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• SoundPlayer causing Memory Leaks?

  - by Nick Udell

  I'm writing a basic writing app in C# and I wanted to have the program make typewriter sounds as you typed. I've hooked the KeyPress event on my RichTextBox to a function that uses a SoundPlayer to play a short wav file every time a key is pressed, however I've noticed after a while my computer slows to a crawl and checking my processes, audiodlg.exe was using 5 GIGABYTES of RAM. The code I'm using is as follows: I initialise the SoundPlayer as a global variable on program start with SoundPlayer sp = new SoundPlayer("typewriter.wav") Then on the KeyPress event I simply call sp.Play(); Does anybody know what's causing the heavy memory usage? The file is less than a second long, so it shouldn't be clogging the thing up too much.

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• Can I partition the C# System.Threading.ThreadPool?

  - by Drew Shafer

  I love ThreadPool. It makes my life better. However, my love may have quietly turned into an abusive relationship that I need to escape from, so I need some advice from my SO brothers (and presumably sisters, although I haven't seen any actual evidence of that yet). My basic problem is that I have several different libraries that are all using the threadpool in an uncoordinated way, and running out of threads is a possibility. I was hoping there was some way I could partition the ThreadPool up so I could give a certain class 1 thread, another 20 threads, another 5 threads, and so on. I know I could write my own ThreadPool implementation. I don't want to do that, because I'm lazy. So, is there a simple solution already out there? Currently I'm constrained to using the 3.5 CLR. I know a lot of this stuff becomes easier in 4.0.

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• How can I embed firefox in a GUI application?

  - by PeniWize

  Has anyone ever embedded the firefox web browser technology in their own [unmanaged] C/C++ GUI application in the same way that IE can be embedded as a COM object? (I would like to do this on Linux, not Windows). Are there "better" alternatives to firefox? I'm open to anything as long as I can use it with non-GPL code. My needs are fairly basic; I only need fundamental HTML parsing and display of static local files, but I'd take advantage of more sophisticated technology, if I can get it. I'd like to be able to use JavaScript, but I can get by without it.

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• Scala wont pattern match with java.lang.String and Case Class

  - by Stefan

  Hello fellow Scala Programmers I have been working with Scala for some month now, however I have a problem with some properly basic stuff, I am hoping you will help my out with it. case class PersonClass(name: String, age: Int) object CaseTester { def main(args:Array[String]) { val string = "hej" string match { case e:String => println(string) case PersonClass => println(string) } } } When I am doing like this I get error: pattern type is incompatible with expected type; found : object PersonClass required: java.lang.String case PersonClass = println(string) And if I then change the second line in the pattern matching to the following: case e:PersonClass => println(string) I then get the error: error: scrutinee is incompatible with pattern type; found : PersonClass required: java.lang.String case e:PersonClass = println(string) However if I change the string definition to the following it compiles fine in both cases. val string:AnyRef = "hej"

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• Memory management in Qt?

  - by Martin

  I'm quite new to Qt and am wondering on some basic stuff with memory management and the life of objects. When do I need to delete / destroy my objects? Is any of this handled automatically? In the example below, which of the objects I create do I need to delete? What happens to the instance variable myOtherClass when myClass is destroyed? What happens if I don't delete / destroy my objects at all, will that be a problem to memory? in MyClass.h: class MyClass { public: MyClass(); ~MyClass(); MyOtherClass *myOtherClass; }; in MyClass.cpp: MyClass::MyClass() { myOtherClass = new MyOtherClass(); MyOtherClass myOtherClass2; QString myString = "Hello"; } As you can see this is quite newbie-easy stuff but where can I learn about this in an easy way? Thanks really much

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• How do I link a Navigation Menu to an already existing Sitemap

  - by JMK

  I am just beginning my journey into web development and I have a very basic question, but I am none the less stumped. I have setup a new ASP.NET Empty Web Application. In this application, I have created a few *.aspx pages and a sitemap called 'Web.sitemap'. I have placed a SiteMapPath control onto my Master page and, with no further configuration, this detected my Web.sitemap and displays the location of the page on any *.aspx page which derives from the master page. However, whenever I add a Navigation Menu, this doesn't happen. When I bring up the Menu Tasks dialogue box, I can't select this from the Choose Data Source dropdown, my only option is to choose <New data source...> which brings up the Data Source Configuration Wizard, and from this I can create a new Site Map, however I want to use the already existing one. How do I go about this? Thanks

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• How to limit a google calendar xml / rss feed by date range (not working!!)

  - by Phil

  For the life of me I cannot get my google calendar xml feed to only display events within a certain date range. I know that start-min and start-max are supposed to limit the output (according to these posts: (links to posts deleted because I am a newbie and can only post one hyperlink argh) BUT I CAN'T GET IT TO WORK. It keeps showing lot of things outside the range. I created a sample calendar and made it public. It is some events the first week of april. Can anyone show me how to construct a request that only returns those three events from the first week in april? I'll GLADLY and GRATEFULLY paypal $10 to anyone who helps me break through on this. Here is the calendar's public feed: http://www.google.com/calendar/feeds/66m31c36sj9u5k8kekrvt2lpr8%40group.calendar.google.com/public/basic

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• How to prevent a modal UIImagePickerController from rotating?

  - by coneybeare

  I have an app that fully support rotation. I am modally adding a UIImagePickerController for which there is no support for UIInterfaceOrientationLandscape and I cannot get the controller to stay in portrait. In other words, I need to disable rotation for the UIImagePickerController so it stays in portrait, without removing rotation for the rest of my app. this seems basic, but I can't seem to locate it. How can I prevent this rotation? UPDATE As suggested, I tried subclassing with the following code: @interface UAImagePickerController : UIImagePickerController { } @end @implementation UAImagePickerController - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation { return UIDeviceOrientationIsPortrait(toInterfaceOrientation); } @end The line is not being hit at all with a breakpoint… i think there must be something funky about the UIImagePickerView

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• Recovering the deleted data from Android SD Card ?

  - by Nish

  I am trying to make an Android application which would try to recover deleted content from the SD Card. How feasible it is ? I have following method in mind: 1) Since, the files are not actually deleted, can I access the file system to see files which has been marked to be overwritten. 2) Or will I have do header/footer file carving ? Is it possible from the application layer of android ? I am concerned about files stored on contiguous sectors and not the fragmented once. I want to do a basic file retrieval. Please let me know some resources which I can use to make this application ?

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• IIS6 Virtual Directory 500 Error on Remote Share

  - by David Boike

  We have our servers at the server farm in a domain. Let's call it LIVE. Our developer computers live in a completely separate corporate domain, miles and miles away. Let's call it CORP. We have a large central storage unit (unix) that houses images and other media needed by many webservers in the server farm. The IIS application pools run as (let's say) LIVE\MediaUser and use those credentials to connect to a central storage share as a virtual directory, retrieve the images, and serve them as if they were local on each server. The problem is in development. On my development machine. I log in as CORP\MyName. My IIS 6 application pool runs as Network Service. I can't run it as a user from the LIVE domain because my machine isn't (and can not be) joined to that domain. I try to create a virtual directory, point it to the same network directory, click Connect As, uncheck the "Always use the authenticated user's credentials when validating access to the network directory" checkbox so that I can enter the login info, enter the credentails for LIVE\MediaUser, click OK, verify the password, etc. This doesn't work. I get "HTTP Error 500 - Internal server error" from IIS. The IIS log file reports sc-status = 500, sc-substatus = 16, and sc-win32-status = 1326. The documentation says this means "UNC authorization credentials are incorrect" and the Win32 status means "Logon failure: unknown user name or bad password." This would be all and good if it were anywhere close to accurate. I double- and trouble-checked it. Tried multiple known good logins. The IIS manager allows me to view the file tree in its window, it's only the browser that kicks me out. I even tried going to the virtual directory's Directory Security tab, and under Authentication and Access Control, I tried using the same LIVE domain username for the anonymous access credential. No luck. I'm not trying to run any ASP, ASP.NET, or other dynamic anything out of the virtual directory. I just want IIS to be able to load static images, css, and js files. If anyone has some bright ideas I would be most appreciative!

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• Databases design - one link table or multiple link tables?

  - by David

  Hi there, I'm working on a front end for a database where each table essentially has a many to many relationship with all other tables. I'm not a DB admin, just a few basic DB courses. The typical solution in this case, as I understand it, would be multiple link tables to join each 'real' table. Here's what I'm proposing instead: one link table that has foreign key dependencies to all other PKs of the other tables. Is there any reason this could turn out badly in terms of scalability, flexibility, etc down the road?

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• ASP.NET MVC & ADO.NET Entity Framework clientside validation

  - by JK

  Using aspnet mvc2 with the model auto-generated by entity framework: Is it possible to tell entity framework to auto-annotate all fields? eg: If database field says not null then add [Required] If DB field is a nvarchar(x) then add [StringLength(x)] And so on? What if the field name contains the string "email" eg CustomerEmail - can I get EF to auto-annotate that with an appropriate annotation ([Regex()] maybe) As I understand it, if the model fields are annotated, and I use both Html.ValidationMessageFor() and use if (ModelState.IsValid) in my controller, then that is all I need to do to have basic clientside input validation working? Thanks

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• How to learn flex?

  - by Zenzen

  So I'm starting an internship as a Flex developer in ~2weeks thanks to a friend of mine. The thing is I know squat about Flex - it is an internship after all so I'm supposed to learn there, but nonetheless I want to have some basic understanding of Flex before I start (eventually I want to become a JEE/Flex dev). So my question is simple, which book(s) would you recommend me to start with? Are there any "must have" books, like let's say "Thinking in C++" for C++ etc.? I already heard about a few video tutorials and I will surely check them out but I'd also want to get some decent books.

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• What is application and process?

  - by Lu Lu

  An application consists of one or more processes. A process, in the simplest terms, is an executing program. One or more threads run in the context of the process. A thread is the basic unit to which the operating system allocates processor time. A thread can execute any part of the process code, including parts currently being executed by another thread. Source: http://msdn.microsoft.com/en-us/library/ms684841%28VS.85%29.aspx I understand about thread, but I can't distinguish between application & process. What is application? What is process? How do an application have more than 1 process? And please give me an example in C#. Thanks.

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• When running a shell script, how can you protect it from overwriting or truncating files?

  - by Joseph Garvin

  If while an application is running one of the shared libraries it uses is written to or truncated, then the application will crash. Moving the file or removing it wholesale with 'rm' will not cause a crash, because the OS (Solaris in this case but I assume this is true on Linux and other *nix as well) is smart enough to not delete the inode associated with the file while any process has it open. I have a shell script that performs installation of shared libraries. Sometimes, it may be used to reinstall versions of shared libraries that were already installed, without an uninstall first. Because applications may be using the already installed shared libraries, it's important the the script is smart enough to rm the files or move them out of the way (e.g. to a 'deleted' folder that cron could empty at a time when we know no applications will be running) before installing the new ones so that they're not overwritten or truncated. Unfortunately, recently an application crashed just after an install. Coincidence? It's difficult to tell. The real solution here is to switch over to a more robust installation method than an old gigantic shell script, but it'd be nice to have some extra protection until the switch is made. Is there any way to wrap a shell script to protect it from overwriting or truncating files (and ideally failing loudly), but still allowing them to be moved or rm'd? Standard UNIX file permissions won't do the trick because you can't distinguish moving/removing from overwriting/truncating. Aliases could work but I'm not sure what entirety of commands need to be aliased. I imagine something like truss/strace except before each action it checks against a filter whether to actually do it. I don't need a perfect solution that would work even against an intentionally malicious script. Ideas I have so far: Alias cp to GNU cp (not the default since I'm on Solaris) and use the --remove-destination option. Alias install to GNU install and use the --backup option. It might be smart enough to move the existing file to the backup file name rather than making a copy, thus preserving the inode. "set noclobber" in ~/.bashrc so that I/O redirection won't overwrite files

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• How to move from untyped DataSets to POCO\LINQ2SQL in legacy application

  - by artvolk

  Good day! I've a legacy application where data access layer consists of classes where queries are done using SqlConnection/SqlCommand and results are passed to upper layers wrapped in untyped DataSets/DataTable. Now I'm working on integrating this application into newer one where written in ASP.NET MVC 2 where LINQ2SQL is used for data access. I don't want to rewrite fancy logic of generating complex queries that are passed to SqlConnection/SqlCommand in LINQ2SQL (and don't have permission to do this), but I'd like to have result of these queries as strong-typed objects collection instead of untyped DataSets/DataTable. The basic idea is to wrap old data access code in a nice-looking from ASP.NET MVC "Model". What is the fast\easy way of doing this?

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• Haskell as REST server

  - by Dev er dev

  I would like to try Haskell on a smallish project which should be well suited to it. I would like to use it as a backend to a small ajax application. Haskell backend should be able to do authentication (basic, form, whatever, ...), keep track of user session (not much data there except for username) and to dispatch request to handlers based on uri and request type. It should also be able to serialize response to both xml and json format, depending on request parameter. I suppose the handlers are ideally suited for Haskell, since the service is basically stateless, but I don't know where to start for the rest of the story. Searching hackage didn't give me much hints.

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• Is there a Java API for creating a XHTML document?

  - by Bedwyr Humphreys

  I want to provide a simple XHTML representation of each of the resources in a REST web service. At the moment i'm using a StringBuilder to generate these which is both tedious and error prone. I don't see these changing after I publish the service but the process of coding each is a bit painful. Is there a XHTML document writer api? Should I just use an XML writer? Which one? Should I just roll my own basic HTML document class - doctype is the same each time, i just need to set the title, metatags and body content, most of which (but not all content) is already in HTML for the GETs. Or should I just use StringBuilder and stop whining? ;) Thanks.

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• InstallShield 2009: Remove a dll (being used by explorer.exe for context menu) during uninstall with

  - by Samir

  Install Shield Premier 2009: Basic MSI Project I have a dll that is supposed to be removed during uninstall. But this dll is being used by explorer.exe, it is used for generating windows explorer context menus with their icons(same as the menu items, icons we see when we right click on any file/folder and see the WinRAR items, icons). Manually, I have to unregister the dll and close explorer.exe from task manager and again run explorer.exe. Then I can delete the dll. So from Install Shield how to delete this dll without any problem(as we see while uninstalling WinRAR or other software there is no problem no message boxes shown and the related context menu icons also removed).

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• Getting the height of text to know fill height as in TCPDF

  - by sami

  I'm trying to go through the code of TCPDF to understand how it calculates the height of the text to be rendered, but it's too much for me to handle without asking. What I want to know: in the PDF from example 5 http://www.tcpdf.org/examples/example_005.pdf it gives the cell a yellow background. I'm guessing that at the basic level, it first draws a box with this fill color, then adds the text, so what method is it calling to get the height of the text to know the height of the box to fill? Anyone knows how to trace this, because doing it by hand and looking through the code isn't working at all for me.

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• iptables management tools for large scale environment

  - by womble

  The environment I'm operating in is a large-scale web hosting operation (several hundred servers under management, almost-all-public addressing, etc -- so anything that talks about managing ADSL links is unlikely to work well), and we're looking for something that will be comfortable managing both the core ruleset (around 12,000 entries in iptables at current count) plus the host-based rulesets we manage for customers. Our core router ruleset changes a few times a day, and the host-based rulesets would change maybe 50 times a month (across all the servers, so maybe one change per five servers per month). We're currently using filtergen (which is balls in general, and super-balls at our scale of operation), and I've used shorewall in the past at other jobs (which would be preferable to filtergen, but I figure there's got to be something out there that's better than that). The "musts" we've come up with for any replacement system are: Must generate a ruleset fairly quickly (a filtergen run on our ruleset takes 15-20 minutes; this is just insane) -- this is related to the next point: Must generate an iptables-restore style file and load that in one hit, not call iptables for every rule insert Must not take down the firewall for an extended period while the ruleset reloads (again, this is a consequence of the above point) Must support IPv6 (we aren't deploying anything new that isn't IPv6 compatible) Must be DFSG-free Must use plain-text configuration files (as we run everything through revision control, and using standard Unix text-manipulation tools are our SOP) Must support both RedHat and Debian (packaged preferred, but at the very least mustn't be overtly hostile to either distro's standards) Must support the ability to run arbitrary iptables commands to support features that aren't part of the system's "native language" Anything that doesn't meet all these criteria will not be considered. The following are our "nice to haves": Should support config file "fragments" (that is, you can drop a pile of files in a directory and say to the firewall "include everything in this directory in the ruleset"; we use configuration management extensively and would like to use this feature to provide service-specific rules automatically) Should support raw tables Should allow you to specify particular ICMP in both incoming packets and REJECT rules Should gracefully support hostnames that resolve to more than one IP address (we've been caught by this one a few times with filtergen; it's a rather royal pain in the butt) The more optional/weird iptables features that the tool supports (either natively or via existing or easily-writable plugins) the better. We use strange features of iptables now and then, and the more of those that "just work", the better for everyone.

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• Getting text from image on ios (image processing)

  - by Vikram.exe

  Hi, I am thinking of making an application that requires extracting TEXT from an image. I haven't done any thing similar and I don't want to implement the whole stuff on my own. Is there any known library or open source code (supported for ios, objective-C) which can help me in extracting the text from the image. A basic source code will also do (I will try to modify it as per my need). Kindly let me know if some one has any idea on this. Thanks, Vikram

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• switch to mysqli a good idea?

  - by Rob

  I'm considering switching to mysqli for all my php projects. The way my code is written (I run very simple websites and built my own basic framework which I use across all of them) I shouldn't have too many problems modifying the functions and classes. However, i've only heard positive things about prepared statements, bar a few grumblings about the php functions available, most notably the lack of a simple replacement for using mysql_fetch_array in a while. This sounds a bit too good to be true, so I wondered if anyone could highlight some of the issues with using prepared statements, such as speed and resource usage.

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• Dynamic Chart Series Labels

  - by McVey

  I have some Visual Basic Code that creates a chart for each row. It sets the series values using this code: .SeriesCollection(1).Values = "=" & Ws.Name & "!R" & CurrRow & "C3:R" & CurrRow & "C8" What I am struggling with is how do I set the series labels? The series labels will always be the 1st row and be in the corresponding column. I know this is much simplier than the code above, but I am stumped. Any help is appreciated.

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• Is SynchronizationContext.Post() threadsafe?

  - by cyclotis04

  This is a pretty basic question, and I imagine that it is, but I can't find any definitive answer. Is SynchronizationContext.Post() threadsafe? I have a member variable which holds the main thread's context, and _context.Post() is being called from multiple threads. I imagine that Post() could be called simultaneously on the object. Should I do something like lock (_contextLock) _context.Post(myDelegate, myEventArgs); or is that unnecessary? Edit: MSDN states that "Any instance members are not guaranteed to be thread safe." Should I keep my lock(), then?

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