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• please help me understand libraries/includes

  - by fiftyeight

  I'm trying to understand how libraries work. for example I downloaded a tarball and extracted it. Now I do "./configure", it searches in pre-defined directories from what I understand for certain library files. What does it do then? it creates a makefile, and the makefile contains the paths to these libraries? than I do "make", it complies the source code and hard-codes the locations of the libraries? am I correct? I do not really understand if libraries are files with pre-defined paths or the OS somehow gives access to the libraries through system calls. another example, I complied something on my computer than moved it to a remote server, the executable needs mysql libraries to work, the server has mysql but for some reason when execute the file it tells me "can't find libmysqlclient.so.16". is there a solution for this? is there a way to know where is tries to locate this file or give it another path? I can't compile it on the server since it has no compiler and I don't have root access to install packages last question is if in the sequence "./configure","make","make install" the "make install" command is the only one that actually puts files outside the directory in which these files reside? if for example the software will be installed in /usr/local/ is the "make install" command the only one that will require "sudo" before it? let me see if I got it correctly: "./configure" creates the Makefile according to the location of various files on your system. "make" compiles the source code according to this makefile. and "make install" moves the files to their appropriate location. I know this has been very long I thank anyone who had the patience to read my question :)

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• Windows Explorer Jumplist delay

  - by Jeremy B.

  I've begun to have an issue with the Jump list for Windows Explorer (Windows 7). What happens is that when i gesture click, or right click on the explorer icon the first time after rebooting the initial menu (Windows Explorer, Unpin) and the Jump List with my pinned folders and frequent folders works fine. Any subsequent attempt will open the initial menu, but the jump list will experience a long delay (10-20 seconds) before the pinned and frequent folders will pop up. Initially my frequent folders would grab a networked drive which I thought might be the cause. I have removed that from the list and there is still no change. I really enjoy being able to quickly hit directories i use often and this is quite frustrating. Any help would be extremely appreciated.

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• Jump handling and gravity

  - by sprawl

  I'm new to game development and am looking for some help on improving my jump handling for a simple side scrolling game I've made. I would like to make the jump last longer if the key is held down for the full length of the jump, otherwise if the key is tapped, make the jump not as long. Currently, how I'm handling the jumping is the following: Player.prototype.jump = function () { // Player pressed jump key if (this.isJumping === true) { // Set sprite to jump state this.settings.slice = 250; if (this.isFalling === true) { // Player let go of jump key, increase rate of fall this.settings.y -= this.velocity; this.velocity -= this.settings.gravity * 2; } else { // Player is holding down jump key this.settings.y -= this.velocity; this.velocity -= this.settings.gravity; } } if (this.settings.y >= 240) { // Player is on the ground this.isJumping = false; this.isFalling = false; this.velocity = this.settings.maxVelocity; this.settings.y = 240; } } I'm setting isJumping on keydown and isFalling on keyup. While it works okay for simple use, I'm looking for a better way handle jumping and gravity. It's a bit buggy if the gravity is increased (which is why I had to put the last y setting in the last if condition in there) on keyup, so I'd like to know a better way to do it. Where are some resources I could look at that would help me better understand how to handle jumping and gravity? What's a better approach to handling this? Like I said, I'm new to game development so I could be doing it completely wrong. Any help would be appreciated.

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• Does it make sense to write a build scripts in C++?

  - by Klaim

  I'm using CMake to generate my projects IDE/makefiles, but I still need to call custom "scripts" to manipulate my compiled files or even generate code. In previous projects I've been using Python and it was OK, but now I'm having serious trouble managing a lot of dependencies in two very big projects I'm working on so I want to minimize the dependencies everywhere. Someone suggested to me to use C++ to write my build scripts instead of adding a language dependency just for that. The projects themeselves already use C++ so there are several advantages that I can see: to build the whole project, only a C++ compiler and CMake would be necessary, nothing else (all the other dependencies are C or C++); C++ type safety (when using modern C++) makes everything easier to get "correct"; it's also the language I know the better so I'm more at ease with it even if I'm able to write some good Python code; potential gain in execution speed (but i don't think it will really be perceptible); However, I think there might be some drawbacks and I'm not sure of the real impact as I didn't try yet: might be longer to write the code (that said I'm not sure because I'm efficient enough in C++ to write something that work quickly, so maybe for this system it wouldn't be so long to write) (compilation time shouldn't be a problem for this case); I must assume that all the text files I'll read as input are in UTF-8, I'm not sure it can be easilly checked at runtime in C++ and the language will not check it for you; libraries in C++ are harder to manage than in scripting languages; I lack experience and forsight so maybe I'm missing advantages and drawbacks. So the question is: does it make sense to use C++ for this? do you have experiences to report and do you see advantages and disadvantages that might be important?

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• How often does Dreamhost change IP Addresses

  - by pjreddie

  So I just migrated our site to dreamhost because they are free for non-profits. However, right after I switched the nameservers over to them they changed the IP address of the site. So first they propagated out IP address x.x.x.180, then they switched it to x.x.x.178 and had to propagate that out. Point being it meant a lot of downtime since a lot of big DNS servers (like google) thought the address was still x.x.x.180 for up to 5 hours after they switched it. This is compounded by the fact that most our visitors to the site live here in Unalaska and we have local DNS servers that take a LONG time to update (like a day or more) since we get all our internet over satellite. So every time Dreamhost changes our IP address it can mean a day of downtime for us in our community. So my question is, how often do these changes take place? I asked Dreamhost support and they gave me a vague response: I wish I could say, however those changes happen at random times. They're not that frequent, maybe even months between updates, but there's no way to know for sure. First, I hardly believe that they don't know their own system well enough to give me at least some estimate or average. Second, is it worth looking at other providers so that I can get a static IP address? We were hosting the site here originally and hadn't run into this problem since we have a static IP here. We don't get a ton of traffic but usually around 500 hits a day or so, sometimes more if our stories are featured on statewide or national news broadcasts. So hours of downtime every time Dreamhost "randomly" decides to move our server location can be bad for our readership.

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• Dependency Analyser

  - by tsutha

  I have been watching 3 videos put together by SSIS team on Dependency Analyser. I am happy Microsoft have made an effort to do something about it. I have been asking for this feature since SQL 2005 TAP. Still a long way to go before they catch up with competetion. It looks like it currently supports SSIS and SQL dependencies. Release note states its still in development and support only limited sets of tasks. You still would not know the impact of dropping a column on cubes, reports etc. I hope that changes by the time RTM comes out. I am struggling to understand why it is impossible to do it across the solution. Ideally if you have a BI solution which holds DB, SSIS, SSAS, SSRS & PPS projects I would like to right click and execute a dependency analyser, stating what impact would have if I drop / rename a specific column. Has anyone else looked at it and what are your thoughts? ThanksSutha  

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• What happens to running processes when I lose a remote connection to a *nix box?

  - by David Marble

  I occasionally lose my remote SSH connection to my VPS. I use screen for long-running processes, but am wondering what happens to the processes I had running aside from those run within a screen session if I lose the connection to the box. When I re-establish a connection to the box, what happened to the bash and sshd processes that were running when I lost the connection? Today I lost connection repeatedly and noticed many more bash and sshd processes than usual. If there are processes hanging around, do I need to kill them? How could I determine which processes were abandoned from my previous session? Thanks for any replies!

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• Is there a LOGO interpreter that actually has a turtle?

  - by Tim Post

  This is not a repeat of the now infamous "How do I move the turtle in LOGO?" Recently, I had the following conversation with my five year old daughter: Daughter: Daddy, do you write programs? Me: Yes! Daughter: Daddy, what's a program? Me: A program is a set of instructions that a computer follows. Daughter: Daddy, can I write a program too? Me: Sure! This got me scrambling to think of a very basic language that a five year old could get some satisfaction from mastering rather quickly. I'm ashamed to admit that the first thing that came to mind was this: 10 INPUT "Tell me a secret" A$ 20 PRINT "Wow really? :" A$ 30 GOTO 10 That isn't going to hold a five year old's attention for very long and it requires too much of a lecture. However, moving a turtle around and drawing neat pictures might just work. Sadly, my search for a LOGO interpreter yielded noting but ad ridden sites, flight simulators and a whole bunch of other stuff that I really don't want. I'm hoping to find a cross platform (Java / Python) LOGO interpreter (dare I call it simulator?) with the following features: Can save / replay commands (stored programs) Has an actual turtle Sound effects are a plus Have you stumbled across something like this, if so, can you provide a link? I hate to ask a 'shopping' sort of question, but it seemed much better than "Is LOGO appropriate for a five year old?"

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• Remove iTunes on Mac OS X permanently: no Software Update

  - by ShreevatsaR

  Somewhat predictably, removing iTunes on Mac OS X is a long arduous process, described at http://support.apple.com/kb/ht1224 — which I have followed. As far as I can tell, I have purged every trace of the accursed iTunes from my system. Yet Software Update repeatedly prompts me with updates for iTunes, which I don't want anything to do with, despite my saying "Not now" each time. How can I convince Software Update to leave me alone, and never bother me with mention of iTunes again? I'm on Mac OS X 10.6.4 Build 10F569, and the update being offerred is iTunes 9.2.1. (Note: Not a duplicate of OS X: why Software Update suggests to update removed application?, whose accepted answer is simply to follow the instructions I mentioned above.)

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• In Excel, given a worksheet "A", how do you create a sheet "B" that has a subset of the rows in "A"?

  - by user32706

  In Excel 2007, I have a sheet full of data "A". One of the columns in sheet "B" is called "Valid" and has either "yes" or "no". I've created a second sheet "B". It's easy to make each row in "A" appear in "B" if the row is valid using an 'if' statement in each cell. But if it's invalid, there's a blank row. I need "B" to show only the rows from "A" that are valid. TWO BIG CAVEATS: - No macros - No filtering (for long and complicated reasons). I feel like it might be possible with vlookup used cleverly, but so far, I'm stumped.

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• How to securely delete files stored on a SSD?

  - by Chris Neuroth

  From a (very long, but definitely worth to read) article on SSDs: When you delete a file in your OS, there is no reaction from either a hard drive or SSD. It isn’t until you overwrite the sector (on a hard drive) or page (on a SSD) that you actually lose the data. File recovery programs use this property to their advantage and that’s how they help you recover deleted files. The key distinction between HDDs and SSDs however is what happens when you overwrite a file. While a HDD can simply write the new data to the same sector, a SSD will allocate a new (or previously used) page for the overwritten data. The page that contains the now invalid data will simply be marked as invalid and at some point it’ll get erased. So, what would be the best way to securely erase files stored on a SSD? Overwriting with random data as we are used to from hard disks (e.g. using the "shred" utility) won't work unless you overwrite the WHOLE drive...

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• Import SSIS Project in Denali CTP1

  For years Analysis Services has had the ability to take an existing database from a server and reverse engineer it into a BIDS project.  This is extremely useful when all you have is the running instance of the database and the project that created it has long since disappeared.  Reverse engineering has never been a feature of SSIS until now. Let me walk you through the simple steps. The first step is that you obviously have to have a project deployed to an SSIS Catalog.  I will do a video on this soon but in case you can’t wait then my good buddy Jamie Thomson has written it up here As you can see I have a project called imaginatively “Denali1” with one package “Package.dtsx” The next thing we need to do is fire up BIDS and choose the right project type (Integration Services Import Project) Now we just follow the wizard.  We make sure we specify on which server to find the Catalog and in which folder to look for the project. Next the setting are validated and we are greeted with the familiar review screen before the creation of our new project from the deployed project happens Hit Import and away we go The result is just what we wanted.

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• Num Lock of laptop working strangely [Dell Vostro 1710]

  - by Bakhtiyor

  My laptop model is Dell Vostro 17" and it has numeric keypad. The problem is that its Num Lock key works very strange. Sometimes when I press it the information led of Num Lock activates, but sometimes when I try to activate numeric keypad it refuses and this led doesn't activate and therefore numeric keypad doesn't work at all. Does it mean that I need to change my keyboard at all? In addition Esc key doesn't work for a long time. I think the main reason for that is my son (2year old) who started playing with my laptop from his 1st year. If I need to change the keyboard where can I buy it for a good price, because in Dell I think when I called them 2-3 months ago they offered me keyboard for about more then 50Euros. Currently I live in Spain. Thanks.

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• Euler Problem 1 : Code Optimization / Alternatives [on hold]

  - by Sudhakar

  I am new bee into the world of Datastructures and algorithms from ground up. This is my attempt to learn. If the question is very plain/simple . Please bear with me. Problem: Find the sum of all the multiples of 3 or 5 below 1000. Code i worte: package problem1; public class Problem1 { public static void main(String[] args) { //******************Approach 1**************** long start = System.currentTimeMillis(); int total = 0; int toSubtract = 0; //Complexity N/3 int limit = 10000; for(int i=3 ; i<limit ;i=i+3){ total = total +i; } //Complexity N/5 for(int i=5 ; i<limit ;i=i+5){ total = total +i; } //Complexity N/15 for(int i=15 ; i<limit ;i=i+15){ toSubtract = toSubtract +i; } //9N/15 = 0.6 N System.out.println(total-toSubtract); System.out.println("Completed in "+(System.currentTimeMillis() - start)); //******************Approach 2**************** for(int i=3 ; i<limit ;i=i+3){ total = total +i; } for(int i=5 ; i<limit ;i=i+5){ if ( 0 != (i%3)) total = total +i; } } } Question 1 - Which best approach from the above code and why ? 2 - Are there any better alternatives ?

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• Multiple instances of Intellitrace.exe process

  - by Vincent Grondin

  Not so long ago I was confronted with a very bizarre problem… I was using visual studio 2010 and whenever I opened up the Test Impact view I would suddenly see my pc perf go down drastically…  Investigating this problem, I found out that hundreds of “Intellitrace.exe” processes had been started on my system and I could not close them as they would re-start as soon as I would close one.  That was very weird.  So I knew it had something to do with the Test Impact but how can this feature and Intellitrace.exe going crazy be related?  After a bit of thinking I remembered that a teammate (Etienne Tremblay, ALM MVP) had told me once that he had seen this issue before just after installing a MOCKING FRAMEWORK that uses the .NET Profiler API…  Apparently there’s a conflict between the test impact features of Visual Studio and some mocking products using the .NET profiler API…  Maybe because VS 2010 also uses this feature for Test Impact purposes, I don’t know… Anyways, here’s the fix…  Go to your VS 2010 and click the “Test” menu.  Then go to the “Edit Test Settings” and choose EACH test setting file applying the following actions (normally 2 files being “Local” and TraceAndTestImpact”: -          Select the Data And Diagnostic option on the left -          Make sure that the ASP.NET Client Proxy for Intellitrace and Test Impact option is NOT SELECTED -          Make sure that the Test Impact option is NOT SELECTED -          Save and close   Edit Test Settings   Problem solved…  For me having to choose between the “Test Impact” features and the “Mocking Framework” was a no brainer, bye bye test impact…  I did not investigate much on this subject but I feel there might be a way to have them both working by enabling one after the other in a precise sequence…  Feel free to leave a comment if you know how to make them both work at the same time!   Hope this helps someone out there !

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• How can I give a basic idea of what I'm working on to a non programmer?

  - by Jesse

  As a relatively new programmer (1 year professionally, many years as an amateur) I've run into many situations that sent me running to Stack Overflow for answers that failed my meagre experiences. Tonight I received the hardest question ever. My wife asked me: What are you working on? The questions is deceptive in it's simplicity. A straight forward and truthful answer of "I'm working on a c# class module for monitoring database delivery times" is sure incite suggestion of attempts to confuse. My second instinct was to suggest that it couldn't really be explained to a layperson, after very brief consideration I came to the conclusion that this would likely result in a long and sleepless night on the sofa. The end result was a muddled answer along the lines of "something to monitor automatic things to make sure they're delivered on time". The reception was fairly chilly, I had to make many assurances that I was not insulting her ample intelligence. My question is thus, what is the best way to discuss your work as a programmer with your significant other who is not.

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• Does RDNS for mail server have to match the mail server hostname exactly?

  - by threecheeseopera

  Typically when setting up a mail server, I create an rDNS record for the mail server IP to match the mail server hostname (ex: mail.example.com). Can I instead set the rDNS ptr to match the parent domain (e.g. example.com), if this server is being used for multiple purposes, and still send mail successfully (i.e. not be classified as spam b/c of mismatched rDNS)? Thanks! EDIT: The article at http://en.wikipedia.org/wiki/Forward_Confirmed_reverse_DNS seems to indicate that it might be more complicated than I had thought. For instance, 1) I did not know that you could have multiple PTR records for a given IP; 2) it appears that as long as each PTR record matches an A record, everything is good (basically nullifying my question). Would you agree?

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• MySQL on Windows - how do I set the wait_timeout for connections using named pipes?

  - by gustafc

  I use a MySQL database running on a Windows box, and for performance reasons I'm connecting to it using named pipes. The (Java) application using the database (through Hibernate) can let the connection lie idle for quite a long time, which causes the connection to fail with the following message: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 33 558 297 milliseconds ago. The last packet sent successfully to the server was 33 558 297 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. autoReconnect unfortunately has no effect (and neither does autoReconnectForPools), but the wait_timeout docs state that wait_timeout only applies "to TCP/IP and Unix socket file connections, not to connections made via named pipes, or shared memory". How can I change the wait_timeout for named pipes?

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• Windows Updates settings issue!

  - by Kumi

  Hi, it's my first post here, don't wanna make it long, but I got a problem with my 'Windows Update' it won't show its setting's options. It only shows these settings: Important Updates, Recommended Updates and Who can install updates, it removed the other setting sections like 'Microsoft Updates' "Give me updates for Microsoft products and check for new optional Microsoft software when I update windows" or the last settings section 'Software notification' "Show me detailed notifications when new Microsoft software is available" Here's a screenshot of my Windows Update: http://img96.imageshack.us/img96/1963/windowsupdatescreenshot.png And here's how it was before and how should be: h**p://www.sevenforums.com/attachments/tutorials/3523d1242168648-windows-update-settings-change-wu_settings.jpg Thanks. PS: I'm running windows 7 RTM

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• ASP.NET, PostgreSQL, Mono, Ubuntu, Apache: Good idea?

  - by wreck_of_u

  I am a long-time Microsoft .NET developer. ASP.NET/MSSQL/IIS has been my bread & butter over the past 6 years. Now, I'm getting fond of the "lightweightness" of Ubuntu 10.xx server. I'm also loving SSH-ing it from my Windows 7 PC and installing apps using the awesome "apt-get" command. I've also been using HeidiSQL with MySQL now and loving it. It feels like Management Studio. However, i've read that PostgreSQL "may" be better than MySQL, and I did experience some MySQL overloads in my Moodle box (but this can be just a poor tweaking in my part). My question is, would it be a good idea to run this configuration? ASP.NET 4.0 PostgreSQL (the latest one I can apt-get!) Ubuntu 10.10 with Mono running on Apache Also, I assume I would be using Npgsql for Mono as my connector from ASP.NET to PostgreSQL?

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• Graduate expectations versus reality

  - by Bobby Tables

  When choosing what we want to study, and do with our careers and lives, we all have some expectations of what it is going to be like. Now that I've been in the industry for almost a decade, I've been reflecting a bit on what I thought (back when I was studying Computer Science) programming working life was going to be like, and how it's actually turning out to be. My two biggest shocks (or should I say, broken expectations) by far are the sheer amount of maintenance work involved in software, and the overall lack of professionalism: Maintenance: At uni, we were all told that the majority of software work is maintenance of existing systems. So I knew to expect this in the abstract. But I never imagined exactly how overwhelming this would turn out to be. Perhaps it's something I mentally glazed over, and hoped I'd be building cool new stuff from scratch a lot more. But it really is the case that most jobs are overwhelmingly maintenance, bug fixing, and support oriented. Lack of professionalism: At uni, I always had the impression that commercial software work is very process-oriented and stringently engineered. I had images of ISO processes, reams of technical documentation, every feature and bug being strictly documented, and a generally professional environment. It came as a huge shock to realise that most software companies operate no differently to a team of students working on a large semester-long project. And I've worked in both the small agile hack shop, and the medium sized corporate enterprise. While I wouldn't say that it's always been outright "unprofessional", it definitely feels like the software industry (on the whole) is far from the strong engineering discipline that I expected it to be. Has anyone else had similar experiences to this? What are the ways in which your expectations of what our profession would be like were different to the reality?

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• Benchmarks relevant for a Visual Studio .Net development workstation

  - by user30715

  I am developing a system with Windows 7-64, Visual Studio and Sharepoint on a virtual workstation on some kind of VMWare server. The system is painfully slow, with VS lagging behind when entering code, Intellisense lagging, opening and saving files takes ages when compared to a normal budget laptop. As far as I can see the virtual machine has OK specs and does not seem to be swapping etc., and the IT dept also says that they can't see anything wrong when they're monitoring the system. As long as the problem is not well-documented, the IT dept and management does not want to throw money (=upgraded laptops) at us, so I need to show some sort of benchmark. It has been many years since I did any system benchmarking, and I don't know the current benchmark software, so my question is which benchmark will be most relevant for Visual Studio performance? Not just for compiling fast, but also to reflect the "responsiveness" of the system. Cheers, user30715

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• Ubuntu login takes 15 seconds, "I/O error dev fd0 sector 0"

  - by Dan

  After upgrading to Ubuntu 10.04, when I first login it takes 10+ seconds where it just sits at the gdm backgroup before taking me to gnome. By switching to a terminal window during this 10 seconds I saw the error message "I/O error /dev/fd0 sector 0" being outputted. I assume this has to do with the floppy drive... but I don't even have a floppy drive! How do I disable this device and make this error message go away (and hopefully fix the long wait)? Thanks.

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• How does the build quality of laptops compare?

  - by pgwillia

  I'm looking to replace my 5 year old laptop. I want my next laptop to endure at least this long. I typically have Thunderbird, Firefox, Eclipse Java IDE, Skype, a ssh session, and Apache Tomcat running. I'm currently running Karmic Ubuntu, but am agnostic about operating system and would move to Win 7 or OS X. I frequently travel with this computer. I also value battery longevity and power conservation (if possible). Above all I'm looking to minimize cost. I think the hardware that best meets my needs is an Intel i7 processor, 8 GB RAM, 100GB @7200 rpm or SSD hardrive, and about 15 inch monitor. These specs are met by most brands. Does anyone know specific pros/cons and build quality for Macbook Pro, Lenovo Thinkpad (W510 or T510), Sony's VPC-F1190, and ASUS G Series G73JH-X1 NoteBook? Are all i7 processors created equal? Do you have other suggestion that meet my needs?

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• How does eMail encryption work?

  - by Dummy Derp

  I have been going over YouTube watching videos on eMail encryption and everyone seems to explain it from a different perspective. Some do it for a CompTIA exam while others just provide a primer. Here is what I understood: Step1: You compose an email that you want to send. Without encryption, it will be simple ASCII text that will be visible to anyone along the way. Step2: You generate a digital signature to make sure that nobody gets to re-transmit your email and claim it was you. Digital Signature is generated using Sender's private key which is usually a hash of the password and is then combined with the original message to form one long hash string. These signatures are one-time-use-only and a new one is calculated for every email. Step 3: You encrypt the compose of your email using Receiver's public key so that the only person who can read it is the intended receiver using their private key Step 4: When you hit the send the email, what is transmitted now is gibberish to everyone apart from the intended receiver who will decrypt is using their private key And there are various ways to do it like PEM, PGP, etc. Correct me where I am wrong or refine where necessary.

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