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• I am a beginner to C and this is the dumbest question..Confused about getchar() function

  - by happysoul

  Sorry if I am not supposed to post beginner level questions here..I am new to this site Please read the code below first I am confused about getchar() 's role in the following code.. I mean I know its helping me see the output window which will only be closed when I press enter key So getchar() is basically waiting for me to press enter and then reads a single character .. Now my question.. what is that single character this function is reading ?? I did not press any key from the keyboard for it to read Now when its not reading anything..why it does not give an error saying hey u didn't enter anything for me to read ..lol...(told u its a dumb question) #include <stdio.h> int main() { printf( "blah \n" ); getchar(); return 0; }

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• Blackberry Development, communicating two Blackberry device in a multiplayer game programatically

  - by Nikesh Yadav

  Hi Forum, We are developing a game application for Blackberry, which will have multi player option to let two or more player compete against each other. We have implemented the logic for that and already two or more player are able to play the game simultaneously on single device. Now we want to upgrade our application so that two or more user can compete each other playing from different device and different locations. Can anyone please help me by providing me the way (or code) to achieve this (communicating two blackberry devices over the air to access single session programmaticaly)? I found the code to connect two device using Bluetooth but as the player may situated in different geographic regions we need to achieve this using over the air connection. Thanks in advance. Thanks, Nikesh

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• Cross-platform embedded database/key-value store for C#

  - by Arne Claassen

  I'm looking for a fast, embeddable key/value store with cursor semantics over key collections (or a simple embeddable DB) that I can use in .NET and mono. Need it to be open-source, would prefer an MIT or Apache style license over a GPL license. Not opposed to a library that needs bindings to be written, as long as binaries are available for both windows and linux. Options considered: SQLite - has bindings and native implementation, but single-threaded and not all that fast Embedded InnoDB - no .NET bindings i can find and it's GPLv2 Berkley DB - no .NET bindings i can find Tokyo Cabinet - no .NET bindings i can find and problematic to build on windows MadCow Memory-mapped data structures - GPLv2 Is there an option better than the above that i'm missing, or bindings for the above i don't know about?

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• How to handle Booleans/CheckBoxes in ASP.NET MVC 2 with DataAnnotations?

  - by asp_net

  I've got a view model like this: public class SignUpViewModel { [Required(ErrorMessage = "Bitte lesen und akzeptieren Sie die AGB.")] [DisplayName("Ich habe die AGB gelesen und akzeptiere diese.")] public bool AgreesWithTerms { get; set; } } The view markup code: <%= Html.CheckBoxFor(m => m.AgreesWithTerms) %> <%= Html.LabelFor(m => m.AgreesWithTerms)%> The result: No validation is executed. That's okay so far because bool is a value type and never null. But even if I make AgreesWithTerms nullable it won't work because the compiler shouts "Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions." So, what's the correct way to handle this?

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• What is the best resizable circular byte buffer available in Java?

  - by Wouter Lievens

  I need a byte buffer class in Java for single-threaded use. I should be able to insert data at the back of the buffer and read data at the front, with an amortized cost of O(1). The buffer should resize when it's full, rather than throw an exception or something. I could write one myself, but I'd be very surprised if this didn't exist yet in a standard Java package, and if it doesn't, I'd expect it to exist in some well-tested public library. What would you recommend?

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• Hadoop WordCount example stuck at map 100% reduce 0%

  - by Abhinav Sharma

  [hadoop-1.0.2] ? hadoop jar hadoop-examples-1.0.2.jar wordcount /user/abhinav/input /user/abhinav/output Warning: $HADOOP_HOME is deprecated. ****hdfs://localhost:54310/user/abhinav/input 12/04/15 15:52:31 INFO input.FileInputFormat: Total input paths to process : 1 12/04/15 15:52:31 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 12/04/15 15:52:31 WARN snappy.LoadSnappy: Snappy native library not loaded 12/04/15 15:52:31 INFO mapred.JobClient: Running job: job_201204151241_0010 12/04/15 15:52:32 INFO mapred.JobClient: map 0% reduce 0% 12/04/15 15:52:46 INFO mapred.JobClient: map 100% reduce 0% I've set up hadoop on a single node using this guide (http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/#run-the-mapreduce-job) and I'm trying to run a provided example but I'm getting stuck at map 100% reduce 0%. What could be causing this?

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• RCov started analyzing loaded libs (including Rdoc itself) – when using rvm (Ruby Version Manager)

  - by phvalues

  Context rcov 0.9.8 2010-02-28 ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin10.3.0] rvm 0.1.38 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/] System Ruby (rvm use system): ruby 1.8.7 (2010-01-10 patchlevel 249) [i686-darwin10] Files The test setup is a 'lib' folder containing a single file which defines a class, the folders 'test' and 'test/sub_test', with 'sub_test' containing the single 'test_example_lib.rb' and a Rakefile like this: require 'rcov/rcovtask' task :default = [:rcov] desc "RCov" Rcov::RcovTask.new do | t | t.test_files = FileList[ 'test/**/test_*.rb' ] end Result #rake (in /Users/stephan/tmp/rcov_example) rm -r coverage Loaded suite /Users/stephan/.rvm/gems/ruby-1.8.7-p174/bin/rcov Started . Finished in 0.000508 seconds. 1 tests, 2 assertions, 0 failures, 0 errors +----------------------------------------------------+-------+-------+--------+ | File | Lines | LOC | COV | +----------------------------------------------------+-------+-------+--------+ |...ms/rcov-0.9.8/lib/rcov/code_coverage_analyzer.rb | 271 | 156 | 5.1% | |...ems/rcov-0.9.8/lib/rcov/differential_analyzer.rb | 116 | 82 | 9.8% | |lib/example_lib.rb | 16 | 11 | 72.7% | +----------------------------------------------------+-------+-------+--------+ |Total | 403 | 249 | 9.6% | +----------------------------------------------------+-------+-------+--------+ 9.6% 3 file(s) 403 Lines 249 LOC Question Why is RCov itself analysed here? I'd expect that (and it doesn't happen when using 'rvm use system'). In fact it seems to be due to me using a Ruby installed via rvm.

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• Lots of questions about file I/O (reading/writing message strings)

  - by Nazgulled

  Hi, For this university project I'm doing (for which I've made a couple of posts in the past), which is some sort of social network, it's required the ability for the users to exchange messages. At first, I designed my data structures to hold ALL messages in a linked list, limiting the message size to 256 chars. However, I think my instructors will prefer if I save the messages on disk and read them only when I need them. Of course, they won't say what they prefer, I need to make a choice and justify the best I can why I went that route. One thing to keep in mind is that I only need to save the latest 20 messages from each user, no more. Right now I have an Hash Table that will act as inbox, this will be inside the user profile. This Hash Table will be indexed by name (the user that sent the message). The value for each element will be a data structure holding an array of size_t with 20 elements (20 messages like I said above). The idea is to keep track of the disk file offsets and bytes written. Then, when I need to read a message, I just need to use fseek() and read the necessary bytes. I think this could work nicely... I could use just one single file to hold all messages from all users in the network. I'm saying one single file because a colleague asked an instructor about saving the messages from each user independently which he replied that it might not be the best approach cause the file system has it's limits. That's why I'm thinking of going the single file route. However, this presents a problem... Since I only need to save the latest 20 messages, I need to discard the older ones when I reach this limit. I have no idea how to do this... All I know is about fread() and fwrite() to read/write bytes from/to files. How can I go to a file offset and say "hey, delete the following X bytes"? Even if I could do that, there's another problem... All offsets below that one will be completely different and I would have to process all users mailboxes to fix the problem. Which would be a pain... So, any suggestions to solve my problems? What do you suggest?

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• Log4j Grouping application logs

  - by mhanda

  Hi, I am trying to group logs of multiple related applications to a single log file. For example I have 3 applications A1.esb, A2.esb, A3.esb. I want all the logs from these 3 applications get logged to a single log file called A.log. Similarly, I want B.log for B1.esb, B2.esb and B3.esb. I am using log4j in JBoss application server. I have tried to use TCLFilter but I only succeeded in getting individual applications logging to individual log files. As in, A1.esb logging to A1.log, A2.esb logging to A2.log and so on. But I couldn't figure out a way of grouping these loggings.

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• CakePHP with AJAX loaded pages

  - by Jacques Wolfghang

  Hi there. I am trying to create a website in which all interaction takes place on a single page which has its main content filled via AJAX. The site is effectively a template with a central interaction area. Users can click links which results in an AJAX request to fetch a new page to display in the interaction area. In this way, the page never refreshes, instead it has its content fetched and displayed via AJAX. I have found that the CakePHP framework has many useful features that could work with this project, however, I do not no if the Cake's MVC architecture would work with my single page architecture. So, what I really want to know is if I can use CakePHP features and functions on a website of this type, and also if anyone could give me any helpful tips on how I would go about implementing it. I am sorry if this is rambling or vague, english is not my mother tongue so I have trouble expressing what I have to say clearly. Thank you for your time.

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• set the color of a vertex using a GLSL vertex shader

  - by Soubok

  Is it possible to set the color of a single vertex (not a face) using a GLSL vertex shader program (using GL_ARB_shading_language_100 extension) ?

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• libcurl .NET does not want to work on Win64

  - by Dmitry

  I wrote multi-threaded FTP uploader on C#.NET using libcurl.NET. Everything works fine on my machine, but when I give application (exe + libcurl.dll + 2 libcurl C# binding DLLs) to my friend who is running Win64, application crashes. After adding exception catcher to whole Main() function, I was able to get readable error message: "An attempt was made to load a program with an incorrect format (Exception from HRESULT = 0x8007000b)" After googling for a while, I found an advice to enable unmanaged code in my project settings. I've recompiled my application and LibCurlNet.dll with this flag set but it did not help. What can cause such problem?

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• Bash alias to open Vim at last edit mark

  - by Pierre LaFayette

  The mark " in Vim takes you to your last edit position. I want to create an alias that will open my Vim instance and jump to that mark; something which is obviously extremely useful. This works from the command line: $ vim -c "'\"" File.cpp Now I want to make an alias for this: $ alias v='vim -c "'\"" File.cpp' Well that's not going to work! You need to escape the first single quote you say... $ alias v='vim -c "\'\"" File.cpp' Hmm. That didn't work either... So I try a whole lot of variations of single quoted and double quoted madness, bang my head against the table and load up stackoverflow in my browser, and here we are. How do I properly escape this alias?

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• How to set target hosts in Fabric file

  - by ssc

  I want to use Fabric to deploy my web app code to development, staging and production servers. My fabfile: def deploy_2_dev(): deploy('dev') def deploy_2_staging(): deploy('staging') def deploy_2_prod(): deploy('prod') def deploy(server): print 'env.hosts:', env.hosts env.hosts = [server] print 'env.hosts:', env.hosts Sample output: host:folder user$ fab deploy_2_dev env.hosts: [] env.hosts: ['dev'] No hosts found. Please specify (single) host string for connection: When I create a set_hosts() task as shown in the Fabric docs, env.hosts is set properly. However, this is not a viable option, neither is a decorator. Passing hosts on the command line would ultimately result in some kind of shell script that calls the fabfile, I would prefer having one single tool do the job properly. It says in the Fabric docs that 'env.hosts is simply a Python list object'. From my observations, this is simply not true. Can anyone explain what is going on here ? How can I set the host to deploy to ?

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• On MacOSX, in a C++ program, what guarantees can I have on file IO

  - by anon

  I am on MacOSX. I am writing a multi threaded program. One thread does logging. The non-logging threads may crash at any time. What conventions should I adopt in the logger / what guarantees can I have? I would prefer a solution where even if I crash during part of a write, previous writes still go to disk, and when reading back the log, I can figure out "ah, I wrote 100 complete enties, then I crashed on the 101th". Thanks!

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• Elisp performance on Windows and Linux

  - by JasonFruit

  I have the following dead simple elisp functions; the first removes the fill breaks from the current paragraph, and the second loops through the current document applying the first to each paragraph in turn, in effect removing all single line-breaks from the document. It runs fast on my low-spec Puppy Linux box using emacs 22.3 (10 seconds for 600 pages of Thomas Aquinas), but when I go to a powerful Windows XP machine with emacs 21.3, it takes almost an hour to do the same document. What can I do to make it run as well on the Windows machine with emacs 21.3? (defun remove-line-breaks () "Remove line endings in a paragraph." (interactive) (let ((fill-column 90002000)) (fill-paragraph nil))) : (defun remove-all-line-breaks () "Remove all single line-breaks in a document" (interactive) (while (not (= (point) (buffer-end 1))) (remove-line-breaks) (next-line 1))) Forgive my poor elisp; I'm having great fun learning Lisp and starting to use the power of emacs, but I'm new to it yet.

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• Adobe AIR: touch screen doesn't trigger mouse down event correctly

  - by Saariko

  i have designed a gaming kiosk app in as3 i am using it on a Sony vaio l pc (like hp's touchsmarts) in windows 7 the app doesn't need any multi-touch gestures (only single touch clicks and drags) so i am using mouse events everything is fine (including mouse click and move events) except that a single touch to the screen (with no move) doesn't fire a mouse down. it is fired only after a small move of the finger outside the app, on my desktop, i see that the small windows 7 cursor jumps immediately to where a finger is placed, meaning this issue isn't a hardware or a windows problem but rather how internally the flash app receives "translated" touch-to-mouse events from the os. for example, in a windows Solitaire game, a simple touch to the screen immediately highlights the touched card. in my app, a button will change to the down state only if i touch it and also move my finger slightly (click events - down and up - are triggered fine) shouldn't the MOUSE_DOWN event trigger exactly like how a TOUCH_BEGIN would in the new touchevent class? any ideas?

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• Saving Multiple Annotations -NSUserDefaults

  - by casillas

  I came cross this code as shown below.In the following code, I could able to save only one single annotation, however I have an array of annotations, I could not able to save them with single NSUserDefaults To save: NSUserDefaults *ud = [NSUserDefaults standardUserDefaults]; [ud setDouble:location.latitude forKey:@"savedCoordinate-latitude"]; [ud setDouble:location.longitude forKey:@"savedCoordinate-longitude"]; [ud setBool:YES forKey:@"savedCoordinate-exists"]; [ud synchronize]; Edited: -(void)viewDidLoad NSUserDefaults *ud=[NSUserDefaults standardUserDefaults]; if([ud boolForKey:@"save-exist"]) { NSMutableArray *udAnnotations=[[NSMutableArray alloc]initWithArray: [ud objectForKey:@"annotationsArray"]]; NSLog(@"%d",[udAnnotations count]); } else{ [self addAnno]; } -(void)addAnno { [mapView addAnnotations:annotationArray]; NSUserDefaults *ud=[NSUserDefaults standardUserDefaults]; [ud setObject:annotationArray forKey:@"annotationsArray"]; [ud setBool:YES forKey:@"save-exist"]; [ud synchronize]; }

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• Bash alias to open Vim at last cursor position mark

  - by Pierre LaFayette

  The mark " in Vim takes you to your last cursor position. I want to create an alias that will open my Vim instance and jump to that mark; something which is obviously extremely useful. This works from the command line: $ vim -c "'\"" File.cpp Now I want to make an alias for this: $ alias v='vim -c "'\""' Well that's not going to work! You need to escape the first single quote you say... $ alias v='vim -c "\'\""' Hmm. That didn't work either... So I try a whole lot of variations of single quoted and double quoted madness, bang my head against the table and load up stackoverflow in my browser, and here we are. How do I properly escape this alias?

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• LINQ Expression not evaluating correctly

  - by WedTM

  I have the following LINQ expression that's not returning the appropriate response var query = from quote in db.Quotes where quote.QuoteStatus == "Estimating" || quote.QuoteStatus == "Rejected" from emp in db.Employees where emp.EmployeeID == quote.EmployeeID orderby quote.QuoteID descending select new { quote.QuoteID, quote.DateDue, Company = quote.Company.CompanyName, Attachments = quote.Attachments.Count, Employee = emp.FullName, Estimator = (quote.EstimatorID != null && quote.EstimatorID != String.Empty) ? db.Employees.Single (c => c.EmployeeID == quote.EstimatorID).FullName : "Unassigned", Status = quote.QuoteStatus, Priority = quote.Priority }; The problem lies in the Estimator = (quote.EstimatorID != null && quote.EstimatorID != String.Empty) ? db.Employees.Single(c => c.EmployeeID == quote.EstimatorID).FullName : "Unassigned" part. I NEVER get it to evalueate to "Unassigned", on the ones that are supposed to, it just returns null. Have I written this wrong?

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• Boost C++ Singleton error LNK2001: unresolved external symbol "private: static long Nsp::HL::flag" (

  - by Soós Roland

  I try to create a multi-threaded singleton pattern class. Header: class HL{ public: static HL* getInstance(); ......... private: static HL* instance; static boost::once_flag flag; HL(); static void initOnce(); } CPP: HL* HL::instance = NULL; HL* HL::getInstance(){ if(instance == NULL){ boost::call_once(flag, initOnce); } return instance; } void HL::initOnce(){ instance = new HL(); } I get this error: error LNK2001: unresolved external symbol "private: static long Nsp::HL::flag" (?flag@HL@Nsp@@0JA) What's wrong?

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• First Tap on customcell of uitableview should expand it and second should contract it.

  - by neha

  Hi all, In my application I have this requirement that first tap on custom cell of uitableview with a label in it should expand it and second should contract it. I'm able to expand and contract cell and expand label inside cell, but not able to contract the label on second tap. I'm using this function - (void)setSelected:(BOOL)selected animated:(BOOL)animated { [super setSelected:selected animated:animated]; if( selected == YES ) { [self expandRow]; } else { [self contractRow]; } height = [lblFeed frame].size.height + 75; } expandRow expands the label and contractRow contracts it. I'm perplexed as for how many rows this function gets called. It doesn't get called only for the cell tapped, it gets called more number of times for single tap on single cell may be for other cells but I'm not getting which rows. This' really urgent. Can anybody please help?

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• linux pthread_suspend

  - by johnnycrash

  Looks like linux doesnt implement pthread_suspend and continue, but I really need em. I have tried cond_wait, but it is too slow. The work being threaded mostly executes in 50us but occasionally executes upwards of 500ms. The problem with cond_wait is two-fold. The mutex locking is taking comparable times to the micro second executions and I don't need locking. Second, I have many worker threads and I don't really want to make N condition variables when they need to be woken up. I know exactly which thread is waiting for which work and could just pthread_continue that thread. A thread knows when there is no more work and can easily pthread_suspend itself. This would use no locking, avoid the stampede, and be faster. Problem is....no pthread_suspend or _continue. Any ideas?

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• How to store data which contents the quotes in mysql

  - by Nitz

  Hey Guys, i have one problem. In one of my form i have use rich text editor from the yahoo. now i want to store the data from that text area to mysql database. bcz user can enter anything in that textarea. as example user can enter many double quotes, or single quotes. so i need to store that data which may content many double quotes or many single quotes, so how to do that? normally we store by adding that data in one variable and then put that in sql then fire. but now variable contents many quotes and now i have problem to store. i can't remove that quotes bcz of my style which is generated by rich text editor. So how can store that data without affecting my styles of data.

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• Tivoli Tam install

  - by yava

  I want to "Access Manager for Enterprise Single Sign-On" but I don't have the product CD. Where can I download it?

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