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• Linux: Limiting data throughput (pipe) in bytes per second?

  - by sdaau

  Hi all, I was wandering if there is a Linux program that can limit data throughput of a pipe - in actual bytes per second?. From what I gather, applicable for the purposes would be bfr, however, it has been removed from Debian (Removal candidate: bfr) cpipe, however, it seems the lowest resolution it will support is kB/s, meaning that buffer writes can still reach MB/s ([SOLVED] Is there a program to limit terminal pipe speed? - Page 2 - Ubuntu Forums) What I'd want is to be able to specify something like cat example.txt | ratelimit -Bps 100 > /dev/ttyUSB0 ... and actually have a single byte from example.txt sent each 1/100 = 0.01 sec (or 10 ms) to 'output'.. Thanks in advance for any suggestions, Cheers!

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• how to master in Windows administration [closed]

  - by Mateusz

  what is, in your opinion, best way to become real Windows, advanced administrator? Of course it's possible to obtain MS Certificates, but they're rather very expensive. Almost two years of everyday working on Linux machine, teach me, that it's very important to read system logs. Anyway, I assume that it's enough - I think that you must be familiar with almost any hive in you registry and each trick in Windows CMD and VBS- although it's high time for PowerShell, still on many maschines, you have only an opprotunity of using CMD by default (and their owners are reluctant to install anything else). How I can accomplish this task? Which groups follows (superUser - it' obligatory), which articles read?

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• Jquery Append() and remove() element

  - by BandonRandon

  Hi, I have a form where I'm dynamically adding the ability to upload files with the append function but I would also like to be able to remove unused fields. Here is the html markup <span class="inputname">Project Images: <a href="#" class="add_project_file"><img src="images/add_small.gif" border="0"></a></span> <span class="project_images"> <input name="upload_project_images[]" type="file" /><br/> </span> Right now if they click on the "add" gif a new row is added with this jquery $('a.add_project_file').click(function() { $(".project_images").append('<input name="upload_project_images[]" type="file" class="new_project_image" /> <a href="#" class="remove_project_file" border="2"><img src="images/delete.gif"></a><br/>'); return false; }); To remove the input box i've tried to add the class "remove_project_file" then add this function. $('a.remove_project_file').click(function() { $('.project_images').remove(); return false;}); I think there should be a much easier way to do this. Maybe i need to use the $(this) function for the remove. Another possible solution would be to expand the "add project file" to do both adding and removing fields. Any of you JQuery wizards have any ideas that would be great

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• Time randomly changing itself, internet randomly dying

  - by Vee

  Operating System MS Windows 8 Enterprise 64-bit CPU Intel Core i7 2700K @ 3.50GHz 45 °C Sandy Bridge 32nm Technology RAM 8,00 GB Dual-Channel DDR3 @ 800MHz (8-8-8-24) Motherboard ASRock Z77 Extreme4-M (CPUSocket) 40 °C Graphics SMXL2270HD (1920x1080@60Hz) M2094D-PZ (1680x1050@60Hz) 896MB GeForce GTX 275 (CardExpert Technology) 57 °C Hard Drives 466GB FUJITSU MAXTOR STM3500320AS (SATA) 39 °C Optical Drives ASUS DRW-2014L1T Audio High Definition Audio Device Hello everyone, I installed Windows 8 RTM a few weeks ago. It's not my first time installing it, but it's the first time having two annoying problems: 1) Randomly, the system clock changes time all by itself - to fix it I have to open the time window and sync it with the internet. 2) Randomly, internet connection stops working - to fix I have to run troubleshooting. Windows will find a problem with IP on the "Ethernet" connection and fix it. 3) In rare occasions, my PC freezes and I need to restart it (a BSOD once happened, but after that only freezes) How can I permanently solve these problems? This is what I've already tried: Reset Virus scan Stop/reset the Windows Time service Disable/re-enable Windows Time automatic internet sync Change time from BIOS Change motherboard battery

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• Writing an audio player in C#

  - by Malki

  Hi, I have a pretty cool idea for a very special media player. I like to think about this project as a mini-startup, since I don't yet know if my idea is practical. Anyways, before implementing my idea, I first need to be able to implement a simple audio player. My preferred language for this project is C#, simply because it's so easy to use, but any other object oriented language would be fine too I guess. I started out with no knowledge whatsoever about audio. My main goals right now are: Being able to play audio files - as many formats as possible (sort of a VLC type player, but only audio for now). Being able to analyze audio files - as in, reading frequency, amplitude, volume, and other information about the audio. I think maybe a good idea here is to be able to analyze one file format (PCM?), and then temporarily converting any file I want to analyze to that format. This is in order to later implement a mechanism that compares songs and identifies similar songs to recommend to the user (this feature isn't part of my idea, but I figured since it exists in many players nowadays, I need to have it too if I want be able to compete with them). BTW - I currently don't have any knowledge about audio/wavelengths/frequencies and such, so I'd appreciate it if someone could point me in the right direction about this analyzation feature. Maybe in the future I'd expand to playing video files as well, but for now I'm concentrating on audio. After searching the Internet for a while, I've come across LAME. Problem is, it's not C#, and I'm not sure how to use it. I know there is something called "Interoperability", that is supposed to let me work with native DLL files through C#. Any information about that would be helpful as well. Any help would be much appreciated. Thanks, Malki :)

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• Maven + SSDM Build and Runtime Environment Automation

  - by Randy

  Preface: My Company, like most, has several run-time environments and several release versions which themselves are composed of different versions of various jars. For example, let us consider release versions 1.1, 1.2, and 1.3 of Software X, which may be deployed to a developer computer, testing, or production. Software-x-1.1 is itself composed of jarA-0.9.1 and jarB-0.7.5, but software-x-1.3 is composed of jarA-1.7.31 and jarB-0.8.1. Currently we use Spring's PropertyPlaceholderConfigurer to configure run-time variables (such as database credentials), however, properties also change with release versions. We also use Maven 2 POM version 4 to specify which versions of our code need to be used. We place the version numbers of our jars as properties within profiles (dev,test,prod) inside of the parent pom and then reference those version numbers in all project poms. As of right now, we have no way to specify which project versions pertain to a given release other than the most current one. Moreover, we deploy our run-time configurations to the SSDM pickup which then configures and creates the services defined by the built versions of our software. -- Questions: Is there any procedure/tool we can use to build our product by merely providing the run-time environment and version number? IE "build 1.1 dev"? Is there anyway we can store the required jar versions for each release build? We are currently versioning all files, including the parent pom, but merely versioning the parent pom does not record which release version is pertinent to that parent pom. What else can we do to further automate the process of builds? For example, if we could manage run-time configurations within the parent pom that would be a step in the right direction, but that seems like a violation of scope. Any tool outside of our framework is inconceivable at this point, but not in the far future. Summary: How can we automate our build process to the fullest extent without being error prone?

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• ASP.NET MVC (VB) error when publishing to test server

  - by Colin

  I have an ASP.NET MVC project that works fine on my local machine (no build errors, server errors or anything). However, when I publish the project to a test server, I get an "Object reference not set to an instance of an object" error on a For Each I have in my view. I have a function within a model that returns a DataRowCollection. I'm calling that function in my controller and passing the DataRowCollection to my View, which then iterates over the rows and displays the necessary information: In the Controller I have: Function Index() As ActionResult Dim MyModel As New Model ViewData("MyDataRowCollection") = MyModel.GetDataRowCollection() Return View() End Function And then in the View, which is throwing the error: <%@ Page Language="VB" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> <asp:Content ID="indexTitle" ContentPlaceHolderID="TitleContent" runat="server"> My Page Title </asp:Content> <asp:Content ID="indexContent" ContentPlaceHolderID="MainContent" runat="server"> <% For Each MyDataRow In ViewData("MyDataRowCollection") ' do stuff with each MyDataRow Next %> I'm pretty new to ASP.NET MVC so I'm sure there might be a better way to do what I'm doing (I'd be happy to hear if there is), but my main concern is why this works fine on my local machine but throws an error on the For Each on the test server? Please let me know if I can clarify any of the above, and thanks in advance for any information.

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• Why does HDTune report better performing drives 2 months after installing them?

  - by Rolnik

  OK, so this is really weird. I ran HDTune on a newly set-up home-built computer and got the following readings from my drives in mid-November. SSD 154 MB/s RAID1 87 RAID0 198 (software installs) RAID0 98 Swap drive Today, in January, I run HDTune (same version) and get these results, in MB/s: SSD 186 RAID1 98 RAID0 241 RAID0 98 (Swap drive) Here are more details that HDTune reports on the SSD drive: HD Tune: OCZ-VERTEX Benchmark Blockquote Transfer Rate Minimum : 135.4 MB/sec Transfer Rate Maximum : 219.4 MB/sec Transfer Rate Average : 185.7 MB/sec Access Time : 0.1 ms Burst Rate : 187.3 MB/sec CPU Usage : -1.0% To get to my question: Why are my hard drives improving in performance? Most of my logical drives are in some form of RAID, except for the SSD. Will this performance ever deteriorate? Note, none of my drives are a hybrid drive that uses some form of SSD to enhance the write/reads on actual platters.

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• Virtual Windows Servers and Pagefile location [closed]

  - by Luke Puplett

  Considering that Windows makes heavy use of the pagefile even with huge amounts of RAM available, is it not best to have this pagefile on the fastest disk possible as close to the virtual systems as possible? I'm thinking, RAM disk. Where I work, storage for VMs is out on a NAS/SAN. I'm worried that so much memory access is having to go across the network! As a side, I think its about time MS got rid of paging and told us to buy more DIMMS. UPDATE So this question has been downvoted??! Accessing a local spindle is C40,000 times slower than a DIMM, so going over the network will be even slower for hard faults. I don't know why I got the downvote, I'm certain that this is an issue unless there's some other mechanism in ESX/HyperV that manages this.

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• Get an yerror plot without a line in Octave

  - by queueoverflow

  I'd like to print a plot with y-error-bars and just plain points. My current Octave script looks like this: errorbar(x_list, y_list, Delta_y_list, "~.x"); title("physikalisches Pendel"); xlabel("a^2 [m^2]"); ylabel("aT^2 [ms^2]"); print -dpdf plot.pdf The plot I get has a line, although I specified the .x style option: How can I get rid of that line? And the ylabel is in the scale as well, is there some way to fix that?

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• Reasonably faster way to traverse a directory tree in Python?

  - by Sridhar Ratnakumar

  Assuming that the given directory tree is of reasonable size: say an open source project like Twisted or Python, what is the fastest way to traverse and iterate over the absolute path of all files/directories inside that directory? I want to do this from within Python (subprocess is allowed). os.path.walk is slow. So I tried ls -lR and tree -fi. For a project with about 8337 files (including tmp, pyc, test, .svn files): $ time tree -fi > /dev/null real 0m0.170s user 0m0.044s sys 0m0.123s $ time ls -lR > /dev/null real 0m0.292s user 0m0.138s sys 0m0.152s $ time find . > /dev/null real 0m0.074s user 0m0.017s sys 0m0.056s $ tree appears to be faster than ls -lR (though ls -R is faster than tree, but it does not give full paths). find is the fastest. Can anyone think of a faster and/or better approach? On Windows, I may simply ship a 32-bit binary tree.exe or ls.exe if necessary. Update 1: Added find

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• MySQL " identify storage engine statement"

  - by sammysmall

  This IS NOT a Homework question! While building my current student database project I realized that I may want to identify comprehensive information about a database design in the future. More-so if I am fortunate enough to get a job in this field and were handed a database project how could I break down certain elements for identification... In all of my previous designs I have been using MySQL Community Server (GPL) 5.1.42, I thought (duh) that I was using the MyISAM based on most of my text-book instruction and MySQL 5.0 Reference Manual :: 13 Storage Engines :: 13.1 The MyISAM Storage Engine I determined that this was in fact incorrect for this version and the use of "SHOW ENGINES" at the console... No problem, figured out why they have "versions" the need to pay attention to what version is being used, and the need for a means to determine what I am about to mess up "if" I do not pay attention to detail... Q1. Specifically what statement will identify the version used by someone elses initial database creation? (since I created my own databases I know what version I used) Q2. Specifically what statement will identify the storage engine that the developer used when creating the database. (I specified a particular database in my collection then tried SHOW Engine, did not work, then tried to just get the metadata from one table in that database: mysql SELECT duck_cust, table_type, engine - FROM INFORMATION_SCHEMA.tables - WHERE table_schema = 'tp' - ORDER BY table_type ASC, table_name DESC; as this was not really what I wanted (and did not work) I am looking for some direction from the pros... Q3. (If you really have the inclination to continue helping) If I were to access a database from an earlier/later "version" are there backward/forward compatibility issues for maintaining/updating data between versions? Please and Thank you in advance for your time and efforts! sammysmall

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• Tab bar application with UINavigation Controller MOC not being retained.

  - by iamsmug

  I created a tab bar application from the template and added a navigation controller to one of the tabs. I have already created this app from the navigation app template already and is working. The reason I am doing it this way is because I need to add a tab bar and thought it would be easier starting by using the tab bar project template and adding the nav controller to it rather than the other way round. I have copied the data model over from the other project and added the relevant code to where it should be. The problem I am having is passing the moc from the app delegate to the tab with the nav controller on. Here is a snippet from my applicationDidFinishLaunching method in my app delegate: - (void)applicationDidFinishLaunching:(UIApplication *)application { [self createEditableCopyOfDatabaseIfNeeded]; Top_BananaTableViewController *top_BananaTableViewController = (Top_BananaTableViewController *)[navigationController topViewController]; top_BananaTableViewController.managedObjectContext = self.managedObjectContext; // Add the tab bar controller's current view as a subview of the window [window addSubview:tabBarController.view]; [window makeKeyAndVisible]; } Everything seems fine here but when it comes to the fetchedResultsController on my nav controller view it bombs out with: '+entityForName: could not locate an NSManagedObjectModel for entity name 'cards'' When I checked what was set to my managedObjectContext on that view it was null. I don't know why or where it is loosing it's setting. Please help.

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• Windows 2008 Enterprise License can't activate Standard Edition

  - by starchx

  We have downloaded and installed the Windows 2008 Standard R2 edition months ago. Now the server is in production. We signed up the Microsoft Partnership Action Pack subscription last week and get a license for Windows 2008 Enterprise edtion. I am trying to activate the standard edition with Enterprise key as advsied here:http://serverfault.com/questions/318968/upgrade-domain-controller-sku-from-server-2008-r2-standard-to-enterprise , but failed. Is it because windows 2008 we have is different? (downloaded from MS site with eval license). Thanks. tim

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• C callback functions defined in an unnamed namespace?

  - by Johannes Schaub - litb

  Hi all. I have a C++ project that uses a C bison parser. The C parser uses a struct of function pointers to call functions that create proper AST nodes when productions are reduced by bison: typedef void Node; struct Actions { Node *(*newIntLit)(int val); Node *(*newAsgnExpr)(Node *left, Node *right); /* ... */ }; Now, in the C++ part of the project, i fill those pointers class AstNode { /* ... */ }; class IntLit : public AstNode { /* ... */ }; extern "C" { Node *newIntLit(int val) { return (Node*)new IntLit(val); } /* ... */ } Actions createActions() { Actions a; a.newIntLit = &newIntLit; /* ... */ return a; } Now the only reason i put them within extern "C" is because i want them to have C calling conventions. But optimally, i would like their names still be mangled. They are never called by-name from C code, so name mangling isn't an issue. Having them mangled will avoid name conflicts, since some actions are called like error, and the C++ callback function has ugly names like the following just to avoid name clashes with other modules. extern "C" { void uglyNameError(char const *str) { /* ... */ } /* ... */ } a.error = &uglyNameError; I wondered whether it could be possible by merely giving the function type C linkage extern "C" void fty(char const *str); namespace { fty error; /* Declared! But i can i define it with that type!? */ } Any ideas? I'm looking for Standard-C++ solutions.

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• Can I get the amount of time for which a key is pressed on a keyboard

  - by Adi

  Dear all, I am working on a project in which I have to develop bio-passwords based on user's keystroke style. Suppose a user types a password for 20 times, his keystrokes are recorded, like holdtime : time for which a particular key is pressed. digraph time : time it takes to press a different key. suppose a user types a password " COMPUTER". I need to know the time for which every key is pressed. something like : holdtime for the above password is C-- 200ms O-- 130ms M-- 150ms P-- 175ms U-- 320ms T-- 230ms E-- 120ms R-- 300ms The rational behind this is , every user will have a different holdtime. Say a old person is typing the password, he will take more time then a student. And it will be unique to a particular person. To do this project, I need to record the time for each key pressed. I would greatly appreciate if anyone can guide me in how to get these times. Editing from here.. Language is not important, but I would prefer it in C. I am more interested in getting the dataset.

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• git-diff to ignore ^M

  - by neoneye

  In a project where some of the files contains ^M as newline separators. Diffing these files are apparently impossible, since git-diff sees it as the entire file is just a single line. How does one diff with the previous version? Is there an option like "treat ^M as newline when diffing" ? prompt> git-diff "HEAD^" -- MyFile.as diff --git a/myproject/MyFile.as b/myproject/MyFile.as index be78321..a393ba3 100644 --- a/myproject/MyFile.cpp +++ b/myproject/MyFile.cpp @@ -1 +1 @@ -<U+FEFF>import flash.events.MouseEvent;^Mimport mx.controls.*;^Mimport mx.utils.Delegate \ No newline at end of file +<U+FEFF>import flash.events.MouseEvent;^Mimport mx.controls.*;^Mimport mx.utils.Delegate \ No newline at end of file prompt> UPDATE: now I have written a script that checks out the latest 10 revisions and converts CR to LF. require 'fileutils' if ARGV.size != 3 puts "a git-path must be provided" puts "a filename must be provided" puts "a result-dir must be provided" puts "example:" puts "ruby gitcrdiff.rb project/dir1/dir2/dir3/ SomeFile.cpp tmp_somefile" exit(1) end gitpath = ARGV[0] filename = ARGV[1] resultdir = ARGV[2] unless FileTest.exist?(".git") puts "this command must be run in the same dir as where .git resides" exit(1) end if FileTest.exist?(resultdir) puts "the result dir must not exist" exit(1) end FileUtils.mkdir(resultdir) 10.times do |i| revision = "^" * i cmd = "git show HEAD#{revision}:#{gitpath}#{filename} | tr '\\r' '\\n' > #{resultdir}/#{filename}_rev#{i}" puts cmd system cmd end

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• Is there way to enable 4 GB RAM in 32-bit Windows OS?

  - by Wahid Bitar

  I upgraded my PC to 4 GB RAM and I get only 3 GB. Windows 7 32-Bit consider that I've 4 GB RAM but didn't use more than 3 GB. Someone told me that MS Windows 32-bit doesn't support RAM larger than 3 GB. So please is there any way to make my OS "Windows 7 32-Bit" support more than 3 GB RAM ? *`Note: I can't move to 64-bit because I've many program doesn't work with a 64-bit OS. Edit:: I tried what Mr. Wonsungi advised me but whenever I check this option: Enable support for 4 GB of RAM I get the following error: 'Cannot access to the registry key HKEY_CLASSES_ROOT\CLSID\{E88DCCE0-11d1-A9F0-00AA0060FA31}.' There is no "CLSID" in my registry, I don't know why!.

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• Which compiler option I should choose?

  - by Surjya Narayana Padhi

  Hi Geeks, I have to use the third party static library for my qt application to run on windows. The third party provides me a .lib and .h file for use. These libraries are compiled with MSVC compiler. My qt Creator is using MinGW compiler to compile my application. I copied the .h and .lib file to my qt project directory and then added those in .pro file as follows QT += core gui TARGET = MyTest TEMPLATE = app LIBS += C:\Qt\2010.05\qt\MyTest\newApi.lib SOURCES += main.cpp\ mainwindow.cpp HEADERS += mainwindow.h \ newApi.h FORMS += mainwindow.ui Now I am getting some runtime error like this - Starting C:\Qt\2010.05\qt\MyTest-build-desktop\debug\MyTest.exe... C:\Qt\2010.05\qt\MyTest-build-desktop\debug\MyTest.exe exited with code -1073741515 Can any body suggest is this runtime error is due to mismatch of compiler? (because of my .lib file I added is comipled in MSVC compiler and my qt app is compiled using MinGW compiler) If not what may be the reason? Am I missing anything in adding the .h and .lib file to my qt project? If my MinGW compiler will not support the .lib file generated in MSVC compiler what may be the work-arround? Can I create the .lib files in MinGW compiler? or this format is supported only by MSVC compiler only? Please suggest...

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• Scratch the screen to display an image in android

  - by user1008497

  i am working on a android project for my assignment. i am trying to make a scratch image application, you know it's like we scratch the screen to get rid the blocking layer to display the image. but the problem is i don't know where to start. i have searching in stackoverflow's questions that related to this but that's not help. from my search there, i found a clue for this project is using Bitmap.getPixel(int x, int y). so, in my thought i have to get pixel from bitmap and paint it to canvas. but i don't know how to implement it? or anyone has a better method for this? Could anyone please help me? Any tutorials on this kind of thing or related topics? Thanks in advance! here's my sample code: @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); tw = w; th = h; eraseableBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); mCanvas = new Canvas(eraseableBitmap); Bitmap muteableBitmap = Bitmap.createBitmap(eraseableBitmap.getWidth(), eraseableBitmap.getHeight(), Bitmap.Config.ARGB_8888); } @Override public boolean onTouchEvent(MotionEvent event) { static_x = event.getX(); static_y = event.getY(); if (event.getAction() == MotionEvent.ACTION_DOWN) { touch_start(static_x, static_y); } if (event.getAction() == MotionEvent.ACTION_MOVE) { touch_move(static_x, static_y); } if (event.getAction() == MotionEvent.ACTION_UP) { touch_up(); } return true; }

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• MYSQL JOIN WHERE ISSUES - need some kind of if condition

  - by Breezer

  Hi Well this will be hard to explain but ill do my best The thing is i have 4 tables all with a specific column to relate to eachother. 1 table with users(agent_users) , 1 with working hours(agent_pers), 1 with sold items(agent_stat),1 with project(agent_pro) the user and the project table is irrelevant in the issue at hand but to give you a better understanding why certain tables is included in my query i decided to still mention them =) The thing is that I use 2 pages to insert data to the working hour and the sold items during that time tables, then i have a third page to summarize everything for current month, the query for that is as following: SELECT *, SUM(sv_p_kom),SUM(sv_p_gick),SUM(sv_p_lunch) FROM (( agent_users LEFT JOIN agent_pers ON agent_users.sv_aid = agent_pers.sv_p_uid) LEFT JOIN agent_stat ON agent_pers.sv_p_uid = agent_stat.sv_s_uid) LEFT JOIN agent_pro ON agent_pers.sv_p_pid=agent_pro.p_id WHERE MONTH(agent_pers.sv_p_datum) =7 GROUP BY sv_aname so the problem is now that i dont want sold items from previous months to get included in the data received, i know i could solve that by simple adding in the WHERE part MONTH(agent_stat.sv_s_datum) =7 but then if no items been sold that month no data at all will show up not the time or anything. Any aid on how i could solve this is greatly appreciated. if there's something that's not so clear dont hesitate to ask and ill try my best to answer. after all my english isn't the best out there :P regards breezer

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• Are there good reasons not to use an ORM?

  - by hangy

  During my apprenticeship, I have used NHibernate for some smaller projects which I mostly coded and designed on my own. Now, before starting some bigger project, the discussion arose how to design data access and whether or not to use an ORM layer. As I am still in my apprenticeship and still consider myself a beginner in enterprise programming, I did not really try to push in my opinion, which is that using an object relational mapper to the database can ease development quite a lot. The other coders in the development team are much more experienced than me, so I think I will just do what they say. :-) However, I do not completely understand two of the main reasons for not using NHibernate or a similar project: One can just build one’s own data access objects with SQL queries and copy those queries out of Microsoft SQL Server Management Studio. Debugging an ORM can be hard. So, of course I could just build my data access layer with a lot of SELECTs etc, but here I miss the advantage of automatic joins, lazy-loading proxy classes and a lower maintenance effort if a table gets a new column or a column gets renamed. (Updating numerous SELECT, INSERT and UPDATE queries vs. updating the mapping config and possibly refactoring the business classes and DTOs.) Also, using NHibernate you can run into unforeseen problems if you do not know the framework very well. That could be, for example, trusting the Table.hbm.xml where you set a string’s length to be automatically validated. However, I can also imagine similar bugs in a “simple” SqlConnection query based data access layer. Finally, are those arguments mentioned above really a good reason not to utilise an ORM for a non-trivial database based enterprise application? Are there probably other arguments they/I might have missed? (I should probably add that I think this is like the first “big” .NET/C# based application which will require teamwork. Good practices, which are seen as pretty normal on Stack Overflow, such as unit testing or continuous integration, are non-existing here up to now.)

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• WPF binding to a boolean on a control

  - by Jose

  I'm wondering if someone has a simple succinct solution to binding to a dependency property that needs to be the converse of the property. Here's an example I have a textbox that is disabled based on a property in the datacontext e.g.: <TextBox IsEnabled={Binding CanEdit} Text={Binding MyText}/> The requirement changes and I want to make it ReadOnly instead of disabled, so without changing my ViewModel I could do this: In the UserControl resources: <UserControl.Resources> <m:NotConverter x:Key="NotConverter"/> </UserControl.Resources> And then change the TextBox to: <TextBox IsReadOnly={Binding CanEdit,Converter={StaticResource NotConverter}} Text={Binding MyText}/> Which I personally think is EXTREMELY verbose I would love to be able to just do this(notice the !): <TextBox IsReadOnly={Binding !CanEdit} Text={Binding MyText}/> But alas, that is not an option that I know of. I can think of two options. Create an attached property IsNotReadOnly to FrameworkElement(?) and bind to that property If I change my ViewModel then I could add a property CanEdit and another CannotEdit which I would be kind of embarrassed of because I believe it adds an irrelevant property to a class, which I don't think is a good practice. The main reason for the question is that in my project the above isn't just for one control, so trying to keep my project as DRY as possible and readable I am throwing this out to anyone feeling my pain and has come up with a solution :)

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• Severe Tomcat crash has me stumped

  - by Eric Banderhide

  I'm pretty used to crashing my tomcat server. But I don't think I made any changes at all and seem to have broken it completely. Was working one min then not the next. I really hope someone can help here is the Catalina.out: Dec 20, 2012 1:35:56 AM org.apache.catalina.startup.Embedded initDirs SEVERE: Cannot find specified temporary folder at Dec 20, 2012 1:35:57 AM org.apache.catalina.core.AprLifecycleListener init INFO: Loaded APR based Apache Tomcat Native library 1.1.23. Dec 20, 2012 1:35:57 AM org.apache.catalina.core.AprLifecycleListener init INFO: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true]. Dec 20, 2012 1:35:57 AM org.apache.coyote.http11.Http11AprProtocol init INFO: Initializing Coyote HTTP/1.1 on http-8040 Dec 20, 2012 1:35:57 AM org.apache.coyote.ajp.AjpAprProtocol init INFO: Initializing Coyote AJP/1.3 on ajp-8042 Dec 20, 2012 1:35:57 AM org.apache.catalina.startup.Catalina load INFO: Initialization processed in 587 ms Dec 20, 2012 1:35:57 AM org.apache.catalina.core.StandardService start INFO: Starting service Catalina Dec 20, 2012 1:35:57 AM org.apache.catalina.core.StandardEngine start INFO: Starting Servlet Engine: Apache Tomcat/6.0.33 Dec 20, 2012 1:35:57 AM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory docs Dec 20, 2012 1:35:57 AM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory ROOT Dec 20, 2012 1:35:57 AM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory myApp Dec 20, 2012 1:35:57 AM org.apache.catalina.loader.WebappClassLoader validateJarFile INFO: validateJarFile(/lhome/me/tomcat6/webapps/myApp/WEB-INF/lib/javax.servlet.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class Dec 20, 2012 1:35:58 AM org.apache.coyote.http11.Http11AprProtocol start INFO: Starting Coyote HTTP/1.1 on http-8040 Dec 20, 2012 1:35:58 AM org.apache.coyote.ajp.AjpAprProtocol start INFO: Starting Coyote AJP/1.3 on ajp-8042 Dec 20, 2012 1:35:58 AM org.apache.catalina.startup.Catalina start INFO: Server startup in 880 ms Error Reading TLE line 1: java.lang.Exception: TLE line 1 not valid first line Error Creating SGP4 Satellite Dec 20, 2012 1:36:26 AM org.apache.coyote.http11.Http11AprProtocol pause INFO: Pausing Coyote HTTP/1.1 on http-8040 Dec 20, 2012 1:36:26 AM org.apache.coyote.ajp.AjpAprProtocol pause INFO: Pausing Coyote AJP/1.3 on ajp-8042 Dec 20, 2012 1:36:27 AM org.apache.catalina.core.StandardService stop INFO: Stopping service Catalina Dec 20, 2012 1:36:30 AM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc SEVERE: The web application [/myApp] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. Dec 20, 2012 1:36:30 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads SEVERE: The web application [/myApp] is still processing a request that has yet to finish. This is very likely to create a memory leak. You can control the time allowed for requests to finish by using the unloadDelay attribute of the standard Context implementation. Dec 20, 2012 1:36:30 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads SEVERE: The web application [/myApp] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak. Dec 20, 2012 1:36:30 AM org.apache.coyote.http11.Http11AprProtocol destroy INFO: Stopping Coyote HTTP/1.1 on http-8040 Dec 20, 2012 1:36:30 AM org.apache.coyote.ajp.AjpAprProtocol destroy INFO: Stopping Coyote AJP/1.3 on ajp-8042 Dec 20, 2012 1:37:12 AM org.apache.catalina.startup.Catalina stopServer SEVERE: Catalina.stop: java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391) at java.net.Socket.connect(Socket.java:579) at java.net.Socket.connect(Socket.java:528) at java.net.Socket.<init>(Socket.java:425) at java.net.Socket.<init>(Socket.java:208) at org.apache.catalina.startup.Catalina.stopServer(Catalina.java:422) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.catalina.startup.Bootstrap.stopServer(Bootstrap.java:338) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:416) And I have a new log that has been created, I've never seen it before but it seems to think its something severe. A long one but here it is: Massive Error Log I've never seen before

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• vs2008, opencv2.1,compile error in cxcore.hpp

  - by Long Gu

  Hi, gurus: I installed opencv2.1, made a new project (proj_A) using vs2008, used it for my computer vision tasks, it works fine. I copied an old project (proj_B, also made using vs2008) from other PC, compile it with ".h" and ".lib" files copied from opencv1.0 (which I did not install onto my PC), it compiles fine. I re-directed ".h" and ".lib" files in proj_B to opencv2.1 folders instead, compiled the proj_B, and then I got these errors from cxcore.hpp: class CV_EXPORTS RNG { public: enum { A=4164903690U, UNIFORM=0, NORMAL=1 }; // errors here, line 936 errors are: 5c:\opencv2.1\include\opencv\cxcore.hpp(936) : error C2143: syntax error : missing '}' before 'constant' 5c:\opencv2.1\include\opencv\cxcore.hpp(936) : error C2059: syntax error : 'constant' 5c:\opencv2.1\include\opencv\cxcore.hpp(936) : error C2143: syntax error : missing ';' before '}' 5c:\opencv2.1\include\opencv\cxcore.hpp(936) : error C2238: unexpected token(s) preceding ';' (400+ similar errors, but I believe the answer should be the same, so only list 1 set here) I compared setting for proj_A and proj_B, made them identical, and find no improvement. proj_A works well, proj_B refuse to compile. May I know what's wrong? Urgent, need to get it solved ASAP! Thanks a lot!

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