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• Iphone/Android app – chatroom development – what framework & hosting needs?

  - by MikaelW

  I have some experience regarding IPhone and Android development but I am now struggling to solve a new class of problem: apps that involve a client/server chatroom feature. That is, an app when people can exchange text over the internet, and without having the app to constantly “pull” content from the server. So that problem can’t be solved with a normal php/mysql website, there must be some kind of application running on a server that is able to send message from the server to the phone, rather than having the phone to check for new messages every 10 seconds… So I’m looking for ways to solve the different problems here: What framework should I use on the two sides (phone / server)? It should be some kind of library that doesn’t prevent me to write paid apps. It should also be possible to have the same server for the Iphone and android version of the app. What server / hosting solution do I need with what sort of features, I just have no experience regarding server application that can handle and initiate multiple connections and are hosted on hardware that is always online I tried to find resources online but couldn’t so far, either the libraries had the wrong kind of license/language or I just didn’t understand… Sometimes there were nice tutorial but for different needs such as peer2peer chat over local network… Same with the server and the hosting problem, not sure where to start really, I’m calling for help and I promise I will complete this page with notes about the experience I will get :-) Obviously the ideal would be to find a tutorial I missed that include client code, server code and a free scalable server… That being said, If I see something as good, it probably means that I have eaten the wrong kind of mushroom again… So, failing that, any pointer which might help me toward that quest, would be greatly appreciated. Thanks in advance. Mikael

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• Bash Script to Compress / Transfer / Remove Log Files

  - by Jason

  I am currently using chronolog to set log file names for Apache with date. They are in the following format: /WEB/LOGS/APACHE_ACCESS_YYYY-MM-DD.log /WEB/LOGS/APACHE_ERROR_YYYY-MM-DD.log I would like to have a script that runs on the first of every month and compresses the log files from the previous month, transfers them to another host (via SCP) and then deletes the compressed file. find . -name '*.log' -mtime +1 -type f I've found several examples like the one above that allow you to select files x days old, but I need all files from the previous month. I am the first to admit my bash scripting skills are weak so would really appreciate any help and guidance.

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• How do I change the Creation/Mod Date of all folders on a USB drive using Touch command?

  - by Chad--24216

  I've got a USB drive with mp3 music on it that I play in my car. My car has a USB drive port. Problem is that the car sorts the music by Creation/Modification Date (and not alphabetically). This makes it a pain to find what artist I'm looking for. To solve this problem, I need a way to "update" the Creation/Modification Date for all folders on the USB drive every time I add a new folder of music to the USB drive. Anyone know how I can do this? The Touch command works great, but the format touch <filename> would take forever to do on each folder on the drive. Anyway to select all folders on the drive and then touch <all folders>? On my USB drive I have a folder for each album and the songs within each respective folder, like so: Album-1-folder Album-2-folder I need to apply the Touch command to each of the "album" folders on the drive. I stumbled upon a simple solution to solve this issue:touch /media/USB_Drive/*

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• Validating allowed characters or validating disallowed characters

  - by Tom

  I've always validated my user input based on a list of valid/allowed characters, rather than a list of invalid/disallowed characters (or simply no validation). It's just a habit I picked up, probably on this site and I've never really questioned it until now. It makes sense if you wish to, say, validate a phone number, or validate an area code, however recently I've realised I'm also validating input such as Bio Text fields, User Comments, etc. for which the input has no solid syntax. The main advantage has always seemed to be: Validating allowed chars reduces the risk of you missing a potentially malicious character, but increases the risk the of you not allowing a character which the user may want to use. The former is more important. But, providing I am correctly preventing SQL Injection (with prepared statements) and also escaping output, is there any need for this extra barrier of protection? It seems to me as if I am just allowing practically every character on the keyboard, and am forgetting to allow some common characters. Is there an accepted practice for this situation? Or am I missing something obvious? Thanks.

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• How does syslog-ng handles flush_lines(0) ?

  - by Luke404

  I wanted to make sure my syslog-ng was doing async logging. Reading through the documentation I see the flush_lines() option for file() destinations, if unspecified, will use the global default. Then I see that the global setting defaults to 0 but it doesn't explain what that means. Is it going to do synchronous logging when set to 0? is it going to buffer an unlimited number of lines (flushing just every flush_timeout() number of seconds)? is it going to bite me?

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• Recommendation for email setup for programatically sending lots of emails

  - by jcmoney

  To clarify I have an app that notifies users via email when certain actions take place (I am not spamming as the user has opted in to the notifications and can change that option at any time). Because of number of emails that needs to be sent, Gmail, Yahoo, etc will not work. Unless I am mistaken services like MailChimp, Lyris, etc will also not fit this need since every email is sent one at a time and is very specific to the user and action that took place. What I really want is something that would allow me to be able to call some mail function, give it a recipient, from, message and subject, and not have it be blocked by the email service. This can be a free or paid service. I have server access so I can install something if necessary as well but I don't know much about email services and fear if I do it myself, I'll get blocked by some other player like my VPS host or ISP or something.

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• How to balance a non-symmetric "extension" based game?

  - by Klaim

  Most strategy games have fixed units and possible behaviours. However, think of a game like Magic The Gathering : each card is a set of rules. Regularly, new sets of card types are created. I remember that the firsts editions of the game have been said to be prohibited in official tournaments because the cards were often too powerful. Later extensions of the game provided more subtle effects/rules in cards and they managed to balance the game apparently effectively, even if there is thousands of different cards possible. I'm working on a strategy game that is a bit in the same position : every units are provided by extensions and the game is thought to be extended for some years, at least. The effects variety of the units are very large even with some basic design limitations set to be sure it's manageable. Each player choose a set of units to play with (defining their global strategy) before playing (like chooseing a themed deck of Magic cards). As it's a strategy game (you can think of Magic as a strategy game too in some POV), it's essentially skirmish based so the game have to be fair, even if the players don't choose the same units before starting to play. So, how do you proceed to balance this type of non-symmetric (strategy) game when you know it will always be extended? For the moment, I'm trying to apply those rules but I'm not sure it's right because I don't have enough design experience to know : each unit would provide one unique effect; each unit should have an opposite unit that have an opposite effect that would cancel each others; some limitations based on the gameplay; try to get a lot of beta tests before each extension release? Looks like I'm in the most complex case?

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• sublime text 2 review !

  - by Anirudha

  Few months ago I am looking for a editor to doing simply edit on html,css,javascript.  Before it I tried notepad++ which is quite awesome to do all works I want to get done with him.  I choose 2 editor on my list. first is sublime text and second is phpstorm. both are cross-plateform. I tried both and both is working fine. I finally go with sublime text 2.   Here is the reason why sublime text 2 is awesome. phpstorm and sublime text 2 both is licensed  software. In sublime text 2 you can use it for unlimited time when phpstorm is available for 30 days only. Sublime text 2 is very memory efficient and lightweight software this is first thing people found best in sublime text 2. in phpstorm problem for me is sometime it’s goes unresponsive when I tried html5 boilerplate. sublime text 2 is never hang depend on memory size of project compare to phpstorm. in Sublime text 2 you can got better speed at coding after learning some shortcut and basic thing applied specially sublime text 2. Sublime text 2 come with distraction free mode when phpstorm have nothing with full-screen. Sublime text 2 support almost every language. I have seen many people in community who has move from their PHP IDE to sublime text 2. You can use LESS and coffeescript in it. There are many kind of customization out in github regarding sublime text 2.   In past I also have also tried webmatrix. the latest version of webmatrix have nothing good as sublime text 2. Sublime text 2 is best fit for my requirement.   So cheers, people should tried once Sublime text 2 if they are look for a solid tool for learning new things. sublime text 2 can be downloaded from http://www.sublimetext.com/.   Thanks for reading my post.

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• Is it possible to bind a windows key combination to currently open application?

  - by matt

  I use launchy on every box that I have to interact with for more than a few hours a day, and it certainly makes me more efficient, but I want more. I would like to have a key combination that would take a window that I use frequently, and is always open such as mRemote or FAR manager, and bring it to the foreground. I have been alt-tabbing around forever, and it's getting old if there are more than a few windows open. Anyone have any ideas on this? Thanks, matt.

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• Is it possible to bind a windows key combination to currently open application?

  - by matt

  I use launchy on every box that I have to interact with for more than a few hours a day, and it certainly makes me more efficient, but I want more. I would like to have a key combination that would take a window that I use frequently, and is always open such as mRemote or FAR manager, and bring it to the foreground. I have been alt-tabbing around forever, and it's getting old if there are more than a few windows open. Anyone have any ideas on this? Thanks, matt.

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• bash and arithmetic comparison: double quotes or not?

  - by Martin

  when comparing two integers in bash, do we have to put double quotes ? In the official document http://tldp.org/LDP/abs/html/comparison-ops.html I can read that double quotes should appear every time... But what is the differences in the following examples: [ "$VAR" -eq "1" ] [ $VAR -eq "1" ] [ "$VAR" -eq 1 ] [ $VAR -eq 1 ] As I am curious, a took a look at Ubuntu init scripts in /etc/init.d and there are many usage of arithmetic comparison in it, at least [ "$VAR" -eq "1" ] and [ $VAR -eq 1 ] are used... but it seems no one really "knows" what is the official way to do it. Thanks !

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• Which app has a notification sound with 3 descending notes?

  - by Eric

  Brand new Windows 7 box loaded with the usual dev tools -- VS2008, Firefox, Chatzilla, Thunderbird, emacs, Pidgin, Putty, iTunes, SharpReader. Every couple of minutes, I get an audio notification consisting of three rising notes, maybe a middle-C-G-F on a piano (I don't have a piano handy, and don't have time to use GarageBand to try to figure it out). Nothing in the notification bar is flashing when this happens. The sound isn't in any of the Windows Sound control panel applets. And it's not in C:\Windows\Media, so it's most likely coming from a non-Microsoft app. Any chance it's Pidgin when the status one of my contact's changes (which happens plenty frequently)? Oh, look at this --- Tools/Mute Sounds. Let's try that and see what happens... Is this familiar to anyone?

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• Permanently mount multiple directories from different disks under /

  - by piotrek

  I have SSD and HDD. Some directories like /var, /srv and /tmp should be on HDD, while /boot, /usr and /lib on SSD. But do I have to create separate partition for every single directory? I want to have 2 or so partitions. One for each disk and distribute directories as needed. Is it possible and how? I've heard about symlinks, mount --bind, mhddfs but: symlinks are treated differently by tools like cp, so I'm not sure if it's safe to have main system directories symlinked I have no idea how can I use mount --bind or mhddfs in fstab

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• How do I speed up XML parsing operation?

  - by absentx

  I currently have a php script set up to do some xml parsing. Sometimes the script is set as an on page include and other times it is accessed via an ajax call. The problem is the load time for this particular page is very long. I started to think that the php I had written to find what I need in the XML was written poorly and my script is very resource intense. After much research and testing the problem is indeed not my scripting (well perhaps you could consider it a problem with my scripting), but it looks like it takes a long time to load the particular xml sources. My code is like such: $source_recent = 'my xml feed'; $source_additional = 'the other feed I need'; $xmlstr_recent = file_get_contents($source_recent); $feed_recent = new SimpleXMLElement($xmlstr_recent); $xmlstr_additional = file_get_contents($source_additional); $feed_additional = new SimpleXMLElement($xmlstr_additional); In all my testing, the above code is what takes the time, not the additional processing I do below. Is there anyway around this or am I at the mercy of the load time of the xml URL's? One crazy thought I had to get around it is to load the xml contents into a db every so often, then just query the db for what I need. Thoughts? Ideas?

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• Weird routing problems with VPN

  - by Borek

  In our VPN setup I have to add a route to my routing table like this: route add 1.2.3.0 mask 255.255.255.0 172.16.1.1 -p Our internal addresses 1.2.3.x then use 172.16.1.1 as their gateway and both my local internet and work VPN can work at the same time. However, when I disconnect from VPN and reconnect again, I can't ping our servers even though the connection status is "Connected". When I do route print my previously added route is listed but it doesn't seem to work. So I try to execute that 'route add' command again and as expected, it tells me that The route addition failed: The object already exists. But - and that's the point - when I now try to ping our servers again, everything works! So every time, I have to execute this route add command that will fail but fix the issue at the same time. Any ideas what I might be doing wrong? My PC is Windows 7 x64, I am Administrator, UAC is enabled and the command prompt is run with elevated privileges.

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• No option to select ASP.Net Version in IIS 6?

  - by GenericTypeTea

  I'm running Windows Server 2003 64bit edition. I've just installed the .Net 4 Framework in order to get a new WCF service up and running. However, I have no options anywhere in IIS 6 for selecting the ASP.Net framework version. I.e. Right click Properties on the website should have as ASP.Net tab from where I should be able to select v2 or v4. Does anyone know why they're not there and how I can make them appear? For the time being I've had to go into Website Properties Home Directory Configuration and change the .svc extension to use v4.0.30319 instead. So, everything's now working for my WCF service, however every other extension is set to v2. How can I get the tab? It's not visible on any of my 23 websites.

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• Where could Distributed Version Control Systems currently be in Gartner's hype cycle?

  - by dukeofgaming

  Edit: Given the recent downvoting (+8/-6 at this point) it was made clear to me that Gartner's lifecycle is a biased metric from a programmer's perspective. This is something that is part of a paper I'm going to present to management, and management types are part of Gartner's audience. Giving DVCS exposure & enthusiasm (that "could" be deemed as hype, or at least attacked as such), think about the following question when reading this one: "how could I use Gartner's hype cycle to convince management that DVCSs are ready (or ready-enough) for us, and that it is not just hype" Just asking if DVCSs is hype wouldn't be constructive, Gartner's hype cycle is a more objective instrument than just asking that (even if this instrument is regarded as biased). If you know any other instrument please, by all means, mention it. Edit #2: I agree that Gartner's Life Cycle is not for every technology, but I consider it may have generated enough buzz to be considered hype by some, so it maybe deserves to be at least evaluated/pondered as such by using this instrument in order to prove/disprove it to whatever degree. I'm an advocate of DVCS, BTW. I'm doing research for a whitepaper I'm writing in favor of DVCS adoption at company and I stumbled upon the concept of social proof. I want to prove that the social proof of DVCS adoption is not necessarily cargo cult and doing further research I now stumbled upon Gartner's hype cycle which describes technology maturity in 5 phases. My question is: what could be an indicator of the current location of Distributed Version Control Systems (I mean git, mercurial, bazaar, etc. in general) at a particular phase in the hype cycle?... in other (less convoluted) words, would you say that currently expectations of DVCSs are a) starting, b)inflated, c)decreasing (disillusionment), d)increasing (enlightenment) or e)stabilizing (mature) and (more importantly) why? I know it is a hard question and there is subjectivity involved, but I'll grant the answer (and the traditional cookie) to the clearest argument/evidence for a particular phase.

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• How to change system time or force a time sync

  - by cpury

  My laptop is probably running out of CMOS battery, I know I have to fix it soon, but until then, this very annoying issue keeps me from using it. Scenario: My system clock is reset to 15/12/08 11:00 AM every time I turn on my computer. This has all sorts of side-effects, one of the more annoying being that I can't log into my gmail. At first I just waited for a time sync to happen, as I have that activated and all. It never happened. I googled and didn't find any way of enforcing a time sync, which I found very strange. Is there really none? Setting the time and date by hand is also a problem. For my 12.10 installation, the time & date settings are bugged. I remember it being for my last, older installation as well, though. Of course the easiest way should be to just manually edit the date and time fields by entering a new date. This is possible in theory, but the changes are reverted as soon as the text boxes loose focus. The other way to do it is to click the +-buttons for a long, long time. The first time I did that, the changes weren't stored either. I found out that afterwards I have to switch from manual to internet-sync mode and wait ~5 seconds until the in the top left corner of my system the new time is shown, or otherwise it won't have effect. So a nice solution would be one of the following: Setting the time/date by hand, maybe via terminal, so I can just enter the right values. Or, a command that would enforce an immediate time sync, that I can run after booting. I know I have to change the batteries soon, but this is seriously keeping me from working...

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• How to keep haproxy log messages out of /var/log/syslog

  - by itsadok

  I set up haproxy logging via rsyslogd using the tips from this article, and everything seems to be working fine. The log files get the log messages. However, every log message from haproxy also shows up at /var/log/syslog. This means that once the server goes live, the syslog will be quite useless, as it will be run over with haproxy log messages. I would like to filter out those messages from /var/log/syslog. After going over the rsyslogd documentation, I tried to change the file /etc/rsyslog.d/50-default.conf thus: *.*;auth,authpriv.none;haproxy.none -/var/log/syslog I simply added the ;haproxy.nonepart. After restarting rsyslogd it stopped working completely until I reverted my changes. What am I doing wrong?

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• PostSharp deployment to build machine- use Setup installation, not NuGet package.

  - by Michael Freidgeim

  PostSharp has well documented different methods of installation. I've chosen installing NuGet packages, because according to  Deploying PostSharp into a Source Repository NuGet is the easiest way to add PostSharp to a project without installing the product on every machine. However it didn't work well for me. I've added PostSharp NuGet package to one project in the solution.  When I wanted to use PostSharp in other project, Visual Studio tab showed that PostSharp is not enabled for this project I've added the NuGet package to the new project, which installed a new version of the package in the new Packages subfolder. When I wanted to refer PostSharp from the third project, I've ended up with another version of PostSharp installed. Additionally multiple versions of Diagnostics were created. It definitely causes confusion and errors.   More problems we experienced on build server. According to Using PostSharp on a Build Server "If you chose to deploy PostSharp in the source repository, it does not need to be installed specifically on the build server. " It didn't work on our build server. I kept getting errors "The "AddIns" parameter is not supported by the "PostSharp21" task." and "The "DisableSystemBindingPolicies" parameter is not supported by the "PostSharp21" task."   From my experience the only way to have the latest version of PostSharp working on the build server is to install it using Setup as described in Deploying PostSharp with the Setup Program     Gael acknowledged the issues with possible version conflicts. see http://support.sharpcrafters.com/discussions/problems/388-the-postsharp21-task-failed-unexpectedly

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• Velocity control of the player, why doesn't this work?

  - by Dominic Grenier

  I have the following code inside a while True loop: if abs(playerx) < MAXSPEED: if moveLeft: playerx -= 1 if moveRight: playerx += 1 if abs(playery) < MAXSPEED: if moveDown: playery += 1 if moveUp: playery -= 1 if moveLeft == False and abs(playerx) > 0: playerx += 1 if moveRight == False and abs(playerx) > 0: playerx -= 1 if moveUp == False and abs(playery) > 0: playery += 1 if moveDown == False and abs(playery) > 0: playery -= 1 player.x += playerx player.y += playery if player.left < 0 or player.right > 1000: player.x -= playerx if player.top < 0 or player.bottom > 600: player.y -= playery The intended result is that while an arrow key is pressed, playerx or playery increments by one at every iteration until it reaches MAXSPEED and stays at MAXSPEED. And that when the player stops pressing that arrow key, his speed decreases until it reaches 0. To me, this code explicitly says that... But what actually happens is that playerx or playery keeps incrementing regardless of MAXSPEED and continues moving even after the player stops pressing the arrow key. I keep rereading but I'm completely baffled by this weird behavior. Any insights? Thanks.

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• How do I backup Credentials Manager passwords (Windows 7)

  - by Andrew J. Brehm

  I am trying to create a backup of my stored passwords in Credentials Manager. But after Windows switches to the secure desktop to get the password for the backup file it simply announced that "Your stored logon credentials could not be backed up" and gives as explanation "Element not found", neither of which is helpful. (In fact I hate the "X could not Y" type of error message). I am an administrator on the machine and there is only one password in Credentials Manager. The sole point of the backup is to create a nearly empty Credentials Manager so that I don't have to delete manually hundreds of password entries every time I have to change my domain password. (I think Microsoft haven't throught this through properly. There appears to be no way to delete more than one entry at a time.) Any ideas?

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• Java sound doesn't work under Linux

  - by Cliff

  Help! I'm getting frustrated by the individual hoops I have to go through to eek sound out of my speakers when running Java apps on Linux platforms! I just installed Fedora 12 and after downloading and running the Java Sound Demo I get exceptions. If I run just a vanilla Java program that plays a wav file it runs silently with no sound and no exceptions. Every other app seems to play sound. I also took some advice from this thread in the Ubuntu forums which almost seemed to work. (Installing aoss got rid of the initial exceptions in the sound demo but I still hear nothing when I play.) can somebody help me figure out what's wrong?

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• Netsh commands not working on remote computer

  - by Mike Christiansen

  Hello, At work, we are in the process of migrating over 200 computers from static IPs to DHCP. The DHCP server is configured. My biggest hurdle is physically going to every single computer in the area and configuring them all for DHCP. I am trying to use netsh to accomplish this. However, I cannot even seem to set one computer to DHCP remotely. The command I am trying is: netsh -r COMPUTERNAME interface ip set address name="Local Area Connection" source=dhcp netsh -r COMPUTERNAME interface ip set dns name="Local Area Connection" source=dhcp This results in the error The following command was not found: interface ip set address "name=Local Area Connection" source=dhcp. Any ideas?

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• SQL SERVER – Follow up – Usage of $rowguid and $IDENTITY

  - by pinaldave

  The most common question I often receive is why do I blog? The answer is even simpler – I blog because I get an extremely constructive comment and conversation from people like DHall and Kumar Harsh. Earlier this week, I shared a conversation between Madhivanan and myself regarding how to find out if a table uses ROWGUID or not? I encourage all of you to read the conversation here: SQL SERVER – Identifying Column Data Type of uniqueidentifier without Querying System Tables. In simple words the conversation between Madhivanan and myself brought out a simple query which returns the values of the UNIQUEIDENTIFIER  without knowing the name of the column. David Hall wrote few excellent comments as a follow up and every SQL Enthusiast must read them first, second and third. David is always with positive energy, he first of all shows the limitation of my solution here and here which he follows up with his own solution here. As he said his solution is also not perfect but it indeed leaves learning bites for all of us – worth reading if you are interested in unorthodox solutions. Kumar Harsh suggested that one can also find Identity Column used in the table very similar way using $IDENTITY. Here is how one can do the same. DECLARE @t TABLE ( GuidCol UNIQUEIDENTIFIER DEFAULT newsequentialid() ROWGUIDCOL, IDENTITYCL INT IDENTITY(1,1), data VARCHAR(60) ) INSERT INTO @t (data) SELECT 'test' INSERT INTO @t (data) SELECT 'test1' SELECT $rowguid,$IDENTITY FROM @t There are alternate ways also to find an identity column in the database as well. Following query will give a list of all column names with their corresponding tablename. SELECT SCHEMA_NAME(so.schema_id) SchemaName, so.name TableName, sc.name ColumnName FROM sys.objects so INNER JOIN sys.columns sc ON so.OBJECT_ID = sc.OBJECT_ID AND sc.is_identity = 1 Let me know if you use any alternate method related to identity, I would like to know what you do and how you do when you have to deal with Identity Column. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLServer, T SQL, Technology

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