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• How does the Garbage Collector decide when to kill objects held by WeakReferences?

  - by Kennet Belenky

  I have an object, which I believe is held only by a WeakReference. I've traced its reference holders using SOS and SOSEX, and both confirm that this is the case (I'm not an SOS expert, so I could be wrong on this point). The standard explanation of WeakReferences is that the GC ignores them when doing its sweeps. Nonetheless, my object survives an invocation to GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced). Is it possible for an object that is only referenced with a WeakReference to survive that collection? Is there an even more thorough collection that I can force? Or, should I re-visit my belief that the only references to the object are weak?

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• Naming convention for utility classes in Java

  - by Zarjay

  When writing utility classes in Java, what are some good guidelines to follow? Should packges be "util" or "utils"? Is it ClassUtil or ClassUtils? When is a class a "Helper" or a "Utility"? Utility or Utilities? Or do you use a mixture of them? The standard Java library uses both Utils and Utilities: javax.swing.Utilities javax.print.attribute.AttributeSetUtilities javax.swing.plaf.basic.BasicGraphicsUtils Apache uses a variety of Util and Utils, although mostly Utils: org.apache.commons.modeler.util.DomUtil org.apache.commons.modeler.util.IntrospectionUtils org.apache.commons.io.FileSystemUtils org.apache.lucene.wordnet.AnalyzerUtil org.apache.lucene.util.ArrayUtil org.apache.lucene.xmlparser.DOMUtils Spring uses a lot of Helper and Utils classes: org.springframework.web.util.UrlPathHelper org.springframework.core.ReflectiveVisitorHelper org.springframework.core.NestedExceptionUtils org.springframework.util.NumberUtils So, how do you name your utility classes?

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• Getting websites to detect our mobile browser

  - by Chromatix

  I've been asked to find out a sensible way to make the majority of popular websites detect our browser - which is functionally complete, but is running on rather constrained hardware - as a "mobile" browser. The idea is that the heaviest popular websites seem to have mobile versions, which render much faster and fit better on the screen. I've looked at the inverse question, which tells me that there isn't an obvious standard way of doing it - http://www.brainhandles.com/techno-thoughts/detecting-mobile-browsers is a case in point. This is borne out by looking at a variety of User-Agent strings from popular mobile and desktop browsers. So far the best idea we can come up with is to add "Mobile" to the string somewhere, since this is the main visible difference between Safari for iPad/iPhone and for Windows/Mac. Does anyone have a better idea?

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• WriteableBitmap in .NET 4

  - by Jamie

  Hi there, I have got a problem: I would like to use a method Render() for WriteableBitmap object. However, as I noticed, the method is not available without using a Silverlight assembly System.Windows.dll. I need to use RenderTargetBitmap in my project (PresentationCore assembly for standard .net). Here is the problem - there are definitions of some classes in both assemblies, thus they are in conflict. Basically, I need to add some stuff to Bgra32 bitmap. However, RenderTargetBitmap works only with Pbgra32 ones. I found that using WriteableBitmap to render would be nice. Maybe I am wrong? Do you have any ideas? Thank you in advance for the reply! Cheers

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• What is your longest-held programming assumption that turned out to be incorrect?

  - by Demi

  I am doing some research into common errors and poor assumptions made by junior (and perhaps senior) software engineers. What was your longest-held poor assumption that was eventually corrected? For example: I at one point failed to understand that the size of an integer was not a standard (depends on the language and target). A bit embarrassing to state, but there it is. Be frank: what hard-held belief did you have, and roughly how long did you maintain the assumption? It can be about an algorithm, a language, a programming concept, testing, anything under the computer science domain.

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• MySQL, C++: Retrieving auto-increment ID

  - by Thomas Matthews

  I have a table with an auto-incrementing ID. After inserting a new row, I would like to retrieve the new ID. I found an article that used the MySQL function LAST_INSERT_ID(). The article says to create a new query and submit it. I'm using MySQL Connector C++, Windows XP and Vista, and Visual Studio 9. Here are my questions: Is there an API, for the connector, that will fetch the ID out of the record? Does the result set, after an insert/append, contain the new ID? The LAST_INSERT_ID is MySQL specific. Is there an SQL standard method for obtaining the new ID?

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• Custom Scrollbar for UITableView

  - by iFloh

  the iTunes song list display is a TableView that has a dotted scrollbar on the right which allows me to jump to a relative position of the list (i.e. if I click the bar at 2/3 down I am scrolled to the 66% position of the list. I want to do the same in my UITableView, but am not sure whether this is standard functionality that I can use (which class?) or whether this is a custom build ... If the latter, has someone got some samplecode that I could use as a template?

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• Best tool to check and ensure PDF/A compatibility under Linux

  - by Sven Lilienthal

  I am working on an online portal, where researchers can upload their research papers. One requirement is, that all PDFs are stored in PDF/A-format. As I can't rely on the users to generate PDF/A conforming documents, I need a tool to check and convert standard PDFs into PDF/A format. What is the best tool you know of? Price Quality Speed Available APIs Open-source tools would be prefered, but a search revealed none. iText can create PDF/a, but converting isn't easy to do, as you have to read every page and copy it to a new document, losing all bookmarks and annotations in this process. (At least as far as I know, if you know of an easy solution, let me know). APIs should be available for either PHP, Java or a command-line-tool should be provided. Please do not list either GUI-only or Online-only solutions.

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• CSS border and the :hover dynamic pseudo-class

  - by dbasch

  Hi All, I have built a persistent dropline menu with two levels using only CSS. It is pretty standard. It is a nested set of UL's and the UL's :hover state is what shows and hides the sub menu levels. Something like this: | *Pets* | Colors | Cars | | Cats | Dogs | Birds| Goats | Sheep | | Pets | *Colors* | Cars | | Red | Orange | Green | Blue| Yellow | I then added a 1px border at the bottom of the first level UL element. Like this: | *Pets* | Colors | Cars | -------------------------------------- | Cats | Dogs | Birds| Goats | Sheep | When I hover over a first level item (Pets), and then move the mouse down to the second level (Cats), the entire second level disappears. I finally figured out that the UL's 1px border is not included in the hover area for the UL. Can I add a border to the bottom of a dropline menu level without messing up the menu hovering? Thanks!

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• Sharepoint checkin/checkout

  - by Prashanth

  We have a sharepoint based application that uses a custom database for storing metadata/files (which could also be on a file share) My question is how can the standard file checkin/check out option in document library be customized? The javascript file ows.js in the layouts folder contains the functions that provide checkin/check out/ open file functionality. Behind the scenes it relies on a combination of HTTP Post/GET methods + SOAP + an activeX control to achieve the desired functionality. Customizing these javascript function seems tedious/error prone. Note that we have a web service that exposes endpoints, for retrieving necessary file information/data from the backend. The difficulty is in integrating it with the sharepoint js functions, due to lack of proper documentation. (Also the js functions might change over different versions of sharepoint) Also is it possible to create files/open files etc from the cache area on the client machine from server side code?

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• How to protect web site against hackers?

  - by Adi barda

  Hi Guys, Like everyone of us, I have my own dreams about developing the next cool product that will be adopted by many users and become industry standard. Surprisingly, I find that the most challenging task is to keep my website up & running. My site is being hacked again and again no matter what I do - I blocked the FTP connections, changed the Joomla (CMS) database table names, installed all latest patches and what not. The web site supports the product (over 1800 users now...) by generating licenses, support forums, documentation, galleries etc. The product which is a winforms application cannot be marketed without this web site. My question: Do you have any innovative idea about securing joomla based web sites or what is the best secured web hosting you know. currently i'm hosting my site at ixwebhosting and i like them very much but obviously i can't do any serious marketing being hacked over and over again Thank you very much, Adi Barda

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• Allow native DLL to output stdout / stderr in c# console application

  - by xaw

  I have a native DLL which outputs via stdout / stderr. I have a C# console application which calls this DLL and outputs binary data to a parent C# application which started the C# console exe, processing stdout / stderr. Currently when I call the C# exe it works just fine (the DLL hooks up to the stdout of my console application and puts its data in just fine). Is this by design (and shouldn't be broken in future .NET framework versions)? Are there limitations on my managed code's deployment with this strategy (full-trust, permission requirements, GAC issues, etc)? I can't seem to find any documentation about stdout with a managed exe and an unmanaged dll both putting data in that standard output on MSDN. Thanks,

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• Eclipse Javascript code assist problem in using WTP

  - by pinkynobrain

  Hi, I'm new to WTP so excuse me if the solution to this is obvious. When i define and use a class from within the same file i get nice code assist help, i also get code assist for classes from the standard libraries. Unortunatly, when i try to use code and declarations from one file in another file i no longer get t he nice code assist features. I have searched the web and tried a couple of things, making shoure JS is enabled for the project, making sure the folder the scripts are in is added to the JS source folder list and even trying making a new folder with the decleration files in and adding it as a library. I would really like ot get this feature working so any help would be appreciated.

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• MS-Access VBA: form_error vs on error

  - by dmr

  I am trying to set up error handling for a MS-Access application. The standard method to do this seems to be with an On Error statement in each subroutine/function. It seems simpler to me to use the Form_Error function to catch all the runtime errors in that form as opposed to an On Error statement for each sub/function called by an event on that form. (Obviously, for code in modules, there is no Form_Error function and therefore the only method is the On Error statement) What are the pros and cons of using On Error vs Form_Error?

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• Javascript performance issue

  - by Daniel

  Hello, I've built a top menu based on superfish, but the amount of displayed items in the menu is huge. And there is also alot of jquery on the top menu. Now to the problem, everytime I load any page that has the menu, the browser(ie7) feels like it looks it locks it self for about 1-2 seconds while the page is being loaded. I'm sure that the top menu is the issue, and I would like to improve the performance of the page.(besides removing the menu and removing the menu items) I've used firebug to see which calls take most of the times, and I the calls are standard jquery or superfish. The top menu is a ascx control. Are they any good ways to let the page load first and the menu later or any other goods ideas to improve the performance?

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• RTSP streaming and save into mp4 file using VLC

  - by Vivek Navadia

  Hello All let say i am having one RTSP url (rtsp://192.168.0.17/mpeg4). the live camera is setup on the machine which relay live video. i am streaming it using vlc player and i am saving it in mp4 file on some location (i.e. c:\temp.mp4). Now i am opening another vlc player instance and open this file (c:\temp.mp4). but as it is in use and saving live streaming to that file. that will not be played. if if stop the streaming and then played temp.mp4 file then it will play the streamed (saved) video. Now my requirement is VLC player should also stream and save into temp.mp4 file continuously and at the same time that file should be played in any standard player. is it possible to do with any option using VLC player that we can do both this things simultaneously. Thanks Vivek

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• Injecting logger, weld

  - by kislo_metal

  Hi. I am trying to replace standard logger initialization by some injection 1-st. I was trying to use weld weld logging in stateless bean/webservices @Stateless @WebService public class EchoSSL { @Inject private Logger log; public EchoSSL() { } public String echo(String msg) { log.debug("Log test"); return "Echoing: " + msg; } } But it not working for me.. i get java.lang.reflect.InvocationTargetException What is missed ? 2-nd than I try this tutorial that is referenced to this - Custom Injections But it also dosen`t help. Q: What is the rule of weld Logger injection in ejb / web services ?

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• Reducing the pain writing integration and system tests

  - by mdma

  I would like to make integration tests and system tests for my applications but producing good integration and system tests have often needed so much effort that I have not bothered. The few times I tried, I wrote custom, application-specific test harnesses, which felt like re-inventing the wheel each time. I wonder if this is the wrong approach. Is there a "standard" approach to integration and full system testing? EDIT: To clarify, it's automated tests, for desktop and web applications. Ideally a complete test suite that exercises the full functionality of the application.

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• How to trace a raw (character) device stream on Unix ?

  - by Fabien

  I'm trying to trace what is transiting in a raw (character) device on an Unix system (ex: /dev/tty.baseband) for DEBUG purpose. I am thinking of creating a deamon that would: upon start rename /dev/tty.baseband to /dev/tty.baseband.old. create a raw node /dev/tty.baseband spawn two threads: Thread 1: reading /dev/tty.baseband.old writing into /dev/tty.baseband Thread 2: reading /dev/tty.baseband writing into /dev/tty.baseband.old This would work a little bit like a MITM process. I wonder if there is not a 'standard' way to do this.

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• Wrapping with Dependency Properties

  - by Chris

  I've got a Windows Forms control that I'm wrapping with a WindowsFormsHost-derived class to access WPF's data binding functionality. The Forms control exposes properties that indicate its state, along with the standard property-changed event notifier. For example, a Zoom property on the Forms control is accompanied with a ZoomChanged event. In the WindowsFormsHost wrapper, I'm using a DependencyProperty to represent the underlying Windows Forms control property. Binding works as expected going to the control; however, I'm not sure how to correctly propogate property changes from the wrapped control back out to binding subscribers (i.e., the Windows Form control changes its Zoom property and raises the ZoomChanged event). Any ideas on how to accomplish this? Should I be using a different approach?

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• Seeking References To MSVC 9.0's C++ Standards Compliance

  - by John Dibling

  I "know" (hopefully) that MSVC 9.0 Implements C++ 2003 (ISO/IEC 14882:2003). I am looking for a reference to this fact, and I am also looking for any research that has been done in to how compliant MSVC 9.0 is with that version of the Standard. I have searched for and not been able to find a specific reference from MicroSoft that actually says something to the effect that MSVC implements C++ 2003. Some of the out-of-date documentation says things like "this release achieves roughly 98% compliance" (when referring to MSVC .NET 2003's conformance to C++ 1997). But I want a link to a document from MS that says "MSVC 9.0 implements blah," and another link to an independent group that has tested the conformance of MSVC 9.0. Do you know of any such links?

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• taskbar-free window manager

  - by 7vies

  I'm looking for a window manager that is not based on the "standard" taskbar (which I find a poor idea and I'm completely tired of). I'm aware of tiling window managers and improvements in last versions of operating systems, but I can't find what I need. I suppose that any window takes the whole screen (or can be tiled), and I imagine switching between windows like that: on a hotkey or mouse hot zone the screen becomes a task switcher where tasks are organized in a somewhat convenient manner. Well, it's a bit like a taskbar with autohide, but I think there could be some more convenient ideas than simply stacking icons and descriptions... It is also supposed to be lightweight enough, for example to run on a netbook. Any suggestions?

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• Access event.target in IE8 unobstrusive Javascript

  - by Mirko

  The following function gets the target element in a dropdown menu: function getTarget(evt){ var targetElement = null; //if it is a standard browser if (typeof evt.target != 'undefined'){ targetElement = evt.target; } //otherwise it is IE then adapt syntax else{ targetElement = evt.srcElement; } //return id of element when hovering over or if (targetElement.nodeName.toLowerCase() == 'li'){ return targetElement; } else if (targetElement.parentNode.nodeName.toLowerCase() == 'li'){ return targetElement.parentNode; } else{ return targetElement; } Needless to say, it works in Firefox, Chrome, Safari and Opera but it does not in IE8 (and I guess in previous versions as well). When I try to debug it with IE8 I get the error "Member not Found" on the line: targetElement = evt.srcElement; along with other subsequent errors, but I think this is the key line. Any help will be appreciated.

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• Packaging one or two plugins as a standalone RCP application?

  - by Martin Cowie

  I have a handful of Eclipse plugins that I maintain. They are proving useful enough that non Eclipse users have asked for them without the overhead of a full eclipse install. I am certain this is possible, but uncertain how to make this possible. My attempts at creating a standalone RCP app and then including my plugins as dependencies have given me mixed results. More specifically, my perspective tries to instantiate a view from a plugin and fails (silently)... public void createInitialLayout(IPageLayout layout) { layout.addStandaloneView( "myPlugin.ID", false, IPageLayout.LEFT, 0.25f, editorArea); } ... but as the same plugin implements a search extension, it does show up in the standard Eclipse search dialog. Are there any resources that hardened Eclipse tars can point me to, that will help overcome this hurdle? M.

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• How to compile a program which needs a newer version of glib

  - by michael

  Hi, I am trying to compile Webkit on Ubuntu 8.04. But when i run autogen.sh, I get the following error saying it needs a newer version of glib. So what is the safest way to install glib without screwing up the rest of my OS (since the rest needs 2.16 while webkit compile needs 2.21)? checking for GLIB... configure: error: Package requirements (glib-2.0 >= 2.21.3 gobject-2.0 >= 2.0 gthread-2.0 >= 2.0) were not met: Requested 'glib-2.0 >= 2.21.3' but version of GLib is 2.16.6 Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables GLIB_CFLAGS and GLIB_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details.

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