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• WPF: Sort of inconsistence in the visual appearence of WPF controls derived by Selector class

  - by msfanboy

  Hello, focused items == selected items but selected items != focused items. Have you ever wondered about that? Do you specially style the backcolor of a focused/selected item ? I ask this question because a user has an enabled button because some customer items are selected. The user is wondering now "why the heck can I delete this customers (button is enabled...) when I have just clicked on the orders control selecting some orders ready to delete (button is enabled too). The thing is the selected customer items are nearly looking grayed out in the default style... Well its sort of inconsistence to the user NOT to the programmer because WE know the behavior. Do you cope with stuff like that?

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• Java operator overload

  - by rengolin

  Coming from C++ to Java, the obvious unanswered question is why not operator overload. On the web some go about: "it's clearly obfuscated and complicate maintenance" but no one really elaborates that further (I completely disagree, actually). Other people pointed out that some objects do have an overload (like String operator +) but that is not extended to other objects nor is extensible to the programmer's decision. I've heard that they're considering extending the favour to BigInt and similar, but why not open that for our decisions? How exactly if complicates maintenance and where on earth does this obfuscate code? Isn't : Complex a, b, c; a = b + c; much simpler than: Complex a, b, c; a.equals( b.add(c) ); ??? Or is it just habit?

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• Questions every good PHP Developer should be able to answer

  - by Rachel

  I was going through Questions every good .Net developer should be able to answer and was highly impressed with the content and approach of this question and so in the same spirit, I am asking this question for PHP Developer. What questions do you think should a good PHP programmer be able to respond to? EDIT : I am marking this question as community wiki as it is not user specific and it aims to serve programming community at large. Looking forward for some amazing responses. NOTE : Please answer questions too as suggested in the comments so that people could learn something new too regarding the language.

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• Configuring port forwarding for SSH - no response outside LAN [migrated]

  - by WinnieNicklaus

  I recently moved, and at the same time purchased a new router (Linksys E1200). Prior to the move, I had my old router set up to forward a port for SSH to servers on my LAN, and I was using DynDNS to manage the external IP address. Everything worked great. I moved and set up the new router (unfortunately, the old one is busted so I can't try things out with it), updated the DynDNS address, and attempted to restore my port forwarding settings. No joy. SSH connections time out, and pings go unanswered. But here's the weird part (i.e., key to the whole thing?): I can ping and SSH just fine from within this LAN. I'm not talking about the local 192.168.1.* addresses. I can actually SSH from a computer on my LAN to the DynDNS external address. It's only when the client is outside the LAN that connections are dropped. This surely suggests a particular point of failure, but I don't know enough to figure out what it is. I can't figure out why it would make a difference where the connections originate, unless there's a filter for "trusted" IP addresses, which is perhaps just restricted to my own. No settings have been touched on the servers, and I can't find any settings suggesting this on the router admin interface. I disabled the router's SPI firewall and "Filter anonymous traffic" setting to no avail. Has anyone heard of this behavior, and what can I do to get past it?

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• Scrolling when idle?

  - by Julie

  Can anyone point me to an example of code for a page that begins to automatically scroll when the user is idle for an amount of time? I think this is slightly beyond my skill set. I think JQuery or something similar might be appropriate but I just can't seem to figure it out. I'm designing a site for the nonprofit I work for and we don't have the money to hire a programmer. I wouldn't ask anyone to code anything for me, just to point me in the right direction. Thank you so much. Julie K.

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• Newbie can't get Tomcat to reload Flex/BlazeDS application

  - by Captain Aporam

  I'm an experienced 'old school' programmer, but new to Tomcat and Flex. I've followed the getting started for BlazeDS. I'm making changes to the Flex code using Flex Builder 3, but I just can't get the changes to show up when I refresh the page on my client. Server and client are separate physical machines, I've even re-started the server hardware. One curious thing, even when I re-started the server I didn't have to re-login to the Tomcat manager page - I didn't restart my client, I guess it remembers my session? TIA, getting frustrated - like my flex page is 'write once'.

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• Visual C# GUI Designer basic tutorial

  - by cusack

  Hi, can you recommend a Visual C# Form Designer tutorial that is targeted at experienced programmers who have at least a basic knowledge of C# but are new to the VS C# Form Designer. At least it shouldn't be targeted at programming newbs, like Introduction to Visual C# 2008 Express Edition (it explains how a comment looks like in C#). So far I've found C# Programming Tutorial - Programming Winforms in C# on stackoverflow. Wishlist: ;-) I'm more interested in focus on the designer itself rather than an explanation of single gui-elements. In other words explaining separation between generated-code, what to not edit manually (visual-c#-designer-responsibility) and on the other hand the parts for which the programmer himself is responsible. So a little more abstract best-practice point of view pointing out some caveats would be great as well. I would prefer text over video as well, but that's minor. /Wishlist Perhaps even a Microsoft reference specific to the Visual c# forms designer (which I seem to have been unable to find) would be helpful.

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• Unable to connect to FTP server using Filezilla with router in-between

  - by pkswatch

  While connecting to my web server using filezilla, i am getting this error: Status: Resolving address of ftp.mysite.org.in Status: Connecting to 199.199.199.18:21... Status: Connection established, waiting for welcome message... Response: 220---------- Welcome to Pure-FTPd [privsep] [TLS] ---------- Response: 220-You are user number 1 of 150 allowed. Response: 220-Local time is now 17:58. Server port: 21. Response: 220-This is a private system - No anonymous login Response: 220-IPv6 connections are also welcome on this server. Response: 220 You will be disconnected after 5 minutes of inactivity. Command: AUTH TLS Response: 234 AUTH TLS OK. Status: Initializing TLS... Error: GnuTLS error -9: A TLS packet with unexpected length was received. Status: Server did not properly shut down TLS connection Error: Could not connect to server I use a cradlepoint CTR35 wifi router to connect to the wired internet connection. When i connect to the same server without this router, the connection works flawlessly. So i guess there is some problem with my router firewall settings, but i dont know what! Can somebody help me out please? Note: The server requires EXPLICIT FTP OVER TLS and does not work with plain FTP sessions. And i can connect to other servers using plain FTP with the router in between.

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• How to compress .pdfs in word 2007?

  - by chobo2

  Hi I am trying to send my cover letter and resume away but apparently it is too big to send through craigs list(my computer says the total size is 500kb) as it has a 600kb limit(so small should be at least a meg). Hi there. You recently tried to email Some job Email, an anonymous craigslist address. However, your message was too big to be sent through our system. Craigslist has a 600KB limit on the messages we'll send. Please reduce the size of your mail and try again. Thanks for using craigslist. So when I convert my word 2007(.docx) files to pdf they become huge. Like they got from 32kb to 320kb. So is there a way I can either get around craigslist limits or compress my pdfs a bit to make it happy. I don't want to send zips and stuff since the person who gets it might not even know what to do. I rather not send .docx since not sure if will have office 2007 or the compatibility view installed and I rather just send it as pdf(as some place require it anyways to be in pdfs). Thanks

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• Should I use Google Web Toolkit for my new webapp?

  - by balint.miklos

  I would like to create a database backed interactive AJAX webapp which has a custom (specific kind of events, editing) calendaring system. This would involve quite a lot of JavaScript and AJAX, and I thought about Google Web Toolkit for the interface and Ruby on Rails for server side. Is Google Web Toolkit reliable and good? What hidden risks might be if I choose Google Web Toolkit? Can one easily combine it with Ruby on Rails on server side? Or should I try to use directly a JavaScript library like jQuery? I have no experience in web development except some HTML, but I am an experienced programmer (c++, java, c#), and I would like to use only free tools for this project.

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• Best practices book for CRUD apps

  - by Kevin L.

  We will soon be designing a new tool to calculate commissions across multiple business units. This new compensation scheme is pretty clever and well thought-out, but the complexity that the implementation will involve will make the Hubble look like a toaster. A significant portion of the programming industry involves CRUD apps; updating insurance data, calculating commissions (Joel included) ...even storing questions and answers for a programmer Q&A site. We as programmers have Code Complete for the low-level formatting/style and Design Patterns for high-level architecture (to name just a few). Where’s the comparable book that teaches best practices for CRUD?

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• When should assertions stay in production code?

  - by Carl Seleborg

  Hi all, There's a discussion going on over at comp.lang.c++.moderated about whether or not assertions, which in C++ only exist in debug builds by default, should be kept in production code or not. Obviously, each project is unique, so my question here is not so much whether assertions should be kept, but in which cases this is recommendable/not a good idea. By assertion, I mean: A run-time check that tests a condition which, when false, reveals a bug in the software. A mechanism by which the program is halted (maybe after really minimal clean-up work). I'm not necessarily talking about C or C++. My own opinion is that if you're the programmer, but don't own the data (which is the case with most commercial desktop applications), you should keep them on, because a failing asssertion shows a bug, and you should not go on with a bug, with the risk of corrupting the user's data. This forces you to test strongly before you ship, and makes bugs more visible, thus easier to spot and fix. What's your opinion/experience? Cheers, Carl See related question here

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• Help a Python newbie with a Django model inheritance problem

  - by Joshmaker

  I'm working on my first real Django project after years of PHP programming, and I am running into a problem with my models. First, I noticed that I was copying and pasting code between the models, and being a diligent OO programmer I decided to make a parent class that the other models could inherit from: class Common(model.Model): self.name = models.CharField(max_length=255) date_created = models.DateTimeField(auto_now_add=True) date_modified = models.DateTimeField(auto_now=True) def __unicode__(self): return self.name class Meta: abstract=True So far so good. Now all my other models extend "Common" and have names and dates like I want. However, I have a class for "Categories" were the name has to be unique. I assume there should be a relatively simple way for me to access the name attribute from Common and make it unique. However, the different methods I have tried to use have all failed. For example: class Category(Common): def __init__(self, *args, **kwargs): self.name.unique=True Spits up the error "Caught an exception while rendering: 'Category' object has no attribute 'name' Can someone point me in the right direction?

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• How to dispose data context after usage

  - by Erwin

  Hi fellow programmer I have a member class that returned IQueryable from a data context public static IQueryable<TB_Country> GetCountriesQ() { IQueryable<TB_Country> country; Bn_Master_DataDataContext db = new Bn_Master_DataDataContext(); country = db.TB_Countries .OrderBy(o => o.CountryName); return country; } As you can see I don't delete the data context after usage. Because if I delete it, the code that call this method cannot use the IQueryable (perhaps because of deferred execution?). How to force immediate execution to this method? So I can dispose the data context.. Thank you :D

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• Git push over http (using git-http-backend) and Apache is not working

  - by Ole_Brun

  I have desperately been trying to get push for git working through the "smart-http" mode using git-http-backend. However after many hours of testing and troubleshooting, I am still left with error: Cannot access URL http://localhost/git/hello.git/, return code 22 fatal: git-http-push failed` I am using latest versions of Ubuntu (12.04), Apache2 (2.2.22) and Git (1.7.9.5) and have followed different tutorials found on the Internet, like this one http://www.parallelsymmetry.com/howto/git.jsp. My VHost file currently looks like this: <VirtualHost *:80> SetEnv GIT_PROJECT_ROOT /var/www/git SetEnv GIT_HTTP_EXPORT_ALL SetEnv REMOTE_USER=$REDIRECT_REMOTE_USER DocumentRoot /var/www/git ScriptAliasMatch \ "(?x)^/(.*?)\.git/(HEAD | \ info/refs | \ objects/info/[^/]+ | \ git-(upload|receive)-pack)$" \ /usr/lib/git-core/git-http-backend/$1/$2 <Directory /var/www/git> Options +ExecCGI +SymLinksIfOwnerMatch -MultiViews AllowOverride None Order allow,deny allow from all </Directory> </VirtualHost> I have changed the ownership of the /var/www/git folder to root.www-data and for my test repositories I have enabled anonymous push by doing git config http.receivepack true. I have also tried with authenticated users but with the same outcome. The repositories were created using: sudo git init --bare --shared [repo-name] While looking at the apache2 access.log, it appears to me that WebDAV is trying to be used, and that git-http-backend is never fired: 127.0.0.1 - - [20/May/2012:23:04:53 +0200] "GET /git/hello.git/info/refs?service=git-receive-pack HTTP/1.1" 200 207 "-" "git/1.7.9.5" 127.0.0.1 - - [20/May/2012:23:04:53 +0200] "GET /git/hello.git/HEAD HTTP/1.1" 200 232 "-" "git/1.7.9.5" 127.0.0.1 - - [20/May/2012:23:04:53 +0200] "PROPFIND /git/hello.git/ HTTP/1.1" 405 563 "-" "git/1.7.9.5" What am I doing wrong? Is it an issue with the version of git and/or apache that I am using perhaps? BTW: I have read all the git http related questions on ServerFault and StackOverflow, and none of them provided me with a solution, so please don't mark this as duplicate.

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• Which are the Extreme Programming "core" practices?

  - by MiKo

  Recently, I began reading about agile methodologies and XP in particular. I am a bit confused, though, about what are considered the practices involved in extreme programming. More precisely: Wikipedia reports 12 practices, which I someway believe to be the "classic" ones. Both Kent Beck and Ron Jeffries indicate 13 practices (you can find the links at the bottom of wikipedia page about "Extreme Programming Practices", I cannot post them here since I am new user of Stack Overflow), while this review of Kent Beck's "XP explained" (2nd edition) report more than 20 somewhat different practices. As a complete beginner in the topic (and basically as a complete beginner as a programmer), I would like to be enlightened on the matter. My impression is that I should look at Beck's book, since the second edition has been written after several years of XPerience, but I can find a lot less material based on that.

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• basic sql group by with percentage

  - by David in Dakota

  I have an issue and NO it is not homework, it's just a programmer who has been away from SQL for a long time having to solve a problem. I have the following table: create table students( studentid int identity(1,1), [name] varchar(200), [group] varchar(10), grade numeric(9,2) ) go The group is something arbitrary, assume it's the following "Group A", "Group B"... and so on. The grade is on a scale of 0 - 100. If there are 5 students in each group with grades randomly assigned, what is the best approach to getting the top 3 students (the top 80%) based on their grade? To be more concrete if I had the following: Ronald, Group A, 84.5 George H, Group A, 82.3 Bill, Group A, 92.0 George W, Group A, 45.5 Barack, Group A, 85.0 I'd get back Ronald, Bill, and Barack. I'd also need to do this over other groups.

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• iTunes Visualizer Plugin in C# - Energy Function

  - by James D

  Hi, iTunes Visualizer plugin in C#. Easiest way to compute the "energy level" for a particular sample? I looked at this writeup on beat detection over at GameDev and have had some success with it (I'm not doing beat detection per se, but it's relevant). But ultimately I'm looking for a stupid-as-possible, quick-and-dirty approach for demo purposes. For those who aren't familiar with how iTunes structures visualization data, basically you're given this: struct VisualPluginData { /* SNIP */ RenderVisualData renderData; UInt32 renderTimeStampID; UInt8 minLevel[kVisualMaxDataChannels]; // 0-128 UInt8 maxLevel[kVisualMaxDataChannels]; // 0-128 }; struct RenderVisualData { UInt8 numWaveformChannels; UInt8 waveformData[kVisualMaxDataChannels][kVisualNumWaveformEntries]; // 512-point FFT UInt8 numSpectrumChannels; UInt8 spectrumData[kVisualMaxDataChannels][kVisualNumSpectrumEntries]; }; Ideally, I'd like an approach that a beginning programmer with little to no DSP experience could grasp and improve on. Any ideas? Thanks!

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• Web SMTP Server(foo.com) will not send mail to exchange server which is also(foo.com)

  - by Atom

  I think I understand this problem fully, but I do not know how to approach it or where to go in terms of troubleshooting. I've got my one domain http://foo.com that runs a Zen Cart installation that needs to be able to send emails to users(order confirmation, password reset). This works fine to send to any other domain BUT foo.com. I'm running a locally hosted exchange server that is foo.com, and we can send and receive email just fine. If I run tail -f /usr/local/psa/var/log/maillog I recieve this error: Apr 1 10:08:51 foo qmail-local-handlers[25824]: Handlers Filter before-local for qmail started ... Apr 1 10:08:51 foo qmail-local-handlers[25824]: from= Apr 1 10:08:51 foo qmail-local-handlers[25824]: [email protected] Apr 1 10:08:51 foo qmail-local-handlers[25824]: cannot reinject message to '[email protected]' Apr 1 10:08:51 foo qmail: 1270141731.583139 delivery 32410: failure: This_address_no_longer_accepts_mail./ Apr 1 10:08:51 foo qmail: 1270141731.584098 status: local 0/10 remote 0/20 I understand that the foo.com SMTP service doesn't have any account but the one that is used to authenticate mail being sent, so of course, I understand why it's saying 'this address no longer accepts mail'. My question is, how can I get the foo.com(web) SMTP service to handle emails meant for my exchange server([email protected]) or how do I handle the mail that needs to be sent to our exchange server? Is this something to do with MX records? Thanks in advance A

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• Example of code generator you made from scratch?

  - by rosscj2533

  What are some examples of code generators you have used? I think it's a cool idea, but I have trouble thinking of things they can do besides make a class based on an object's attributes/database schema (as described in The Pragmatic Programmer). What language did you write them in and what language did they output? Edit: Thanks for the responses so far. What I am really looking for is examples of code generators made from scratch for some certain purpose. I mentioned it in the title, but didn't make it very clear in my question. How did you go about making a code generator on your own and what specificly did it achieve?

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• PHP job interview questions?

  - by Richard Knop

  Hello, I'm going to attend a job interview on Friday this week. It's an interview for a position of PHP programmer (the company doesn't do websites so I guess they just need somebody to administer their website). I'm expecting there will be more people at the interview and that we will be given some simple questions or tasks in PHP so they can choose. I'd like to ask if anybody has any experience with interviews like this, what should I be expecting? What are the most common questions or simple tasks/programs in PHP employers give to potential employees? Thanks.

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• What non-programming books should programmers read?

  - by Charles Roper

  This is a poll asking the Stackoverflow community what non-programming books they would recommend to fellow programmers. Please read the following before posting: Please post only ONE BOOK PER ANSWER. Please search for your recommendation on this page before posting (there are over NINE PAGES so it is advisable to check them all). Many books have already been suggested and we want to avoid duplicates. If you find your recommendation is already present, vote it up or add some commentary. Please elaborate on why you think a given book is worth reading from a programmer's perspective. This poll is now community editable, so you can edit this question or any of the answers. Note: this article is similar and contains other useful suggestions.

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• How prevalent is the use of Emacs' eshell in multi-platform development?

  - by pajato0

  I've only recently become aware of Emacs' eshell tool. It looks quite powerful in that it is entirely written in Emacs Lisp and does not require native subshell support. The Emacs info documentation is a bit sparse but EmacsWiki has pretty decent information, at least on a first glance. Given the potential value of eshell as a scripting tool/programmer's aid that works equally well on multiple platforms I'm wondering how prevalent the use of eshell versus the normal (bash) shell is among software developers. Would those of you who have taken the time to learn it recommend it or is it one of those many interesting ideas that did not really pan out?

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• Using npm install as a MS-Windows system account

  - by Guss

  I have a node application running on Windows, which I want to be able to update automatically. When I run npm install -d as the Administrator account - it works fine, but when I try to run it through my automation software (that is running as local system), I get errors when I try to install a private module from a private git repository: npm ERR! git clone [email protected]:team/repository.git fatal: Could not change back to 'C:/Windows/system32/config/systemprofile/AppData/Roaming/npm-cache/_git-remotes/git-bitbucket-org-team-repository-git-06356f5b': No such file or directory npm ERR! Error: Command failed: fatal: Could not change back to 'C:/Windows/system32/config/systemprofile/AppData/Roaming/npm-cache/_git-remotes/git-bitbucket-org-team-repository-git-06356f5b': No such file or directory npm ERR! npm ERR! at ChildProcess.exithandler (child_process.js:637:15) npm ERR! at ChildProcess.EventEmitter.emit (events.js:98:17) npm ERR! at maybeClose (child_process.js:735:16) npm ERR! at Socket.<anonymous> (child_process.js:948:11) npm ERR! at Socket.EventEmitter.emit (events.js:95:17) npm ERR! at Pipe.close (net.js:451:12) npm ERR! If you need help, you may report this log at: npm ERR! <http://github.com/isaacs/npm/issues> npm ERR! or email it to: npm ERR! <[email protected]> npm ERR! System Windows_NT 6.1.7601 npm ERR! command "C:\\Program Files\\nodejs\\\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "-d" npm ERR! cwd D:\nodeapp npm ERR! node -v v0.10.8 npm ERR! npm -v 1.2.23 npm ERR! code 128 Just running git clone using the same system works fine. Any ideas?

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• Languages and development methodologies

  - by Carlos

  Having never worked with Ruby on Rails, I looked it up on Wikipedia. It says It is intended to be used with an Agile development methodology that is used by web developers for rapid development. This got me asking how a given language/framework can be more appropriate for given development methodologies. Are there certain languages that are more friendly for pair programming, for instance? Are there language features that make certain methodologies are more appropriate? Are there features that make certain methodologies impossible? My initial reaction is to dismiss the connection (the design process is a business process, which is more dependent on business needs that language features). But I'm an only programmer within the firm, and I'm a partner, so I get to decide the business needs. What do you think? Also, if the SO community finds that certain languages point towards certain methodologies, what methodology is most common for c#, which is what I use most of the time?

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