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• Are IoC containers about configuration files?

  - by Jader Dias

  Recently I developed a performance tester console application, with no UI, with the help of a IoC containter (Castle-Windsor-Microkernel). This library enabled me to let the user choose which test(s) to run, simply by changing the configuration file. Have I realized what IoC containers are about? I'm not sure. Even Joel said here on SO that IoC are difficult to understand. From my example, what do you conclude? Am I using IoC container for exactly what they were designed for? Or I am just using one of its secondary features?

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• Linux - Create ftp account with read/write access to only 1 folder

  - by Gublooo

  Hey guys.... I have never worked on linux and dont plan on working on it either - The only command I probably know is "ls" :) I am hosting my website on Eapps and use their cpanel to setup everything so never worked with linux. Now I have this one time case - where I need to provide access to a contractor to fix the CSS issues on my website. He basically needs FTP (read/write) access to certain folders. At a high level - this is my code structure /home/webadmin/example.com/html/images /css /js /login.php /facebook.php /home/webadmin/example.com/application/library /views /models /controllers /config /bootstrap.php /home/webadmin/example.com/cgi-bin I want the new user to be able to have access to only these folders /home/webadmin/example.com/html/js /home/webadmin/example.com/html/css /home/webadmin/example.com/application/views He should not be able to view even the content of other folders including files like bootstrap.php or login.php etc If any sys admins can help me set this account up - will really appreciate it. Thanks

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• R: ggplot2, how to add a number of layers to a plot at once to reduce code

  - by John

  library(ggplot2) This code produces a nice looking plot: qplot(cty, hwy, data = mpg, colour = displ) + scale_y_log2() + labs(x="x axis") + labs(y="y axis") + opts(title = "my title") But I want to setup variables to try and to reduce code repetition: log_scale <- scale_y_log2() xscale <- labs(x="x axis") yscale <- labs(y="y axis") title <- opts(title = "my title") my_scales <- c(log_scale, xscale, yscale, title) # make a variable to hold the scale info changes above So that I can do this and add a bunch of things at the same time: qplot(cty, hwy, data = mpg, colour = displ) + my_scales # add these to your plot. but I get this error: Error in object$class : $ operator is invalid for atomic vectors I realize that the things going into my_scales need to be layers / different types of objects, but I don't see what they should be.

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• C++ to bytecode compiler for Silverlight CLR?

  - by paleozogt

  I'd like to be able to compile a C/C++ library so that it runs within a safe managed runtime in the Silverlight CLR. There are several tools for doing this with the JVM that allows C++ code to run within a CRT emulation layer (see NestedVM, LLJVM, etc), which effectively allows C++ code to be run within a Java Applet. There's even a tool for this for the Adobe Flash VM (see Alchemy). However, I can't seem to find any tools like this for the CLR. fyi, the MSVC tools don't seem to allow for this: The /clr:pure flag will create C++ code that runs in the CLR, but it isn't safe (because the CRT isn't safe) and /clr:safe requires massive code changes (no native types, etc).

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• Cocoa touch SDK 3.2 - How to play video

  - by teepusink

  Hi, How do I play video on SDK 3.2 (iPad)? Read many questions here but they talked mostly for iPhone. For example, the MoviePlayer example here http://developer.apple.com/iphone/library/samplecode/MoviePlayer_iPhone/Introduction/Intro.html That works on 3.1.3 but when I run it on 3.2, it doesn't work. So basically I'm able to play a video on 3.1.3 using this code but the same code won't run on 3.2 NSString *moviePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Movie.mp4"]; MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:moviePath]]; moviePlayer.movieControlMode = MPMovieControlModeDefault; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayer]; [moviePlayer play]; Thanks, Tee

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• C/C++ Allegro program causes Windows 7 to switch to Aero Basic

  - by Matt H

  Hi SO, I'm just trying out the allegro library, and here is the code which I've got so far: #include <allegro.h> int main(int argc, char *argv[]) { allegro_init(); // initialize the allegro libraries install_keyboard(); // initialize keyboard functions set_color_depth(16); // set the color depth set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0); // set up 640*480px window BITMAP *pic = NULL; pic = load_bitmap("C:/picture.bmp", NULL); // load the picture blit(pic, screen, 0, 0, 0, 0, 1000, 1000); readkey(); destroy_bitmap(pic); return 0; } END_OF_MAIN() It works fine, but when I run it, while the program's window is open, Windows 7 changes the theme from Aero to Aero basic. If you aren't sure what I mean, this pops up (I got this from Google, which is why it says Vista rather than Windows 7): 1) Why? 2) How can I ensure that this doesn't happen?

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• Parsing Indentation-based syntaxes in Haskell's Parsec

  - by pavpanchekha

  I'm trying to parse an indentation-based language (think Python, Haskell itself, Boo, YAML) in Haskell using Parsec. I've seen the IndentParser library, and it looks like it's the perfect match, but what I can't figure out is how to make my TokenParser into an indentation parser. Here's the code I have so far: import qualified Text.ParserCombinators.Parsec.Token as T import qualified Text.ParserCombinators.Parsec.IndentParser.Token as IT lexer = T.makeTokenParser mylangDef ident = IT.identifier lexer This throws the error: parser2.hs:29:28: Couldn't match expected type `IT.TokenParser st' against inferred type `T.GenTokenParser s u m' In the first argument of `IT.identifier', namely `lexer' In the expression: IT.identifier lexer In the definition of `ident': ident = IT.identifier lexer What am I doing wrong? How should I create an IT.TokenParser? Or is IndentParser broken and to be avoided?

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• XCode newbie: How to find the source code for standard or system libraries?

  - by Jan Hettich

  XCode newbie question here: If I'm programming in C++ or objective C, and I #include or #import a library; e.g. #include <iostream> #import <Cocoa/Cocoa.h> I'm often not sure where to look for these header files in the directory structure on my Mac. In other development environments, you can right click the included or imported filename and have the option to jump to source. Is there such a feature in XCode? Also, for the standard C++ libraries and the Cocoa framework, is the source code for the implementation files available, or only the headers together with compiled link libraries? Thanks!

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• Suppressing default anchor behavior in Safari with jQuery

  - by Macy Abbey

  Hello, I am attempting to prevent default anchor behavior in Safari using the jQuery library. Unfortunately, the standard techniques of returning false or using event.preventDefault() do not seem to be working in Safari. Could anyone help me with this issue? The code I'm working with is like this: $('#main .green-tabs a').live("click",function(event){ $('.green-tabs a').removeClass('active'); $(this).addClass('active'); event.preventDefault(); var that = this; return LolPage(event,that);});

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• Save a camera photo with an overlayed image - iphone SDK

  - by user157733

  I think this should be simple but I am having some difficulty implementing it. I take a photo from the camera, the user can then move and scale it. They then choose "use" and they get a preview of their image. Now what I want to do is overlay an image on top of this preview image - which is also ok. But the part I am having difficulty is then I want to save the photo taken WITH the image that is over it into the library. I just have a UIView with my overlay image about the UIView where my camera photo is previewed. I guess I just need to take a screen capture of these? I don't want to loose resolution OR end up with my UI buttons etc in the final image. Any suggestions or links would be really useful. Thanks :-)

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• Coordinate geometry operations in images/discrete space

  - by avd

  I have images which have line segments, rays etc. I am representing these line segments using Bresenham algorithm (means whatever coordinates I get using this algorithm between two points). Now I want to do operations such as finding intersection point between two line segments, finding the projection of one vector onto other etc... The problem is I am not working in continuous space. The line segments are being approximated using Bresenham algorithm. So I want suggestions on what are the best and most efficient ways to do this? A link to C++ library or implementation would also be good enough. Please suggest some books which deal with such problems.

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• FCKeditor in jQuery ui dialog not working

  - by zilverdistel

  Hi folks, I'm having serious trouble getting this to work in IE7/8. In FF, everything works as expected. When the user clicks on a certain link, a modal dialog popup is shown. In this dialog, there is a form, which contains one textarea, that is replaced with a FCK instance. The form is loaded from the server using ajax on the clientside and php on the serverside. There's one strange way to get the FCK editor shown, and that is by resizing the dialog. Library versions: jquery: 1.3.2 jquery ui: 1.7.3 FCKeditor: 2.6.1 build 19297 Any help would be strongly appreciated, I'm on a deadline here :-(

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• Flash video player VS HTML 5 Video.....

  - by metal-gear-solid

  I need to add a video player to play a video on a webpage. usually i use Flash player with the help of swfobject library. which works if flash player and javascript both are enabled. I'm currently using XHTML 1.0 strict doctype. My question is can i just change my doctype to HTML 5 doctype and add Video player using HTML 5 video. for browser which do not support HTML5 i can a a javascript. in this condition in supported browser Video will work without Flash player and javascript and in non-supported browser will work with js support. Is this possible? Is this a good idea?

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• initializer_list and move semantics

  - by FredOverflow

  Am I allowed to move elements out of a std::initializer_list<T>? #include <initializer_list> #include <utility> template<typename T> void foo(std::initializer_list<T> list) { for (auto it = list.begin(); it != list.end(); ++it) { bar(std::move(*it)); // kosher? } } Since std::intializer_list<T> requires special compiler attention and does not have value semantics like normal containers of the C++ standard library, I'd rather be safe than sorry and ask.

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• problem with dmg file

  - by madalina

  Hello, I have created a dmg file named try.dmg which contains an executable application myapplication.app together with a compiled library mylibrary.lib; I used Disk Utility in order to create the try.dmg file. I mounted the try.dmg file on my computer and I opened the application myapplication.app with no problems. Still, I tried to do the same thing on another Macintosh, with the same operating system Mac OS X, but I got some problems: I mounted the try.dmg file and then when I tried to open the application myapplication.app I got an error message, that the application has quit unexpectedly. Can someone explain me what is it happening? How come this try.dmg file can be mounted and the application can be opened with no problems on my computer with Mac OS X, but on another computer with Mac OS X, after I mount the try.dmg file I get errors when I try opening the application? Thank you very much for your help. Best wishes, Madalina

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• use jquery autocomplete with carousel for preview and selection

  - by dave

  Hi, I've successfully used jquery autocomplete to display a list of matching images based on user input. The user experience isn't great though due to the number of potential matches - even with fairly prescriptive input. I've found this example at nokia http://www.nokia.co.uk/support/download-software/device-software-update (I know it's written in flash) which would provide the ideal interface for what I'm trying to achieve. Does anyone have any pointers for doing this using jquery autocomplete as a starting point? Or better still know of an existing javascript library that provides this functionality? I'm using the latest release of jquery if that matters. Thanks, Dave.

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• Good reasons to migrate PHP libraries to namespaces

  - by Joseph Mastey

  I have a significant number of object libraries written for PHP 5.2.5, and I'm trying to weigh the benefits of retrofitting them for namespaces. I don't have any concerns about the server PHP version at the moment, since any relevant machines are under my control, so I'm not worried about backwards compatibility. As far as the structure of the libraries, I use the same convention as Zend Framework, (Library_Module_Class_Name e.g.) so I don't currently have any naming conflicts internal to the libraries. I'd anticipate moving the Library and Module parts of those classnames to namespaces. That said, if the code is already written, is there any good reason to move over to namespaces? Thanks, Joe

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• Code reading: where can i read great, modern, and well-documented C++ code?

  - by baol

  Reading code is one of the best ways to learn new idioms, tricks, and techniques. Sadly it's very common to find badly written C++ code. Some use C++ as it was C, others as if it was Java, some just shoot in their feet. I believe gtkmm is a good example of C++ design, but a binding could not be the better code to read (you need to know the C library behind that). Boost libraries (at least the one I read) tend to be less readable than I'd like. Can you mention open source projects (or other projects which source is freely readable) that are good example of readable, modern, well-documented, and auto-contained, C++ code to learn from? (I believe that one project per answer will be better, and I'd include the motivation that led you to selecting that one.)

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• Using boost.python to import a method with opencv calls but failing due to symbols not being found a

  - by nmz787

  So I don't have the code right now, as I am not home... but i used the boost library for python in C++ to allow python to access a function called something like loadImageIntoMainWindow(string filepath) in the C++ source code the method calls opencv methods that are imported at the top of the file, I included opencv in my Jamroot file, and also found a way to compile and link manually on the command line... in either case when I run my python file it complains that the symbols aren't found for the first function call to an opencv method... I will update as soon as I get home with the C++, the command line compilation lines, the Jamroot, and the python files

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• KO 2.3.4 - Accessing validation array from callbacks in models

  - by kenny99

  Hi, Apologies if this is an oversight or sheer stupidity on my part but I can't quite figure out how to access the validation array from a callback in a model (using ORM and KO 2.3.4). I want to be able to add specific error messages to the validation array if a callback returns false. e.g This register method: public function register(array & $array, $save = FALSE) { // Initialise the validation library and setup some rules $array = Validation::factory($array) ->pre_filter('trim') ->add_rules('email', 'required', 'valid::email', array($this, 'email_available')) ->add_rules('confirm_email', 'matches[email]') ->add_rules('password', 'required', 'length[5,42]') ->add_rules('confirm_password', 'matches[password]'); return ORM::validate($array, $save); } Callback: public function email_available($value) { return ! (bool) $this->db ->where('email', $value) ->count_records($this->table_name); } I can obviously access the current model from the callback, but I was wondering what the best way to add custom error from the callback would be?

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• NHibernate mapping one table on two classes with where selection

  - by Rene Schulte

  We would like to map a single table on two classes with NHibernate. The mapping has to be dynamically depending on the value of a column. Here's a simple example to make it a bit clearer: We have a table called Person with the columns id, Name and Sex. The data from this table should be mapped either on the class Male or on the class Female depending on the value of the column Sex. In Pseudocode: create instance of Male with data from table Person where Person.Sex = 'm'; create instance of Female with data from table Person where Person.Sex = 'f'; The benefit is we have strongly typed domain models and can later avoid switch statements. Is this possible with NHibernate or do we have to map the Person table into a flat Person class first? Then afterwards we would have to use a custom factory method that takes a flat Person instance and returns a Female or Male instance. Would be good if NHibernate (or another library) can handle this.

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• Power Law distribution for a given exponent in C# using MathNet

  - by Eric Tobias

  Hello! I am currently working on a project where I need to generate multiple values (floats or doubles preferably) that follow a power law distribution with a given exponent! I was advised to use the MathNet.Iridium library to help me. The problem I have is that the documentation is not as explicit as it should be if there is any! I see multiple distributions that fit the general idea of the power law distribution but I cannot pinpoint a good distribution to use with a certain exponent as a parameter. Does anybody have more experience in that matter and could give me some hints or advice?

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• Intersection of line with cube and knowing the point of intersection.

  - by Raj

  Hello everyone, description 1.lines are originating from origin(0,0,0). 2.lines are at some random angle to the Normal of Top face of teh cube. 3.if the lines are intersecting cube , calculate the intersection point. 4.mainly i wan to know how much distance ,line traveled inside the cube. I dont know exactly which approach should i take , i will be pleased and thankful if someone could guied me to the right direction, to use OpenGL, DirectX or some other library, for C# . some example or sample will be appriciated.

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• What is the correct usage of blueprint-typography-body([$font-size])?

  - by Alexis Abril

  Recent convert to RoR and I've been using Compass w/ Blueprint to dip into the proverbial pool. Compass has been fantastic, but I've come across something strange within the Typography library. The blueprint-typography-body mixin contains the following: =blueprint-typography-body($font-size: $blueprint-font-size) line-height: 1.5 +normal-text font-size: 100% * $font-size / 16px My question revolves around "font-size." I'm a bit lost, as I would expect to pass in a font size and have that size reflected upon page load. However, in this scenario the formula seems to dictate a percentage against the default font. ie: +blueprint-typography-body(10px) //produces 7.5px off of the default font size of 12px from what I can tell. In essence, I'm curious if there is a standard to setting font size within Compass other than explicitly declaring "font-size: 10px". Note: The reason I'm leaning towards Blueprint/Compass font stylings is due to the standardization of line-heights, fonts and colors.

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• Loading and storing encryption keys from a config source

  - by Hassan Syed

  I am writing an application which has an authenticity mechanism, using HMAC-sha1, plus a CBC-blowfish pass over the data for good measure. This requires 2 keys and one ivec. I have looked at Crypto++ but the documentation is very poor (for example the HMAC documentation). So I am going oldschool and use Openssl. Whats the best way to generate and load these keys using library functions and tools ? I don't require a secure-socket therefore a x.509 certificate probably does not make sense, unless, of-course, I am missing something. So, do I need to write my own config file, or is there any infrastructure in openssl for this ? If so, could you direct me to some documentation or examples for this.

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