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• Detecting/Repairing NSConnection failure

  - by anthony

  I would like to use NSConnection/NSDistributedObject for interprocess communication. I would like the client to be able to handle the case where the server is only occasionally reachable. How can I determine if sending a message to the NSConnection will fail or has failed? Currently if my server (the process that has vended the remote object) dies, the client will crash if it sends a selector to the remote object. Ideally I'd like to have a wrapper for the remote object that can lazily instantiate (or reinstantiate) the connection, and return a default value in the case where the connection could not be instantiated, or the connection has failed. I don't really know the correct way to do this using objective c. Here's some pseudocode representing this logic: if myConnection is null: instantiate myConnection if MyConnection is null: return defaultValue try return [myConnection someMethod] catch myConnection = null return defaultValue

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• erroneous Visual C float / double conversion?

  - by RED SOFT ADAIR

  In Visual C++ i wrote the following sample in a C++ program: float f1 = 42.48f; double d1 = 42.48; double d2 = f1; I compiled the program with Visual Studio 2005. In the debugger i see the following values: f1 42.480000 float d1 42.479999999999997 double d2 42.479999542236328 double d1 by my knowledege is OK, but d2 is wrong. The problem occurs as well with /fp=precise as with /fp=strict as with /fp=fast. Whats the problem here? Any hint how to avoid this Problem? This leads to serious numerical problems.

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• C++ - dynamic pointer of array

  - by Eagle

  Hi to all, first i would like to say i am Newbie in C++. As part of my master thesis i am writing a program in C++ which also get as parameters the variables m and d (both integers). Were d is the power of 2 (this means 2^d elements). Parameter m define the number of possible interactions between one element and the total group (2^d elements). The number of possible interactions is computed as following: \kappa = \sum_{i=0}^m\binom{d}{i} (at present i generate vector of vectors for 2^d x \kappa, but my Prof. would like me to create different statistics to different m's. My first though was to to generate a dynamic array of m arrays of different sizes... Then i though of defining a 3-dim array with the biggest needed 2d array, but also program speed is important (e.g d = 20). i would like to ask for your advice how to define such kind of dynamic array that will also be fast. Regards

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• asp.net login control with role redirection

  - by Eatdoku

  Hi, I am using a asp.net login control with one of my asp.net application to authenticate users. I also have roles defined as well. Some of the directories are setup so only users with ROLE "MANAGER" are able to access pages under those directories. If the user does not have "MANAGER" role, he will simply be redirect back to the login page. so my question is that for the out of box login control, is there a way to show the proper login fail error message? for user trying to login but does not have a proper ROLE assigned to them, instead of a generic error message saying "login failed" thanks.

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• Batch backup a harddrive without modifying access times C#

  - by johnathan-doena

  I'm trying to write a simple program that will backup my flash drive. I want it to work automatically and silently in the background, and I also want it to be as quick as possible. The thing is, resetting all the access times is useless to me, and something I want to avoid. I know I can read the access times and set them back, but I bet it will fail one day in the future. It would be much simpler to read the files without ever changing it. Also, what is the fastest way to do this? What differences would there be between, say, a flash drive and an external hard drive. I am writing this in C#, as it is the simplest way to do it and it will probably last more generations of Windows..

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• Programming and art

  - by user353874

  Specialized software does play a major role in every business field. Games provide new realities and are proved child development tools. Communication got a new meaning. Information never traveled so fast. And programming is never referred to as an art form. Why is that? Programming is not romantic and not natural so we don't feel naturally attached to it. Basically, our emotions don't fit programming. But it's really cool and better than art. :D

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• Exception of Binding form data to object

  - by Captain Kidd

  I'm practising Spring MVC.But fail to populate command object in Controller when I use spring standard tag. For example: "form:input path="password"" But I perfectly do this with HTML standard tag. Like: "input type="text" name="password"" I wonder the way how to use Spring tag binding data. In addition, I think configuration and coding is right in my sample. protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception { UserFormBean b = (UserFormBean)command; System.out.println("s"); return super.onSubmit(request, response, command, errors); } <form:form commandName="command" action="/SpringFrame/register.html"> <form:input path="password"/> <!-- <input type="text" name="password"/> --> <input type="submit"/> </form:form>

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• Encoding issue with form and HTML Purifier / MySQL

  - by Andrew Heath

  Driving me nuts... Page with form is encoded as Unicode (UTF-8) via: <meta http-equiv="content-type" content="text/html; charset=utf-8"> entry column in database is text utf8_unicode_ci copying text from a Word document with " in it, like this: “1922.” is insta-fail and ends up in the database as â??1922.â?? (typing new data into the form, including " works fine... it's cut and pasting from Word...) PHP steps behind the scenes are: grab value from POST run through HTML Purifier default settings run through mysql_real_escape_string insert query into dbase Help?

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• How to effectively draw on desktop in C#?

  - by Lazlo

  I want to draw directly on the desktop in C#. From searching a bit, I ended up using a Graphics object from the Desktop HDC (null). Then, I painted normally using this Graphics object. The problem is that my shapes get lost when any part of the screen is redrawn. I tried a While loop, but it actually ends up drawing as fast as the application can, which is not the update rate of the desktop. Normally, I would need to put my drawing code in a "OnPaint" event, but such thing does not exist for the desktop. How would I do it? Example code: http://stackoverflow.com/questions/1536141/how-to-draw-directly-on-the-windows-desktop-c

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• PHP APC - Why is loading cached array op codes slow?

  - by Aaron Kreider

  I'm using APC to reduce my loading time for my PHP files. My files load very fast, except for one file where I define more than 100 arrays. This 270 kb file takes 200 ms to load. The rest of the files are full of objects, methods, and functions. I'm wondering: does OP code caching not work as well for arrays? My APC cache should be big enough to handle all of my classes. Currently 40% of my cache is free. My hit rate is 99%. apc.shm_size=32 M apc.max_file_size = 1M apc.shm_segments= 1 APC 3.1.6 I'm using PHP 5.2, Apache 2, and Windows Vista.

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• MATLAB submatrix over variable dimensions

  - by rlbond

  I have a variable dimension matrix, X. I want a function that will get the first half of X in one dimension. I.E., I want something like this: function x = variableSubmatrix(x, d) if d == 1 switch ndims(x) case 1 x = x(1:end/2); case 2 x = x(1:end/2, :); case 3 x = x(1:end/2, :, :); (...) end elseif d == 2 switch ndims(x) case 2 x = x(:, 1:end/2); case 3 x = x(:, 1:end/2, :); (...) end elseif (...) end end I'm not quite sure how to do this. I need it to be fast, as this will be used many times in computation.

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• Testing with Unittest Python

  - by chrissygormley

  Hello, I am runninig test's with Python Unittest. I am running tests but I want to do negative testing and I would like to test if a function throw's an exception, it passes but if no exception is thrown the test fail's. The script I have is: try: result = self.client.service.GetStreamUri(self.stream, self.token) self.assertFalse except suds.WebFault, e: self.assertTrue else: self.assertTrue This alway's passes as True even when the function work's perfectly. I have also tried various other way's including: try: result = self.client.service.GetStreamUri(self.stream, self.token) self.assertFalse except suds.WebFault, e: self.assertTrue except Exception, e: self.assertTrue Does anyone have any suggestions? Thanks

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• Python IPC, popen too slow

  - by UnableToLoad

  i need to run a subprocess (./myProgram) form python script and get output, actually i do this: import subprocess proc = subprocess.Popen('./generate_out', shell=False, stdout=subprocess.PIPE, ) while proc.poll() is None: out = proc.stdout.readline() data = doStuff(out) print(data) but is slow, sometimes pass a lot of time between the output produced by ./generate_out and the print(data), knowing that my doStuff() function is very fast, i think there is some buffer slowing down my pipe... Notes: ./generate_out, generates potentially an unlimited number of lines of finite length each. It seems that when too few chars are put in the pipe between the two processes nothing happens, then when enough is produced i get a huge print (non the expected behaviour!) sometimes i wait many seconds (10-20 and more) between generate_out print and python print) what can i do? maybe communicate() is faster? anithing else? Thank you a lot!

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• Using Rails and Rspec, how do you test that the database is not touched by a method

  - by Will Tomlins

  So I'm writing a test for a method which for performance reasons should achieve what it needs to achieve without using SQL queries. I'm thinking all I need to know is what to stub: describe SomeModel do describe 'a_getter_method' do it 'should not touch the database' do thing = SomeModel.create something_inside_rails.should_not_receive(:a_method_querying_the_database) thing.a_getter_method end end end EDIT: to provide a more specific example: class Publication << ActiveRecord::Base end class Book << Publication end class Magazine << Publication end class Student << ActiveRecord::Base has_many :publications def publications_of_type(type) #this is the method I am trying to test. #The test should show that when I do the following, the database is queried. self.publications.find_all_by_type(type) end end describe Student do describe "publications_of_type" do it 'should not touch the database' do Student.create() student = Student.first(:include => :publications) #the publications relationship is already loaded, so no need to touch the DB lambda { student.publications_of_type(:magazine) }.should_not touch_the_database end end end So the test should fail in this example, because the rails 'find_all_by' method relies on SQL.

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• C++ iostream not setting eof bit even if gcount returns 0

  - by raph.amiard

  Hi I'm developping an application under windows, and i'm using fstreams to read and write to the file. I'm writing with fstream opened like this : fs.open(this->filename.c_str(), std::ios::in|std::ios::out|std::ios::binary); and writing with this command fs.write(reinterpret_cast<char*>(&e.element), sizeof(T)); closing the file after each write with fs.close() Reading with ifstream opened like this : is.open(filename, std::ios::in); and reading with this command : is.read(reinterpret_cast<char*>(&e.element), sizeof(T)); The write is going fine. However, i read in a loop this way : while(!is.eof()) { is.read(reinterpret_cast<char*>(&e.element), sizeof(T)); } and the program keeps reading, even though the end of file should be reached. istellg pos is 0, and gcount is equal to 0 too, but the fail bit and eof bit are both ok. I'm running crazy over this, need some help ...

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• .NET values lookup

  - by Maciej

  Hi, I have a feeling of missing something obvious. UDP receiver application. It holds a collection of valid UDP sender IPs - only guys with IP on that list will be considered. Since that list must be looked at on every packet and UDPs are so volatile, that operation must be maximum fast. Good choice is Dictionary but it is a key-value structure and what I actually need here is a dictionary-like (hash lookup) key only structure. Is there something like that? Small annoyance rather than a bug but still. I can still use Dictionary Thanks, M.

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• Intermittent NoClassDefFoundError error running Selenium JUnit tests

  - by Matt Sheppard

  For some time, I've been running a substantial set of JUnit / Selenium tests against a number of platforms on a nightly basis. Intermittently (about once in every 40 runs), all the tests for a given platform fail with a NoClassDefFoundError on the common superclass of all my tests as follows. java.lang.NoClassDefFoundError: [common super class of all my selenium tests] at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389) at java.lang.Class.getConstructors(Class.java:1459) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) Re-invoking the tests will generally get the tests running normally, so it's clearly something dependent on some condition I am not considering. What might be causing this error to occur seemingly randomly?

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• NHibernate Named Query Parameter Numbering @p1 @p2 etc

  - by IanT8

  A colleague recently ran into a problem where he was passing in a single date parameter to a named query. In the query, the parameter was being used twice, once in an expression and once in a GROUP BY clause. Much to our surprise, we discovered that NHibernate used two variables and sent the single named parameter in twice, as @p1 and @p2. This behaviour caused SQL to fail the query, with the usual "a column in the select clause is not in the group by clause" (I paraphrase ofcourse). Is this behaviour normal? Can it be changed? Seems to me that if you have a parameter name like :startDate, NHibernate only needs to pass in @p1 no matter how many times you might refer to :startDate in the query. Any comments? The problem was worked around by using another sub-query to overcome the SQL parsing error.

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• "conveyor belt" cache architecture

  - by Andrew Matthews

  I'm producing an application with a few peculiar internal communication characteristics that make the usual suspects for data storage and transport (Qs and RDBMSs) ill-fitted. I'm wondering whether there is a product out there that matches the following characteristics: all data put into it is peristent all reads are delivered out of memory data is universally available data lives where it is most needed data is versioned (nice to have) updates are transactional (I'd like ACID characteristics) data is potentially replicated, but always in sync works on windows is based on or has bindings for .NET is really fast is really robust is redundant is scalable I'm looking at things like Microsoft codename "Velocity", but I am not sure whether it fits all of the above characteristics. Likewise, Memcached is not a perfect fit either. The current version of this app opts for an RDBMS with a signaling system for inter-system sync, but latency is too high and versioning of the DB is a pain. I need all the robustness, but with none of the trade-offs.

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• DbMetal chokes on repeated foreign key references in SQLite - any ideas?

  - by DanM

  I've been struggling to get DbMetal to process my SQLite database. I finally isolated the problem. It won't allow a table to have two foreign key references to the same column. For example, a SQLite database with these two tables will fail: CREATE TABLE Person ( Id INTEGER PRIMARY KEY, Name TEXT NOT NULL ); CREATE TABLE Match ( Id INTEGER PRIMARY KEY, WinnerPersonId INTEGER NOT NULL REFERENCES Person(Id), LoserPersonId INTEGER NOT NULL REFERENCES Person(Id) ); I get this error: DbMetal: Sequence contains more than one matching element If I get rid of the second foreign key reference, no error occurs. So, this works: CREATE TABLE Match ( Id INTEGER PRIMARY KEY, WinnerPersonId INTEGER NOT NULL REFERENCES Person(Id), LoserPersonId INTEGER NOT NULL ); But I really need both "person" columns to reference the person table. I submitted a bug report for this, but I could use a workaround in the meantime. Any ideas?

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• What is the fastest way to copy content of DVD to hard disc using Linux

  - by Ritesh

  I have gone through some of the links Which talks about fastest way of copying files in windows using FILE_FLAG_NO_BUFFERING and FILE_FLAG_OVERLAPPED . It also talks about how request made for read and write opeartions with BUFFER SIZE as 256KB and 128KB are faster than 1Mb .The link for that is :- Explanation for tiny reads (overlapped, buffered) outperforming large contiguous reads? I am also loking for a Similar method in linux Which allows me to copy the content of my DVD to Hard Disc in a fast Way . So I wanted to know Is there some file operation flags in Linux which would provide me the best result or Which way of Copy in Linux is the best ? My codes are all in c++.

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• Split user.config into different files for faster saving

  - by HorstWalter

  In my c# Windows Forms application (.net 3.5 / VS 2008) I have 2 settings files resulting in one user.config file. One setting file consists of larger data, but is rarely changed. The frequently changed data are very few. However, since the saving of the settings is always writing the whole (XML) file it is always "slow". SettingsSmall.Default.Save(); // slow, even if SettingsSmall consists of little data Could I configure the settings somehow to result in two files, resulting in: SettingsSmall.Default.Save(); // should be fast SettingsBig.Default.Save(); // could be slow, is seldom saved I have seen that I can use the SecionInformation class for further customizing, however what would be the easiest approach for me? Is this possible by just changing the app.config (config.sections)?

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• Displaying/scrolling through heaps of pictures in the browser

  - by user347256

  I want to be able to browse through heaps of images in the browser, fast. THe easy way (just load 2000 images and scroll) slows down the scrolling a lot, assumedly because there's too much images to be kept in memory. I'd love to hear thoughts on strategies to be able to quickly scroll through 10000s of images (as if you were on your desktop) in the browser. What would expected bottlenecks be? How to address them? How to fake things so that the user experience is still good? Examples in the wild?

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• JQuery How to Uncheck A radio button

  - by user281867

  Hi, I have a list of data with a radio button. Users must select a date to edit. Then I load external dynamic form into a [div] using the jquery load() function. var ID = $('input[name=BookItem]:checked').val(); $("#EditFormWrapper").load("callEditData.cfm? ID="+ID); 2 Hours AM 2 Hours PM 2 Hours AM 2 Hours PM I am having trouble uncheck the radio button when user click on cancel button (editBTNcancel). The “BookItem” radio button is on the already on the webpage before the load() call. Here s my script: $("#editBTNcancel").live("click", function(event){ event.preventDefault(); $("#EditFormWrapper").slideUp("fast").empty(); //$('.TOR2Hours').removeAttr('checked'); $('.TOR2Hours').attr('checked', false); }); I hope I clearly state my problem, any suggestion would be greatly appreciated!

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• C# testing framework that works like JUnit in Eclipse?

  - by bluebomber357

  Hello all, I come from a Java/Eclipse background and I fear that I am spoiled by how easy it is to get JUnit and JMock running in Eclipse, and have that GUI with the bar and pass/fail information pop up. It just works with no hassle. I see a lot of great options for testing in C# with Visual Studio. NUnit looks really nice because it contains unit and mock testing all in one. The trouble is, I can't figure out how to get the IDE display my results. The NUnit documentation seems to show that it doesn't automatically show results through the VS IDE. I found http://testdriven.net/, which seems to trumpet that is makes VS display these stats and work with multiple frameworks, but it isn't open source. Is there anyway to get unit and mock testing working with the VS IDE like it does in Java with Eclipse?

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