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• Pretty print code to PDF

  - by Joel

  I'm searching for a tool that will take a source directory and produce a single PDF containing the source code, preferably with syntax highlighting. I would like to read the PDF on my phone, in order to get familiar with a code-base, or just to see what I can learn by reading a lot of code. I will most often be reading Ruby. I would prefer if the tool ran on Linux. I don't mind paying for a tool if it is particularly good. Any suggestions?

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• Integer Linear Programming Java: Multiple Open Source and Commercial tools are available. Which one

  - by Sandeep Jindal

  Hi, I need to use Integer Linear Programming API/Tool for my application. Though my application is in Java but I don’t mind calling an EXE (Tool) from Java providing input using file (MPS, etc). My search analysis is as follows: There are multiple Open Source and Commercial tools available to solve ILP Following I found and think are useful for my needs. 1. Gnu LP Kit(GLPK): I think this is the oldest and probably most stable and efficient 2. IP_Solve: Has good reviews about it. 3. JavaILP: Found this, but not much reviews about it 4. Apache Common-Math: Supports LP but not ILP, so ruled out. 5. Coin-OR Can you please suggest which one shall be the best in terms of stability, efficiency, acceptance, etc Regards Sandeep Jindal

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• How should one import large amounts of data for FIT/Fitnesse tests?

  - by Lachlan

  We have a scheduling engine with large amounts of test data to test all the scenarios, so test automation is critical. We're currently hoping to use FIT/Fitnesse. However a single test has quite a large table of test data, so it doesn't fit very well into the mould of "two or three inputs, one or more outputs" that Fitnesse uses in its examples. Hopefully the other functionality of Fitnesse makes it worth using it. I hear that there is a way to initialize an application for a FIT test with an Excel spreadsheet - not the Spreadsheet to Fitness function, mind you - but I haven't been able to find it so far. Once the whole spreadsheet is loaded into the application, and the application does its thing, we plan to compare either a number of output rows, or perhaps just the last row, to see if the test passes. The application is currently pulling test data from a database for manual tests, but writing to a database, then initializing from it, is not preferred because of the performance impact. The application is written in C#.

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• IOC Container Handling State Params in Non-Default Constructor

  - by Mystagogue

  For the purpose of this discussion, there are two kinds of parameters an object constructor might take: state dependency or service dependency. Supplying a service dependency with an IOC container is easy: DI takes over. But in contrast, state dependencies are usually only known to the client. That is, the object requestor. It turns out that having a client supply the state params through an IOC Container is quite painful. I will show several different ways to do this, all of which have big problems, and ask the community if there is another option I'm missing. Let's begin: Before I added an IOC container to my project code, I started with a class like this: class Foobar { //parameters are state dependencies, not service dependencies public Foobar(string alpha, int omega){...}; //...other stuff } I decide to add a Logger service depdendency to the Foobar class, which perhaps I'll provide through DI: class Foobar { public Foobar(string alpha, int omega, ILogger log){...}; //...other stuff } But then I'm also told I need to make class Foobar itself "swappable." That is, I'm required to service-locate a Foobar instance. I add a new interface into the mix: class Foobar : IFoobar { public Foobar(string alpha, int omega, ILogger log){...}; //...other stuff } When I make the service locator call, it will DI the ILogger service dependency for me. Unfortunately the same is not true of the state dependencies Alpha and Omega. Some containers offer a syntax to address this: //Unity 2.0 pseudo-ish code: myContainer.Resolve<IFoobar>( new parameterOverride[] { {"alpha", "one"}, {"omega",2} } ); I like the feature, but I don't like that it is untyped and not evident to the developer what parameters must be passed (via intellisense, etc). So I look at another solution: //This is a "boiler plate" heavy approach! class Foobar : IFoobar { public Foobar (string alpha, int omega){...}; //...stuff } class FoobarFactory : IFoobarFactory { public IFoobar IFoobarFactory.Create(string alpha, int omega){ return new Foobar(alpha, omega); } } //fetch it... myContainer.Resolve<IFoobarFactory>().Create("one", 2); The above solves the type-safety and intellisense problem, but it (1) forced class Foobar to fetch an ILogger through a service locator rather than DI and (2) it requires me to make a bunch of boiler-plate (XXXFactory, IXXXFactory) for all varieties of Foobar implementations I might use. Should I decide to go with a pure service locator approach, it may not be a problem. But I still can't stand all the boiler-plate needed to make this work. So then I try this: //code named "concrete creator" class Foobar : IFoobar { public Foobar(string alpha, int omega, ILogger log){...}; static IFoobar Create(string alpha, int omega){ //unity 2.0 pseudo-ish code. Assume a common //service locator, or singleton holds the container... return Container.Resolve<IFoobar>( new parameterOverride[] {{"alpha", alpha},{"omega", omega} } ); } //Get my instance: Foobar.Create("alpha",2); I actually don't mind that I'm using the concrete "Foobar" class to create an IFoobar. It represents a base concept that I don't expect to change in my code. I also don't mind the lack of type-safety in the static "Create", because it is now encapsulated. My intellisense is working too! Any concrete instance made this way will ignore the supplied state params if they don't apply (a Unity 2.0 behavior). Perhaps a different concrete implementation "FooFoobar" might have a formal arg name mismatch, but I'm still pretty happy with it. But the big problem with this approach is that it only works effectively with Unity 2.0 (a mismatched parameter in Structure Map will throw an exception). So it is good only if I stay with Unity. The problem is, I'm beginning to like Structure Map a lot more. So now I go onto yet another option: class Foobar : IFoobar, IFoobarInit { public Foobar(ILogger log){...}; public IFoobar IFoobarInit.Initialize(string alpha, int omega){ this.alpha = alpha; this.omega = omega; return this; } } //now create it... IFoobar foo = myContainer.resolve<IFoobarInit>().Initialize("one", 2) Now with this I've got a somewhat nice compromise with the other approaches: (1) My arguments are type-safe / intellisense aware (2) I have a choice of fetching the ILogger via DI (shown above) or service locator, (3) there is no need to make one or more seperate concrete FoobarFactory classes (contrast with the verbose "boiler-plate" example code earlier), and (4) it reasonably upholds the principle "make interfaces easy to use correctly, and hard to use incorrectly." At least it arguably is no worse than the alternatives previously discussed. One acceptance barrier yet remains: I also want to apply "design by contract." Every sample I presented was intentionally favoring constructor injection (for state dependencies) because I want to preserve "invariant" support as most commonly practiced. Namely, the invariant is established when the constructor completes. In the sample above, the invarient is not established when object construction completes. As long as I'm doing home-grown "design by contract" I could just tell developers not to test the invariant until the Initialize(...) method is called. But more to the point, when .net 4.0 comes out I want to use its "code contract" support for design by contract. From what I read, it will not be compatible with this last approach. Curses! Of course it also occurs to me that my entire philosophy is off. Perhaps I'd be told that conjuring a Foobar : IFoobar via a service locator implies that it is a service - and services only have other service dependencies, they don't have state dependencies (such as the Alpha and Omega of these examples). I'm open to listening to such philosophical matters as well, but I'd also like to know what semi-authorative reference to read that would steer me down that thought path. So now I turn it to the community. What approach should I consider that I havn't yet? Must I really believe I've exhausted my options?

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• how to temporarily set makeprg in vim

  - by Haiyuan Zhang

  In the normal case I use vim's make utility I will set makeprg to the Makefile of the project I'm currently working for. Since usually the project will last for weeks or even longer, I don't need to change the setting of makeprg very often . But sometimes I need to write some "foobar" code either for practicing my c++ skill or for prototyping some primitive ideas in my mind. So whenever I switch to the "foobar" mode of vim usage, I need to comments the original makeprg setting add the new setting as following : au FileType c set makeprg=gcc\ % au FileType cpp set makeprg=g++\ % which is really very very inconvenient . when I back to the "normal project mode" of vim usage, I need to change back to the original setting . back and forth .... what I want to know from you guys is that : is it possible to make the setting of makeprg temporarily . for example , define a function in which first set a local value of makeprg and then call make before return form the function call automatically restore makeprg to the value before the function call.

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• Which Python API should be used with Mongo DB and Django

  - by Thomas

  I have been going back and forth over which Python API to use when interacting with Mongo. I did a quick survey of the landscape and identified three leading candidates. PyMongo MongoEngine Ming If you were designing a new content-heavy website using the django framework, what API would you choose and why? MongoEngine looks like it was built specifically with Django in mind. PyMongo appears to be a thin wrapper around Mongo. It has a lot of power, though loses a lot of the abstractions gained through using django as a framework. Ming represents an interesting middle ground between PyMongo and MongoEngine, though I haven't had the opportunity to take it for a test drive.

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• Aaron Hillegass Chapter 18 Challenge Question

  - by jasonbogd

  I am working through Aaron Hillegass' Cocoa Programming for Mac OS X and am doing the challenge for Chapter 18. Basically, the challenge is to write an app that can draw ovals using your mouse, and then additionally, add saving/loading and undo support. I'm trying to think of a good class design for this app that follows MVC. Here's what I had in mind: Have a NSView-subclass that represents an oval (say JBOval) that I can use to easily draw an oval. Have a main view (JBDrawingView) that holds JBOvals and draws them. The thing is that I wasn't sure how to add archiving. Should I archive each JBOval? I think this would work, but archiving an NSView doesn't seem very efficient. Any ideas on a better class design? Thanks.

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• Batch file script to remove special characters from filenames (Windows)

  - by njreed.myopenid.com

  I have a large set of files, some of which contain special characters in the filename (e.g. ä,ö,%, and others). I'd like a script file to iterate over these files and rename them removing the special characters. I don't really mind what it does, but it could replace them with underscores for example e.g. Störung%20.doc would be renamed to St_rung_20.doc In order of preference: A DOS batch file A Windows script file to run with cscript (vbs) A third party piece of software that can be run from the command-line (i.e. no user interaction required) Another language script file, for which I'd have to install an additional script engine Background: I'm trying to encrypt these file with GnuPG on Windows but it doesn't seem to handle special characters in filenames with the --encrypt-files option.

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• C# timer won't tick

  - by Andrej

  hi, i have a strange problem... I've been going out of my mind for the past couple of hours... the timer i put in my winform code (from the toolbar) won't tick... I have timers on a couple of forms in my program, they all work fine... I try to do exactly the same it this it won't tick... I select it, drag it on to a form, enable it, set interval and handle the tick event... and nothing happens... i even tried putting random code like messagebox.show in the tick event just to see if anything happens, and nothing!!! as I said, a have a couple of more timer in my program (on other forms, not in the one i'm trying to put this timer) and they all work fine... any suggestions? thanks in advance!

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• What components of your site do you typically "offload" or embed?

  - by Chad

  Here's what I mean. In developing my ASP.NET MVC based site, I've managed to offload a great deal of the static file hosting and even some of the "work". Like so: jQuery for my javascript framework. Instead of hosting it on my site, I use the Google CDN Google maps, obviously "offloaded" - no real work being performed on my server - Google hosted jQueryUI framework - Google CDN jQueryUI CSS framework - Google CDN jQueryUI CSS framework themes - Google CDN So what I'm asking is this, other than what I've got listed... What aspects of your sites have you been able to offload, or embed, from outside services? Couple others that come to mind... OpenAuth - take much of the authentication process work off your site Google Wave - when it comes out, take communication work off of your site

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• What is best way to raise application events for use with admin network monitoring tools

  - by J Cooper

  In a semi-critical .NET service application, what would be a good strategy for raising application events that could be monitored by network administration tools? The events would be for errors, status changes, and possibly other notifications. My company is planning to use some kind of tool down the road to monitor all critical machines and services. As of right now they are using Spice Works to do some monitoring but it is not known if they will keep this down the road. By strategy I mean, perhaps using some sort of protocol ( my network admin has mentioned SNMP), perhaps a service such as windows event log. I have no idea what is available, so I'm leaving the options open. With that in mind, here is a list of preferences I came up with: Somewhat easy to use with .NET. Reliability Should work well with a variety of admin monitoring tools Works with non - windows monitoring tools Works with Spice Works

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• C# Multithreading File IO (Reading)

  - by washtik

  We have a situation where our application needs to process a series of files and rather than perform this function synchronously, we would like to employ multi-threading to have the workload split amongst different threads. Each item of work is: 1. Open a file for read only 2. Process the data in the file 3. Write the processed data to a Dictionary We would like to perform each file's work on a new thread? Is this possible and should be we better to use the ThreadPool or spawn new threads keeping in mind that each item of "work" only takes 30ms however its possible that hundreds of files will need to be processed. Any ideas to make this more efficient is appreciated.

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• Noob-Ready Cython Tutorials

  - by spearfire

  I know a bunch of scripting languages, (python, ruby, lua, php) but I don't know any compiled languages like C/C++ , I wanted to try and speed up some python code using cython, which is essentially a python - C compiler, aimed at creating C extensions for python. Basically you code in a stricter version of python which compiles into C - native code. here's the problem, I don't know C, yet the cython documentation is aimed at people who obviously already know C (nothing is explained, only presented), and is of no help to me, I need to know if there are any good cython tutorials aimed at python programmers, or if I'm gonna have to learn C before I learn Cython. bear in mind I'm a competent python programmer, i would much rather learn cython from the perspective of the language I'm already good at, rather than learn a whole new language in order to learn cython. 1) PLEASE don't recommend psyco edit: ANY information that will help understand the oficial cython docs is useful information

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• Back button loop with IFRAMES

  - by Tim Jackson

  In my (school) website we use Iframes to display class blogs (on blogger). This works well EXCEPT if the user then clicks on (say) a photo inside the iframe. Blogger (in this case) then displays the photo in the whole browser window and the back button loops; that is if the back button is hit, the browser (IE, FF, Chrome) stays on the same page. The only way out is for the user to jump back two pages (which many of our users don't know how to do). I've read a lot of posts on back buttons and iframes and there doesn't appear to be a simple solution. Bear in mind that I don't have control over the iframe content (so no embedded back buttons in the frame are possible). Ideas anyone?

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• PHP mySQL count number of fields not empty

  - by Pez Cuckow

  I have a database of users where they can send messages to other users (up to four) and the ID of the message they sent is in their user row. e.g. Name, Email, Msg1, Msg2, Msg3, Msg4 Pez, [email protected], 1, 55, 42, 5 //Send 4 messages Steve, [email protected], 0, 0, 0, 0 //Send 0 messages Leon, [email protected], 3, 0, 3, 5 //Send 3 messages How in a MySQL query can I get the amount of those message rows that are not empty or not equal to 0, allowing me to order by that? So it would return Pez - 4 Mesasges Leon - 3 Messages Steve - 0 Messages Im my mind something like order by count(!empty(msg1)+!empty(msg2)+!empty(msg3)+!empty(msg4)) Many thanks,

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• What way to use the CGContext to draw is suitable?

  - by Tattat

  I know that the CGContext cannot call it to draw directly, and it needs to fill the drawing logic in the drawInContext, and call the CGContext to draw using "setNeedsDisplay", so, I designed a cmd to execute, but it cause some problems... like this : http://stackoverflow.com/questions/2617827/why-i-cant-draw-in-a-loop-using-uiview-in-iphone I think the CGContext is very different from my previous programming experience....(I used HTML5 canvas, that allow me add more details, after I draw, so do the Java Swing) Actually, I want to know what is the suitable to implement these kind of thing in Apples' programmer mind. Thz.

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• Is it possible to Embed Gecko or Webkit in a Windows Form just like a WebView?

  - by Martín Marconcini

  Hi, I'd love to know if there is such thing as a Gecko.NET ;) I mean, just like we can embed a WebView and that is an "instance" of IE7 inside any Windows Forms application (and tell it to "navigateto (fancy_url);", I'd love to use FireFox or WebKit. Anybody tried this? UPDATE: Please bear in mind that although it is possible to embed gecko using the mentioned controls, it is still impossible to print while using gecko. UPDATE March 2010: It’s still not possible to print natively using GeckoFX, however a couple of methods exist that may be enough, depending upon what you’re trying to do. See: http://geckofx.org/viewtopic.php?id=796 for more information.

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• Selecting Users For A/B (Champion/Challenger) Testing

  - by Gordon Guthrie

  We have a framework that offers A/B split testing. You have a 'champion' version of a page and you develop a 'challenger' version of it. Then you run the website and allocate some of your users the champion and some the challenger and measure their different responses. If the challenger is better than the champion at achieving your metrics then you dethrone the champion and develop a new challenger... My question is what mechanisms should I consider to allocate the versions? A number of options spring to mind: odd or even IP address (or sub-segments) ****.****.****.123 gets champion but .124 gets challenger cookie push - check for a champion/challenger cookie, if it doesn't exist randomly allocate the user to one and push the cookie Best practice? suggestions? comments? experience?

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• PHP - How to use Php inside Php?

  - by Dodi300

  Hello. Can someone tell/show me how to use PHP inside PHP. I'm trying to make the URL of an image change depending on what value is in a MySQL database. Here's an example of what I'm trying to do. Bear in mind that $idx already has a value from the URL of the page. <?php $query = "SELECT * FROM comment WHERE uname='$idx'"; $result = mysql_query($query); while($row = mysql_fetch_array($result, MYSQL_ASSOC)) { echo "<img src='' name='comm' width='75px' height='60px' id='mainimage' />"; } ?> How would I make the source value, for the image, come from a different table?

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• What is a Perl regex for finding the first non-consecutively-repeating character in a string.

  - by DVK

  Your task, should you choose to accept it, is to write a Perl regular expression that for a given string, will return the first occurence of a character that is not consecutively duplicated. In other words, both preceded AND succeeded by characters different from itself (or start/end of string respectively). Example: IN: aabbcdecc OUT: c Please note that "not consecutively duplicated" does not mean "anywhere in the string". NOTE: it must be a pure regex expression. E.g. the solution that obviously comes to mind (clone the string, delete all the duplicates, and print the first remaining character) does not count, although it solves the problem. The question is inspired by my somewhat off-topic answer to this: http://stackoverflow.com/questions/2548606/perl-function-to-find-first-non-repeating-character-in-a-string

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• Is it worth learning Perl 6?

  - by Andres

  I have the opportunity to take a two day class on Perl 6 with the Rakudo Compiler. I don't want to start a religious war, but is it worth my time? Is there any reason to believe that Perl 6 will be practical in the real world within the next two years? Does anyone currently use it effectively? Update I took the class and learned a lot. However, after day 1, my mind was a bit overwhelmed. There are tons of cool ideas in perl 6, and it will be neat to see what filters up to other languages. Overall the experience was a positive use of my time, though I wasn't able to absorb as much on the second day. If it were a three day class it would have been unproductive just because there is a limit to how much you can process in a short amount of time.

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• Unique identifier for an email

  - by Skywalker

  I am writing a C# application which allows users to store emails in a MS SQL Server database. Many times, multiple users will be copied on an email from a customer. If they all try to add the same email to the database, I want to make sure that the email is only added once. MD5 springs to mind as a way to do this. I don't need to worry about malicious tampering, only to make sure that the same email will map to the same hash and that no two emails with different content will map to the same hash. My question really boils down to how one would combine multiple fields into one MD5 (or other) hash value. Some of these fields will have a single value per email (e.g. subject, body, sender email address) while others will have multiple values (varying numbers of attachments, recipients). I want to develop a way of uniquely identifying an email that will be platform and language independent (not based on serialization). Any advice?

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• What's the best JSF implementation?

  - by Jeff

  Hey everyone, I currently have a medium size Java web application sitting on top of Spring MVC. As much as I like (no sarcasm) coding straight HTML, CSS and JS, it's not possible for me to develop as fast as I'd like. I'm looking at different RAD frameworks to speed up my development. I'm looking at JSF implementations and component libraries, Flex, GWT and a few others. As of now, Apache MyFaces (with ICEFaces) seems to be the front runner in my mind, but I'm curious to find out what you all think of that specific implementation and if the Sun implementation is any better? What's important to me is something that is stable, has an active community and that it doesn't look like there is another technology in the near future that is going to eclipse JSF (which would drive me to use a different RAD framework). Thanks in advance for the responses.

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• What's the best way to create a Windows Mobile application with multiple screens in C#

  - by Joseph Earl

  I am creating a Windows Mobile Application in C# and Visual Studio 2008. The application will have 5-6 main 'screens'. There will also be bar (/area) with information (e.g. a title, whether the app is busy, etc) above the screens, and a toolbar (or similar control) below the screens with 5-6 buttons (with images) to change the active screen (i.e. the screens will share the top bar and toolbar) What is the best way to implement this? Use multiple forms, and just include the toolbar and top-bar in each Use a single form and something like the Tab control (but customised) to contain the screens Something else? Keeping in mind a) memory usage and b) time to switch screens. Thanks in advance. Any links, pointers etc are much appreciated.

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• What are the preferred versions of Vim and Emacs on Mac OS X?

  - by Michiel de Mare

  For those of us that like to use the graphical version of Vim or Emacs, instead of the console version, which version do you recommend? For Vim, there's Mac OS X Vim, MacVim, Vim-Cocoa. For Emacs, CarbonEmacs, XEmacs, and Aquamacs. Are there more? Which of these are ready for prime-time? If it's a tough call, what are the trade-offs? Are all of these still being maintained? No discussion of Vim vs. Emacs, if you don't mind, or comparisons with other editors.

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