. Do I need to write another curl script to manually set the wordpress cookies? Is that possible?

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• jQuery blockUI and AJAX POST

  - by oompahloompah

  I am using jQuery BlockUI in a project. For a particular user action, I want to block the UI, and then POST data to the server. When the timeout event occurs OR the server returns, I want to unblock the page. I can't seem to implement this behaviour. This is what I have so far (not working) $(document).ready(function(){ $('#test').click(function(event){ $.blockUI({ message: $('#syntax-chk') }); $.ajax({ type: 'POST', url: 'www.example.com', data: somedata, dataType: "json" }); setTimeout(function() { $.unblockUI({ onUnblock: function(){ alert('onUnblock'); } }); }, 2000); }); can anyone spot what I may be doing wrong?

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• Update database in asp.net not working

  - by Badescu Alexandru

  Hello ! i have in asp.net a few textboxes and i wish to update my database with the values that they encapsulate . The problem is that it doesn't work and although it doesn't work, the syntax seems correct and there are no errors present . Here is my linkbutton : <asp:linkbutton id="clickOnSave" runat="server" onclick="Save_Click" Text="Save Profile" /> and my update function protected void Save_Click(object sender, EventArgs e) { SqlConnection con = new System.Data.SqlClient.SqlConnection(); con.ConnectionString = "DataSource=.\\SQLEXPRESS;AttachDbFilename=C:\\Users\\alex\\Documents\\seeubook_db.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"; con.Open(); String commandString = "UPDATE users SET last_name='" + Text4.Text.Trim() + "' , first_name='" + Textbox1.Text.Trim() + "' , about_me='" + Textbox5.Text.Trim() + "' , where_i_live='" + Textbox2.Text.Trim() + "' , where_i_was_born='" + Textbox3.Text.Trim() + "' , work_place='" + Textbox4.Text.Trim() + "' WHERE email='" + Session["user"] + "'"; SqlCommand sqlCmd = new SqlCommand(commandString, con); sqlCmd.ExecuteNonQuery(); con.Close(); }

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• J2EE _ Eclipse Id Exception

  - by user347672

  i import an existing simple stateless session bean project in to my eclipse Galileo workspace. it uses Jboss 4.2 server. The problem is, while try to congiure the project into server it will not shown in servers's available project list. later i try to add the project by right clicking the server but it says " there are no resources that can be added or removed from the server"... can anyone tell me the solution to run the project?

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• file_get_contents() Connection timed out problem.

  - by Syom

  i use file_get_contents() to get dinamic data. here is my script... $str = file_get_contents("http://cba.am/"); some sript here... it works fine for a long time, but now it returns Connection timed out. and what is strange, when i run the script from local server, it works fine. could you tell me why, and what can i do, to solve this. maybe i must set the higher timeout time in php.ini? Thanks

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