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• Threading Issue with WCF Service

  - by helixed

  I'm new to both WCF and threading, so please bear with me. I have a WCF service set up. The service has multiple threads, all of which act upon a single array. This works without a problem so far. However, this service has a method, which, when called, will return the array. My questions: The array is serialized when it is transferred to the client by WCF. Is this a thread safe operation? In other words, can I count on WCF to block all threads from accessing this array while it's being serialized? If I can't count on WCF to do this, then how can I implement it manually? I don't really understand how WCF would facilitate this since the serialization happens after I return from my method call. How can I guarantee a thread will not modify the array after it's been returned by my method but before WCF serializes it?

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• What is all this stuff in the CKEditor folder?

  - by Ashley Ward

  A while ago I downloaded the latest version (3.1) of the CKEditor text editor. The directory name was ckeditor and I deleted the ckeditor/_source and ckeditor/_samples sub-directories, then I referenced the ckeditor.js file in my html pages, like so : <script type="text/javascript" src="ckeditor/ckeditor.js"></script> this works well. To make config changes, I have been modifying the ckeditor/config.js file. However, as of late, I have been reading various web resources that say 'do not delete the _source' folder and other such ominous messages. What is this _source folder? What is all the stuff at the root of the ckeditor folder? and, What is safe to remove from the folder?

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• How can I listen to multiple Serial Ports asynchronously in C#

  - by Kamiel Wanrooij

  I have an application that listens to a piece of hardware on a USB to Serial converter. My application should monitor more than one serial port at the same time. I loop the serial ports I need to listen to, and create a thread for each port. In the thread I have my data handing routine. When I assign one port, it runs flawlessly. When I listen to the other one, it also works. When I open both ports however, the second port always throws an UnauthorizedAccessException when calling serialPort.Open(). It does not matter in what order I open the ports, the second one always fails. I listen to the ports using serialPort.ReadLine() in a while loop. Can .NET open more than one port at the same time? Can I listen to both? Or should I use another (thread safe?) way to access my serial port events?

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• Can the same CriteriaBuilder (JPA 2) instance be used to create multiple queries?

  - by pkainulainen

  This seems like a pretty simple question, but I have not managed to find a definitive answer yet. I have a DAO class, which is naturally querying the database by using criteria queries. So I would like to know if it is safe to use the same CriteriaBuilder implementation for the creation of different queries or do I have to create new CriteriaBuilder instance for each query. Following code example should illustrate what I would like to do: public class DAO() { CriteriaBuilder cb = null; public DAO() { cb = getEntityManager().getCriteriaBuilder(); } public List<String> getNames() { CriteriaQuery<String> nameSearch = cb.createQuery(String.class); ... } public List<Address> getAddresses(String name) { CriteriaQuery<Address> nameSearch = cb.createQuery(Address.class); ... } } Is it ok to do this?

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• Basic HTTP Authentication using Obj C and Xcode.

  - by Kristiaan

  Hi Everyone, I am hoping someone can help me with a question i have relating to Basic HTTP Authentication in an Xcode 2.3 application. Basically i have a PHP page that is on our server and when called with certain parameters returns data relating to the servers condition etc. i have managed to get a small Xcode application working where by it reads the data from the page and populates an NSTextView with the data. however to make sure this information stays safe i have setup basic HTTP Authentication on the page, but i cannot work out how to provide the username and password in XCode. here is my code to retrieve the page. NSURL *url = [NSURL URLWithString:@"http://www.google.com"]; NSString *content = [NSString stringWIthContentsOfUrl:url]; [myTextView setString:content]; i am still at a very basic beginner level regarding xcode and obj c, so nice simple examples of how i go about this would really be appreciated. Thanks Kris

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• Ant trouble with environment variables on Ubuntu

  - by Inaimathi

  Having some trouble with with ant reading environment variables in Ubuntu 9.10. Specifically, the build tasks my company uses has a token like ${env.CATALINA_HOME] in the main build.xml. I set CATALINA_HOME to the correct value in /etc/environment, ~/.pam_environment and (just to be safe) my .bashrc. I can see the correct value when I run printenv from bash, or when I eval (getenv "CATALINA_HOME") in emacs. Ant refuses to build to the correct directory though; instead I get a folder named ${env.CATALINA_HOME} in the same directory as my build.xml. Any idea what's happening there, and/or how to fix it?

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• WebDAV auto-versioning in Git or Hg or any modern VCS

  - by Marcus P S

  I just recently learned of SVN's auto-versioning feature for WebDAV. Although I understand this is not replacement for proper versioning, with messages documenting change sets, it strikes me as a solid and safe replacement to Dropbox (minus nice GUIs and web pages). However, since commits in auto-versioning are frequent, I'd imagine that Git or Hg would be better suited for this, just because of their more compact databases (although I wonder if the distributed nature of things could make the automation ugly for resolving conflicts). Is this a feature that has been implemented using Git or Hg, as far as anyone knows?

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• PHP: testing for existence of a cell in a multidimensional array

  - by gidireich

  Hi, I have an array with numerous dimensions. Want to test for existence of a cell. The below cascaded approach, will be for sure a safe way to do it: if (array_key_exists($arr, 'dim1Key')) if (array_key_exists($arr['dim1Key'], 'dim2Key')) if (array_key_exists($arr['dim1Key']['dim2Key'], 'dim3Key')) echo "cell exists"; But it there a simpler way? I'll go into more details about this: 1. Can I perform this check in one single statement? 2. Do I have to use array_key_exist or can I use something like isset? Will appreciate if someone explains when to use each and why Thanks Gidi

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• Html index page and files in that directory

  - by Frank

  On my web site, there is an index page, but if I take out that index page, users will see the files in that directory, for instance my site is : XYZ.com and I have a directory called "My_Dir", so when a user typed in "XYZ.com/My_Dir" he will see the index.html if there is one, but if it's not there, he will see a list of all my files inside "My_Dir", so is it safe to assume that with an index page in any of my sub directories, I can hide all the files in those directories from users, in other words if I have "123.txt, abc.html and index.html" in "My_Dir", users won't be able to see "123.txt, abc.html" because of the existence of "index.html" [ unless of course I mention those two files inside index.html ] ? Frank

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• How to access MyProject.MySettings.Default.SomeSetting from xaml?

  - by Shimmy

  I have defined a StringCollection in the Project Settings. I want to use the values in a ComboBox. Is there a way to access it xamly? I tried: <CollectionViewSource Source="{x:Static src:MySettings.Default.MyCollection}" /> <CollectionViewSource x:Key="RoomSections" Source="{x:Static src:MySettings.Default.RoomSections}" /> *src is the xmlns of the project It says: "Type src:MySettings.Default was not found". The thing is that MySettings is a class that offers a Default property which is a thread-safe instance of MySettings, I really want to get the collection from the Default property and not by instantiating a new on. Is there other ways I am not aware of, maybe ObjectDataProvider can access static objects? I thought, maybe I can make in the App.xaml a global resource that return MySettings.Default which is an instance of the MySettings class, and then access all its properties, I will try that out, but I prefer the easy way.

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• Logging strategy vs. performance

  - by vtortola

  Hi, I'm developing a web application that has to support lots of simultaneous requests, and I'd like to keep it fast enough. I have now to implement a logging strategy, I'm gonna use log4net, but ... what and how should I log? I mean: How logging impacts in performance? is it possible/recomendable logging using async calls? Is better use a text file or a database? Is it possible to do it conditional? for example, default log to the database, and if it fails, the switch to a text file. What about multithreading? should I care about synchronization when I use log4net? or it's thread safe out of the box? In the requirements appear that the application should cache a couple of things per request, and I'm afraid of the performance impact of that. Cheers.

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• replace file with hardlink to another file atomically

  - by Ben Clifford

  I have two directory entries, a and b. Before, a and b point to different inodes. Afterwards, I want b to point to the same inode as a does. I want this to be safe - by which I mean if I fail somewhere, b either points to its original inode or the a inode. most especially I don't want to end up with b disappearing. mv is atomic when overwriting. ln appears to not work when the destination already exists. so it looks like i can say: ln a tmp mv tmp b which in case of failure will leave a 'tmp' file around, which is undesirable but not a disaster. Is there a better way to do this? (what I'm actually trying to do is replace files that have identical content with a single inode containing that content, shared between all directory entries)

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• Django - How to do CSFR on public pages? Or, better yet, how should it be used period?

  - by orokusaki

  After reading this: http://docs.djangoproject.com/en/dev/ref/contrib/csrf/#how-to-use-it I came to the conclusion that it is not valid to use this except for when you trust the person who is using the page which enlists it. Is this correct? I guess I don't really understand when it's safe to use this because of this statement: This should not be done for POST forms that target external URLs, since that would cause the CSRF token to be leaked, leading to a vulnerability. The reason it's confusing is that to me an "external URL" would be on that isn't part of my domain (ie, I own www.example.com and put a form that posts to www.spamfoo.com. This obviously can't be the case since people wouldn't use Django for generating forms that post to other people's websites, but how could it be true that you can't use CSRF protection on public forms (like a login form)?

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• MySQL performance

  - by kapil.israni

  Hi, I have this LAMP application with about 900k rows in MySQL and I am having some performance issues. Background - Apart from the LAMP stack , there's also a Java process (multi-threaded) that runs in its own JVM. So together with LAMP & java, they form the complete solution. The java process is responsible for inserts/updates and few selects as well. These inserts/updates are usually in bulk/batch, anywhere between 5-150 rows. The PHP front-end code only does SELECT's. Issue - the PHP/SELECT queries become very slow when the java process is running. When the java process is stopped, SELECT's perform alright. I mean the performance difference is huge. When the java process is running, any action performed on the php front-end results in 80% and more CPU usage for mysqld process. Any help would be appreciated. MySQL is running with default parameters & settings. Software stack - Apache - 2.2.x MySQL -5.1.37-1ubuntu5 PHP - 5.2.10 Java - 1.6.0_15 OS - Ubuntu 9.10 (karmic)

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• How do you exclude folders on get operation for sourcecontrol in CruiseControl.NET

  - by Jon

  I have a cruisecontrol.net project which currently doesn't monitor a source safe project. It is forced manually. Within the source control block however I want to be able to exclude the 'get' operation of a certain folder. I know there is a ExclusionFilter feature on a source control block in the config file, but I think that this excludes the sub folder from being monitored not from being retrieved from the repository. Can anyone confirm this is the case, or help me find out how I can achieve this? I'm using CCNet 1.4 and SourceSafe

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• Lucene's nested query evaluation regarding negation

  - by ponzao

  Hi, I am adding Apache Lucene support to Querydsl (which offers type-safe queries for Java) and I am having problems understanding how Lucene evaluates queries especially regarding negation in nested queries. For instance the following two queries in my opinion are semantically the same, but only the first one returns results. +year:1990 -title:"Jurassic Park" +year:1990 +(-title:"Jurassic Park") The simplified object tree in the second example is shown below. query : Query clauses : ArrayList [0] : BooleanClause "MUST" occur : BooleanClause.Occur "year:1990" query : TermQuery [1] : BooleanClause "MUST" occur : BooleanClause.Occur query : BooleanQuery clauses : ArrayList [0] : BooleanClause "MUST_NOT" occur : BooleanClause.Occur "title:"Jurassic Park"" query : TermQuery Lucene's own QueryParser seems to evaluate "AND (NOT" into the same kind of object trees. Is this a bug in Lucene or have I misunderstood Lucene's query evaluation? I am happy to give more information if necessary.

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• How to store the path of a game pawn in a turn based game ?

  - by panzerschreck

  Hello, I have a square grid, for a turn based game ( grid is similar to the chess board ), but the moves in the games are different based on whether you have lapped your opponent pawn at least once or not. i.e if you have not lapped (beaten any of the opponents pawns) in the outer most grid as below if you have lapped your opponent pawn once at least, then you get to reach home,this way.Any player having all his pawns reaching "home" first wins. The ones in yellow are safe-houses, i.e both the opponent pawn and the player's pawn get to stay in the same grid, this is not considered to be lapping ( the opponent ).The lapped pawn will return to its start point. Now the question is, what is the effective way to store the paths for the all the pawns.we will have 4 pawns for the player and 4 opponent pawns. Is there any pattern to store such static information, in a elegant way ? Thanks for your time

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• Passing a SAFEARRAY from C# to COM

  - by SlavaGu

  I use 3rd party COM to find faces in a picture. One of the methods has the following signature, from SDK: long FindMultipleFaces( IUnknown* pIDibImage, VARIANTARG* FacePositionArray ); Parameters: pIDibImage[in] - The image to search. FacePositionArray[out]- The array of FacePosition2 objects into which face information is placed. This array is in a safe array (VARIANT) of type VT_UNKNOWN. The size of the array dictates the maximum number of faces for which to search. which translates into the following C# method signature (from metadata): int FindMultipleFaces(object pIDibImage, ref object pIFacePositions); Being optimistic I call it the following way but get an exception that the memory is corrupt. The exception is thrown only when a face is present in the image. FacePosition2[] facePositions = new FacePosition2[10]; object positions = facePositions; int faceCount = FaceLocator.FindMultipleFaces(dibImage, ref positions); What's the right way to pass SAFEARRAY to unmanaged code?

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• Localize Currency for iPhone

  - by Meltemi

  I would like my iPhone app to allow the input, display and storage of currency amounts using the appropriate symbol ($, €, £, ¥, etc) for the user. Would NSNumberFormatter do everything I need? What happens when a user switches their locale and these amounts (dollars, yen, etc.) are stored as NSDecimalNumbers. I assume, to be safe, it's necessary to somehow capture the locale at the time of entry and then the currency symbol and store them in my instance along with the NSDecimalNumber ivar so they can be unwrapped and displayed appropriately down the road should the user changed their locale since the time when the item was created? Sorry, I have little localization experience so hoping for a couple quick pointers before diving in. Lastly, any insight on how to you handle this kind of input given the limitations of the iPhone's keyboards?

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• AsyncTask, RejectedExecutionException and Task Limit

  - by Samuh

  I am fetching lots of thumbnails from a remote server and displaying them in a grid view, using AsyncTask. The problem is, my grid view displays 20 thumbnails at a time, so that creates 20 AsyncTasks and starts 20 executes, one per thumbnail. I get RejectedExecution exception in my code. I recall reading somewhere that there is a limit to number of tasks that AsyncTask can have in its queue at a time, i might be hitting that. Was this bar lifted? Is there a way to increase this limit? Is it safe to just ignore this exception?(by having an empty catch(RejectedException e){} block?) I am running this code on Android 1.6 emulator and the API level in my code(minSDKVersion is 3). [EDIT: Added SDK and API level info]

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• How to link paid app user account to the system ?

  - by user164589

  Hi guys, I have an issue related publishing the paid app to android market. (My application is internet connection based app.) If I've put the app to the android market, can user who bought the app pass to anyone ? How is its security (I mean safe of .apk file) ? Also, what is payment tool of android market ? My main point is choosing the best way to link paid user to our system. Actually I don't know how to link paid user account to my system(by email address or device unique id ?... what is better way ?). Can you suggest me on this part ? I really appreciate for help. Thanks in advance.

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• Understanding NSHTTPCookieStorage for the iPhone

  - by psychotik

  Maybe I'm missing something, but from Apple's documentation for NSHTTPCookieStorage, I can't help but wonder how this is safe to use. Does this mean that cookie storage is shared across all apps on the iPhone? If my app makes an Http call that results in some cookies being saved, do all apps now have access to these cookies? Methods like: cookiesForURL: Returns all the receiver's cookies that will be sent to a specified URL. make it look even more suspicious. Can someone explain how this is OK, and what the class does? Also, assuming my understanding is flawed and this is indeed sandboxed per-app, do calls made using NSURLRequest automatically save/retrieve cookies from this store or is it the developers responsibility to set request headers before dispatching the request?

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• Visual Studio 2008 Unexpected Error on Project Checkout with VSS 2005

  - by Cyberherbalist

  I've encountered an odd misbehavior of VS 2008's integration with Visual Source Safe 2005. Situation occurs when I fire up VS2008 when a project is checked out to someone else, and later they check the project back in, while I still hold the VS2008 open. If I at that time add a new item, VS2008 tells me that my action has caused a check out of the project and a new version has been loaded from source control. Fair enough, but thereafter I get an error dialog stating "Visual Studio has encountered an unexpected error" with OK at every subsequent action, such as save file and search text, making it almost unusable. This is overcome by closing VS (which pops the error dialog once more) and restarting. Is there some kind of fix or workaround to this (besides the obvious ones: "don't try to check out the project when it's checked out to someone else", or "get latest version if you think the other person may have checked the project back in")?

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• Using memcpy to copy managed structures

  - by Haris Hasan

  Hi, I am working in mixed mode (managed C++ and C++ in one assembly). I am in a situation something like this. ManagedStructure ^ managedStructure = gcnew ManagedStructure(); //here i set different properties of managedStructure then I call "Method" given below and pass it "& managedStructure" Method(void *ptrToStruct) { ManagedStructure ^ managedStructure2 = gcnew ManagedStructure(); memcpy(&managedStructure2 , ptrToStruct, sizeof(managedStructure2 )); } I have following question about this scenario. 1) Is it safe to use memcpy like this? and if not what is its alternate to achieve same functionality? ( I can't change "Method" definition) 2) I am not freeing any memory as both the structures are managed. Is it fine?

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• How does COM registration work in Windows

  - by Air Benji

  I'm an application packager trying to make sense of how the COM registry keys (SelfReg) interrelate to the given .dll in Windows. ProgID's, AppID's, TypeLibs, Extensions & Verbs are all tied around the CLSID right? Do CLSID's always use Prog/App IDs or could you just have a file extension class? Which bits are optional? Some of it seems to be 'like a router' where there's the two interfaces (internal - .dll) and external (the extension etc). How does this all fit? (The SDK documentation doesn't make sense to me) I ask as this is all pivotal to application 'healing' with Windows Installer (which packagers are all 'big' on, but there's no nitty-gritty breakdowns since its a coder-thing really) ---Edit: Am I safe in assuming that for what COM is registered, it must all link back to the CLSID and cannot be a 'dead-end'? Verbs need extensions which need progid's... What about the AppId's, TypeLibs and Interfaces? How do they interrelate?

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