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• Glew in VS 2010: unresolved external symbol __imp__glewInit

  - by NoviceCai

  I am learning OpenGL by following the redbook. When I come to around page 90, I need use glGenBuffers(); Then I need install "glew". By following the steps in www.cs.uiowa.edu/~cwyman/classes/common/howto/winGLUT.html I download glew.zip from glew.sourceforge.net/ and unpack the files. I put glew.h in C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Include and put glew32.lib in C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Lib and put glew32.dll in C:\Windows\System32. After that, I build my project in VS 2010 and in Linker-input, I add dependencies glew32.lib. But when I build it, I have error unresolved external symbol _imp_glewInit I spend whole day to search solutions, but did not find one. Hope someone can help me with this.

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• .NET Conditional Callback on a type.

  - by Mahesh

  I have a stock price which changes by nature all the time. And, there will be many users who wants to buy that stock. Let's say that the stock price is started at 10 and let's say, 30 people bid for 10.98, 20 people bid for 7.45, 100 people bid for 8.99. During the day, the stock price can touch any of these values, and if that happens, I want to execute all the orders for users who quoted that price. Technically, I am storing in a List. Whenever the price changes, I am checking against all the values in the list and executing those that satisfy the quoted price. Class Bids { string stockname; double quote; } Is there any better alternative way to callback the satisfied items in the list rather than checking all the items whenever there is a change?? If storing in a list is not right way of doing it, let me know the best way.

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• logrotate compress files after the postrotate script

  - by Thomas

  I have an application generating a really heavy big log file every days (~800MB a day), thus I need to compress them but since the compression takes time, I want that logrotate compress the file after reloading/sending HUP signal to the application. /var/log/myapp.log { rotate 7 size 500M compress weekly postrotate /bin/kill -HUP `cat /var/run/myapp.pid 2>/dev/null` 2>/dev/null || true endscript } Is it already the case that the compression takes place after the postrotate (which would be counter-intuitive)? If not Can anyone tell me if it's possible to do that without an extra command script (an option or some trick)? Thanks Thomas

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• Rails Asset Caching Breaks First few page loads

  - by Brian Armstrong

  We're using Rails asset caching for JS and CSS like this: <%= javascript_include_tag :defaults, 'autocomplete', 'searchbox', 'jqmodal', :cache => set_asset_cache(:admins) %> In our deploy we call rake tmp:assets:clear each time. The problem is that the first few page loads after a deploy come up with no css on the page. I guess until the cached all.js and all.css have been regenerated. We deploy many times per day and this is scary for any users who happen to come across a busted page. Have people found any way to make this smoother so the new cached assets are guaranteed to be there on the first new page load?

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• How well does Scala Perform Comapred to Java?

  - by Teja Kantamneni

  The Question actually says it all. The reason behind this question is I am about to start a small side project and want to do it in Scala. I am learning scala for the past one month and now I am comfortable working with it. The scala compiler itself is pretty slow (unless you use fsc). So how well does it perform on JVM? I previously worked on groovy and I had seen sometimes over performed than java. My Question is how well scala perform on JVM compared to Java. I know scala has some very good features(FP, dynamic lang, statically typed...) but end of the day we need the performance...

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• Iphone - Displaying NSDate values in the debugger with local timezone

  - by Oliver

  Hello, I'm trying to debug my app and there is something very annoying in the debugger : all the NSDate values are displayed in the GMT timezone. So in my debugging process, I lose a lot of time converting by myself all the displayed dates to check if they are correct in the system timezone. As I have a lot of dates at midnight, even the day is displayed "wrong". It's a nightmare. Is there a way to make the debugger display the NSDate values in the iPhone system timezone (not the MacOS one nor GMT) ? I'm at GMT+1 Thank you for your help.

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• Ruby on Rails Beta 3 Install Problem on Snow Leopard

  - by Herr Kaleun

  Hello Friends, i tryed to install the new beta on my system with the command: sudo gem install rails --pre but no matter what i tryed, i still get this damn error: Successfully installed rails-3.0.0.beta3 1 gem installed Installing ri documentation for rails-3.0.0.beta3... File not found: lib Since im very very new to ruby, i really don't know what to do. How can i finish installing this? Is this installed already? Why does it abort here? I'm at the end for today. Thanks for reading. have a nice day.

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• Delete backup files older than 7 days

  - by rockbala

  Using osql command, SSQL backup of a database is created. It is saved to Disk. Then renamed to match the date of the day backup was taken. All these files are saved in a single folder all the time. for example: Batch1.bat does the following 1) Created backup.bak 2) renamed to backup 12-13-2009.bak (this is done by the combination of % ~ - etc to get the date parameter) This is now automated to take backup everyday by Task scheduler in Windows. Can the batch file also be modified to delete backup files older than 7 days? if so, how ? If it is not possible via batch file, other than manually deleting the files are there any other alternatives to automate the deleting job ? Thanks in advance, Balaji S

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• Limit the number of cron jobs runnging a PHP script

  - by ed209

  I have a daily cron job that grabs 10 users at a time and does a bunch of stuff with them. There are 1000's of users that are part of that process every day. I don't want the cron jobs to overlap as they are heavy on server load. They call stuff from various APIs so I have timeouts and slow data fetching to contend with. I've tried using a flag to mark a cron job as running, but it's not reliable enough as some PHP scripts may time out or fail in various ways. Is there a good way to stop a cron job from calling the PHP script multiple times, or controlling the number of times it is called, so there are only 3 instances for example? I'd prefer a solution in the PHP if possible. Any ideas? At the moment I'm storing the flag as a value in a database, is using a lock type file any better as in here http://stackoverflow.com/questions/851872/does-a-cron-job-kill-last-cron-execution ?

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• Python - converting wide-char strings from a binary file to Python unicode strings...

  - by Mikesname

  It's been a long day and I'm a bit stumped. I'm reading a binary file that contains lots of wide-char strings and I want to dump these out as Python unicode strings. (To unpack the non-string data I'm using the struct module, but I don't how to do the same with the strings.) For example, reading the word "Series": myfile = open("test.lei", "rb") myfile.seek(44) data = myfile.read(12) # data is now 'S\x00e\x00r\x00i\x00e\x00s\x00' How can I encode that raw wide-char data as a Python string? Edit: I'm using Python 2.6

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• Database Design: A proper table design for large number of column values.

  - by Jake

  I wish to perform an experiment many different times. After every trial, I am left with a "large" set of output statistics -- let's say, 1000. I would like to store the outputs of my experiments in a table, but what's the best way...? Option 1 Have a table with 1000 columns. Seems like a bad idea. What if the number of statistics one day exceeds the maximum number of columns? Option 2 Have a table with three columns. Let's say, ID, StatisticType, and StatisticValue. That way, you can have as many statistics as you want. However, reading a single experiments statistics becomes more complicated. Moreover, what if different statistics are different data types?? Any suggestions?

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• What problems do you find with this view on domain-driven design?

  - by Bozho

  I just wrote a long (and messy) blogpost about my view on domain-driven design at present day, with frameworks like spring and hibernate massively in use. I'd ask you to spot any problems with my views on the matter - why this won't work, why it isn't giving the benefits of DDD, why it is not a good idea in general. The blogpost is here (I don't think I need to copy-paste it on SO - if you think I should, tell me). I know the question is subjective, but it is aimed at gathering the most predominant opinions. (I'm tagging Java, since the frameworks discussed are Java frameworks)

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• iPhone / NSArray : How do I format a text file to be read in using arrayWithContentsOfFile

  - by nickthedude

  I have several large word lists and I had been loading them in place in the code as follows: NSArray *dict3 = [[NSArray alloc] initWithObjects:@"abled",@"about",@"above",@"absurd",@"absurdity", ... but now it is actually causing an exc_bad_access error weirdly, i know it seems implausible but for some reason IT IS causing it. (trust me on this I just spend the better part of a day debugging this crap) Anyway, I'm looking to get these humongous lines of code out of my files but I'm not sure what the best approach is. I guess I could do a plist but I need to figure out how to automate the process. it be easiest if I could just use the text files I've been compiling so if anyone knows how I can format the text file so that the myArray = [NSArray arrayWithContentsOfFile: @"myTextFile.txt"]; will be read in correctly as one word per element in the array it would really be appreciated. Thanks, Nick

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• Managing changes in memory-based data format

  - by kamziro

  So I've been using a compact data type in c++, and saving from memory or loading from the file involves just copying the bits of memory in and out. However, the obvious drawback of this is that if you need to add/remove elements on the data, it becomes kind of messy. There's also problems with versioning, suppose you distribute a program which uses version A of the data, and then the next day you make version B of it, and then later on version C. I suppose this can be solved by using something like xml or json. But suppose you can't do that for technical reasons. What is the best way to do this, apart from having to make different if cases etc (which would be pretty ugly, I'd imagine)

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• Can Goldberg algorithm in ocamlgraph be used to find Minimum Cost Flow graph?

  - by Tautrimas

  I'm looking for an implementation to the Minimum Cost Flow graph problem in OCaml. OCaml library ocamlgraph has Goldberg algorithm implementation. The paper called Efficient implementation of the Goldberg-Tarjan minimum-cost flow algorithm is noting that Goldberg-Tarjan algorithm can find minimum cost graph. Question is, does ocamlgraph algorithm also find the minimum cost? Library documentation only states, that it's suitable at least for the maximum flow problem. If not, does anybody have a good link to a nice any minimum cost optimization algorithm code? I will manually translate it into OCaml then. Forgive me, if I missed it on Wikipedia: there are too many algos on flow networks for the first day!

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• [C#] How to consume web service adheres to the Event-based Asynchronous Pattern?

  - by codemonkie

  I am following the example from http://msdn.microsoft.com/en-us/library/8wy069k1.aspx to consume a web service implemented (by 3rd party) using the Event-based Asynchronous Pattern. However, my program needs to do multiple calls to the DoStuffAsync() hence will get back as many DoStuffCompleted. I chose the overload which takes an extra parameter - Object userState to distinguish them. My first question is: Is it valid to cast a GUID to Object as below, where GUID is used to generate unique taskID? Object userState = Guid.NewGuid(); Secondly, do I need to spawn off a new thread for each DoStuffAsync() call, since I am calling it multiple times? Also, would be nice to have some online examples or tutorials on this subject. (I've been googling for it the whole day and didn't get much back) Many thanks

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• Preferred Method Of Application Purchase

  - by Chuck

  This is more of a "programmers" question, but felt that it was technical enough to belong on Stack Overflow instead. I'm launching an application soon that will follow the shareware model of purchase. I've thought about implementing this in a few ways: Limited access to the application until they purchase Full access to the application but expires after 30 day, requiring them to purchase to retain utility. Full access to the application indefinitely, but with a 10-15 second pop-up box on start-up asking them to register -- like mIRC does (or used to do). The method of authentication will be web-based. I'll provide them with an authentication key and they'll put it in the application. Whenever the application boots up, it'll check my web service and determine whether the application is genuine or not. This isn't my question. My question is: Is there a preferred method of implementation? I'd like to piss off the users as little as possible, but I'd also like to get paid for my work.

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• gethostbyname in C

  - by Matic

  I don't know how to write applications in C, but I need a tiny program that does: lh = gethostbyname("localhost"); output = lh->h_name; output variable is to be printed. The above code is used in PHP MongoDB database driver to get the hostname of the computer (hostname is part of an input to generate an unique ID). I'm skeptical that this will return the hostname, so I'd like some proof. Any code examples would be most helpful. Happy day, Matic

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• stripe payment issue ruby on rails

  - by Admir Huric

  So I have made a stripe payment option in my app. When I click the button pay now, it shows me that the payment is successful. and when I go to my stripe account and go to stripe-test and check logs, I can see my test payment with the code 200 OK. But this payment doesn't show in stripe-test events, or in stripe-test payments. Are the payments from logs processed the next day or am I doing something wrong? def charge Stripe.api_key = "some_test_api_key" customer = Stripe::Customer.retrieve(stripe_customer_id) if stripe_customer_id.nil? Stripe::Charge.create( :amount => 2500, :currency => "cad", :customer => stripe_customer_id, :description => "Usage charges for #{name}" ) end rescue Stripe::StripeError => e logger.error "Stripe Error: " + e.message errors.add :base, "Unable to process charge. #{e.message}." false end

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• How do i put this chunk of code into a php variable?

  - by Theron Chong

  if (isset($_SESSION['name'])){ //select BID and duedates which are between the range of 1-3 days // before due date from current date $query = "SELECT DueDate FROM item WHERE DueDate BETWEEN '$warning2' and '$warning' and user='$_SESSION[name]' ORDER BY DueDate DESC"; $find = mysql_query($query); $alert = mysql_num_rows($find); if ($alert>=1){ echo "You have got " .$alert. " item(s) due on: </br >"; while ($item = mysql_fetch_array($find)){ echo $item['DueDate']; echo "<br />"; } } echo "Success!"; } Question: How do i input all this code into a single php variable, say $alert. I am not clear of where to put single quotes or double quotes to make it work. At the end of the day, I will be using the variable for a javascript alert box.

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• How to notice unusual news activity

  - by ??iu

  Suppose you were able keep track of the news mentions of different entities, like say "Steve Jobs" and "Steve Ballmer". What are ways that could you tell whether the amount of mentions per entity per a given time period was unusual relative to their normal degree of frequency of appearance? I imagine that for a more popular person like Steve Jobs an increase of like 50% might be unusual (an increase of 1000 to 1500), while for a relatively unknown CEO an increase of 1000% for a given day could be possible (an increase of 2 to 200). If you didn't have a way of scaling that your unusualness index could be dominated by unheard-ofs getting their 15 minutes of fame.

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• Excel VBA: can delete validation but not add new one

  - by user1882965

  My code is as follows If Cells(Target.Row, 2) = "" And (Cells(Target.Row, 3) = "" Or Cells(Target.Row, 3) = "") Then Sheets("MySheet").Activate Cells(Target.Row, 3).Activate ActiveCell.Validation.Delete If (Cells(Target.Row, 2) = "Type A") Then ActiveCell.Validation.Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop, Operator:=xlBetween, Formula1:="=AvailableVersions" ElseIf (Cells(Target.Row, 2) = "Type B") Then ActiveCell.Validation.Delete Else ActiveCell.Validation.Add Type:=xlValidateWholeNumber, AlertStyle:=xlValidAlertInformation, Formula1:="0", Formula2:="9999999" End If End If So the issue I am having comes whenever I reach ActiveCell.Validation.Add Run Time Error '1004': Application-defined or object-defined error Not a very helpful error, and also this occurs with both number and list validation type, so I am sure it is not an issue with the list itself which has workbook level scope anyway. It never occurs on ActiveCell.Validation.Delete which I find weird? I have been all over google trying to find a solution, and most suggest that it is caused by running dynamic validation code from a button which hogs focus despite the Activate call, but I am running on sheet change event rather than on button press so I don't think this is my issue - any ideas? I've wasted basically a whole day on this! :(

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• How to set up a file server in a restricted corporate environment

  - by Emilio M Bumachar

  I work in a big corporation, and the disk space my team gets in the corporate file server is so low, I am considering turning my work PC into a file server. I ask this community for links to tutorials, software suggestions, and advice in general about how to set it up. My machine is an Intel Core2Duo E7500 @ 3GHz, 3 GB of RAM, Running Windows XP Service Pack 3. Upgrading, formatting or installing another OS is out of the question. But I do have Administrator priviledges on the PC, and I can install programs (at least for now). A lot of security software I don't even know about is and must remain installed. But I only need communication whithin the corporate network, which is not restricted. People have usernames (logins) on the corporate network, and I need to use them to restrict access. Simply put, I have a list of logins of team members, and only people in the list should access the files. I have about 150 GB of free disk space. I'm thinking of allocating 100 GB to the team's shared files. I plan monthly backups on machines of co-workers, same configuration. But automation of backups is a nice, unnecessary feature: it's totally acceptable for me to manually copy the contents to a different machine once a month. Uptime is important, as everyone would use these files in their daily work. I have experience as a python and C programmer, but no experience whatsoever as a sysadmin, and almost nothing of my programming experience is network programming. I'm a complete beginner in this. Thanks in advance for any help. EDIT I honestly appreciate all the warnings, I really do, but what I plan to make available is mostly stuff that now is solely on DVDs just for space reasons. It's 'daily work' to read them, but 'daily work write' files will remain on the corporate server. As for the importance of uptime, I think I overstated it: a few outages are OK, it's already an improvement over getting the DVDs. As for policy, my manager is kind of on my side, I will confirm that before making my move. As for getting more space through the proper channels, well, that was Plan A, and it's still on the table... But I don't have much hope. I'm not as "core businees" as I'd like.

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• Should I really be expected to work more than 40 hours a week just because I am 'salaried developer'

  - by Ryan

  My boss says that I shouldn't be counting hours, but I am only getting paid for a full time job 40 hours per week. I don't get it. I could be using the rest of the hours in my day to run a small side business and get more income. However I have noticed other people just working and working whatever hours to hit the deadline. How is this fair? Of course the argument was 'if you worked more and increased your value then you will get more money'. A friend I regard as one of the smartest people I know (engineered his own sonar system for example) said that you should never work beyond what you are getting paid for. Thoughts?

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• Forbid developer to commit code because of making weekly build

  - by Xinwang

  Our development team (about 40 developers) has a formal build every two weeks. We have a process that in the "build day", every developers are forbiden to commit code into SVN. I don't think this is a good idea because: Build will take days (even weeks in bad time) to make and BVT. People couldn't comit code as they will, they will not work. People will comit all codes in a hurge pack, so the common is hard to write. I want know if your team has same policy, and if not how do you take this situation. Thanks

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