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• Control process concurrency in PHP

  - by Ivan

  I have programmed a simple app that every X minutes checks if an image has changed in several websites and downloads it. It's very simple: downloads image header, make some CRC checks, downloads the file, stores in a MySQL database some data about each image and process next item... This process takes about 1 minute to complete. The problem is I have noticed that while the server is executing this process I cannot access to any page in the website, even those that don't require MySQL. I don't know why it is happening and I have no clue about how to fix it. Perhaps a more advanced PHP programmer can help me.

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• Closing any open info windows in google maps api v3

  - by hhj

  As the title states, on a given event (for me this happens to be upon opening a new google.maps.InfoWindow I want to be able to close any other currently open info windows. Right now, I can open many at a time..but I want only 1 open at a time. I am creating the info windows dynamically (i.e. I don't know ahead of time how many will be generated), so in the click event of the current info window (which is where I want all the other open ones closed) I don't have a reference to any of the other open info windows on which to call close(). I am wondering how I can achieve this. I am not an experienced JavaScript programmer so I don't know if I need to use reflection or something similar here. Would the best way be just to save all the references in some sort of collection, then loop through the list closing them all? Thanks.

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• How do I setup Apache with FastCGI and Ruby?

  - by sdellysse

  I've been reading alot of forum posts, tutorials, etc., about setting up apache under linux with fastcgi. I'm trying to run fcgi for some of my ruby development (not rails), but I figure it should apply to any language. Please note that I already have apache, fastcgi, ruby-fcgi, and the like already installed on my web box. Conceptually, I'm having a hard time with it. Does apache spawn the specified fcgi processes as needed? Do I start them along side apache? Basically, I'm trying to get to a point where I am able to ask the proper questions, so apologies if the title is misleading.

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• Bash variable kills script execusion

  - by Kyle Terry

  Sorry if this is better suited at serverfault, but I think it learns more towards the programming side of things. I have some code that's going into /etc/rc.local to detect what type of touch screen monitor is plugged in and changes out the xorg.conf before launching X. Here is a small snippet: CURRENT_MONITOR=`ls /dev/usb | grep 'egalax_touch\|quanta_touch'` case $CURRENT_MONITOR in '') CURRENT_MONITOR='none' ;; esac If one of those two touch screens is plugged in, it works just fine. If any other monitor is plugged in, it stops at the "CURRENT_MONITOR=ls /dev/usb | grep 'egalax_touch\|quanta_touch'." For testing I touched two files. One before creating CURRENT_MONITOR and one after CURRENT_MONITOR and only file touched before is created. I'm not a bash programmer so this might be something very obvious.

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• Drupal email users

  - by msindle

  I'm using Drupal 6.16: When a user creates an account on my site I have them select a category (ie children, youth, adult, etc). This is done with the select list box using the content_profile module. I have a content type that posts an announcement. In this content type is a check box that says 'email group'. Right now it does nothing, but what I would like for it to do is e-mail all the users that are associated with the group they chose when signing up for their account. If this will require extra code please be specific as I am not a strong php programmer. Thanks for the help!! msindle

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• How do I learn Flash Game Development?

  - by grokker

  I'm currently a PHP programmer and one of my childhood dreams is to create a game. The problem is I don't know Flash. I'm not great at drawing stuff or even artistic. I could program a little with JavaScript and I could consider myself intermediate with JQuery. Question How do I get started with Flash Game development? What books do I read first? The type of game is a side scroller about an Indiana Jones type of character and the setting is on the jungle with trees and snakes and a lot of animals.

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• Protect individual sites on Ubuntu/Apache server

  - by Christoffer

  Hi,?? I need to set up a Apache server configuration for some client sites that run under the same Ubuntu 9.10 machine. All sites are allowed to run PHP, Python and Ruby on Rails. I do not control the source code of these sites and so I need to set up a filter in order to prevent one user to reach files on another users account.?? If I run a script to list files in "/" from one account, I can browse some files and directories in the actual server root. I want to set the root for each account to /var/usersite.com/www/ instead so that listing files in "/" shows the files in the client's root. ??How is this most easily configured??? Cheers!? /Christoffer

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• Getting "select permission denied" when using LINQ but my account is a sysadmin

  - by Wayne M

  I have a console app that's geared to be automatically ran as a Scheduled Task. I use LINQ to SQL to pull some data out of the database, format it into a CSV and email it to a client. All of a sudden I am getting the error "SELECT permission denied for table", but the account I'm using to connect to the database (specified in my app.config file) has the "sysadmin" server role (bad programmer, I know; I'll get around to changing it to a better account later but I want to make sure it works first). I can connect directly to the SQL database using that very same account and query the table in question without a problem, it only seems to be when using the LINQ code. Any idea what would be causing this?

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• Has ec2 made self-hosting possible for 'amateur' sysadmins possible?

  - by Blankman

  I'm a developer, and it seems ec2 has made it possible for a amateur sysadmin like me to setup and maintain a fairly large set of servers. Now I don't mean to undermine real sys admins, as I know the value of them but what I am trying to get at is that someone like me can setup and maintain a cluster of servers (front end web servers, with some db servers) using tools like ec2 and capistrano with the help of google. Now this isn't something I would do as a long term thing, but as a startup, one-man operation, I think I can pull this off until business takes off and I can hire this important role out. With ec2, I get my firewall, so I basically open up port 80 on my public facing server, which will run haproxy and route requests to my cluster of servers. Ofcourse I am simplifying the setup, but just want a feel for what you guys think about my perception. My application is a web application, that will be runing Ruby on rails (passenger) and talking to mysql or postgresql.

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• configuring nginx as reverse proxy

  - by user55714

  This isn't directly passenger related..but I am hoping some of you might have tried this for sure so why not ask. I am using passenger with nginx to serve my rails app on a virtual slice host. I am considering putting a reverse proxy for serving static content as well as handling etagged actions. 1 - Can I use my existing nginx installation and just change it to a reverse proxy? Do I even need a web server? What would a typical architecture look like in this case? nginx rev-proxy - nginx web server - passenger? or nginx rev-proxy - passenger? 2 - Is nginx the best choice in this case? 3 - Can my reverse proxy reside on the same slice? Thanks

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• Converting ASP.NET MVC to n-Tiered Architecture

  - by Jeff

  I just built an application using ASP.NET MVC. The programmers at my company want to build all future modules using n-Tiered (Presentation Layer, Business Logic Layer, Data Access Layer) architecture. I am not the programmer and need to know why this makes sense? Do I have to completely rewrite the entire code or can it be converted? We are building an HRIS system with Business Intelligence. Somebody please explain why or why not this approach does or does not make sense.

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• split double in c wihout any libary

  - by DoomStone

  Hello I have a question for a c programmer out there, we have a tast at school to create a soft real time system in an operation system made by our teacher. Well that is all fine and dandy, we have chosen to create a system that calcuate how many unites of medicine a diabetic need based on his or hers blood sugar. It does not need to be correct just that we have the idea of a real time system :D But we have hit a little snag our formula for calculating the units of medicine is [blood sugar] * 1.2 But the only way we can send messages between processes is via a structure that contains 8 longs, but here is where my knowledge of c ends, we need for some way to split this double into 2 longs, example: the whole number in long 0 and the decimals in long 1 and then assemble it on the other side. But I have no idea who to do this, and therefore need a little help. We have tried but we do not have access to c standard libraries

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• C# extern int ? How do I make a global var across classes and namespaces ?

  - by dr d b karron

  Dear C#'ers; As an old C/C++ programmer, I want to keep a global int counter across all of MY namespaces and classes. Public static extern int EventCount; Is not working; the VS2010 compiler won't let me have an extern int. Even with a DLLImport. [DllImport ( "SilverlightApplication37.dll" )] public static extern int EventCount; VS2010 complains Error 1 The modifier 'extern' is not valid for this item so how do i have a global int across all my code ? Cheers! dr.K

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• Separation of memory oriented process and CPU oriented process

  - by Jeevan Dongre

  I am develops guy working for an e-commerce company I am running my e-commerce application built using ruby on rails spree commerce. I am presently running 2 medium instances in the production. One is a high memory instance which has 3.8 RAM and single Core CPU and another one is high CPU instance which has Dual Core CPU. Basically AWS calls it has m1.medium and c1.medium instance respectively. My question is it possible to separate the processes according the cpu intense and memory intense? So that all the cpu intense process can be made run in high cpu instance and all the memory intense process can be made to run in the high memory instances. Is any tool available to identify those process. Kindly give me some heads up. Thank you

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• looking for help with Flash sound to play on an iPad

  - by phm

  I hope you might be willing to help me. Years ago, when I was designing a game site, it was recommended to me to do what you pretty much suggested in your answer to a question about Flash sound: put my sound effects as Flash elements. This works great on every platform except the iPad. Do you have any idea what I should do? I'd really appreciate your help and you sound like a helpful person. Some people here can be kind of mean. I'm not a programmer by training, just self taught.

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• Suggest a open source project which heavily uses java concurrency utilities?

  - by user49767

  I have done good amount of Java programming, but yet to master Threading & Concurrency. I would like to become an expert programmer in threading & concurrency. I have also took a short at Tomcat code, I was able to understand, but looking even more complex project. Could you suggest any open source project which heavily uses java threading & concurrency utilities? Note : I have also reading java.util.concurrent package source code, but eager to learn from Application perspective, than creating my own threading utilities.

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• Bash variable kills script execution

  - by Kyle Terry

  Sorry if this is better suited at serverfault, but I think it learns more towards the programming side of things. I have some code that's going into /etc/rc.local to detect what type of touch screen monitor is plugged in and changes out the xorg.conf before launching X. Here is a small snippet: CURRENT_MONITOR=`ls /dev/usb | grep 'egalax_touch\|quanta_touch'` case $CURRENT_MONITOR in '') CURRENT_MONITOR='none' ;; esac If one of those two touch screens is plugged in, it works just fine. If any other monitor is plugged in, it stops at the "CURRENT_MONITOR=ls /dev/usb | grep 'egalax_touch\|quanta_touch'." For testing I touched two files. One before creating CURRENT_MONITOR and one after CURRENT_MONITOR and only file touched before is created. I'm not a bash programmer so this might be something very obvious.

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• Real thing about "->" and "."

  - by fsdfa

  I always wanted to know what is the real thing difference of how the compiler see a pointer to a struct (in C suppose) and a struct itself. struct person p; struct person *pp; pp->age, I always imagine that the compiler does: "value of pp + offset of atribute "age" in the struct". But what it does with person.p? It would be almost the same. For me "the programmer", p is not a memory address, its like "the structure itself", but of course this is not how the compiler deal with it. My guess is it's more of a syntactic thing, and the compiler always does (&p)->age. I'm correct?

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• How can I see who in my team are writing the most code and who is writing the least using TFS?

  - by kjm

  I am having a problem with one of my team members output. He seems to be always 'busy' yet I am unable to see exactly what code he has done and he seems be delivering very little and it seems to take a long time to do so. I'd like to investigate further using TFS and was wondering if there is any functionality in TFS that shows what has been written by an individual or similar? Just to clarify I am NOT spying I am trying to resolve situation. This is only a starting point. I un derstand that quantity of code does not equate to best programmer thanks for any answers

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• Create Posterous like functionality for my website ?

  - by Rahul

  Well, the problem is i am building a web app which allows users to post on their web page from their email itself . The technically the users are group of people ( its confined to a small team ) who would like to post from time to time about the activity they do ( its regarding the fest of my college). to make it simple for them , i thought it will be better if they just send a mail to [email protected] and that will get posted to their respective web pages created by me . i am a novice php programmer and have no idea on how to proceed on this.

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• What tricks can be used to type and edit code faster?

  - by Thomas

  As Jeff Atwood noted, we are typists first, programmers second. Fast typing and editing may not be essential to be a good programmer, but it certainly helps. I noticed that I consciously and subconsciously use various tricks to get my intent across to the computer as fast as possible. What tricks can be used to type and edit code faster? I'm hoping to collect a nice list here that we can all learn from, so that we can be ever so slightly more productive. One trick per answer please! (This is not about typing speed in general. There are other questions about that. It's also not about general answers like "learn your editor's shortcut keys". Think of this topic as micro-optimizations for specific cases. See my own answers for examples of what I mean.)

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• MSSQL: Primary Key Schema Largely Guid but Sometimes Integer Types...

  - by Code Sherpa

  OK, this may be a silly question but... I have inherited a project and am tasked with going over the primary key relationships. The project largely uses Guids. I say "largely" because there are examples where tables use integral types to reflect enumerations. For example, dbo.MessageFolder has MessageFolderId of type int to reflect public emum MessageFolderTypes { inbox = 1, sent = 2, trash = 3, etc... } This happens a lot. There are tables with primary keys of type int which is unavoidable because of their reliance on enumerations and tables with primary keys of type Guid which reflect the primary key choice on the part of the previous programmer. Should I care that the PK schema is spotty like this? It doesn't feel right but does it really matter? If this could create a problem, how do I get around it (I really can't move all PKs to type int without serious legwork and I have never heard of enumerations that have guid values)? Thanks.

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• What benefits can Java developer have moving to a *NIX platform?

  - by dave-keiture

  Hi everyone, A friend of mine is a Java developer, who's using *NIX for ages. He claims that *NIX is for real Java geeks, whereas WIN is for dummies (and I'm one of them, according to him) and girls. When I ask him to argue his position, and explain, what's so good for Java developer on *NIX, he starts talking about console, wget, curl and grep. But sorry, wget and curl analogues exist for the WIN platform as well. As for the console - I'm using FAR Commander, and have access to the command line when I need. Moreover, even if I decide moving to *NIX, I will certainly use Netbeans or Eclipse there, so there will be no big difference. Guys, who use Java on *NIX, could you please give me a real killer examples, when *NIX (any util or technique) dramatically increases Java development productivity (in the way the hints are given in "The Pragmatic Programmer"), or, which is also important, gives more fun from the process. Thanks in advance!

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• What is the difference between remote procedure call and web service

  - by xiao

  Is there any clear definition about RPC and Web Service? A quick wikipedia search shows: RPC: Remote procedure call (RPC) is an Inter-process communication technology that allows a computer program to cause a subroutine or procedure to execute in another address space (commonly on another computer on a shared network) without the programmer explicitly coding the details for this remote interaction. Web Service: Web services are typically application programming interfaces (API) or web APIs that are accessed via Hypertext Transfer Protocol and executed on a remote system hosting the requested services. Web services tend to fall into one of two camps: Big Web Services[1] and RESTful Web Services. I am not quite clear what the real difference between the two things. It seems that one thing could belongs to RPC and is kind of web service at the same time. Is Web Service a higher level representation of RPC?

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• How to configure Nginx to serve a variety of back-ends via multiple FCGI processes?

  - by Ben Horton

  I've seen a lot of tutorials showing one how to set up PHP/Python/Perl/RoR on nginx via various FCGI processes. None of the tutorials that I found show one how to serve multiple FCGI services off one server. How would one configure the stable nginx (nginx-0.7.64) to serve multiple FCGI processes (one for each of the above languages)? Example addresses for each FCGI process are as follows: 127.0.0.1:8080 - PHP 127.0.0.1:8081 - Python 127.0.0.1:8082 - Perl 127.0.0.1:8083 - Ruby on Rails An example configuration file that shows one how to implement multiple FCGI's off one server is really what I need. Perhaps others will benefit as well.

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