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• Computer science undergraduate project ideas

  - by Mehrdad Afshari

  Hopefully, I'm going to finish my undergraduate studies next semester and I'm thinking about the topic of my final project. And yes, I've read the questions with duplicate title. I'm asking this from a bit different viewpoint, so it's not an exact dupe. I've spent at least half of my life coding stuff in different languages and frameworks so I'm not looking at this project as a way to learn much about coding and preparing for real world apps or such. I've done lots of those already. But since I have to do it to complete my degree, I felt I should spend my time doing something useful instead of throwing the whole thing out. I'm planning to make it an open source project or a hosted Web app (depending on the type) if I can make a high quality thing out of it, so I decided to ask StackOverflow what could make a useful project. Situation I've plenty of freedom about the topic. They also require 30-40 pages of text describing the project. I have the following points in mind (the more satisfied, the better): Something useful for software development Something that benefits the community Having academic value is great Shouldn't take more than a month of development (I know I'm lazy). Shouldn't be related to advanced theoretical stuff (soft computing, fuzzy logic, neural networks, ...). I've been a business-oriented software developer. It should be software oriented. While I love hacking microcontrollers and other fun embedded electronic things, I'm not really good at soldering and things like that. I'm leaning toward a Web application (think StackOverflow, PasteBin, NerdDinner, things like those). Technology It's probably going to be done in .NET (C#, F#) and Windows platform. If I really like the project (cool low level hacking), I might actually slip to C/C++. But really, C# is what I'm efficient at. Ideas Programming language, parsing and compiler related stuff: Designing a domain specific programming language and compiler Templating language compiled to C# or IL Database tools and related code generation stuff Web related technologies: ASP.NET MVC View engine doing something cool (don't know what exactly...) Specific-purpose, small, fast ASP.NET-based Web framework Applications: Visual Studio plugin to integrate with Bazaar (it's too much work, I think). ASP.NET based, jQuery-powered issue tracker (and possibly, project lifecycle management as a whole - poor man's TFS) Others: Something related to GPGPU Looking forward for great ideas! Unfortunately, I can't help on a currently existing project. I need to start my own to prevent further problems (as it's an undergrad project, nevertheless).

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• regex return conditional group

  - by priyank.mp

  Hi , I spent lot time figuring out a simple regex to return a group (only 1st group). So the string can be - "No purchase required" or "Purchase of $50.00 worth groceries is required." I am trying to write a regex which can parse "No" or "50" based on the given string. This is what I have written. (?:(No) monthly maintenance|Purchase of \$([\d\.]+ worth groceries) This works fine but I want my output as 1st group/group 1 only.

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• Blackberry Menu from native blackberry application

  - by chrishawn

  I have an application that inserts an ApplicationMenuItem into the native blackberry contacts menu. I can get this to work just fine. Now my question is how would I change or remove that ApplicationMenuItem based on the contact that i am highlighted on? Would I need to use a GlobalEventListener? I assume overriding makeMenu can only be done for menus on my own screens and not the native contacts screen?

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• DataGridView.CellValueChanged not firing on bound DataGridView

  - by Wesley

  When I change a value programatically in a DataTable that my DataGridView is bound to, the appropriate CellValueChanged event is not firing for the DataGridView. I'm trying to change a cell's background color based on cell value when the DataTable is filled with data without iterating through every row and checking each value.

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• sync Framework for Compact Framework

  - by CF_Maintainer

  Has anyone got sync framework to work on a mobile device as a sync mechanism in place of RDA or Merge replication? If yes, could you point me to any resources available. If one was to start a green field compact framework based application, what would one use as the sync mechanism (sync framework/RDA/Merge replication/any other...)? Thanks

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• Creating WCF Services using Dynamic Languages and DLR

  - by Perpetualcoder

  I was curious how anyone would go about creating WCF based services using a dynamic language like IronPython or IronRuby. These languages do not have the concept of interfaces. How would someone define service contracts? Would we need to rely on static languages for such kind of tasks? I am a big fan of Python in particular and would like to know if this can be done at this point.

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• Integrating POP3 client functionality into a C# application?

  - by flesh

  I have a web application that requires a server based component to periodically access POP3 email boxes and retrieve emails. The service then needs to process the emails which will involve: Validating the email against some business rules (does it contain a valid reference in the subject line, which user sent the mail, etc.) Analysing and saving any attachments to disk Take the email body and attachment details and create a new item in the database Or update an existing item where the reference matches the incoming email subject line What is the best way to approach this? I really don't want to have to write a POP3 client from scratch, but I need to be able to customize the processing of emails. Ideally I would be able to plug in some component that does the access and retrieval for me, returning arrays of attachments, body text, subject line, etc. ready for my processing... [ UPDATE: Reviews ] OK, so I have spent a fair amount of time looking into (mainly free) .NET POP3 libraries so I thought I'd provide a short review of some of those mentioned below and a few others: Pop3.net - free - works OK, very basic in terms of functionality provided. This is pretty much just the POP3 commands and some base64 encoding, but it's very straight forward - probably a good introduction Pop3 Wizard - commercial / some open source code - couldn't get this to build, missing DLLs, I wouldn't bother with this C#Mail - free - works well, comes with Mime parser and SMTP client, however the comments are in Japanese (not a big deal) and it didn't work with SSL 'out of the box' - I had to change the SslStream constructor after which it worked no problem OpenPOP - free - hasn't been updated for about 5 years so it's current state is .NET 1.0, doesn't support SSL but that was no problem to resolve - I just replaced the existing stream with an SslStream and it worked. Comes with Mime parser. Of the free libraries, I'd go for C#Mail or OpenPOP. I looked at a few commercial libraries: Chillkat, Rebex, RemObjects, JMail.net. Based on features, price and impression of the company I would probably go for Rebex and may in the future if my requirements change or I run into production issues with either of C#Mail or OpenPOP. In case anyone's needs it, this is the replacement SslStream constructor that I used to enable SSL with C#Mail and OpenPOP: SslStream stream = new SslStream(clientSocket.GetStream(), false, delegate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors errors) { return true; });

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• C# - Kinetic scrolling with ListBox or ListView?

  - by fonix232

  I am doing a simple application for touch screen devices, and I would like to implement today's fashion: kinetic scrolling. Is it possible to do, and if yes, how? PS: Kinetic scrolling: A scrolling mechanism where you don't use a scrollbar to scroll the content, but you touch the list itself, and pull and push it. The "physics engine" then counts out the speed, and stops based on the given settings.

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• Throttling an AMQP Consumer Using RabbitMQ

  - by Nicholas

  I'm using AMQP in a reliability pattern and my use-case is to put messages in a queue, then consume them and insert the information into a web service. My web service is slow, and my queue can have many, many messages and I would like to ensure that the consumer doesn't kill my database. Is there a build-in way to perform throttling in RabbitMQ, either time-based(only X messages per minute/second/hour) or some other mechanism?

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• C# - Alternative to System.Timers.Timer, to call a function at a specific time.

  - by Fábio Antunes

  Hello everybody. I want to call a specific function on my C# application at a specific time. At first i thought about using a Timer (System.Time.Timer), but that soon became impossible to use. Why? Simple. The Timer Class requires a Interval in milliseconds, but considering that i might want the function to be executed, lets says in a week that would mean: 7 Days = 168 hours; 168 Hours = 10,080 minutes; 10,080 Minutes = 6,048,000 seconds; 6,048,000 Seconds = 6,048,000,000 milliseconds; So the Interval would be 6,048,000,000; Now lets remember that the Interval accepted data type is int, and as we know int range goes from -2,147,483,648 to 2,147,483,647. That makes Timer useless in this case once we cannot set a Interval bigger that 2,147,483,647 milliseconds. So i need a solution where i could specify when the function should be called. Something like this: solution.ExecuteAt = "30-04-2010 15:10:00"; solution.Function = "functionName"; solution.Start(); So when the System Time would reach "30-04-2010 15:10:00" the function would be executed in the application. How can this problem be solved? Thanks just by taking the time to read my question. But if you could provide me with some help i would be most grateful. Additional Info: What these functions will do? Getting climate information and based on that info: Starting / Shutting down other Applications (most of them Console Based); Sending custom Commands to those Console Applications; Power down, Rebooting, Sleep, Hibernate the computer; And if possible schedule the BIOS to Power Up the Computer; EDIT: It would seem that the Interval accepted data type is double, however if you set a value bigger that an int to the Interval, and call Start() it throws a exception [0, Int32.MaxValue]. EDIT 2: Jørn Schou-Rode suggested using Ncron to handle the scheduling tasks, and at first look this seems a good solution, but i would like to hear about some who as worked with it.

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• VBA to C# - Porting Userforms to Winforms?

  - by John M

  I am porting a Excel-VBA based app which uses Userforms over to a C# Winforms application. How do I convert the Height and Width of the VBA-Userform to the same screen dimensions in the C#-Winforms application? Is there a ratio that can use be used? Currently the VBA-Userform has a dimension of 179.25 W x 245.25 H which is optimized for use on a quarter-VGA device.

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• Hadoop Hive web interface options

  - by Garethr

  I've been experimenting with Hive for some data mining activities and would like to make it easily available to less command line orientated colleagues. Hive does now ship with a web interface (http://wiki.apache.org/hadoop/Hive/HiveWebInterface) but it's very basic at this stage. My question is does a visually polished and fully featured interface (either desktop or preferably web based) to Hive exist yet? Are their any open source efforts outside the Hive project working on this?

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• Qt static build with static mysql plugin confusion

  - by bdiloreto

  I have built a Qt application which uses the MySQL library, but I am confused by the documentation on static versus shared builds. From the Qt documentation at http://doc.qt.nokia.com/4.7/deployment-windows.html it says: To deploy plugin-based applications we should use the shared library approach. And on http://doc.qt.nokia.com/4.7/deployment.html, it says: Static linking results in a stand-alone executable. The advantage is that you will only have a few files to deploy. The disadvantages are that the executables are large and with no flexibility and that you cannot deploy plugins. To deploy plugin-based applications, you can use the shared library approach. But on http://doc.qt.nokia.com/latest/plugins-howto.html, it seems to say the opposite, giving directions on how to use static plugins: Plugins can be linked statically against your application. If you build the static version of Qt, this is the only option for including Qt's predefined plugins. Using static plugins makes the deployment less error-prone, but has the disadvantage that no functionality from plugins can be added without a complete rebuild and redistribution of the application. ... To link statically against those plugins, you need to use the Q_IMPORT_PLUGIN() macro in your application and you need to add the required plugins to your build using QTPLUGIN. I want to build the Qt libraries statically (for easy deployment) and then use the static MySQL plugin. To do this, I did NOT use the binary distrubtion for Windows. Instead, I've started with the source qt-everywhere-opensource-src-4.7.4 Is the following the correct way to do a static build so that i can use the static MySql plugin? configure -static -debug-and-release -opensource -platform win32-msvc2010 -no-qt3support -no-webkit -no-script -plugin-sql-mysql -I C:\MySQL\include -L C:\MySQL\lib This should build the Qt libraries statically AND the static plugin to be linked at run-time, correct? I would NOT need to build the Mysql Plugin from source separately, correct? If I was to subtitute "-qt-sql-mysql" for "-plugin-sql-mysql" in above, it would include the MySQL driver directly in the QT static libraries, in which case I would NOT need to use the plugin at all, correct? Thanks for making me unconfused!

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• Which MacBook(Pro) for running Visual Studio 2010 on VMWare Fusion on a Mac?

  - by Greg

  Hi Anyone have experience running Visual Studio 2010 on a MacBook or MacBook Pro? (via VMWare fusion) Any feedback / advice based on your experience re what level of MacBook Pro (i.e. CPU type, CPU speed) you would target to get reasonable/good performance from VS2010 on it? (I'm just concerned about getting a base level MacBook Pro 13" 2.4GHz Core2Duo whether I would be frustrated with performance or not)

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• dynamically setting the size of a textbox in a RDLC report

  - by SunsetKnight

  Can a textbox's width in a local RDLC report be set dynamically using C#? I would like to auto size the horizontal width of the text box based on the data it contains.

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• Textbox value to filter databound ListBox items using Javascript ?

  - by Ravikumar

  Hi Guys, I have a ListBox which is bound to a list of data items. Now I want the user to be able to filter the items shown in the ListBox based on the search expression typed in the TextBox. For each character typed in the TextBox, the ListBox items should change to show only the items matching the search expression. using Javascript ? regards ravi

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• C# vs Java Concurrency

  - by Lirik

  What are some notable differences between C# and Java concurrency? Are there any fundamental differences that we should know about? What should developers consider when trying to pick one or the other? I based my question on this one, but I'm more interested in the fundamental differences... not which one is better.

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• accessing a blob ; without using a webrole ?

  - by Egon

  I wanted to knw if there is way we can upload /download a blob; add remove view metadata without using a webrole ? If my application has a lot of gui, shud there be multiple webroles ? everywhere I see webrole's file default.aspx.cs has everything to do with the blob based on a event ; which is perfectly fine, but what if my gui is more complicated ?

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• UML assignment question

  - by waitinforatrain

  Hi guys, Sorry, I know this is a very lame question to ask and not of any use to anyone else. I have an assignment in UML due tomorrow and I don't even know the basics (all-nighter ahead!). I'm not looking for a walkthrough, I simply want your opinion on something. The assignment is as follows (you only need to skim over it!): ============= Gourmet Surprise (GS) is a small catering firm with five employees. During a typical weekend, GS caters fifteen events with twenty to fifty people each. The business has grown rapidly over the past year and the owner wants to install a new computer system for managing the ordering and buying process. GS has a set of ten standard menus. When potential customers call, the receptionist describes the menus to them. If the customer decides to book an event (dinner, lunch, picnic, finger food etc.), the receptionist records the customer information (e.g., name, address, phone number, etc.) and the information about the event (e.g., place, date, time, which one of the standard menus, total price) on a contract. The customer is then faxed a copy of the contract and must sign and return it along with a deposit (often a credit card or by check) before the event is officially booked. The remaining money is collected when the catering is delivered. Sometimes, the customer wants something special (e.g., birthday cake). In this case, the receptionist takes the information and gives it to the owner who determines the cost; the receptionist then calls the customer back with the price information. Sometimes the customer accepts the price, other times, the customer requests some changes that have to go back to the owner for a new cost estimate. Each week, the owner looks through the events scheduled for that weekend and orders the supplies (e.g., plates) and food (e.g., bread, chicken) needed to make them. The owner would like to use the system for marketing as well. It should be able to track how customers learned about GS, and identify repeat customers, so that GS can mail special offers to them. The owner also wants to track the events on which GS sent a contract, but the customer never signed the contract and actually booked a GS. Exercise: Create an activity diagram and a use case model (complete with a set of detail use case descriptions) for the above system. Produce an initial domain model (class diagram) based on these descriptions. Elaborate the use cases into sequence diagrams, and include any state diagrams necessary. Finally use the information from these dynamic models to expand the domain model into a full application model. ============= In your opinion, do you think this question is asking me to come up with a package for an online ordering system to replace the system described above, or to create UML diagrams that facilitate the existing telephone-based system?

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• Amazon SimpleDB for development environment / local installation.

  - by Kabeer

  Hello. Is there a way / tool to simulate Amazon's SimpleDB for the purpose of development? In my quest for above, I found this tool but this is for the Mac OS. Anything that can be installed on Win XP? Needless to say, all SimpleDB APIs need to be supported. Just in case it matters, mine is a .Net based web application.

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• Tetris Piece Rotation Algorithm

  - by coppercoder

  What are the best algorithms (and explanations) for representing and rotating the pieces of a tetris game? I always find the piece rotation and representation schemes confusing. Most tetris games seem to use a naive "remake the array of blocks" at each rotation: http://www.codeplex.com/Project/ProjectDirectory.aspx?ProjectSearchText=tetris However, some use pre-built encoded numbers and bit shifting to represent each piece: http://www.codeplex.com/wintris Is there a method to do this using mathematics (not sure that would work on a cell based board)?

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• Algorithm for heat map?

  - by eshan

  I have a list of values each with latitude and longitude. I'm looking to create a translucent heatmap image to overlay on Google Maps. I know there are server side and flash based solutions already, but I want to build this in javascript using the canvas tag. However, I can't seem to find a concise description of the algorithm used to turn coordinates and values into a heatmap. Can anyone provide or link to one? Thanks.

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• System.Json namespace missing from Windows Phone 7

  - by Freyday

  During a Mix10 presentation, the presenter (Charlie Kindel) said that when writing Silverlight based apps for WP7 you get all of Silverlight 3.0 with some of Silverlight 4.0 mixed in. Why then is System.Json missing? It was included in Silverlight 3.0, and is included in Silverlight 4.0. Windows Phone 7 Class Library Reference

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• Is there a PowerShell code formatter / pretty printer?

  - by Sleepless

  I'm looking for a source code beautifyer for PowerShell programs. Ideally, it would be CLI based, but any solution is acceptable. I would like to avoid configuring a generic pretty printer tool; I'd like a solution that works for PowerShell out of the box. Is there such a thing?

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• VS 2010 Coded UI Test - Launch Referenced Application

  - by Cory

  I'm using Visuial Studio's Coded UI Tests to run Automated UI tests on a WPF Application everytime a build runs on my TFS server. The problem I am running into is dynamically launching the executable based on the path where it was just built to, including the configuration(x86, x64). Is there any way to get the path to an executable in a referenced project so that I can launch the application dynamically from my test project?

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