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• malloc hangs in Linux

  - by Rahul

  I am using Linux on a 16 G with 2 quad core CPU. There are 8 processes which are doing some work (CPU intensive/network i/o). Out of which 4 have a memory leak (These are test conditions so no problem in having leaks here). Total space is occupied by all processes is around 15.4 G only 200 MB is free in system. Things are fine for some hours. But after that malloc hangs (for a process which doesn't have a memory leak). Its stuck for for more than 4 minutes (Note CPU is not 100% but io has gone up signficantly). Now there is no problem in the hanged process. (It has not corrupted the memory). What malloc is doing? (is it tryibg to defragment or builidng up swap space).I am using SUSE 10. Any pointers?

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• How to deploy a c# application while including third party DLL's?

  - by Willem

  To start with, I don't know much of deployment. I hope my question makes sense. I need to install/deploy a c# application to a number of desktops. It needs a third-party DLL : a c++ library ("lpsolve55.dll", for those interested, it is a free MIP/LP solver, see lpsolve.sourceforge.net/5.5/). I use it in my code in the following way: [DllImport("lpsolve55.dll", SetLastError = true)] public static extern bool add_column(int lp, double[] column); For testing, I have manually copied the .dll file to to project\bin\release, it works fine. My question: I will need an installer for the application, which will manage that the .dll will install as well. I am considering clickonce deployment since I am using visual studio express (2008), but any not too expensive solution will do. What would you advice?

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• Java or Groovy CMS

  - by Don

  Hi, I'm considering developing a school information system using the Grails web framework. Before a school can use the system, they will need to setup the following data School data Students Teachers Subjects Classes etc. I'm considering using a CMS in order to get the ability to CRUD these entities "for free". The CMS may also provide other features out-of-the-box that I could use. Ideally the CMS should be implemented in Java or Groovy, does anyone know of something suitable? I looked at the Weceem CMS plugin for Grails, but it's missing some core concepts I need, e.g. the ability to add users to groups. Thanks, Don

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• MySQL with Java: Open connection only if possible

  - by emempe

  I'm running a database-heavy Java application on a cluster, using Connector/J 5.1.14. Therefore, I have up to 150 concurrent tasks accessing the same MySQL database. I get the following error: Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too many connections This happens because the server can't handle so many connections. I can't change anything on the database server. So my question is: Can I check if a connection is possible BEFORE I actually connect to the database? Something like this (pseudo code): check database for open connection slots if (slot is free) { Connection cn = DriverManager.getConnection(url, username, password); } else { wait ... } Cheers

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• What Windows Form control would be a good fit for this use case?

  - by Sergio Tapia

  I'm going create an open source Help desk solution free of charge for small to medium businesses to use. I'm currently working on the client application. I want to have a list of tickets that have been opened by the user. So it would be like a table TicketsByUser: Ticket Number | Type | Description | Date | Handled? 123456 | Hardware | My mouse broke | 10/20/2010 | No 123456 | Hardware | My mouse broke | 10/20/2010 | Yes I was thinking of using ListView because of it's name, but I have zero experience with it, so maybe it's not what I'm looking for. I'm going to be pulling the data from a WCF service which in turn pulls it from a MS SQL database.

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• What is the best method of assessment for computer science students?

  - by Gavimoss

  This question is a bit more philosophical so feel free to remove if you like but it's been bugging me for the last 4 years! As a final year student I find that exams can be often be passed with a couple of days of cramming, without necessarily retaining or understanding the content i.e. a regurgitation of lecture notes is often enough to gain high marks. A friend of mine is about to graduate with an honours degree whose final year evaluation was based solely on practical work (a project, assignment marks and the creation of a poster) yet all of this work could have been completed by a third party. Personally I don't think either of these methods of assessment is sufficient as I am currently on track for a 1st class honours in artificial intelligence and computer science and believe this is mostly due to my skill in passing exams not my skill as a programmer or my vast in depth knowledge of any of the subjects I have "studied". Surely there is a better way to assess our skills - isn't there?

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• How to make code run a certain amount of times before returning something?

  - by user3564967

  I made a trivia game and I have to make a method (SuccessOrFail) that will return whether the user beat the trivia or not. namespace D4 { /// <summary> /// Displays the trivia and returns whether the user succeeded or not, number of questions asked, and a free piece of trivia. /// </summary> public partial class TriviaForm : Form { private Trivia trivia; private Question question; private Random rand = new Random(); private HashSet<int> pickedQuestion = new HashSet<int>(); private string usersAnswer; private int numCorrectAnswers; private int numIncorrectAnswers; public TriviaForm() { InitializeComponent(); this.trivia = new Trivia(); QuestionRandomizer(); QuestionOutputter(); } /// <summary> /// This method will return true if succeeded or false if not. /// </summary> /// <returns>Whether the user got the trivia right or not</returns> public bool SuccessOrFail(bool wumpus) { bool successOrFail = false; int maxQuestions = 3; if (wumpus == true) maxQuestions = 5; int numNeededCorrect = maxQuestions / 2 + 1; if (this.usersAnswer == question.CorrectAnswer.ToString()) numCorrectAnswers++; else numIncorrectAnswers++; if (numCorrectAnswers + numIncorrectAnswers == maxQuestions) { if (numCorrectAnswers == numNeededCorrect) successOrFail = true; else successOrFail = false; numCorrectAnswers = 0; numIncorrectAnswers = 0; return successOrFail; } else return false; } /// <summary> /// This method will output a free answer to the player. /// </summary> public string FreeTrivia() { return question.Freetrivia; } // This method tells the player whether they were correct or not. private void CorrectOrNot() { if (this.usersAnswer == question.CorrectAnswer.ToString()) MessageBox.Show("Correct"); else MessageBox.Show("Incorrect"); } // Displays the questions and answers on the form. private void QuestionOutputter() { this.txtQuestion.Text = question.QuestionText; this.txtBox0.Text = question.Answers[0]; this.txtBox1.Text = question.Answers[1]; this.txtBox2.Text = question.Answers[2]; this.txtBox3.Text = question.Answers[3]; } // Clears the TextBoxes and displays a new random question. private void btnNext_Click(object sender, EventArgs e) { this.usersAnswer = txtAnswer.Text; CorrectOrNot(); this.txtQuestion.Clear(); this.txtBox0.Clear(); this.txtBox1.Clear(); this.txtBox2.Clear(); this.txtBox3.Clear(); this.txtAnswer.Clear(); this.txtAnswer.Focus(); QuestionRandomizer(); QuestionOutputter(); this.txtsuc.Text = SuccessOrFail(false).ToString(); } // Choose a random number and assign the corresponding data to question, refreshes the list if all questions used. private void QuestionRandomizer() { if (pickedQuestion.Count < trivia.AllQuestions.Count) { int random; do { random = rand.Next(trivia.AllQuestions.Count); } while (pickedQuestion.Contains(random)); pickedQuestion.Add(random); this.question = trivia.AllQuestions.ToArray()[random]; if (pickedQuestion.Count == trivia.AllQuestions.ToArray().Length) pickedQuestion.Clear(); } } } } My question is how to make it so that the code asks the user 3 or 5 questions and then returns whether the user won or not? I was wondering if somehow I could make a public void that would just make the form pop up and ask the user 3 to 5 questions and then once it asks the maximum number of questions, to close and then have a method that returns true if the user won, or false if they didn't. But I literally have no idea how to do that. Edit: So I know a for loop can make code run more than once. But the problem I'm having is, is that I don't know how to make it so that the trivia game asks 3 to 5 questions BEFORE returning something.

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• Is there a good collection library for C-language?

  - by matti

  We have to maintain and even develop C-code of our legacy system. Is there good collection library that would support Java/C# (new versions) style collections. Hashtable, HashSet, etc. Of course without objects, but with structs. The HashTable key limitations to "strings" and ints is not a problem. It wouldn't be bad if it's free even for commercial use. I'm back to C from C# and I must say i'm depressed using our own libraries and the language in general. We're using VS2005 and MS C-compiler if that has nothing to do with anything. Thanks & BR -Matti

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• Force Response to Download File(s) to Desktop with Ruby?

  - by viatropos

  I was thinking about making a little crop/resize batch processor online, and wanted to know if there was a way for me to do the following: upload image and specify dimensions click "process" and remote app resizes image image downloads automatically locally to wherever it was I uploaded it (say from my desktop), but with a new name (based on the time for example). This would make it so I could host a free image processor that never stored any data other than tempfiles. Is that possible? Something like Rails' send_file method, but I'm using Sinatra and am looking for something in pure ruby. What's the basic concept behind this? What if I wanted to do this for multiple files? Åssuming I can get multiple files uploaded no problem, how can I download all of them automatically?

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• Reporting. MS Word templates population required

  - by Andrew Florko

  Application we developed fills MS Word templates with data from Database. Customers require to have ability edit Word templates via MS Word (change style, font, layout e.t.c) with no additional software to be installed and no training. AFAIK, Sql Reporting Services and Crystal Reports can't populate MS Word templates produced in MS Word. So we implemented our custom solution that maps .net classes onto xml-saved MS Word documents. It looks like we declare class MyTemplate { // maps to [age] field declared in ms document straight in the text int Age { get; set; } // maps to table by attributes applied to property (omitted) List<Person> Persons { get; set; } } We also implemented images insertion. Are there any free libraries for this task or may be you use your own MS-word templators in your projects?

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• Can I program Nvidia's CUDA using only Python or do I have to learn C?

  - by Aquateenfan

  I guess the question speaks for itself. I'm interested in doing some serious computations but am not a programmer by trade. I can string enough python together to get done what I want. But can I write a program in python and have the GPU execute it using CUDA? Or do I have to use some mix of python and C? The examples on Klockner's (sp) "pyCUDA" webpage had a mix of both python and C, so I'm not sure what the answer is. If anyone wants to chime in about Opencl, feel free. I heard about this CUDA business only a couple of weeks ago and didn't know you could use your video cards like this. thx

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• Sql query builder c# for windows mobile

  - by pdiddy

  I'm building a windows mobile app. And using SqlCe. I'm looking for a good sql query builder. So instead of writing "SELECT COLUMNS FROM TABLE WHERE etc... Is there a good free library that can build this sort of query? EDIT: You know when you write your code with ADO.net something like this SqlCeCommand command = new SqlCeCommand(Connection); command.CommandText = "SELECT * FROM Orders WHERE customerId = @customerId"; Well i'm looking for some library that could build that SELECT statement using classes instead of writing it through string. So something like: SqlCeCommand command = new SqlCeCommand(Connection); SqlQueryBuilder query = new SqlQueryBuilder(); query.Table = "Orders"; query.AddWhere("customerId", myValue) command.CommandText = query.toString(); Something like that .... so a class that will build the query..

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• CSS - Overlapping divs

  - by Jens Törnell

  I have no code to start with. I want to add 2 divs overlapping on each other and then use the new CSS3 Rotate function. The effect I want to create is shown on this page Requirements I don't want to use images I don't mind using CSS3 It should be easy to align the whole thing in the center (which makes it harder to use position: absolute;). It's going to be content below the boxed content (which makes it harder to use position: absolute;). If it's possible without too much position: absolute; it's better. I prefer table free solutions. Have fun!

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• looking for a good vc++ profiler, already checked previous posts

  - by coreSOLO

  I'm looking for a good profiler for vs2008 professional edition, free or reasonably priced. I've already checked previous posts and tried about 8 profilers, but most of them are too basic or too detailed. Kindly suggest something, my requirements are as follows: It can be compiled, so that its well integrated with my application. I'm not shying away from instrumenting my methods. The output should be simple, i only need call count and time taken by methods and nothing else. I am mostly concerned about things INSIDE a method, you may call it line by line profiling. I want to select a method and know which line (expression / method call) is eating most of the time.

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• From a programmer's perspective, which is your everyday Python uses?

  - by Vimvq1987

  I've finished my thesis and now having a free time. I intend to learn another language, and Python seems to be a good choice. I'll probably have to use .NET for every day works, but I heard that Python helps programmer a lot, in mean of automation. That would be great if I can write "small" Python scripts to do something automatically. From a programmer's perspective, which is your everyday Python's uses? What did it do to have your works done?

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• Play mp3 stream from http URL on Windows Mobile 6.0

  - by Thyphuong

  After a short period of time learning about how to play a mp3 http url on windows mobile 6.0, I found that very less dll support that (until now, I just found out Bass.dll work nice). So I intend to change to another way to approach the goal. Here's my idea: Get a stream from http url. Decode the mp3 stream. Play the result from step 2. Coz I'm new on this field, so feel free and explain to me what I'm wrong and/or show me the way.

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• Is it possible to have SNMP Agent without MIB’s support??

  - by Divya mohan Singh

  hii, i am working on SNMP from last few days,i have develope a small application(SNMP Agent) which * Run on 161 port. * Have a tree structured OID support. * Respond to all Get,GetNext,Set Pdu Request types. * Tested with some SNMP Managers(free available) by get and set the values of the OID's. BUT,now question is when i tried it with Cacti it will not respond anything,but detect windows snmp service..it just respond to the requests of the SNMP Managers. So,Is it mandatory to provide mib with SNMP Agent??.

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• Error safe/correcting resource identifier

  - by Martin

  The receiver is my website, the sender is the same but the medium is noisy, a user. He will read an alphanumeric code of length 6 and later input the same code to identify a resource. A good use for a error correcting code, I thought, and rather than do the research I thought I'd just put the question out there. Or I might be going about it the wrong way, since the situation is rather like sending a perfect dictionary along with every transmission. The requirements on the code are simply: 6 alphanumeric digits, to start with until I run out, anyway. If the user gets it wrong I should still be able to identify the right resource. No resource is preferable to the wrong one. Easy to code or have free libraries for .net Any suggestions?

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• Microsoft Team System Equivalent stack.

  - by Nix

  I am looking for a free alternative to TS. What would be the best alternative stack(source control, bug tracking, project management/planning, wiki, automated builds (ci))? Keeping in mind that it would be nice if they all integrated well. For example, it would be nice to be able to link bugs to source control, and then be able to link to a project plan and then be able to automate building. I do not have issues with using Microsoft project to manage project planing. I know i would like to use these....: SVN TeamCity NUnit But i am struggling to find a good Wiki/Project Planning/Bug tracking, that would integrate well. Any questions let me know.

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• Floating Menu CSS/Javascript issues

  - by Ron Cassel

  I'm new to all this so thanks for being patient. Ok so I'm building a site with a Floating Javascript menu. The original code is from: Jtricks Absolute Floating Menu Here's the issue: When viewing the site in a mobile browser, zooming in initially caused the floating javascript menu to leave the far left of the page and cover content on the page. I fixed this by locking it into a fixed width div on the left side of the page. Now the issue I have is, I don't want the fancy animation of the javascript. A simple CSS script for a fixed window is fine. The only issue is, everything I've tried has done the same "free floating" thing when zoomed in on mobile browsers and I can't seem to find a fix. Anyone have any ideas?

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• Why does this bash command take up all space on device?

  - by chelmertz

  Hey! I'm a little new on searching via bash, so feel free to give me suggestions on the methods to use instead of this, which I'll never use again :) I'm searching for occurances of a string, recursively in a directory, with ~50 not-that-large php-files in it; some in current directory, some in directories beneath current dir, three levels of directories down at most. The method I'm using is: find . | xargs grep "module" > module.txt When in simple (one level) directories, this works fine, but in this case, the file became 4 GB large until it filled up all space on the partition :) It wasn't even done yet.. Would someone educate me so I won't embarass myself again?

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• Crystal Reports not included in Visual Studio 2010 – What are the consequences for the introduction

  - by Dirk

  Yesterday I stumbled over the information that Crystal Reports will no longer be included in Visual Studio 2010. Instead – it will be provided as a free download, but with a separate installation and a separate release date. According to the linked information the release of CR will be later than that of VS. My projects depend in parts on CR and I want to shift early to VS 2010. So there are some related questions: Can I use VS 2010 with the older 2008 version of CR? Do I need a workstation with a preinstalled VS 2008 or is the installation of the CR redistribution package sufficient to run that? Are there any experiences with the VS Beta concerning that?

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• SQL Server 2005 - Understanding ouput of DBCC SHOWCONTIG

  - by user169743

  I'm seeing some slow performance on a SQL Server 2005 database. I've been doing some research regarding SQL Server performance but I'm having difficulty fully understanding the output of SHOWCONTIG and would be very grateful if someone could have a look and offer some suggestions to improve performance. TABLE level scan performed. Pages Scanned................................: 19348 Extents Scanned..............................: 2427 Extent Switches..............................: 3829 Avg. Pages per Extent........................: 8.0 Scan Density [Best Count:Actual Count].......: 63.16% [2419:3830] Logical Scan Fragmentation ..................: 8.40% Extent Scan Fragmentation ...................: 35.15% Avg. Bytes Free per Page.....................: 938.1 Avg. Page Density (full).....................: 88.41%

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• Non-deprecated replacement for NSCalibratedBlackColorSpace?

  - by uliwitness

  I'm implementing my own NSBitmapImageRep (to draw PBM image files). To draw them, I'm using NSDrawBitmap() and passing it the NSCalibratedBlackColorSpace (as the bits are 1 for black, 0 for white). Trouble is, I get the following warning: warning: 'NSCalibratedBlackColorSpace' is deprecated However, I couldn't find a good replacement for it. NSCalibratedWhiteColorSpace gives me an inverted image, and there seems to be no way to get NSDrawBitmap() to use a CGColorSpaceRef or NSColorSpace that I could create as a custom equivalent to NSCalibratedBlackColorSpace. I've found a (hacky) way to shut up the warning (so I can still build warning-free until a replacement becomes available) by just passing @"NSCalibratedBlackColorSpace" instead of the symbolic constant, but I'd rather apply a correct fix. Anybody have an idea?

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• Why does placing this html within form tags change the layout?

  - by user352687

  I'm using this free Web Template - EliteCircle and have just incorporated it into a master page. The master page wraps the html in: <form id="form1" runat="server"> //master page html </form> The template almost comes out fine except the entire page is surrounded by a think white border (default CSS behavior for form?) and the footer background is half white on the very bottom. I wouldn't expect the form with id=form1 to change anything in the layout. There is nothing in the [CSS][2] with that id. When I remove the form tags from the master page (just to check) the layout is perfect, no problems. Any ideas? (Using Visual Web Developer 2008 Express) Thanks, Greg The CSS: http://www.styleshout.com/templates/preview/EliteCircle12/images/EliteCircle.css

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