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• Sockets: I/O Error 32

  - by Genesis

  Could someone please explain what an I/O Error 32 refers to in the context of a network socket? I have a multithreaded Socks5 server written using Poco SocketReactors and am getting this error when the server load reaches a certain point. The exception is thrown within my onReadable handlers at the same time across all threads which have connections associated with them. The only other thing I am doing within those threads is std::cout but I am not sure if this is a potential cause.

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• What is the use of . (dot) and -> operators in c. Are they both same or differ from each other.

  - by Idlecool

  i have a confusion while using "." and "-" operators in c while working with structures. Can anyone please explain me how do both these operators differ or they both are same. Is there somewhere else these operators can be used apart from structures?

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• UIButton as a subview in UILabel

  - by Jayshree

  hi. i am trying to dynamically add a UIbutton as a subview to UIlable. but i am not able to click the button. it seems that the lable doesnt allow the buttonTapped event to occur. can somebody explain what exactly is happening here. and can anybody give me an alternative for this. thnx

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• Is it possible to classify OneNote pages in EverNote style tags?

  - by Ravisankar S

  The tags as used in OneNote is very different from EverNote. EverNote uses tags as gmail uses labels to classify emails. Is it possible to classify OneNote pages using tags / labels on the go? If so, would you please explain how to do it?

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• problems with 'free' in C

  - by lego69

  hello, can somebody please explain can I free const char* ? I allocated new memory using malloc and when I'm trying to free it I always receive an error incompatible pointer type thanks in advance something like this char* name="Arnold"; const char* str=malloc(stlen(name)+1); free(str); <- here bug

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• difference between scope and namespace of ruby-on-rails 3 routing

  - by fayer

  i cant understand what the difference is between a namespace and a scope in the routing of ruby-on-rails 3. could someone please explain? namespace "admin" do resources :posts, :comments end scope :module => "admin" do resources :posts, :comments end thanks

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• What does this pointer-heavy C code do?

  - by justRadojko

  Could someone explain to me what should two following lines do: s.httpheaderline[s.httpheaderlineptr] = *(char *)uip_appdata; ++((char *)uip_appdata); This is taken from uIP code for microcontrollers. s - structure httpheaderline - http packet presented as a string httpheadrlineptr - integer value uip_appdata - received ethernet packet (string) If some more info is needed please let me know. BTW. Eclipse is reporting an error on the second line with message Invalid lvalue in increment so i'm trying to figure out how to solve this.

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• XmlDataProvider Source="pack://application:,,,/FinanceExplorer/Equity.xml"

  - by Graeme

  Can someone explain the syntax in the source attribute here? What the heck is "pack:" and "application:" and why 3 commas? I couldn't find any decent desciptions.

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• Problem with setProgressDrawable

  - by Martin

  I am having problem with setting a new Drawable to my ProgressBar. If I use the setProgressDrawable() inside onCreate() method it works great. But when I try to call the same method inside a Handler post callback it doesn't work and the progressbar disapears. Can someone explain this behaviour? How can I solve this problem?

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• How does the Built-in Bindings of Google Guice work?

  - by lony

  Hello, I tried Google Guice the first time and find it very nice. But, when I reached the part of Built-in Bindings I do not understand the examples. For me it looks like I can use it for logging like an interceptor, but I don't know how. Could someone of you explain this type of Binding and how I can use it? And maybe (if it's possible) use it for logging?

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• What is a good metaphor for c memory management?

  - by fsmc

  I'm trying to find a good metaphor to explain memory allocation, initialization and freeing in c to a non technical audience. I've heard pass-by-reference/value talked about quite well with postal service usage, but not so much for allocation/deallocation. So for I've thought about using the idea of renting a space might work, but I wonder if the SO crew can provide something better.

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• Why can VS not display my WPF application in the designer, but it can run it just fine?

  - by Adam S

  This is absolutely ridiculous! Visual Studio is able to run (debug) my program just fine, but it won't display my layout in the designer. It just gives this useless error: Can anyone help explain this? I have not changed the XAML at all, not a single character, since the last time it worked fine. I've only changed some .cs code.

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• android bluetooth

  - by yoavstr

  can someone explain to me the concept behind using bluetooth my project in my studies is to make an android app using bluetooth, SQLLIGHT and google app the app itself is a very easy one but i just dont get the tools i need to use : how does the bluetooth works? is there a simple example ? the concept behind android GUI (i allready nade one but i think i am not fully understood his power)? note : i am using v 2.1

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• How to balance load in a Apache + Mongrel application

  - by Will

  I was wondering if someone can explain how can a rails application be balanced. Two questions: Does it even help having separate rails applications reading from the same database in the same dedicated server? I understand Apache can balance load installing some extra modules? am i right? how can we accomplish this? (please provide explanation for dummies)

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• Differentiate between TCHAR and _TCHAR

  - by Vulcan Eager

  What are the various differences between the two symbols TCHAR and _TCHAR type defined in the Windows header tchar.h? Explain with examples. Briefly describe scenarios where you would use TCHAR as opposed to _TCHAR in your code. (10 marks)

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• grep options (unix)

  - by lego69

  hello everyone, can You explain please, can grep pick rows if at least one element from the list appeared, for exmaple grep "hello world" file1 grep must give me all rows which have or word hello or world or both of them, thanks in advance

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• understanding of FPS and the methods they use

  - by numerical25

  Just looking on resources that break down how frames per second work. I know it has something to do with keeping track of Ticks and figure out how many ticks occured between each frame. But I never ran into any resources on why exactly you have to use the methods you use in order to get a smooth frame work. I am trying to get a thourough understanding of this. Can any explain or provide any good resources ? Thanks

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• is it better to retrive data using web service or directly from database in .net

  - by girish

  i was wondoring which thing is better from below two... first one- retrive data by creating webservice second one- create database connection from code behind call storeprocedure and retive data can anyone one explain how it differs.

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• Hibernate reverse engineering

  - by EugeneP

  I have a structure where the main table is USER, other tables include CATEGORY (contains user_id). What I got after the standard reverse engineering procedure was: the class User contained a collection of categories, the class Category didn't contain the foreign key (user_id) but it did contain the User object. Why did it not contain the foreign key as a class property? And how do I join these two tables in HQL without that glue? HQL - please explain this part.

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• Ruby hash value truthiness and symbols

  - by John Topley

  Could somebody please explain why the variable named foo remains true in the code below, even though it's set to false when the method is called? And why the symbol version behaves as expected? def test(options = {}) foo = options[:foo] || true bar = options[:bar] || :true puts "foo is #{foo}, bar is #{bar}" end >> test(:foo => false, :bar => :false) foo is true, bar is false I've only tried this using Ruby 1.8.7.

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• GC generation 3 appearing in windbg

  - by Johnv2020

  I've a dump file of a process I'm running (trying to find a memory leak) One thing I've noticed is that when I dump the bigger objects via !do windbg tells me that they are GC generation 3 ?? All of these are byte arrays so when I look at all the byte arrays in the dump I can see GC generations 0, 1, 2 & 3. Could someone explain whats going on here as I thought there was only 3 generations of GC.

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• Why callbacks for the after_find and after_initialize events is to define them as methods?

  - by piemesons

  The only way to define callbacks for the after_find and after_initialize events is to define them as methods. If you try declaring them as handlers using the second technique, they’ll be silently ignored. Can anybody explain why is it so? Why specifically for these two callbacks?

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• ASP.NET C# Sending Information Back to Client While Processing Web Page

  - by user204588

  Hi, Not sure if I'll explain this properly but here goes. I having written an asp.net app using C# for the code behind. After the user makes some selection and hits the "run" button I pass off the processing to a dll written in C# but what I want is a way to periodically send information back to the client so they can see what's going on like how many records have been processed and things like that. How can I accomplish this? thanks

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• Why 10675199.02:48:05.4775807 TimeSpan Maximum for CompilationSection?

  - by Alex

  I was looking at the metadata for System.Web.Configuration.CompilationSection, and noticed the following attribute on the TimeSpan BatchTimeout property: [TimeSpanValidator(MinValueString = "00:00:00", MaxValueString = "10675199.02:48:05.4775807")] Could someone explain why this is the allowed max value? TimeSpan itself has an upper limit, so why would there be another value validation, and why this number?

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• Is it possible that one of the mysql queries would interrupt?

  - by Donator

  I really didn't know how to call the topic, but I will try to explain it here. So, for example, I have 6 queries in one page. Is it possible, that first five of them would be completed and the last one wouldn't be? Is there any possibilities? If there is, what should I do? Hope you understood smth. Thanks.

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