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  • how to copy char * into a string and vice-versa

    - by user295030
    If i pass a char * into a function. I want to then take that char * convert it to a std::string and once I get my result convert it back to char * from a std::string to show the result. I don't know how to do this for conversion ( I am not talking const char * but just char *) I am not sure how to manipulate the value of the pointer I send in. so steps i need to do take in a char * convert it into a string. take the result of that string and put it back in the form of a char * return the result such that the value should be available outside the function and not get destroyed. If possible can i see how it could be done via reference vs a pointer (whose address I pass in by value however I can still modify the value that pointer is pointing to. so even though the copy of the pointer address in the function gets destroyed i still see the changed value outside. thanks!

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  • How to add second project to the repository?

    - by Banani
    Hi! I have setup subversion 1.6.5 on Fedora. I have decided to use a single repository for multiple projects. I have added one project, projA, to the repository. I will have more projects to add to the repository in future. If I try to add next project with the command 'svn import . file:///path/to/repos' gives svn: File already exists: filesystem '/usr/local/svn-repos/proj-test/db', transa ction '1-1', path '/trunk'. The new projB is being added to the trunk directory of projA. I have read the section "Adding Projects" in http://svnbook.red-bean.com/en/1.1/ch05s04.html In that book, projects are added at once. But,I would like to add them one by one as new projects become ready to go. What is the proper command and/or how that can be done? Thanks. Banani

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  • Is it "legal" for C++ runtime to call terminate() when the C++ code is used inside some non-C++ prog

    - by sharptooth
    In certain cases - especially when an exception escapes a destructor during stack unwinding - C++ runtime calls terminate() which must do something reasonable post-mortem and then exit the program. When a question "why so harsh" arises the answer is usually "there's nothing more reasonable to do in such error situations". That sounds reasonable if the whole program is in C++. Now what if the C++ code is in a library and the program that uses the library is not in C++? This happens quite often - for example I might have a native C++ COM component consumed by a .NET program. Once terminate() is called inside the component code the .NET program suddenly ends abnormally. The program author will first of all think "I don't care of C++, why the hell is this library make my program exit?" How do I handle the latter scenario when developing libraries in C++? Is it reasonable that terminate() unexpectedly ends the program? Is there a better way to handle such situations?

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  • JSF Rendering Issue (Page getting cached)

    - by Shamik
    I am facing a strange issue with JSF. I have developed one controller and bind it to request scope. I need to access one jsf page like http://localhost:8080/selectRule.jsf?type=A and on the same IE session I want to issue another request like http://localhost:8080/selectRule.jsf?type=B as we can see, only the type is changing here. This is why I have a ruleController bound to request scope, so that every request, creates the controller and pulls out the data depending upon type. I have a private HtmlSelectOneMenu choices item in the page. What I see is, somehow only once in the session the getChoices() is getting called. This is what I see For each url, one new ruleController object is getting created. Only first time getChoices() are called. In the subsequent time, if I change the URL in the web browser, the getChoices() method are not getting called though a new controller is getting created. Note: I am using JSF 1.1

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  • make db connection persistent throught zend framework

    - by kamikaze_pilot
    I'm using zend framework. currently everytime I need to use the db I go ahead and connect to the DB: function connect(){ $connParams = array("host" => $host, "port" => $port, "username" => $username, "password" => $password, "dbname" => $dbname); $db = new Zend_Db_Adapter_Pdo_Mysql($connParams); return $db } so I would just call the connect() function everytime I need to use the db My question is...suppose I want to reuse $db everywhere in my site and only connect once in the very initial stage of the site load and then close the connection right before the site gets sent to the user, what would be the best practice to accomplish this? Which file in Zend should I save $db in, what method should I use to save it (global variable?), and which file should I do the connection closing in?

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  • ASP.NET C# Application Object Getters and Setters

    - by kellax
    I have had a hard time finiding a newbie friendly example of accessing Application Object. I have few things ( arrays ) i would like to store in Application Object to keep as persistant data for about 2h till AppRecycle Anyhow i know how to set an Application Object variable this way: // One way String[] users = new String[1000]; Application["users"] = users; // Another way Application.Add("users", users); However i do not know how to access these variables once in Application Object there is a Getter method Get however it requires int index and other one Contents which get's everything. Here i try to retrive my String[] array but gives me a error that i am trying to convert Object to String. String[] usersTable = Application["users"]; // Since this is an object i also tried Application.users but gives error

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  • Best way to search for a saturation value in a sorted list

    - by AB Kolan
    A question from Math Battle. This particular question was also asked to me in one of my job interviews. " A monkey has two coconuts. It is fooling around by throwing coconut down from the balconies of M-storey building. The monkey wants to know the lowest floor when coconut is broken. What is the minimal number of attempts needed to establish that fact? " Conditions: if a coconut is broken, you cannot reuse the same. You are left with only with the other coconut Possible approaches/strategies I can think of are Binary break ups & once you find the floor on which the coconut breaks use upcounting from the last found Binary break up lower index. Window/Slices of smaller sets of floors & use binary break up within the Window/Slice (but on the down side this would require a Slicing algorithm of it's own.) Wondering if there are any other way to do this.

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  • Distance between hyperplanes

    - by michael dillard
    I'm trying to teach myself some machine learning, and have been using the MNIST database (http://yann.lecun.com/exdb/mnist/) do so. The author of that site wrote a paper in '98 on all different kinds of handwriting recognition techniques, available at http://yann.lecun.com/exdb/publis/pdf/lecun-98.pdf. The 10th method mentioned is a "Tangent Distance Classifier". The idea being that if you place each image in a (NxM)-dimensional vector space, you can compute the distance between two images as the distance between the hyperplanes formed by each where the hyperplane is given by taking the point, and rotating the image, rescaling the image, translating the image, etc. I can't figure out enough to fill in the missing details. I understand that most of these are indeed linear operators, so how does one use that fact to then create the hyperplane? And once we have a hyperplane, how do we take its distance with other hyperplanes?

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  • C# Linq: Can you merge DataContexts?

    - by Andreas Grech
    Say I have one database, and this database has a set of tables that are general to all Clients and some tables that are specific to certain clients. Now what I have in mind is creating a primary DataContext that includes only the tables that are general to all the clients, and then create separate DataContexts that contain only the tables that are specific to the client. Is there a way to kind of "merge" DataContexts so that it becomes one context? So for Client A, I need one DataContext that includes both the general tables and also the tables for that specific client (retrieved from two different DataContexts) ? [Update] What I think I can do is, from the Partial Class of the DataContext instead of letting my DataContext inherit from DataContext I make it inherit from MyDataContext; that way, the tables from MyDataContext and the other DataContext will be available in one DataContext class. What do you think about this approach? Of course with something like this you can only merge two datacontexts at once though...

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  • How do I list all cron jobs for all users?

    - by yukondude
    Is there a command or an existing script that will let me view all of a *NIX system's scheduled cron jobs at once? I'd like it to include all of the user crontabs, as well as /etc/crontab, and whatever's in /etc/cron.d. It would also be nice to see the specific commands run by run-parts in /etc/crontab. Ideally, I'd like the output in a nice column form and ordered in some meaningful way. I could then merge these listings from multiple servers to view the overall "schedule of events." I was about to write such a script myself, but if someone's already gone to the trouble...

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  • How do I make a UIAlertView happen only on the first start-up of an iPhone app?

    - by user309245
    I'm using the UIAlertView to make a pop-up happen once the app has started up. It works fine but I only want the pop up to happen on the first start-up of the app. At the moment I've got the UIAlertView in the AppDelegate class, after the application didFinishLaunching. Here is my code at the moment. - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { sleep(4); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Welcome!" message:@"SAMPLE!!!" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; I'm new to app development so sorry if this is simple. Thanks in advance! :)

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  • How can I deal with the ICE60 warning in WiX?

    - by Scott Boettger
    Good Afternoon, I have created a WiX project that installs a bunch of different EXEs and DLLs. Unfortunatly when I build the project I receive the following warning for each one of them: ICE60: The file fileName is not a Font, and its version is not a companion file reference. It should have a language specified in the Language column. I have found examples and possible solutions for this and each time it is suggested to set the DefaultLanguage tag to 0 in order to fix the warning. Once doing that I then get this warning: The DefaultLanguage '0' was used for file 'fileName' which has no language or version. For unversioned files, specifying a value for DefaultLanguage is not neccessary and it will not be used when determining file versions. Remove the DefaultLanguage attribute to eliminate this warning. So this leads me to the question of how can I handle this warning? Thanks in advance for any and all help given.

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  • Active Record Associations: has_one :through? Or multiple has_one's?

    - by jmccartie
    I'm brand new to Rails, so bear with me. I have 3 models: User, Section, and Tick. Each section is created by a user. My guess with this association: class Section < ActiveRecord::Base has_one :user end Next, each user can "tick" off a section -- only once. So for each tick, I have a section_id, user_id, and timestamps. Here's where I'm stuck. Does this call for a "has_one :through" association? If so, which direction? If not, then I'm way off. Which association works here? Thanks!

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  • Ruby and Rails Async

    - by Edijs Petersons
    I need to perform long-running operation in ruby/rails asynchronously. Googling around one of the options I find is Sidekiq. class WeeklyReportWorker include Sidekiq::Worker def perform(user, product, year = Time.now.year, week = Date.today.cweek) report = WeeklyReport.build(user, product, year, week) report.save end end # call WeeklyReportWorker.perform_async('user', 'product') Everything works great! But there is a problem. If I keep calling this async method every few seconds, but the actual time heavy operation performs is one minute things won't work. Let me put it in example. 5.times { WeeklyReportWorker.perform_async('user', 'product') } Now my heavy operation will be performed 5 times. Optimally it should have performed only once or twice depending on whether execution of first operaton started before 5th async call was made. Do you have tips how to solve it?

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  • git divergent renaming

    - by pablo
    Hi, I'd like to know how you handle a situation like this in Git: create branch task001 from master master: modify foo.c and rename it to bar.c task001: modify foo.c and rename it to moo.c merge task001 to master What Git tells me is: CONFLICT (rename/rename): Rename "foo.c"->"bar.c" in branch "HEAD" rename "foo.cs"->"moo.c" in "task001" Automatic merge failed; fix conflicts and then commit the result. How should I solve it? I mean, I still want to merge the two files once the name conflict is resolved. Thanks.

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  • jquery animating different img widths

    - by romeozor
    Hi there, I've been searching for an answer for a long time with no avail, so it's time to ask. I'm trying to use .animate() to change the size of an image once clicked. The first state of the image would be a thumbnail size, which would animate to the image's original size, then to a thumbnail again. The problem is, not all the images have the same "original" size so I need a way to tell one generic function to switch to the current image's original size. This is my current code which loads on $(window).load: $('img[class=resize]').click(function (){ if ($(this).width() != 150) { $(this).animate({width: '150px'}, 400); } else { $(this).animate({width: ''}, 400); } }); Now this obviously doesn't work the way I want it, because .animate() thinks when I say width: '' I want to make the width = 0. Any suggestions how I should go about this?

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  • Spring & Hibernate SessionFactory - recovery from a down server

    - by MJB
    So pre spring, we used version of HibernateUtil that cached the SessionFactory instance if a successful raw JDBC connection was made, and threw SQLException otherwise. This allowed us to recover from initial setup of the SessionFactory being "bad" due to authentication or server connection issues. We moved to Spring and wired things in a more or less classic way with the LocalSessionFactoryBean, the C3P0 datasource, and various dao classes which have the SessionFactory injected. Now, if the SQL server appears to not be up when the web app runs, the web app never recovers. All access to the dao methods blow up because a null sessionfactory gets injected. (once the sessionfactory is made properly, the connection pool mostly handles the up/down status of the sql server fine, so recovery is possible) Now, the dao methods are wired by default to be singletons, and we could change them to prototype. I don't think that will fix the matter though - I believe the LocalSessionFactoryBean is now "stuck" and caches the null reference (I haven't tested this yet, though, I'll shamefully admit). This has to be an issue that concerns people.

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  • Please clarify a few points concerning Java Servlets

    - by EugeneP
    suppose, I use Tomcat as a web container. Is it true that once all the servlets found in a web-app/WEBAPPNAME are init(IALIZED) then every change of a Servlet's property will be seen to every session. So session 1 changes a property userName of a Servlet1 from "user1" to "user2" session 1 is closed. session 2 starts. It will see "user2" as the only value of Servlet1.userName property?? Any change of a Servlet's field will be seen to all subsequent sessions? Are servlets singletons, aren't they?

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  • Calculating percentiles in Excel with "buckets" data instead of the data list itself

    - by G B
    I have a bunch of data in Excel that I need to get certain percentile information from. The problem is that instead of having the data set made up of each value, I instead have info on the number of or "bucket" data. For example, imagine that my actual data set looks like this: 1,1,2,2,2,2,3,3,4,4,4 The data set that I have is this: Value No. of occurrences 1 2 2 4 3 2 4 3 Is there an easy way for me to calculate percentile information (as well as the median) without having to explode the summary data out to full data set? (Once I did that, I know that I could just use the Percentile(A1:A5, p) function) This is important because my data set is very large. If I exploded the data out, I would have hundreds of thousands of rows and I would have to do it for a couple of hundred data sets. Help!

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  • Why does java have an interpreter? and not a compiler?

    - by Galaxin
    Iam a newbie to java and was wondering why java have a interpreter and not a compiler? While shifting from c++ to java we come across the differences between these two Compilation process being one of them. 1.A major difference between a compiler and interpreter is that compiler compiles the whole code at once and displays all the errors at a time whereas an interpreter interprets line by line. 2.Also a compiler takes a less time to compile a code when compared to an interpreter. When java was developed for more advanced and easy features and implementations why has it been restricted to a interpreter based on above facts? Is there any special reason why this is so? If yes what is it?

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  • How to structure web application with part of it being secured (SSL)

    - by spirytus
    What is the common pattern to structure web application where part of it has to be secured. So lets say I have page_a and page_b which do not need to be secured, although should display login information (login fields or login details once user logged in). This web app. also would have secured pages (admin, checkout or similar) secure_page_c and secure_page_d. My questions are: What is the common folder structure for such assuming I code in php with no frameworks? Also how shall I deal with session variables in case user navigates lets say from secure_page_b to non secure page_a or vice versa? What else might be a problem and should be considered when coding that kind of app in php? Thank you all for any suggestions

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  • Cascading Dropdown List

    - by user333831
    I am working on a web app and trying to code a form with two dropdown lists. The list in the second dropdown will be dependent on the selection from the first one. The task itself isn’t too complicated except that once the first selection is made, I need to make a database call to pull the data for the second dropdown. This is where I am having difficulty. Both lists are in fact populated from a database. I am working on this in a python script and have been trying to do this w/ an onChange javascript function. The web app is built in Zope and page templates may be an option along w/ the python scripts.

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  • Google Maps - Adsense ads not showing in Internet Explorer

    - by Spiros
    I am trying to display adsense ads on maps, but internet explorer gives me a hard time once again. The ads show on all other browsers I tried (chrome, ff, safari, opeara) but internet explorer. Has anyone encountered this before? here is my code for the admanager: var publisherID = 'ca-pub-6630823543717184'; var adsManagerOptions = { maxAdsOnMap : 1, style: 'adunit', channel: '5611474977' }; adsManager = new GAdsManager(map, publisherID, adsManagerOptions); adsManager.enable(); I am using xhtml1-strict doctype

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  • How to keep up the interest in job?

    - by stranger
    Hi, I have been working as Software Developer for 6+ yrs. And I have worked from start ups to big companies. I always feel some elements missing in me and those are interest, passion etc. In short, I don't feel motivated while coming to work. This makes me think how my work-life balance will look like once I reach at more responsible positions. I don't want to change my field and I feel blessed as well but I think I am not working passionately for my learning, future growth, improvement, skills etc. Any pointers will be highly appreciated. Thx

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  • need to run php script when form is submitted

    - by Brad
    I have a form that needs to run a php script once the submit button is clicked, it needs to be ajax. <form method="post" action="index.php" id="entryform" name="entryform"> <input type="submit" name="submit" value="Submit" onclick="JavaScript:xmlhttpPost('/web/ee_web/include/email-notification.php', 'entryform')" /> </form> In this situation, using if(form posted) { get results and run script } is not an option, I need to run the script externally, that is why I need it to execute the email-notification.php at onclick When I point my web browser to domain.com/include/email-notification.php - it runs perfectly. Any help is appreciated.

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