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  • Web Services: more frequent "small" calls, or less frequent "big" calls

    - by Klay
    In general, is it better to have a web application make lots of calls to a web service getting smaller chunks of data back, or to have the web app make fewer calls and get larger chunks of data? In particular, I'm building a Silverlight app that needs to get large amounts of data back from the server in response to a query created by a user. Each query could return anywhere from a few hundred records to a few thousand. Each record has around thirty fields of mostly decimal-type data. I've run into the situation before where the payload size of the response exceeded the maximum allowed by the service. I'm wondering whether it's better (more efficient for the server/client/web service) to cut this payload vertically--getting all values for a single field with each call--or horizontally--getting batches of complete records with each call. Or does it matter?

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  • Java Logger with Servlets

    - by Sunny
    Hi Guys, I am using a wrapper class A which initializes the java.util.logger static class A { public static Logger logger; public static void init(){ logger = Logger.getLogger("test"); } Now, everywhere in my program I call A.init() and then logger.log("Message+uniqid"). But recently I moved to HTTP servlets and I am having problems. Basically, If a app is already running and the logger is logging... and someone else runs the app again, the logger from the previous instance stops and starts logging for the second one. Can anyone have a solution to how I should go about fixing this static variable issue? I can pass the logger into all constructor classes but thats really tedious. Any better solution would be appreciated..

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  • Detecting rotation to landscape manually

    - by Thomas Joos
    hi all, I am working on an iPhone application based on UITabBarController and UIViewControllers for each page. The app needs to run in portrait mode only, so every view controller + app delegate goes with this line of code: (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } There is one view controller where I would like to pop up a UIImageView when the iPhone is rotaed to landscapeleft. The design of the image looks landscape, although the width and height are 320x460 ( so its portrait ). How can/should I detect this type of rotation manually, just in this specific view controller, withouth having an auto rotation on the entire view? Thomas UPDATE: Thanks! I added this listener in the viewDidLoad: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didRotate:)name:UIDeviceOrientationDidChangeNotification object:nil]; the didRotate looks like this: (void) didRotate:(NSNotification *)notification { UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation]; if (orientation == UIDeviceOrientationLandscapeLeft) { //your code here } }

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  • What are the most interesting equivalences arising from the Curry-Howard Isomorphism?

    - by Tom
    I came upon the Curry-Howard Isomorphism relatively late in my programming life, and perhaps this contributes to my being utterly fascinated by it. It implies that for every programming concept there exists a precise analogue in formal logic, and vice versa. Here's an "obvious" list of such analogies, off the top of my head: program/definition | proof type/declaration | proposition inhabited type | theorem function | implication function argument | hypothesis/antecedent function result | conclusion/consequent function application | modus ponens recursion | induction identity function | tautology non-terminating function | absurdity tuple | conjunction (and) disjoint union | exclusive disjunction (xor) parametric polymorphism | universal quantification So, to my question: what are some of the more interesting/obscure implications of this isomorphism? I'm no logician so I'm sure I've only scratched the surface with this list. For example, here are some programming notions for which I'm unaware of pithy names in logic: currying | "((a & b) => c) iff (a => (b => c))" scope | "known theory + hypotheses" And here are some logical concepts which I haven't quite pinned down in programming terms: primitive type? | axiom set of valid programs? | theory ? | disjunction (or)

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  • Silverlight ControlTemplate and F#

    - by akaphenom
    Has anybody had any success incorporating a Silverlight ControlTemplate into an F# Silverlight application. I am trying to add transitions to the Navgiation.Frame element and following along on with a C# example: http://www.davidpoll.com/2009/07/19/silverlight-3-navigation-adding-transitions-to-the-frame-control The downloaded source uses the MSBUILD:Compile option on the template XAML and the file is included as a "Page"... ILDASM doesn't show any object created for the XAML; In my project I incldued it as a "Resource" (same as I have done for my pages) and referenced it in app.xaml: <Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="Module1.MyApp"> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/FSSilverlightApp;component/TransitioningFrame.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources> </Application> the TransitioningFrame.xaml is as follows: <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation" xmlns:toolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Layout.Toolkit"> <ControlTemplate x:Key="TransitioningFrame" TargetType="navigation:Frame"> <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"> <toolkit:TransitioningContentControl Content="{TemplateBinding Content}" Cursor="{TemplateBinding Cursor}" Margin="{TemplateBinding Padding}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" Transition="DefaultTransition" /> </Border> </ControlTemplate> </ResourceDictionary> My page objects all load their respective xaml with the follwoing code: type Page1() as this = inherit UriUserControl("/FSSilverlightApp;component/Page1.xaml") do Application.LoadComponent(this, base.uri) and somewhere in app startup: let p1 = new Page1() I donot have a comparable piece for the ControlTemplate - though I was hoping the application object and App.xaml would pull it in magically (as an aside, the reliance on this magic has made setting up a 100% f# silverlight application rather tricky - as nearly all the published articles I find are based around wizards and short cuts - very little on the acual plumbing - ugh). Any advice or thougts on the subject are appreciated.

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  • Application Context in Rails

    - by Sean McMains
    Rails comes with a handy session hash into which we can cram stuff to our heart's content. I would, however, like something like ASP's application context, which instead of sharing data only within a single session, will share it with all sessions in the same application. I'm writing a simple dashboard app, and would like to pull data every 5 minutes, rather than every 5 minutes for each session. I could, of course, store the cache update times in a database, but so far haven't needed to set up a database for this app, and would love to avoid that dependency if possible. So, is there any way to get (or simulate) this sort of thing? If there's no way to do it without a database, is there any kind of "fake" database engine that comes with Rails, runs in memory, but doesn't bother persisting data between restarts?

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  • Asp.net 4.0 site fails because no handler mapped with Classic appPool

    - by AndyV
    When I create a Asp.net app and flip the appPool to "ASP.NET v4.0 Classic" it fails with the following error: HTTP Error 404.17 - Not Found The requested content appears to be script and will not be served by the static file handler. After some searching it seems to be the handler not mapping correctly for the Classic mode but I can't find out where or how to fix that. I have the full .Net 4.0 install with VS2010 and the app works fine if I flip the appPool to Integrated. Also, it's a Windows 7 machine (I'm having the same problem on a Vista box). Thanks in advance. Andy

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  • Add new language to existing Xcode project localization

    - by leolobato
    Hey guys, I'm working on an existing Xcode 3.2.2 Universal iPhone OS project which is already localized for 4 languages (EN, IT, DE and FR). We are now adding a new language (JA) into this project. Each existing .lproj folder (en.lproj, it.lproj, de.lproj and fr.lproj) has almost 60 files - including PNGs, HTMLs and the Localizable.strings file. Each one of those files appear as localized groups inside Groups & Files in Xcode. They're spread all over the tree. If I right-click one of those groups (say, Localizable.strings) inside Xcode, Get Info, click on "Add Localization" and type "ja" - as the Xcode docs suggest, nothing happens. From what I read in this newgroup, it's possibly because of the way those folders are named. If they were named like English.lproj and Italian.lproj, this was supposed to work. So, for me to actually import a new language localized file into the existing group, I have to: Right-click the localized group file. Choose "Add Existing File". Select the corresponding file inside the ja.lproj folder. I'm about to get a new ja.lproj folder with those 60 localized files and would love to import them in the project in a way that doesn't involve searching for every single file in Groups & Trees and performing those steps... for every one of those 60 files. Is that possible? Is there a right (or better) way to import a new language into this Xcode project?

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  • How do I get toolbars on UISplitView detail & root views?

    - by Gerry
    I'm porting my iPhone app to iPad. I have a bunch of detail views that derive from UIViewController and implement UITableViewDelegate. (Basically TableViews but not derived as such). The old app used TabBar, but now I'd like to use SplitView with toolbars on the Detail and Master views. How do I enable a toolbar on my UIViewController inside a UISplitViewController? I'm not using Interface Builder here, just code. @interface HeadlineViewController : UIViewController { UITableView *tableView; NSMutableArray *bullIds; UIActivityIndicatorView *prog; } Thanks,

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  • Android Certificate Changed?

    - by rgrandy
    I recently formatted my computer and updated to Windows 7. I backed up my keystore and tried to sign my apk with it but it gave me an error that said my certificate expires in 22yrs. which is just shy of what the market requires to upload the apk. So now I am stuck not being able to update my app... How did this happen? Is there a way to extend the lifetime of certificates so that I can update my app? Is there a way to verify this certificate against an old apk that has been uploaded to the market so that I can be sure I am trying to sign with the same certificate and I didn't have a mix up? Error Pic

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  • Asp.Net 1 -> Asp.Net 2 upgrade - Machine.Config - unrecognized parameter

    - by Chris
    Hi All, I am working on upgrading a web app to asp.net 2 from 1. VS 2008 did its conversion things, and everything is building successfully and has been converted to a web application via the appropriate menu item in VS 2008. On launching the site using the Asp.net development server I am receiving a configuration error on the appsettings line in the machine config of Unrecognized attribute 'restartOnExternalChanges'. The app targets asp.net 2 in the projects properties in VS, and the error page indicates similar : Version Information: Microsoft .NET Framework Version:2.0.50727.3053; ASP.NET Version:2.0.50727.3053 The error message seems to indicate I am trying to run this in an asp.net 1 environment, but surely that isnt the case, and if so how do I rectify this. Any help would be appreciated Thanks,

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  • Screen overlay with Python, paint over an active window with background python script

    - by tvlife.admin
    Hi I'm writing a python script that runs in the background and takes screenshots of another application that is active. Then it analyses the screenshots and now it should overlay a certain image over the active app or the screen. I still need to be able to make mouse and keyboard inputs in the active app. So I need a way to overlay/paint on another window or on the screen, and still keep the other window the active window so that I can make inputs. I would prefer to do that with python in Mac OS, but if it isn't possible, other languages and even Windows (if really necessary) would also be ok. Can anybody help me? Thanks in advance!

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  • Seeking tuturial: introduction to ODBC with Delphi

    - by mawg
    I have a lot of embedded C/C++/Ada experience and an outdated smattering of Delphi plus some database stuff. Now I have to implement an app in Delphi which can manipulate MySql, Oracle, maybe MS Acess. In short, I need ODBC. I need to programatically created a database, define its structure and populate its contents, then later query its existence and programatically search. I would prefer not to use 3rd party components, unless there is a compelling reason to do so (performance ought not to be an issue for the app, it won't have much data or be run often, at least not in v1.0) . Can anyone point me at a tutorial which can get me up to speed? Thanks

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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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  • iPad SDK, how to handle orientation with an UIImageView

    - by Salah
    Hello I'm developing an app for iPad and I try to handle multiple orientation. My app contains a webview and a loading UIImageView that appears when my webview is loading content. This UIImageView has a background image that I set in InterfaceBuilder. When I change orientation to landscape, the image is cut. I'd like the UIImageView to set image-portrait.png when the ipad is in portrait mode and image-landscape.png when it's in landscape mode. Thank you for your help and advices! Screenshots :

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  • Establishing connection from java to access 2010 64bit

    - by user993250
    after going through several tutorials and blog posts, i have unsuccessfully tried to set up a connection from java to a microsoft access database. my system specifications are win 7 [64 bit] odbcad32.ese [64 bit] access 2010 [64 bit] jre6 [64 bit] the code that i wrote for establishing a connection public Connection makeConn() throws ClassNotFoundException, SQLException { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); conn = DriverManager.getConnection("jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=C:\\Users\\ARIFAH\\Desktop\\sampleDb.mdb"); return conn; } in the data source [odbc]---[located at path %windir%\system32\odbcad32.exe] i performed the following task USER DNS TAB ADD-Microsoft Access Driver (*.mdb, *.accdb ) [file ACEODBC.dll] -Finish Data Source Name: TestDriver ; Description: test driver for access 2010 64 bit ; DataBase-select -browse: C:\Users\ARIFAH\Desktop\sampleDb.mdb - ok apply ok now when i try to run my application, this is the error that i m getting, java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Could not find file '(unknown)'. at sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source) at sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source) at sun.jdbc.odbc.JdbcOdbc.SQLDriverConnect(Unknown Source) at sun.jdbc.odbc.JdbcOdbcConnection.initialize(Unknown Source) at sun.jdbc.odbc.JdbcOdbcDriver.connect(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at dataBase.connection.makeConn(connection.java:22) at newmodulewizrd.ui.App.<init>(App.java:32) at archetypedcomponent.commands.newModuleHandler.execute(newModuleHandler.java:39) at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:294) at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476) at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508) at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169) at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:241) at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:241) at org.eclipse.ui.menus.CommandContributionItem.handleWidgetSelection(CommandContributionItem.java:770) at org.eclipse.ui.menus.CommandContributionItem.access$10(CommandContributionItem.java:756) at org.eclipse.ui.menus.CommandContributionItem$5.handleEvent(CommandContributionItem.java:746) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3910) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3503) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514) at org.eclipse.equinox.launcher.Main.run(Main.java:1311) at org.eclipse.equinox.launcher.Main.main(Main.java:1287) *can somebody help with it??? *

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  • Flash video hiding the cursor on Mac OS X

    - by Tibor
    I found a Core Graphics function, CGCursorIsVisible, that one can use to determine whether the mouse cursor is shown on screen. I have a small app that uses a timer to call that function a few times a second to see if the cursor is shown or hidden (as I found no way to get my app notified when the mouse cursor shown/hidden status changes). The above works correctly except… when the Flash browser plugin plays a video: the mouse cursor gets hidden after a few seconds of mouse inactivity but CGCursorIsVisible() still keeps telling me that the cursor is indeed shown as if nothing happened. What I need is to be able to tell, at any given moment, whether the mouse cursor is shown to the end user on any screen. Is there any way to do that even in the case of playing a video using the Flash plugin?

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  • Pylons 1.0 AttributeError: 'module' object has no attribute 'metadata'

    - by shiki
    Python noob trying to learn Pylons. I'm using the QuickWiki tutorial (http://pylonshq.com/docs/en/1.0/tutorials/quickwiki_tutorial/) from the 1.0 documentation, but this alleged "1.0" doc seems to just be "0.9.7"; I suspect that this has something to do with the error I'm getting. When I execute "paster setup-app development.ini", I get this: (mydevenv)lucid@lucid-laptop:~/QuickWiki$ paster setup-app development.ini Traceback (most recent call last): ... edited for brevity... File "/home/lucid/mydevenv/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg/pkg_resources.py", line 1954, in load File "/home/lucid/QuickWiki/quickwiki/config/middleware.py", line 11, in <module> from quickwiki.config.environment import load_environment File "/home/lucid/QuickWiki/quickwiki/config/environment.py", line 12, in <module> from quickwiki.model import init_model File "/home/lucid/QuickWiki/quickwiki/model/__init__.py", line 27, in <module> pages_table = sa.Table('pages', meta.metadata, AttributeError: 'module' object has no attribute 'metadata' (mydevenv)lucid@lucid-laptop:~/QuickWiki$

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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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  • symfony: multiple apps, single login?

    - by gruner
    My symfony project is divided into several apps. Using the sfDoctrineGuard plugin I'd like to create another app just for login, and redirect to the appropriate app after login. My questions: • Is this advisable or does it go against how sfGuard is supposed to work? • Is there a way to redirect between applications without hardcoding the entire url? Is there a "symfony way" of doing it, or is this not how projects are supposed to function? (All I can find is this thread which is kind of vague on the specifics.)

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  • how to display a dialog if user can't download file

    - by tom smith
    hi. dealing with php/html/javascript. i'm trying to figure out a good/best approach to allowing a user to download a file. i can have the traditional href link, that interfaces with the back end php app to download the file. however, i want to have the app display some sort of dialog/alert if the user isn't able (basedon acl/permissions) to download the file... does this have to ba an ajax thing, as i don't want to do a page refresh... thoughts/comments/pointers to code samples are appreciated. thanks. -tom

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  • Calling activateWindow on QDialog sends window to background

    - by Stan
    I am debugging certain application written with C++/Qt4. On Linux it has problems that with certain window managers (gnome-wm/metacity), the main window (based on QDialog) is created in the background (it's not raised). I managed to re-create the scenario using PyQt4 and following code: from PyQt4.QtCore import * from PyQt4.QtGui import * import sys class PinDialog(QDialog): def showEvent(self, event): QDialog.showEvent(self, event) self.raise_() self.activateWindow() if __name__ == "__main__": app = QApplication(sys.argv) widget = PinDialog() app.setActiveWindow(widget) widget.exec_() sys.exit(0) If I remove self.activateWindow() the application works as expected. This seems wrong, since documentation for activateWindow does not specify any conditions under which something like this could happen. My question is: Is there any reason to have activateWindow in showEvent in the first place? If there is some reason, what would be good workaround for focusing issues?

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  • Opening popup links in UIWebView, possible?

    - by Jasarien
    Hey guys, I have a UIWebView which I'm using as an embedded browser within my app. I've noticed that links in webpages that open new windows are ignored without any call into my code. I've tried breakpointing on - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType and then selecting a link that would open a popup window, and the breakpoint is never hit. Is there anything I can do to intercept that selection of the popup link and get the URL and just load it normally? I'm not interested in displaying a popup window in the app itself, I just want the URL of whatever is going to be loaded in the popup window to load in the main webview itself. Is this possible? Thanks!

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  • Including libraries in project. Best practise.

    - by mridang
    Hi guys, I'm writing a Python open-source app. My app uses some open source Python libraries. These libraries in turn use other open-source libraries. I intend to release my code at Sourceforge or Google Code but do I need to include the sources of the other libraries? Is this a good practice? ...or should I simply write this information into a README file informing the use about the other required libraries. I've placed all these libraries into a libs sub folder in my source directory. When checking my code into SVN, should I use something called svn:externals to link to other sources? Is there a way to dynamically update my libraries to the latest version or is this something I have to do manually when I release a new version. My sincerest apologies if my question sounds vague but I'm pretty lost in this matter and I don't know what to Google for. Thanks all.

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  • Java ServerSocket Multiple Listen Instances

    - by ikurtz
    i have a java game app that uses sockets to communicate with each other. the issue is when i do a socket listen (server), i can run another instance of the game on the same machine using the same port as before to listen, and it results in listening again. now i have two instances of the application both listening on the same port. you can imagine only one connects when a connection comes through. the question is: how do i prevent the app from listening on the same port as another instance is already listening to? thanks in advance. EDIT: serverSocket = new ServerSocket(serverPort, backlog); im using this. should i try to use: ServerSocket(int port, int backlog, InetAddress bindAddr) instead? EDIT: SOLVED! i did not handle the exception only trapped it. now it is working well. thanks for your inputs.

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