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• Unlimited SMS API/Gateway (Sending and Receiving)

  - by Naif

  I am creating a chat application which requires that users be able to send and receive sms messages through a web interface. It would be somewhat similar to the text messaging service available in yahoo mail or in aol instant messenger. The situation is this: Given the high quantity of messages that would be sent and received, paying on a per message basis is not economically feasible. How is it that sites such as yahoo, aim, and twitter can send and receive unlimited sms messages? Essentially, I am looking for a way to send and receive unlimited sms from my computer. Below is a list of some approaches I've come up with but have run into problems with as well. If just one of the approaches can be utilized effectively, then I am fine. As a note on the nature of my application: I will only be sending messages to users that explicitly sign up for the service and permit the receiving of messages. They can unsubscribe at any time. This is to prevent spam. I am aware of software such as Kannel which allows one to connect to a providers smsc gateway. However, this adds the risk of not being approved by the provider which would be unacceptable. Is there any way to significantly mitigate this risk? Utilizing a gateway provider eliminates this risk, but adds the issue of per message pricing. I am also aware of email to sms. However, I have done some testing with that and it appears that this method results in many messages being undelivered or delivered VERY late. If it weren't for that, this approach would have been ideal. Is there any way to negotiate with carriers to remove me from their filters (considering the nature of my service as stated before)? I could use a gsm modem, but even with an "unilimited" plan on a sim card, there are still limits (around 100,000 messages or so). Furthermore, from my understanding, gsm modems are capable of only sending out around a dozen messages per minute. I need to be able to send out as much as several hundred messages per second. During the first 2 months, around 10 messages per second would suffice. There are ways to send out ads with messages to cover the per message costs. However, this is a deal-breaker since it has a high chance of tarnishing the quality of service. Furthermore, I know it is possible to do it without such ads since yahoo, aim, and twitter do not send ads with their messages.

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• Open Source Simple Speech Recognition in C++ in Windows

  - by Cenoc

  Hey Everyone, I was wondering, are there any basic speech recognition tools out there? I just want something that can distinguish the difference between "yes" and "no" and is reasonably simple to implement. Most of the stuff out there seems to make you start from scratch, and I'm looking for something more high level. Thanks!

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• How about performance of linq to sql, Entity Framework and NHibernate?

  - by Abonec

  I was learning this ORM because think this is good technology for most projects. But most employers required acquirement of ADO.NET and SQL. This ORM not will use in high-loaded system (like popular web-sites)? In which types of projects this ORM will be useful? Are highly loaded projects using ORM?

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• C++ warning: suggest parentheses around arithmetic in operand of |

  - by user358172

  Hi I have a code like A = B|C|D|E; Throwing the warning "suggest parentheses around arithmetic in operand of |" Expecting that expression needs high priority paranthesis for operators, tried the following ways: A=(B|C)|(D|E); one more as : A=(((B|C)|D)|E); Still the same warning persists. Please help me in resolving this. Thanks, Sujatha

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• How to remove control chars from UTF8 string

  - by Mimefilt

  Hi there, i have a VB.NET program that handles the content of documents. The programm handles high volumes of documents as "batch"(2Million documents;total 1TB volume) Some of this documents may contain control chars or chars like f0e8(http://www.fileformat.info/info/unicode/char/f0e8/browsertest.htm). Is there a easy and especially fast way to remove that chars?(except space,newline,tab,...) If the answer is regex: Has anyone a complete regex for me? Thanks!

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• Is it reasonable to use OpenGL for desktop applications?

  - by JamesK89

  I've been writing a small desktop gadget-type application that displays scrolling text along the bottom of the screen (Similar to the old CNN news ticker), however the performance of GDI is just unsatisfactory (As high as 8-12% on a quad core and 20% on a single core) even after I've attempted to clean out bottlenecks. I was considering using OpenGL instead to render everything, but I don't know if that is a reasonable option to require users to have hardware acceleration for a tiny app like this. Does anybody have any input on this?

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• How do "modern JVMs" differ from older JVMs?

  - by Lord Torgamus

  Here's a phrase that I heard a lot throughout high school and university computer science classes: "That's not an issue for modern JVMs." Usually this would come up in discussions about overall performance or optimization strategies. It was always treated as a kind of magical final answer, though, as if it makes issues no longer worth thinking about. And that just leads me to wonder: what are the differences between the prototypical "modern JVM" and older JVMs, really?

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• Well written open source java projects

  - by Algorist

  I want to improve my design and programming skills by understanding design & code of open source projects. I downloaded hadoop,groovy but they are very difficult to follow. I am not having a clue of how to follow this code without having a high level overview of the design. Any suggestions?? Thank you.

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• Thread affinity

  - by mita

  Can we set two thread or two task to execute with different processor affinity in C#.net Application? I have read about SetThreadAffinityMask but there is no example to have that used.. or Is there any way TPL(Task Parellel Libray) executes two thread/Task in with high priorty to use 100% cpu ?

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• Web application performance: PHP or Python?

  - by Michael

  Which technology is better to use in terms of performance for high performance scalable web application? PHP or Python? The project is going to involve database.

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• Should I consider Erlang for web mvc?

  - by gotts

  Can I do that? I'm afraid that this can be an overkill and eventually I'll end up with much less productivity than with traditional stack like Ruby/Python/you name it. I understand that you will start with much lower productivity if you start to work with new technology but .. is it potentially worth trying and finally switch to Erlang as the only tool for web development and all the backend stuff. Or is Erlang more suitable for only some high performance backend tasks?

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• Elastic Load Balancing in EC2

  - by Dom

  Hi Its been on the cards for a while, but now that Amazon have released Elastic Load balancing what are your thoughts on deploying this solution for a high-traffic web app. Should we replace HAProxy or consider ELB as a complimentary service in front of HAProxy Appreciate any comments or suggestions Thanks Dom

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• Biggest performance improvement you've had with the smallest change?

  - by JoelFan

  What's the biggest performance improvement you've had with the smallest change? For example, I once improved the performance of a certain page on a high-profile web app by a factor of 10, just by moving "where customerID = ?" to a different place inside a complicated SQL statement (before my change it had been selecting all customers in a join, then later selecting out the desired customer).

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• how to active a link using java script

  - by Muhammad Sajid

  Hi i have following links Wall Introduction Activities Reviews Recommendation Photos Discussion and if I click on any link then it must be high lighted.

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• Filtering a dataframe in row names from a column value in R

  - by user1755155

  Basically I have dataframe with two columns (target_id and fpkm). I want to keep only those row names in first column that are not duplicated. For example in the below dataframe you can see there are two row names with the same name (almost) comp267138_c0_seq1 comp267138_c0_seq2 and from both and I want to keep only one comp267138_c0_seq2 based of high value in column 2. target_id fpkm comp247393_c0_seq1 3.197885 comp257058_c0_seq4 1.624577 comp242590_c0_seq1 1.750319 comp77911_c0_seq1 1.293059 comp241426_c0_seq1 1.626589 comp288413_c0_seq1 14.828853 comp294436_c0_seq1 11.555596 comp63603_c0_seq1 1.982386 comp267138_c0_seq1 8.594494 comp267138_c0_seq2 11.134958 comp321623_c0_seq1 6.934149

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• Building Website With Video Upload Feature - Possible Implementations?!

  - by Goober

  Hello! Currently I have a static html/css website that I want to build a backend onto in order to upload high quality videos to the site. I'm not entirely sure how I might go about doing this.......suggestions for implementations, language to use etc. would be greatly appreciated. I have no constraints aside from of course, spending millions of pounds......I plan to do this myself too.

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• Mysql Avg function for recent 15 records by date (order date desc) in every symbol

  - by venkatesh

  i am trying to create a statement in sql (for a table which holds stock symbols and price on specified date) with avg of 5 day price and avg of 15 days price for each symbol. table description: symbol open high close date the average price is calculated from last 5 days and last 15 days. i tried this for getting 1 symbol: SELECT avg(close), avg(`trd_qty`) FROM (select * from cashmarket WHERE symbol = \'hdil\' order by `M_day` desc limit 0,15 ) s ...but I couldn't get the desired the list for showing avg values for all symbols.

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• find and replace tokens in javascript

  - by Sourabh

  Hello, I have to do something like this string = " this is a good example to show" search = array {this,good,show} find and replace them with a token like string = " {1} is a {2} example to {3}" (order is intact) the string will undergo some processing and then string = " {1} is a {2} numbers to {3}" (order is intact) tokens are again replaced back to the string likem so that the string becomes string = " this is a good number to show" How should it be implemented so that the process is done at high performance ? Thanks in advance.

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• How to cleanup old Failed Builds in TeamCity?

  - by dr. evil

  We do have hundreds of failed builds in TeamCity (number is especially high because of old retry on fail settings) and now it's a pain to browse history. I want to clean up only old failed builds, is there anyway to do that in TeamCity? Normal clean-up policy only allows X days before the last successful build sort of clean ups.

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• Have you ever had to use bit shifting in real projects?

  - by Philip Morton

  Have you ever had to use bit shifting in real programming projects? Most (if not all) high level languages have shift operators in them, but when would you actually need to use them?

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• MongoDB query against geospatial index with maxDistance fails from node.js client

  - by user1735497

  I want to query against a geospatial index in mongo-db (designed after this tutorial http://www.mongodb.org/display/DOCS/Geospatial+Indexing). So when I execute this from the shell everything works fine: db.sellingpoints.find(( { location : { $near: [48.190120, 16.270895], $maxDistance: 7 / 111.2 } } ); but the same query from my nodejs application (using mongoskin or mongoose), won't return any results until i set the distance-value to a very high number (5690) db.collection('sellingpoints') .find({ location: { $near: [lat,lng], $maxDistance: distance / 111.2} }) .limit(limit) .toArray(callback); Has someone any idea how to fix that?

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• Why is recordset result being returned in this way for Python database query?

  - by Scott

  I have searched high and low for an answer to why query results returned in this format and how to convert to a list. data = cursor.fetchall() When I print data, it results in: (('car',), ('boat',), ('plane',), ('truck',)) I want to have the results in a list as ["car", "boat", "plane", "truck"]

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• jQuery Validation Plugin: Packer undefined error?

  - by Rosarch

  I'm using the jQuery validation plugin from bassistance.de. It works fine. From <head>: <script type="text/javascript" src="/static/JQuery.js"></script> <script type="text/javascript" src="/static/js-lib/jquery.validate.pack.js"></script> <script type="text/javascript" src="/static/js-lib/jquery.validate.additional-methods.js"></script> At first, this was the only validation code I had, and it worked: $("form").validate(); $("#form-username").rules("add", { required: true, email: true, }); It was validating this HTML: <form id="form-username-form" action="api/user_of_email" method="get"> <p> <label for="form-username">Email:</label> <input type="text" name="email" id="form-username" /> <input type="submit" value="Submit" id="form-submit" /> </p> </form> Great, everything works. But then I add this JS: $("#form-choose-options input[type='text']").rules("add", { number: true, }); to validate this markup: <form id="form-choose-options" action="api/set_options" method="get"> <p> <label for="form-min-credits">Min credits per term:</label><input type="text" name="min_credits" id="form-min-credits" /> <br /> <label for="form-optimal-credits">Optimal credits per term:</label><input type="text" name="optimal_credits" id="form-optimal-credits" /> <br /> <label for="form-max-credits">Max credits per term:</label><input type="text" name="max_credits" id="form-max-credits" /> <br /> <label for="form-low-GPA">Lowest acceptable GPA:</label><input type="text" name="low_GPA" id="form-low-GPA" /> <br /> <label for="form-high-GPA">Highest realistic GPA:</label><input type="text" name="high_GPA" id="form-high-GPA" /> <br /> <input type="hidden" class="user-pk" name="pk"/> <input type="submit" value="Submit" /> </p> </form> This causes a javascript error on document load: $.data(f.form, "validator") is undefined The error is from the packer function. What am I doing wrong?

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• Performance of String literals vs constants for Session[...] dictionary keys

  - by FreshCode

  Session[Constant] vs Session["String Literal"] Performance I'm retrieving user-specific data like ViewData["CartItems"] = Session["CartItems"]; with a string literal for keys on every request. Should I be using constants for this? If yes, how should I go about implementing frequently used string literals and will it significantly affect performance on a high-traffic site? Related question does not address ASP.NET MVC or Session.

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• Configuration file for PHP server script

  - by teehoo

  Right now I have a very high volume of requests coming to my webserver which execute a PHP CGI script. Every one of these scripts opens up a config file that I have created to load options of how the script should run. Doing a file I/O operation everytime a request comes in seems very resource intensive to me. I'm not too familiar with the advanced features of PHP, are there any alternatives to achieve what I'm doing?

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