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• Paypal adaptive payment API call with C# .NET? Preferably with WebServices

  - by Phil

  Okay I might be entirely off track now but here goes: Our "webshop" offers two functions, buying a specific product and selling it back to us. Back-end handles if the user can sell or not. I've decided to use Paypal's adaptive payments for this one as it seems the way to go doing these kinds of transactions. I've never implemented any kind of shop so I'm totally green with this one. I only recently learned ASP.NET and have mainly developed games before moving to this kind of development. HTTP is still some level of magic to me hehe.. I might be confused but I think paypal offers a webservice with their adaptive payment API. My humble request: A nice soul who wants to share an example of implementing an adaptive payment API call with C# .NET. If they don't offer it as a webservice I'll probably find it as a custom .dll or something. Any tips and examples are highly appreciated! Thanks for reading

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• Stress Test tool for Password Protected Website

  - by Jason

  We need to run a stress test on a password protection section of a website we host. What tool (paid or free) would be best for us to use for this? We'd like to be able to create several 'scripts' and then have the stress test simulate X number of users. Each script will have us login as a specific user and then click on some links and submit forms to simulate an actual user. Ideally the software would also create some nice data exports/charts. Server is a linux web server, but we could run this on linux or Windows so software that will run on either is fine.

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• When to use AsyncOperation and AsyncOperationManager

  - by Sir Psycho

  Hi, I've spent many many hours tonight reading up on implementing the event-based asynchronous pattern Unfortunately, I haven't been able to find any articles at all on witting a class that only supports one Async invocation. Every example I've seen assumes that a method call will be called more than once and thus, should have a userState object passed into the MethodNameAsync You'll see that MS makes mention of this in the third bullet point on this article http://msdn.microsoft.com/en-us/library/ms228974(VS.80).aspx under the "Simultaneously Executing Operations" heading. But I'm confused. Should I be using AsyncOperation and AsyncOperationManager classes to have asynchronous functionality where a method can only be called by one thread at a time? A link would also be nice :) Thanks

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• Artistic aspects of UI?

  - by anon

  Consider a single button. At one extreme, we have a black OpenGL window, with: outline (in white) of a rectangle bitmap remdered font inside of it, saying "Ok" At the other extreme, we have Mac OS X, a button that is: well rounded has some gradient showing light effects on it nice antialiased "OK" soft shadow of some sort These two UIs present very very different user experiences. The former says "This is from the 80s" the latter says "this is professional". This is something I do not understand well as a programmer (and don't know where to learn about this). Does anyone know of a good technical resource for this? [I'd prefer things that draws upon psychology / perception literature to say why to do something rather than design books that just says "use color XYZ with a gradient of blah"]

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• Splitting up/merging windows in WPF

  - by drasto

  I'm new to WPF but I need to implement following functionality: I have a window that contains one Grid (might be changed to stack panel or something else). In that Grid I have 2 columns, each of them contains another Grid. Lets call them gridFirst and gridSecond. There is also GridSplitter in first column allowing to resize the columns. I want to provide a button that will allow to separate gridFirst from this window and display it "as it is" in another window. How do I do that? It would be nice if the new window had a same menu as the original window without me having to copy-paste (that not a good coding practise) all its code to the new window. Thanks for answers

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• OSLO, ANTLR or other parser grammar, for parsing QUERY EXPRESSION

  - by Jay Allard

  Greetings I'm working on a project that requires me to write queries in text form, then convert them to some easily processed nodes to be processed by some abiguous repository. Of everything there, the part I'm least interested is the part that converts the text to nodes. I'm hoping it's already done somewhere. Because I'm making stuff up as I go, I chose to use a LINQish expression syntax. from m in Movie select m.A, m.B I started parsing it manually and got the basics, but it's pretty cheesy. I'm looking for the better solution. I made some progress using MGrammar, but it would be nice if such a thing already existed. Does anyone know of anything that already does this? I looked for existing ANTLR templates, but no luck. Thanks for the help.

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• Is there such a thing as a virtual COM port receipt printer?

  - by Blorgbeard

  I'm debugging some code that writes directly to a COM port in order to print receipts on a receipt printer. The printer model is something like an Epsom TM-88. Instead of printing reams of thermal paper while debugging this code, it would be nice if I could use some kind of virtual printer. Like PDFCreator or FinePrint, but with a virtual COM port instead of a virtual windows printer. Does anyone know of such a thing? Edit: The code sends control characters to get bold text and other formatting. I'd like to see this in the output if possible.

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• NSFetchedResultsController titleForHeaderInSection with formatted NSDate

  - by Daniel Granger

  In my Core Data app I am using a FetchedResultsController. Usually to set titles for headers in a UITableView you would implement the following method like so: - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { id <NSFetchedResultsSectionInfo> sectionInfo = [[<#Fetched results controller#> sections] objectAtIndex:section]; return [sectionInfo name]; } where [sectionInfo name] returns a NSString. my sectionKeyPath is based on an NSDate and this all works fine apart from the section headers it gives me are the raw date description strings (e.g. 12/12/2009 12:32:32 +0100) which look a bit of a mess in a header! So I want to use a date formatter on this to make a nice header like "Apr 17 2010" but I can't do that with the [sectionInfo name] as this is NSString! Any Ideas? Many Thanks

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• How to profile the execution of an OSGi deployment?

  - by Jaime Soriano

  I'm starting the development of an OSGi bundle for an application that will be deployed in a device with some hardware limitations. I'd like to know how could I profile the execution of that bundle to be always sure that it's going to fit with its dependencies in the final device. It would be nice to have a profiler to know how much memory is each bundle using, to localize bottle necks and to compare different implementations of the same service. Is there any profiler for OSGi deployments or should I use a general Java profiler? For developing I'm using Pax runner with Apache felix to run the bundle and maven to manage project dependencies and building.

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• Element binding in Silverlight

  - by Matt

  Where can I find some good documentation on data/element binding? My Google searches haven't turned much up. I had a custom class with two properties named Text and Value. When I tried binding a list to a listbox it wouldn't work. By chance I modifed my datatemplate from this <TextBox Text="{Binding Text}"></TextBox> to this <TextBox Text="{Binding Path=Text}"></TextBox> and then everything worked great. I need some indepth documenation/samples to data/element binding. I don't understand why some examples have the path set whereas others do not. A full explanation of this, and all other nice to know tips would be much appreciated.

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• How to properly rewrite ASSERT code to pass /analyze in msvc?

  - by Sorin Sbarnea

  Visual Studio added code analysis (/analyze) for C/C++ in order to help identify bad code. This is quite a nice feature but when you deal with and old project you may be overwhelmed by the number of warnings. Most of the problems are generating because the old code is doing some ASSERT at the beginning of the method or function. I think this is the ASSERT definition used in the code (from afx.h) #define ASSERT(f) DEBUG_ONLY((void) ((f) || !::AfxAssertFailedLine(THIS_FILE, __LINE__) || (AfxDebugBreak(), 0))) Example code: ASSERT(pBytes != NULL); *pBytes = 0; // <- warning C6011: Dereferencing NULL pointer 'pBytes' I'm looking for an easy and safe solution to solve these warnings that does not imply disabling these warnings. Did I mention that there are lots of occurrences in current codebase?

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• Good implementations of reinforced learning?

  - by Paperino

  For an ai-class project I need to implement a reinforcement learning algorithm which beats a simple game of tetris. The game is written in Java and we have the source code. I know the basics of reinforcement learning theory but was wondering if anyone in the SO community had hands on experience with this type of thing. What would your recommended readings be for an implementation of reinforced learning in a tetris game? Are there any good open source projects that accomplish similar things that would be worth checking out? Thanks in advanced Edit: The more specific the better, but general resources about the subject are welcomed. Follow up: Thought it would be nice if I posted a followup. Here's the solution (code and writeup) I ended up with for any future students :). Paper / Code

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• space around div with background image

  - by samoyed

  Hi to all, i'm trying to create a frame that will contain a dynamic amount of text. it has rounded corners so a created 3 divs:top, body and bottom. body will hold the content while top & bottom only display the respective images of the frame. all this can be seen here: http://www.m-challenge.com/nimrod/modular_frame.php the problem: there is a space those top and bottom divs and the middle one. please take a look and any input would be highly appreciated. have a nice day :-)

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• Sandbox solutions seem to be too severely crippled.

  - by Vaccano

  I am learning SharePoint and the different kind of solutions you can deploy. From the training I am watching it seems like you should try your best to use a Sandbox Solution when ever possible. This is because Farm Solutions can mess things up too much. However, two of the main things I would do with WebParts are not supported in Sandbox Solutions. Those are Visual WebParts and WebPart communication. (The first is not allowed because it needs to hit the file system and the second is disallowed because it uses reflection). It seems to me that my WebParts will always want to do at least one of those things. (WebParts that don't communicate are not really that modular are they?) Am I missing the point or are Sandbox Solutions a "nice idea" that are not really used in actual code?

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• Merge Microsoft Word documents with TortoiseSVN

  - by Álvaro G. Vicario

  TortoiseSVN has a nice VBA script that allows to merge Microsoft Word documents using Word builtin change tracking functionality. This way, when I merge changes from a branch into the trunk I can resolve the conflicts in Word documents. However, the feature is not as useful as it could because it doesn't track revision changes; it just compares the two documents as a whole. This way, when I merge a revision where one paragraph was added to the document I'm not offered to review this paragraph. Instead, I have to review all the differences between the source and target documents (including stuff like TOC bookmark names). Is it an inherent limitation I cannot override? Or is it due to the fact that my Word version is pretty old? (I'm using Word 2002). Also, if you know about a magic tool or plugin... ;-)

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• vlc python bindings - how to receive keyboard input?

  - by itsadok

  I'm trying to use VLC's python bindings to create my own little video player. The demo implementation is quite simple and nice, but it requires all the keyboard commands to be typed into the console from which the script was run. Is there any way I can handle keyboard input also when the video player itself has focus? Specifically, I care about controlling the video while in fullscreen mode. Perhaps there's a way to keep the keyboard focus in the console (or maybe another window) while showing the video? I'm using Windows XP, if that has any relevance.

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• Python: Why is IDLE so slow?

  - by Adam Matan

  Hi, IDLE is my favorite Python editor. It offers very nice and intuitive Python shell which is extremely useful for unit-testing and debugging, and a neat debugger. However, code executed under IDLE is insanely slow. By insanely I mean 3 orders of magnitude slow: bash time echo "for i in range(10000): print 'x'," | python Takes 0.052s, IDLE import datetime start=datetime.datetime.now() for i in range(10000): print 'x', end=datetime.datetime.now() print end-start Takes: >>> 0:01:44.853951 Which is roughly 2,000 times slower. Any thoughts, or ideas how to improve this? I guess it has something to do with the debugger in the background, but I'm not really sure. Adam

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• HOWTO and best working installation (MSI) chainer +/ bootstrapper

  - by davidovitz

  Hi, Our product has several products that customer can install created as separate installation packages (MSI). We have a requirement to have single package for the installation that will: Show one UI with progress Allow user to choose which features/packages to install Have ability to constrain one feature to another (e.g removing or adding effect other) Support single elevation (UAC) nice to have ability to auto update (not must) support command line + silent installation the package should be built out of the isolated installations (chain them) raise error / messages for missing prerequisites Support patches over time and major upgrades Today we do almost all of the above using MSI with nested installations which is bad practice and we face too many issues in our solution. i know that there are several bootstrappers out there (m$ generic bootstrapper which i think is not good, BURN is the WIX version which is not mature enough) Do you know of other? that work and tested already ? What is the best method to do (without unification of the MSI into a single MSI)

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• Ruby CMS/blog: Mephisto vs. Radiant

  - by Candidasa

  I'm looking for a blogging tool with some light CMS features in Ruby on Rails. I mainly want something simple, but configurable. I have no need for page snippets, etc. Just your basic main blog, very good (and easy) theme support, some nice sidebar stuff, a few static pages and MetaWeblog API support. I'm thinking of either using Mephisto or Radiant CMS (everything else seems half-baked or extremely lightweight at best): http://mephistoblog.com/ http://www.radiantcms.org/ Documentation for Mephisto seems very lacking and their site is a mess. I've also read some bad things about it's stability. Radiant seems more stable in comparison and has heaps of useful plug-ins. However, it isn't designed for blogging out of the box. That has to be added as almost an after thought. Creating a custom theme also seems more cumbersome with Radiant due to the sub-page/snippet feature. Which should I choose?

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• Who does non-decimal bignums with floating radix point?

  - by boost

  Nice as the Tcl libraries math::bignum and math::bigfloat are, the middle ground between the two needs to be addressed. Namely, bignums which are in different radices and have a radix point. At present math::bignum only handles integers (afaict) and math::bigfloat won't let you specify different radices to math::bigfloat::fromstr (ditto). Does anyone know of a library, for any of the major scripting languages (e.g. Tcl, Perl, Python, Ruby, Lua) or less major ones (newLISP for example), which implements bignums in different radices with handling for radix point?

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• Geodjango: importing data from OSGB_1936, displaying in WGS84?

  - by AP257

  I have some polygon data saved in a PostGIS database with projection SRID 27700. geom = models.MultiPolygonField(srid=27700) I want to display the shapes on OpenStreetMap, i.e. with SRID 900913 (I think?). So, two questions: How do I change the code below to output with the right SRID for OpenStreetMap? How can I change the Django code below to give me a nice json object, ready to display as a polygon? area = get_object_or_404(soa.objects, code=my_code) polygon = area.geom return render_to_response('area.html', { 'area': area }, context_instance = RequestContext(request)) Apologies if this question doesn't make sense - I'm pretty new to GeoDjango.

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• Creating a multiplayer card game

  - by Vikram.exe

  Hi, I was trying to make a multiplayer card game. I know networking concepts, so I know how to handle data between successive turns. I Haven't done a similar thing before so if any one could point me to a tutorial, that would be nice. I am comfortable with html/php/javascript and a bit of adobe flash. Please suggest are these sufficient to create a game or should I go for some other language(s)? Which are the best languages that are currently used to create such multiplayer games? Thanks, Vikram

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• [C#] SQLite - Creating and changing databases on the fly

  - by Oskar Kjellin

  Today I use SQLite and send a database-file with the project. However I want the database to be created when the user first starts the software. Is there a way to copy the code needed to create a database based on the existing database? The problem is that when a user downloads a new version he might be tricked into copying over his last database and lose the data. I'd like a nice way to check the version of the database and modify it if I need new columns or tables etc. Or, if it does not exist at all, create a new database? I know I can probably make create the code to make the database from the beginning but I want it to be based on the existing database I have created by a gui.

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• How (and where) to get aligned tRNA sequences (and import it into R)

  - by Tal Galili

  (This is a database / R commands question) I wish (for my thesis work), to import tRNA data into R and have it aligned. My questions are: 1) What resources can I use for the data. 2) What commands might help me with the import/alignment. So far, I found two nice repositories that holds such data: http://trnadb.bioinf.uni-leipzig.de/Resulthttp://trnadb.bioinf.uni-leipzig.de/Result http://gtrnadb.ucsc.edu/download.htmlhttp://gtrnadb.ucsc.edu/download.html And also the readFASTA command from Biostrings, that does basic importing of the data into R. My problem still remains with how to handle the alignment of the tRNA. Since I am not from the field, I might be missing a very basic answer (like where I should download the data from, or what command to use). If you might be willing to advice me, that would be most helpful. Many thanks in advance, Tal

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• Equivalents of Java and .NET technologies/frameworks

  - by Paul Sasik

  I work in a shop that is a mix of mostly Java and .NET technologists. When discussing new solutions and architectures we often encounter impedance in trying to compare the various technologies, frameworks, APIs etc. in use between the two camps. It seems that each camp knows little about the other and we end up comparing apples to oranges and forgetting about the bushels. While researching the topic I found this: Java -- .Net rough equivalents It's a nice list but it's not quite exhaustive and is missing the key .NET 3.0 technologies and a few other tidbits. To complete that list: what are the near/rough equivalents (or a combination of technologies) in Java to the following in .NET? WCF WPF Silverlight WF Generics Lambda expressions Linq (not Linq-to-SQL) TPL F# IronPython IronRuby ...have i missed anything else? Note that I omitted technologies that are already covered in the linked article. I would also like to hear feedback on whether the linked article is accurate. Thanks.

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