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  • Java servlet and JSP accessing the same session bean

    - by Mykola Golubyev
    Let's say I have simple Login servlet that checks the passed name and creates User object and stores it in a session. User user = new User(); user.setId(name); request.getSession().setAttribute("user", user); response.sendRedirect("index.jsp"); In the index.jsp page I access the user object through jsp:useBean <jsp:useBean id="user" scope="session" class="package.name.User"/> <div class="panel"> Welcome ${user.id} </div> It works so far. The question: is this a valid usage or it is just current implementation uses the same name as the jsp bean id when stores and looks for a bean in a session?

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  • Assign a Custom Global Pseudo Variable in Code Igniter

    - by Fábio Antunes
    Hello As you probably all know Code Igniter can assign pseudo variables using the Parser library, but you also know that if we want to assign a Pseudo Variable to use it in a View, we have to do it in every do it in every controller that loads those views with the pseudo variables. I would like to know if Code Igniter 1.7.2 has some way that i can assign a Global Pseudo variable (like the pseudo variables from the Benchmarking Class). The pseudo variables i want, would have simple data mostly returned from the $config array in the config.php file. If some could help me with that. Regards.

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  • sscanf + c99 not working on some platforms ?

    - by Jane
    When I compile a simple Hello World! program that uses the sscanf function on my local Debian lenny x64, it works. But when I upload the same program to the server running CentOS x86, it will not work. If I do not use sscanf, then the program works on both computers. gcc -std=c99 -O2 -pipe -m32 If I compile it with sscanf but without -std=c99, then it works on both computers. gcc -O2 -pipe -m32 What is the problem with sscanf and c99 on CentOS x86 ? I thought that compiling with the -m32 flag would work on all Linuxes ? (I have limited access to the CentOS server, so I do not have access to error messages.)

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  • Dictionary with delegate or switch?

    - by Samvel Siradeghyan
    Hi, I am writing a parser, which call some functions dependent on some value. I can implement this logic with simple switch like this switch(some_val) { case 0: func0(); break; case 1: func1(); break; } or with delegates and dictionary like this delegate void some_delegate(); Dictionary<int, some_delegate> some_dictionary = new Dictionary<int, some_delegate>(); some_dictionary[0] = func0; some_dictionary[1] = func1; some_dictionary[some_value].Invoke(); Are this two methods equal and which is preferred? Thanks.

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  • How to the view count of a question in memory?

    - by Freewind
    My website is like stackoverflow, there are many questions. I want to record how many times a question has been visited. I have a column called "view_count" in the question table to save it. If a user visits a question many times, the view_count should be increased only 1. So I have to record which user has visited which question, and I think it is too much expensive to save this information in the database because the records will be huge. So, I would like to keep the information in memory and only persist the number to the database every 10 minutes. I have searched about "cache" in Rails, but I haven't found an example. I would like a simple sample of how to do this, thanks for help~

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  • Visualizing an AST created with ANTLR (in a .Net environment)

    - by Benjamin Podszun
    Hi there. For a pet project I started to fiddle with ANTLR. After following some tutorials I'm now trying to create the grammar for my very own language and to generate an AST. For now I'm messing around in ANTLRWorks mostly, but now that I have validated that the parse tree seems to be fine I'd like to (iteratively, because I'm still learning and still need to make some decisions regarding the final structure of the tree) create the AST. It seems that antlrworks won't visualize it (or at least not using the "Interpreter" feature, Debug's not working on any of my machines). Bottom line: Is the only way to visualize the AST the manual way, traversing/showing it or printing the tree in string representation to a console? What I'm looking for is a simple way to go from input, grammar - visual AST representation a la the "Interpreter" feature of ANTLRWorks. Any ideas?

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  • Dictionary with delegate or swith?

    - by Samvel Siradeghyan
    Hi, I am writting a parser, which call some functions dependent on some value. I can implement this logic with simple switch like this swith(some_val) { case 0: func0(); break; case 1: func1(); break; } or with delegates and dictinary like this delegate void some_delegate(); Dictinary some_dictinary = new Dictinary(); some_dictinary[0] = func0; some_dictinary[1] = func1; some_dictinary[some_value].Invoke(); Are this two metods equal and wich is prefered? Thanks.

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  • Calculate broadcast address from ip and subnet mask

    - by Kolja
    Hi I want to calculate the broadcast address for e.g -IP 192.168.3.1 -Subnet 255.255.255.0 =192.168.3.255 in C. I know the way (doing fancy bitwise OR's between the inversed IP and Subnet), but my problem is I come from the green fields of MacOSX Cocoa programing. I looked into the source of ipcal, but wasn't able to integrate it into my code base. There must be a simple 10 line of code example somewhere on the internet, I just can't find it. Could someone point me to a 10 line of code example of how to do it in C. Cheers, Kolja

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  • How do I use Python's itertools.groupby()?

    - by James Sulak
    I haven't been able to find an understandable explanation of how to actually use Python's itertools.groupby() function. What I'm trying to do is this: take a list - in this case, the children of an objectified lxml element - divide it into groups based on some criteria, and then later iterate over each of these groups separately. I've reviewed the documentation (http://docs.python.org/lib/itertools-functions.html), and the examples, (http://docs.python.org/lib/itertools-example.html), but I've had trouble trying to apply them beyond a simple list of numbers. So, how do I use of itertools.groupby()? Is there another technique I should be using? Pointers to good "prerequisite" reading would also be appreciated.

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  • trouble configuring WCF to use session

    - by Michael
    I am having trouble in configuring WCF service to run in session mode. As a test I wrote this simple service : [ServiceContract] public interface IService1 { [OperationContract] string AddData(int value); } [ServiceBehavior(InstanceContextMode=InstanceContextMode.PerSession)] internal class Service1 : IService1,IDisposable { private int acc; public Service1() { acc = 0; } public string AddData(int value) { acc += value; return string.Format("Accumulator value: {0}", acc); } #region IDisposable Members public void Dispose() { } #endregion } I am using Net.TCP binding with default configuration with reliable session flag enabled. As far as I understand , such service should run with no problems in session mode. But , the service runs as in per call mode - each time I call AddData , constructor gets called before executing AddData and Dispose() is called after the call. Any ideas why this might be happening?

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  • Objective-C initial values of created C-array

    - by kpower
    I create an array, similar to classic C (not NSArray or one of it's children) - something like BOOL i[5];. And I want to make all its values to be equal to NO. First of all, I didn't found any information about initial values of such arrays (I know that in classic C they will be undefined, but don't know exactly about Objective-C. I found info about classes and its inner data [after allocation, without initialization], but not about simple data types). And the second, if I should set array values manually - should I use memset(...); or something different? To prevent possible questions... I want to use this construction as array of temporary boolean flags and don't think that it is proved to use something like NSArray here.

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  • [three20] dynamically add Items to TTLauncher

    - by choise
    Hi guys, in my app i got a TTLauncher Object with some TTLauncherItems in it. Now i want to add some Items dynamically inside my App by pressing a button. Is there a simple way to do that or do i have to create my own methods? In the original facebook application there is already something like that implemented. (You can add your Friends to the Launcher) If not, what would be the best thing to do something like that? Store all "extra items" in a plist oder even in a database and query them, each time TTLauncher object is initialized? Thanks for help :)

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  • What event do I need to supress to stop IE from "Dinging" when I press enter in a text box?

    - by scunliffe
    On simple forms with one text box pressing enter submits the form (and this is great for easy search forms) However on a form with multiple fields, pressing Enter in an input="text" box won't do anything (e.g. submit) but in IE it "Dings" as if you have tried to delete an undeletable object. The question is... what event do I need to suppress in IE to stop this sound? e.g. if I have a username/password form, I DO want the enter key to submit the form, but I certainly don't want the "error" sound. Example site with the sound: http://www.sears.com/shc/s/StoreLocatorView?storeId=10153&catalogId=12605 Just press Enter in any of the text fields. Ding!, Ding!, Ding! Non-IE users, the sound is the: Program Events Windows Default Beep ("Windows XP Ding.wav")

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  • How to modyfy resource in a DLL from this DLL?

    - by CichyK24
    I'm writing an add-on for IE using VC++ and ATL. It's a simple DLL and I have a text file that I use as a resource. This answer helped me in doing this. I have a question about updating resource. MSDN describes how to do it but there is a function (BeginUpdateResource) that need filename of exe or dll with resource. Is it possible to update resource in my DLL from my DLL? I can easily read it that way, but to update I have to provide DLL's name. Is it necessary? Also if I won't give full path to my DLL it looks for file on desktop and not where DLL is stored. I don't know why this behave like this.

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  • Programmatically Centering UIViews

    - by David Foster
    I've seen a bunch of similar questions to this, but nothing seems to be completely what I'm looking for. Do forgive me if I have missed the solution answered in another question, though! Right. I have a view. 160 pixels both tall and wide. I know that this view is going to be used as a subview, and I know that it always needs to be centered about both axis in whatever situation it's used. If defining the view programmatically, how can I be sure that it is always perfectly centered, horizontally and vertically, relative to its superview? So far, all I have is this simple code: - (void)loadView { self.view = [[UIView alloc] initWithFrame:CGRectMake(80, 150, 160, 160)]; self.view.backgroundColor = [UIColor greenColor]; self.view.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin); [self.view release]; } This does the centralization, but only in the simplest of cases. Any insight is greatly appreciated.

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  • HttpWebRequest socket operation during WPF binding in a property getter

    - by wpfwannabe
    In a property getter of a C# class I am doing a HTTP GET using HttpWebRequest to some https address. WPF's property binding seems to choke on this. If I try to access the property in a simple method e.g. Button_Clicked, it works perfectly. If I use WPF binding to access the same property, the app seems to be blocked on a socket's recv() method indefinitely. Is it a no-no to do this sort of thing during binding? Is app in some special state during binding? Is there an easy way for me to overcome this limitation and still maintain the same basic idea?

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  • AJAX, PHP, XML, and cascading drop-down lists

    - by Dave Jarvis
    What PHP libraries would you recommend to implement the following: Three dependent drop-down lists Three XML data sources AJAX-based Essentially, I'd like to create an XML database and wire up a form that allows the user to select three different dependent parameters: User clicks Region User clicks District (filtered by Region) User clicks Station (filtered by District) Even though I would like to use PHP and XML, the general problem is: One XHTML form Three dependent, cascading drop-down lists Three flat files (no relational database) for the list data The solution must be efficient, simple, reliable, and cross-browser. What technologies would you recommend to solve the problem? Thank you!

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  • WPF Data virtualizing ListView

    - by Robert Jeppesen
    In our current WinForms app, we are displaying millions of records in ListView, using virtualization. Rows are loaded from DB as they are requested. This works well, with good performance. This is a showstopper for migrating to WPF for us. We need data virtualization in a ListView, like WinForms 2.0 has. Do you know a decent third-party control, or a relatively easy way of doing it with built-in controls? It doesn't need to be a DataGrid, a simple ListView will suffice. Note, I'm note talking about UI virtualization, it's data virtualization.

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  • Putting Images Inside a BUTTON Element (HTML & CSS)

    - by Jimbo
    I have a simple button (as shown below) on which I need to display two pictures, one on either side of the button text. Im battling to create the CSS that will work in both Firefox and Internet Explorer! (the button images are coming from a JQuery UI skin file) CSS button div{ width:16px; height:16px; background-image: url(images/ui-icons_d19405_256x240.png); } button div.leftImage{ background-position: -96px -112px; float: left; } button div.rightImage{ background-position: -64px -16px; float: right; } HTML <button><div class="leftPic"></div><span>Button Text</span><div class="rightPic"></div></button>

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  • How to secure licensekey generation

    - by Jakob Gade
    Scenario, simplified for brevity: A developer creates an application for a customer. The customer sells this app to end-users. The app requires a license key to run, and this key is generated by the customer for each end-user with a simple tool created by the developer. The license key contains an expiry date for the license and is encrypted so the end-user can’t tamper with it. The problem here is that the developer (or anybody who has a copy of the license key generator) can easily create valid license keys. Should this generator fall into the wrong hands, it could spell disaster for the customers business. Ideally, the customer would have to use a password to create new license keys. And this password would be unknown to the developer, and somehow baked into the decryption algorithm in the application so it will fail if an attempt to use an unauthorized key is made. How would you implement a solution for this problem that is both transparent and secure?

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  • Counting number of children in hierarchical SQL data

    - by moontear
    for a simple data structure such as so: ID parentID Text Price 1 Root 2 1 Flowers 3 1 Electro 4 2 Rose 10 5 2 Violet 5 6 4 Red Rose 12 7 3 Television 100 8 3 Radio 70 9 8 Webradio 90 For reference, the hierarchy tree looks like this: ID Text Price 1 Root |2 Flowers |-4 Rose 10 | |-6 Red Rose 12 |-5 Violet 5 |3 Electro |-7 Television 100 |-8 Radio 70 |-9 Webradio 90 I'd like to count the number of children per level. So I would get a new column "NoOfChildren" like so: ID parentID Text Price NoOfChildren 1 Root 8 2 1 Flowers 3 3 1 Electro 3 4 2 Rose 10 1 5 2 Violet 5 0 6 4 Red Rose 12 0 7 3 Television 100 0 8 3 Radio 70 1 9 8 Webradio 90 0 I read a few things about hierarchical data, but I somehow get stuck on the multiple inner joins on the parentIDs. Maybe someone could help me out here. moon

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  • Best Installation Software?

    - by Chris
    I am interested in knowing what the best software would be to build an installation package that performs the following: (1) Installs client application (2) Detects all SQL server instances on network, allowing user to select specific database to upgrade (which would then upgrade database using an embedded SQL script) (3) Installs website on a server/location specified by user, and configures IIS 6.0 and/or 7.0 based on settings that I specify. (4) Creates a simple setup.exe - and allows user to choose installation components (listed above, i.e install client app, sql server database, and/or website), and then download selected components from remove server. I have tried NSIS - as was able to create an installation package that will download a compressed (gzip) component from a remote server, decompress the file, install the components, and then remove the gzip file. So, this worked beautifully. The part where I am stuck is to be able to perform the database upgrade and website install. Any suggestions would be great. Thanks. Chris

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  • Serving files inside of directories with ruby and mongrel

    - by AdamB
    I made a simple web server in Ruby using the Mongrel gem. It works great for files in a single directory, but I run into some path issues when inside a directory. Lets say we have 2 files in a directory named "dir1", "index.html" and "style.css". If we visit http://host/dir1/index.html, the file is found, but style.css isn't because it's trying to load "style.css" from http://host/style.css instead of inside the directory. index.html is trying to load style.css as if its in the same directory as itself. <link href="style.css" rel="stylesheet" type="text/css" /> I can get the file if I enter the full path of style.css: /dir1/style.css but it doesn't seem to remember it's already inside a directory and that no path before a filename should serve from the current directory. This is the ruby code im using to serve out files. require 'rubygems' require 'mongrel' server = Mongrel::HttpServer.new("0.0.0.0", "3000") server.register("/", Mongrel::DirHandler.new(".")) server.run.join

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  • A quick design question about C++ container classes in shared memory

    - by recipriversexclusion
    I am writing a simple wrapper around boost::interprocess's vector container to implement a ring buffer in shared memory (shm) for IPC. Assume that buf is an instance of RingBuffer created in shm. Now, in its ctor, buf itself allocates a private boost::interprocess::vector data member to store values, e.g. m_data. My question is: I think m_data should also be created in shared memory. But it this a necessity? What happens if buf that was created in shm itself, allocates standard memory, i.e. using new. Does this get allocated on the calling process's heap? I don't think buf is allocated there so how come a data member that is private to an object not on a process's heap gets allocated there. I'm confused.

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  • How to save the view count of a question in memory?

    - by Freewind
    My website is like stackoverflow, there are many questions. I want to record how many times a question has been visited. I have a column called "view_count" in the question table to save it. If a user visits a question many times, the view_count should be increased only 1. So I have to record which user has visited which question, and I think it is too much expensive to save this information in the database because the records will be huge. So, I would like to keep the information in memory and only persist the number to the database every 10 minutes. I have searched about "cache" in Rails, but I haven't found an example. I would like a simple sample of how to do this, thanks for help~

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