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• Threading best practice when using SFTP in C#

  - by Christian

  Ok, this is more one of these "conceptual questions", but I hope I got some pointers in the right direction. First the desired scenario: I want to query an SFTP server for directory and file lists I want to upload or download files simulaneously Both things are pretty easy using a SFTP class provided by Tamir.SharpSsh, but if I only use one thread, it is kind of slow. Especially the recursion into subdirs gets very "UI blocking", because we are talking about 10.000 of directories. My basic approach is simple, create some kind of "pool" where I keep 10 open SFTP connections. Then query the first worker for a list of dirs. If this list was obtained, send the next free workers (e.g. 1-10, first one is also free again) to get the subdirectory details. As soon as there is a worker free, send him for the subsubdirs. And so on... I know the ThreadPool, simple Threads and did some Tests. What confuses me a little bit is the following: I basically need... A list of threads I create, say 10 Connect all threads to the server If a connection drops, create a new thread / sftp client If there is work to do, take the first free thread and handle the work I am currently not sure about the implementation details, especially the "work to do" and the "maintain list of threads" parts. Is it a good idea to: Enclose the work in an object, containing a job description (path) and a callback Send the threads into an infinite loop with 100ms wait to wait for work If SFTP is dead, either revive it, or kill the whole thread and create a new one How to encapsulate this, do I write my own "10ThreadsManager" or are there some out Ok, so far... Btw, I could also use PRISM events and commands, but I think the problem is unrelated. Perhaps the EventModel to signal a done processing of a "work package"... Thanks for any ideas, critic.. Chris

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• C++ design question on traversing binary trees

  - by user231536

  I have a binary tree T which I would like to copy to another tree. Suppose I have a visit method that gets evaluated at every node: struct visit { virtual void operator() (node* n)=0; }; and I have a visitor algorithm void visitor(node* t, visit& v) { //do a preorder traversal using stack or recursion if (!t) return; v(t); visitor(t->left, v); visitor(t->right, v); } I have 2 questions: I settled on using the functor based approach because I see that boost graph does this (vertex visitors). Also I tend to repeat the same code to traverse the tree and do different things at each node. Is this a good design to get rid of duplicated code? What other alternative designs are there? How do I use this to create a new binary tree from an existing one? I can keep a stack on the visit functor if I want, but it gets tied to the algorithm in visitor. How would I incorporate postorder traversals here ? Another functor class?

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• Static libpng link with visual studio 2010

  - by Sanctus2099

  Hey guys. I'm trying to add PNG support to my application and thus I want to include libpng. I know it needs zlib and thus I downloaded that as well. I went into the png folder/projects/vstudio and I opened the solution. I compiled it and it went just fine. I added some headers from it into my application and I copied the lib files. My program is a dll written in c++ which is later used from C#. When I run it in C# it complains about not finding my dll (tough if I remove the png part it works fine). I've had this problem before and it usually means a dll dependency is wrong. Now... libpng compiled both some .lib files and some .dll files. The dll files are bigger. My only guess is that it needs the dll files as well but I've seen that people can link to libpng without a dll. So my questions is: How can I compile libpng(and zlib for that instance) into just static libraries and how can I include those in my projects? I've searched around the internet and I couldn't find anything useful.

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• Can someone please explain this lazy evaluation code?

  - by Tejs

  So, this question was just asked on SO: http://stackoverflow.com/questions/2740001/how-to-handle-an-infinite-ienumerable My sample code: public static void Main(string[] args) { foreach (var item in Numbers().Take(10)) Console.WriteLine(item); Console.ReadKey(); } public static IEnumerable<int> Numbers() { int x = 0; while (true) yield return x++; } Can someone please explain why this is lazy evaluated? I've looked up this code in Reflector, and I'm more confused than when I began. Reflector outputs: public static IEnumerable<int> Numbers() { return new <Numbers>d__0(-2); } For the numbers method, and looks to have generated a new type for that expression: [DebuggerHidden] public <Numbers>d__0(int <>1__state) { this.<>1__state = <>1__state; this.<>l__initialThreadId = Thread.CurrentThread.ManagedThreadId; } This makes no sense to me. I would have assumed it was an infinite loop until I put that code together and executed it myself.

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• GNU Make: How to call $(wildcard) within $(eval)

  - by bengineerd

  I'm trying to create a generic build template for my Makefiles, kind of like they discuss in the eval documentation. I can't seem to get the wildcard function to work within an eval. The basic code I'm having issues with looks like this. SRC_DIR = ./src/ PROG_NAME = test define PROGRAM_template $(1)_SRC_DIR = $(join $(SRC_DIR), $(1)/) $(1)_SRC_FILES = $(wildcard $$($(1)_SRC_DIR)*.c) endef $(eval $(call PROGRAM_template, $(PROG_NAME))) all: @echo $(test_SRC_DIR) @echo $(test_SRC_FILES) @echo $(wildcard $(wildcard $(test_SRC_DIR)*.c) When I run make with this, the output is ./src/test [correct list of all .c files in ./src/test/] Basically, the wildcard call within PROGRAM_template is not being eval'd as I expect it. The call results in an empty list. The join call is being eval'd correctly though. So, what am I doing wrong? My guess is that $$($(1)_SRC_DIR) is not correct, but I can't figure out the right way to do it. EDIT Once this was solved, it didn't take long for me to hit another issue with eval. I posted it as a new question at http://stackoverflow.com/questions/2428506/workaround-for-gnu-make-3-80-eval-bug

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• json_encode with mysql content and umlauts in utf-8

  - by i3rutus

  Hey, i feel my beard growing while trying to find out the Problem here. Basic the Problem is, that Umlauts/Special Signs äöß ... don't work. I guess everyone is sick and tired of that questions but all the solutions found online don't seem to work. Im having utf-8 content in a utf-8 Mysql Database. I feel the Problem ist somewhere in the Database connection but i just can't figure out. character_set_client utf8 character_set_connection utf8 character_set_database utf8 character_set_filesystem binary character_set_results utf8 character_set_server latin1 character_set_system utf8 Im not sure if the problem is the latin1 for character_set_server because im not into that mysql stuff. I also dont know how to change cause i can't access the mysql server's config files. Whatever is confusing me, that if i get my results from the Database and echo it, print_r gives the right result. ini_set('default_charset','utf-8'); header('Content-Type: text/plain; > charset=utf-8'); Firefox says char encode is utf-8 but if when i output: print_r($listnew); echo json_encode($listnew[5]); print_r results everything right but json_encode does wrong. print_r: [5] => Array ( [id] => 5 [data] => U-Bahnhof Theresienstraße [size] => 17 ) json_encode: {"id":5,"data":"U-Bahnhof Theresienstra\u00dfe","size":17} i know json_encode needs a utf-8 string to work properly there and i feel im having a encode trouble here but i just can't firgure out where it is. Any help would be appreciated, thanks in advance. i3

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• Emacs recursive project search

  - by hekevintran

  I am switching to Emacs from TextMate. One feature of TextMate that I would really like to have in Emacs is the "Find in Project" search box that uses fuzzy matching. Emacs sort of has this with ido, but ido does not search recursively through child directories. It searches only within one directory. Is there a way to give ido a root directory and to search everything under it? Update: The questions below pertain to find-file-in-project.el from Michal Marczyk's answer. If anything in this message sounds obvious it's because I have used Emacs for less than one week. :-) As I understand it, project-local-variables lets me define things in a .emacs-project file that I keep in my project root. How do I point find-file-in-project to my project root? I am not familiar with regex syntax in Emacs Lisp. The default value for ffip-regexp is: ".*\\.\\(rb\\|js\\|css\\|yml\\|yaml\\|rhtml\\|erb\\|html\\|el\\)" I presume that I can just switch the extensions to the ones appropriate for my project. Could you explain the ffip-find-options? From the file: (defvar ffip-find-options "" "Extra options to pass to `find' when using find-file-in-project. Use this to exclude portions of your project: \"-not -regex \\".vendor.\\"\"") What does this mean exactly and how do I use it to exclude files/directories? Could you share an example .emacs-project file?

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• LINQ to SQL : Too much CPU Usage: What happens when there are multiple users.

  - by soldieraman

  I am using LINQ to SQL and seeing my CPU Usage sky rocketting. See below screenshot. I have three questions What can I do to reduce this CPU Usage. I have done profiling and basically removed everything. Will making every LINQ to SQL statement into a compiled query help? I also find that even with compiled queries simple statements like ByID() can take 3 milliseconds on a server with 3.25GB RAM 3.17GHz - this will just become slower on a less powerful computer. Or will the compiled query get faster the more it is used? The CPU Usage (on the local server goes to 12-15%) for a single user will this multiply with the number of users accessing the server - when the application is put on a live server. i.e. 2 users at a time will mean 15*2 = 30% CPU Usage. If this is the case is my application limited to maximum 4-5 users at a time then. Or doesnt LINQ to SQL .net share some CPU usage.

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• JSF ui:repeat and f:ajax giving wrong value for h:inputText after rerender.

  - by Andrew

  I have a list of questions and I can display them ok using a ui:repeat, but after clicking the Edit button the rerendered inputText is given the wrong question.id. For some reason, if you click Edit on the first item, the inputText value assigned is that of the second item in the list, even though other outputs (other than the h:inputText element) are correct. <h:form id="questionnaireForm"> <ui:repeat value="#{ProjectManager.currentProject.preQuestions}" var="question" varStatus="current" id="preQuestionsRepeat"> <div> <ui:fragment rendered="#{!question.editing}"> <f:ajax render="@form"> <p>#{question.id} #{question.questionText}</p> <h:inputText value="#{question.id}"/> <h:commandLink styleClass="link" action="#{question.setEditing}" value="Edit"> </h:commandLink> </f:ajax> </ui:fragment> </div> <div> <ui:fragment rendered="#{question.editing}"> <f:ajax render="@form"> <p>#{question.id} #{question.questionText}</p> <h:inputText value="#{question.id}"/> </f:ajax> </ui:fragment> </div> </ui:repeat> </h:form> Obviously I don't really want to edit the id. I just want the correct question.something to show up in my inputText :-) Perhaps I'm not using correctly? It seems fine according to my reading so far. Many thanks for your assistance.

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• Struggling with currency in Cocoa.

  - by Meltemi

  I'm trying to do something I'd think would be fairly simple: Let a user input a dollar amount, store that amount in an NSNumber (NSDecimalNumber?), then display that amount formatted as currency again at some later time. My trouble is not so much with the setNumberStyle:NSNumberFormatterCurrencyStyle and displaying floats as currency. The trouble is more with how said numberFormatter works with this UITextField. I can find few examples. This thread from November and this one give me some ideas but leaves me with more questions. I am using the UIKeyboardTypeNumberPad keyboard and understand that I should probably show $0.00 (or whatever local currency format is) in the field upon display then as a user enters numerals to shift the decimal place along: Begin with display $0.00 Tap 2 key: display $0.02 Tap 5 key: display $0.25 Tap 4 key: display $2.54 Tap 3 key: display $25.43 Then [numberFormatter numberFromString:textField.text] should give me a value I can store in my NSNumber variable. Sadly I'm still struggling: Is this really the best/easiest way? If so then maybe someone can help me with the implementation? I feel UITextField may need a delegate responding to every keypress but not sure what, where and how to implement it?! Any sample code? I'd greatly appreciate it! I've searched high and low... Edit1: So I'm looking into NSFormatter's stringForObjectValue: and the closest thing I can find to what benzado recommends: UITextViewTextDidChangeNotification. Having really tough time finding sample code on either of them...so let me know if you know where to look?

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• Java Swingworker: Not as encapsulated class

  - by Thomas Matthews

  I'm having problems passing information, updating progress and indicating "done" with a SwingWorker class that is not an encapsulated class. I have a simple class that processes files and directories on a hard drive. The user clicks on the Start button and that launches an instance of the SwingWorker. I would like to print the names of the files that are processed on the JTextArea in the Event Driven Thread from the SwingWorker as update a progress bar. All the examples on the web are for an nested class, and the nested class accesses variables in the outer class (such as the done method). I would also like to signal the Event Driven Thread that the SwingWorker is finished so the EDT can perform actions such as enabling the Start button (and clearing fields). Here are my questions: 1. How does the SwingWorker class put text into the JTextArea of the Event Driven Thread and update a progress bar? How does the EDT determine when the {external} SwingWorker thread is finished? {I don't want the SwingWorker as a nested class because there is a lot of code (and processing) done.}

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• iPhone: In landscape-only, after first addSubview, UITableViewController doesn't rotate properly

  - by Clay Bridges

  A minimal illustrative Xcode project for this is available on github. On my UIWindow, when I add second (and subsequent) UITableView's as subviews, they do not rotate properly, and thus appear sideways. This is only tested in the Simulator. Here's a little code for you: - (void)applicationDidFinishLaunching:(UIApplication *)application { ShellTVC* viewA = [[ShellTVC alloc] initWithTitle:@"View A"]; ShellTVC* viewB = [[ShellTVC alloc] initWithTitle:@"View B"]; // The first subview added will rotate to landscape correctly. // Any subsequent subview added will not. // You may try this by various commentings and rearranging of these two statements. [window addSubview:[viewA tableView]]; [window addSubview:[viewB tableView]]; [window makeKeyAndVisible]; } viewB appears sideways. Comment out the addSubview for viewB, and viewA appears correctly. Do that for viewA only, and viewB appears correctly. I am not creating these UITableViewControllers via NIBs, though the UIWindow is. In case you are wondering, ShellTVC is-a UITableViewController, and implements this method: - (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft); } Also, I have set the UIInterfaceOrientation in the plist file to UIInterfaceOrientationLandscapeLeft. Probably related -- and unanswered -- SO questions here and here.

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• Still about SSD potentials...write and read speed

  - by Macroideal

  HI Gurus, I have been working on SSD(solid state disk) for several months..Problems and Questions hit my head unexpectedly..Coz i am a virgin in ssd... Esp these days i was testing the write-read speed of ssd, which I was always caring.... however result turned out not good as I expected, or even worse Three kinds of read-write were implemented in my test 1. read and write directly from and into ssd, with openning ssd as a whole device. in windows: _open("\\:g", ***).. It can be very tricky and hairy that you'd write a data with size of folds of 512, at the disk position of folds of 512bytes... So, If you wanto write just a byte or 4 bytes, you'v to write at least a whole sector one time. 2. Read and write data from and into files located in SSD... 3. Read and Write data from and into files in mechanical Disk I compared the pratices below...I found ssd sucks...the ssd performs worse than mechanical disk... so i am wondering where i can get the potential performance of ssd, since ssd is said to a substitute for mechanical disk in the future.. Nevertheless, I test ssd with a pro-hard-disk tools..ssd is like twice speedier than mechanical disk. So, why? Thanx very much...If you know tips of ssd...follow me

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• Inheriting from ViewPage forces explicit casting of model in view

  - by Martin Hansen

  I try to inhering from ViewPage as shown in this question http://stackoverflow.com/questions/370500/inheriting-from-viewpage But I get a Compiler Error Message: CS1061: 'object' does not contain a definition for 'Spot' and no extension method 'Spot' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?) My viewpage, normally I can do Model.ChildProperty(Spot) when I inherit from ViewPage directly, so I do that here too. But it fails. <%@ Page Language="C#" Inherits="Company.Site.ViewPageBase<WebSite.Models.SpotEntity>" %> <h1><%= Html.Encode(Model.Spot.Title) %></h1> To get it working correctly I have to do like this: <%@ Page Language="C#" Inherits="Company.Site.ViewPageBase<WebSite.Models.SpotEntity>" %> <h1><%= Html.Encode(((WebSite.Models.SpotEntity)Model).Spot.Title) %></h1> Here is my classes: namespace Company.Site { public class ViewPageBase<TModel> : Company.Site.ViewPageBase where TModel:class { private ViewDataDictionary<TModel> _viewData; [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")] public new ViewDataDictionary<TModel> ViewData { get { if (_viewData == null) { SetViewData(new ViewDataDictionary<TModel>()); } return _viewData; } set { SetViewData(value); } } protected override void SetViewData(ViewDataDictionary viewData) { _viewData = new ViewDataDictionary<TModel>(viewData); base.SetViewData(_viewData); } } public class ViewPageBase : System.Web.Mvc.ViewPage { } } So how do I get it to work without the explicit cast?

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• Reading a POP3 server with only TcpClient and StreamWriter/StreamReader

  - by WebDevHobo

  I'm trying to read mails from my live.com account, via the POP3 protocol. I've found the the server is pop3.live.com and the port if 587. I'm not planning on using a pre-made library, I'm using NetworkStream and StreamReader/StreamWriter for the job. I need to figure this out. So, any of the answers given here: http://stackoverflow.com/questions/44383/reading-email-using-pop3-in-c are not usefull. It's part of a larger program, but I made a small test to see if it works. Eitherway, i'm not getting anything. Here's the code I'm using, which I think should be correct. public Program() { string temp = ""; using(TcpClient tc = new TcpClient(new IPEndPoint(IPAddress.Parse("127.0.0.1"),8000))) { tc.Connect("pop3.live.com",587); using(NetworkStream nws = tc.GetStream()) { using(StreamReader sr = new StreamReader(nws)) { using(StreamWriter sw = new StreamWriter(nws)) { sw.WriteLine("USER " + user); sw.Flush(); sw.WriteLine("PASS " + pass); sw.Flush(); sw.WriteLine("LIST"); sw.Flush(); while(temp != ".") { temp += sr.ReadLine(); } } } } } Console.WriteLine(temp); } So, I'm sending from port 8000 on my machine to port 587, the hotmail pop3 port. And I'm getting nothing, and I'm out of ideas.

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• factorygirl rails, says "top required" in my spec - don't know how to fix

  - by user924088

  I get the following error message when I run my tests. It says that the problem is in my lecture_spec, and that the top is required. I don't know if this has something to do with requiring my spec_helper.rb file. 1) Lecture has a valid factory Failure/Error: FactoryGirl.create(:lecture).should be_valid NoMethodError: undefined method `after_build=' for #<Lecture:0x007fe7747bce70> # ./spec/models/lecture_spec.rb:21:in `block (2 levels) in <top (required)>' My factory looks like the following: require 'faker' FactoryGirl.define do factory :question do association :lecture name { Faker::Lorem.words(1) } description {Faker::Lorem.words(7)} factory :question_one do answer 1 end factory :question_two do answer 2 end factory :question_three do answer 3 end end end And this is my lecture_spec file require 'spec_helper' describe Lecture do it "has a valid factory" do FactoryGirl.create(:lecture).should be_valid end end and this is my lecture factory, where I defined the lecture factory. FactoryGirl.define do factory :lecture do #association :question name {Faker::Lorem.words(1)} description {Faker::Lorem.words(7)} soundfile_file_name {Faker::Lorem.words(1)} soundfile_content_type {Faker::Lorem.words(3)} soundfile_file_size {Faker::Lorem.words(8)} after_build do |question| [:question_one, :question_two, :question_three].each do |question| association :questions, factory: :question, strategy: :build end end end end

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• iOS5: Confusion with loadview and init and instance variables

  - by user743550

  I'm new to iOS5 and storyboarding. I noticed that if I declare an instance variables inside my viewcontroller .h file and set the values inside my init of .m file of my viewcontroller, whe the view of the viewcontroller is displayed, my instance variables show null inside viewDidLoad. In order for me to get myvariables, I'd need to do [self init] inside viewDidLoad. My questions are: @interface tableViewController : UITableViewController { NSMutableArray *myvariable; } @end @implementation tableViewController -(id)init { myvariable = [[NSMutableArray alloc]initWithObjects:@"Hi2",@"Yo2",@"whatsup2", nil]; } - (void)viewDidLoad { NSLog(@"%@",myvariable); // DISPLAYS NULL [super viewDidLoad]; } Why isn't my variables available in viewdidLoad when I declared and implemented in my .h and .m files? If that's the case, is viewDidLoad or viewWillAppear the common places to load the data for the viewcontroller? It looks like even if you instantiate a viewcontroller, the init function gets called but the viewDidLoad doesn't necessarily have the variables to be displayed. Where's the right place/methods to load the model(data) for my viewcontroller? Thanks in advance

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• How does one convert 16-bit RGB565 to 24-bit RGB888?

  - by jleedev

  I’ve got my hands on a 16-bit rgb565 image (specifically, an Android framebuffer dump), and I would like to convert it to 24-bit rgb888 for viewing on a normal monitor. The question is, how does one convert a 5- or 6-bit channel to 8 bits? The obvious answer is to shift it. I started out by writing this: uint16_t buf; while (read(0, &buf, sizeof buf)) { unsigned char red = (buf & 0xf800) >> 11; unsigned char green = (buf & 0x07c0) >> 5; unsigned char blue = buf & 0x003f; putchar(red << 3); putchar(green << 2); putchar(blue << 3); } However, this doesn’t have one property I would like, which is for 0xffff to map to 0xffffff, instead of 0xf8fcf8. I need to expand the value in some way, but I’m not sure how that should work. The Android SDK comes with a tool called ddms (Dalvik Debug Monitor) that takes screen captures. As far as I can tell from reading the code, it implements the same logic; yet its screenshots are coming out different, and white is mapping to white. Here’s the raw framebuffer, the smart conversion by ddms, and the dumb conversion by the above algorithm. (By the way, this conversion is implemented in ffmpeg, but it’s just performing the dumb conversion listed above, leaving the LSBs at all zero.) I guess I have two questions: What’s the most sensible way to convert rgb565 to rgb888? How is DDMS converting its screenshots?

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• How can I use Convert.ChangeType to convert string into numerics with group separator?

  - by Loic

  Hello, I want to make a generic string to numeric converter, and provide it as a string extension, so I wrote the following code: public static bool TryParse<T>( this string text, out T result, IFormatProvider formatProvider ) where T : struct try { result = (T)Convert.ChangeType( text, typeof( T ), formatProvider ); return true; } catch(... I call it like this: int value; var ok = "123".TryParse(out value, NumberFormatInfo.CurrentInfo) It works fine until I want to use a group separator: As I live in France, where the thousand separator is a space and the decimal separator is a comma, the string "1 234 567,89" should be equals to 1234567.89 (in Invariant culture). But, the function crashes! When a try to perform a non generic conversion, like double.Parse(...), I can use an overload which accepts a NumberStyles parameter. I specify NumberStyles.Number and this time it works! So, the questions are : Why the parsing does not respect my NumberFormatInfo (where the NumberGroupSeparator is well specified to a space, as I specified in my OS) How could I make work the generic version with Convert.ChangeTime, as it has no overload wich accepts a NumberStyles parameter ?

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• File extensions and MIME Types in .NET

  - by Marc Climent

  I want to get a MIME Content-Type from a given extension (preferably without accessing the physical file). I have seen some questions about this and the methods described to perform this can be resumed in: Use registry information. Use urlmon.dll's FindMimeFromData. Use IIS information. Roll your own MIME mapping function. Based on this table, for example. I've been using no.1 for some time but I realized that the information provided by the registry is not consistent and depends on the software installed on the machine. Some extensions, like .zip don't use to have a Content-Type specified. Solution no.2 forces me to have the file on disk in order to read the first bytes, which is something slow but may get good results. The third method is based on Directory Services and all that stuff, which is something I don't like much because I have to add COM references and I'm not sure it's consistent between IIS6 and IIS7. Also, I don't know the performance of this method. Finally, I didn't want to use my own table but at the end seems the best option if I want a decent performance and consistency of the results between platforms (even Mono). Do you think there's a better option than using my own table or one of other described methods are better? What's your experience?

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• Web scraping etiquette

  - by Ash

  I'm considering writing a simple web scraping application to extract information from a website that does not seem to specifically prohibit this. I've checked for other alternatives (eg RSS, web service) to get this information, but there are none available at this stage. Despite this I've also developed/maintained a few websites myself and so I realize that if web scraping is done naively/greedily it can slow things down for other users and generally become a nuisance. So, what etiquette is involved in terms of: Number of requests per second/minute/hour. HTTP User Agent content. HTTP Referer content. HTTP Cache settings. Buffer size for larger files/resources. Legalities and licensing issues. Good tools or design approaches to use. Robots.txt, is this relevant for web scraping or just crawlers/spiders? Compression such as GZip in requests. Update Found this relevant question on Meta: Etiquette of Screen Scaping StackOverflow. Jeff Atwood's answer has some helpful recommendations. Other related StackOverflow questions: Options for html scraping Legalities of screen scraping

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• When am I ready for contracting work?

  - by Kirk Broadhurst

  What skills are required to work on a temp / contracting basis, and how does a developer know when they are ready to work in these circumstances? I have some colleagues who are suggesting contracting work is 'the way to go'; the pay is significantly better. It appears that when a permanent position pays (X times $10k) per year, the corresponding contract position pays almost $X per hour - which is close to twice as much. I look forward to doing this type of work as an experienced expert, but worry that by doing so right now I'd be turning away learning and development opportunities. My assumptions about contract work are the following: less / zero money invested on training and development less concern for job satisfaction and learning ("they won't be here in 12 months") possibly less concern about the overall quality of the project ("we won't be here in 12 months") There are similar questions on stack overflow at the moment but what I've really looking for is: What does the developer give up by moving to contract work? Is it preferable to have structured learning in a permanent position rather than seat-of-the-pants learning in a contract position? What skill leve should the contractor have before making the move? Is there still the same kind of growth in contracting that there is in permanent positions? Rightly or wrongly, I see this as a choice between $ (contracting) and learning / development (permanent). Is this fair?

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• WCF Service Layer in n-layered application: performance considerations

  - by Marconline

  Hi all. When I went to University, teachers used to say that in good structured application you have presentation layer, business layer and data layer. This is what I heard for more than 5 years. When I started working I discovered that this is true but sometimes is better to have more than just three layers. Two or three days ago I discovered this article by John Papa that explain how to use Entity Framework in layered application. According to that article you should have: UI Layer and Presentation Layer (Model View Pattern) Service Layer (WCF) Business Layer Data Access Layer Service Layer is, to me, one of the best ideas I've ever heard since I work. Your UI is then completely "diconnected" from Business and Data Layer. Now when I went deeper by looking into provided source code, I began to have some questions. Can you help me in answering them? Question #0: is this a good enterpise application template in your opinion? Question #1: where should I host the service layer? Should it be a Windows Service or what else? Question #2: in the source code provided the service layer expose just an endpoint with WSHttpBinding. This is the most interoperable binding but (I think) the worst in terms of performances (due to serialization and deserializations of objects). Do you agree? Question #3: if you agree with me at Question 2, which kind of binding would you use? Looking forward to hear from you. Have a nice weekend! Marco

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• What is the recommended coding style for PowerShell?

  - by stej

  Is there any recommended coding style how to write PowerShell scripts? It's not about how to structure the code (how many functions, if to use module, ...). It's about 'how to write the code so that it is readable'. In programming languages there are some recommended coding styles (what to indent, how to indent - spaces/tabs, where to make new line, where to put braces,...), but I haven't seen any suggestion for PowerShell. What I'm interested particularly in: How to write parameters function New-XYZItem ( [string] $ItemName , [scriptblock] $definition ) { ... (I see that it's more like 'V1' syntax) or function New-PSClass { param([string] $ClassName ,[scriptblock] $definition )... or (why to add empty attribute?) function New-PSClass { param([Parameter()][string] $ClassName ,[Parameter()][scriptblock] $definition )... or (other formatting I saw maybe in Jaykul's code) function New-PSClass { param( [Parameter()] [string] $ClassName , [Parameter()] [scriptblock] $definition )... or ..? How to write complex pipeline Get-SomeData -param1 abc -param2 xyz | % { $temp1 = $_ 1..100 | % { Process-somehow $temp1 $_ } } | % { Process-Again $_ } | Sort-Object -desc or (name of cmdlet on new line) Get-SomeData -param1 abc -param2 xyz | % { $temp1 = $_ 1..100 | % { Process-somehow $temp1 $_ } } | % { Process-Again $_ } | Sort-Object -desc | and what if there are -begin -process -end params? how to make it the most readable? Get-SomeData -param1 abc -param2 xyz | % -begin { init } -process { Process-somehow2 ... } -end { Process-somehow3 ... } | % -begin { } .... or Get-SomeData -param1 abc -param2 xyz | % ` -begin { init } ` -process { Process-somehow2 ... } ` -end { Process-somehow3 ... } | % -begin { } .... the indentitation is important here and what element is put on new line as well. I have covered only questions that come on my mind very frequently. There are some others, but I'd like to keep this SO question 'short'. Any other suggestions are welcome.

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• Is MEF an all-or-nothing affair?

  - by Dave

  I've had a few questions about MEF recently, but here's the big one -- is it really all-or-nothing, as it appears to be? My basic application structure is simply an app, several shared libraries that are intended to be singletons, and several different plugins (which may implement different interfaces). The app loads the plugins, and both the app and all plugins need to access the shared libraries. My first go at MEF was fairly successful, although I made some stupid mistakes along the way because I was trying so many different things, I just got confused at times. But in the end, last night I got my smallish test app running with MEF, some shared libraries, and one plugin. Now I'm moving onto the target app, which I already described. And it's the multiple plugins part that has be a bit worried. My existing application already supports multiple plugins with different interfaces by using Reflection. I need to be able to uniquely identify each plugin so that the user can select one and get the expected behavior exposed by that plugin. The problem is that I don't know how to do this yet... but that's the topic of a different question. Ideally, I'd be able to take my existing plugin loader and use it as-is, while relying on MEF to do the shared library resolution. The problem is, I can't seem to get MEF to load them (i.e. I get a CompositionException when calling ComposeParts()) unless I also use MEF to load the plugin. And if I do this, well... then I need to know how to keep track of them as they get loaded so the user can select one from a list of plugins. What have your experiences been with trying to mix and match these approaches?

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