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• Winforms MVP with Castle Windsor - DI for subforms?

  - by Paul Kirby

  I'm building a winforms app utilizing passive-view MVP and Castle Windsor as an IoC container. I'm still a little new to dependency injection and MVP, so I'm looking for some clarity... I have a main form which contains a number of user controls, and also will bring up other dialogs (ex. Login, options, etc) as needed. My first question is...should I use constructor injection to get the presenters for these other views into the main view, or should I go back to a Service Locator-type pattern? (which I've been told is a big nono!) Or something else? Second question...the user controls need to communicate back to the main form when they are "completed" (definition of that state varies based on the control). Is there a standard way of hooking these up? I was thinking perhaps just wiring up events between the main presenter and the child presenters, but I'm not sure if this is proper thinking. I'd appreciate any help, it seems that the combination of MVP and IoC in winforms isn't exactly well-documented.

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• How effective can this Tagging solution be?

  - by Pablo

  Im working on an image sharing site and want to implement tagging for the images. I've read Questions #20856 and #2504150 I have few concerns with the approach on the questions above. First of all it looks easy to link an image to a tag. However getting images by tag relation is not as easy. Not easy because you will have to get the image-to-tag relation from one table and then make a big query with a bunch of OR statements( one OR for every image). Before i even research the tagging topic i started testing the following method: This tables as examples: Table: Image Columns: ItemID, Title, Tags Table: Tag Columns: TagID, Name The Tags column in the Image table takes a string with multiple tagID from the Tag table enclosed by dashes(-). For example: -65-25-105- Links an image with the TagID 65,25 and 105. With this method i find it easier to get images by tag as i can get the TagID with one query and get all the images with another simple query like: SELECT * FROM Image WHERE Tags LIKE %-65-% So if i use this method for tagging, How effective this is? Is querying by LIKE %-65-% a slow process? What problems can i face in the future?

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• Is MEF an all-or-nothing affair?

  - by Dave

  I've had a few questions about MEF recently, but here's the big one -- is it really all-or-nothing, as it appears to be? My basic application structure is simply an app, several shared libraries that are intended to be singletons, and several different plugins (which may implement different interfaces). The app loads the plugins, and both the app and all plugins need to access the shared libraries. My first go at MEF was fairly successful, although I made some stupid mistakes along the way because I was trying so many different things, I just got confused at times. But in the end, last night I got my smallish test app running with MEF, some shared libraries, and one plugin. Now I'm moving onto the target app, which I already described. And it's the multiple plugins part that has be a bit worried. My existing application already supports multiple plugins with different interfaces by using Reflection. I need to be able to uniquely identify each plugin so that the user can select one and get the expected behavior exposed by that plugin. The problem is that I don't know how to do this yet... but that's the topic of a different question. Ideally, I'd be able to take my existing plugin loader and use it as-is, while relying on MEF to do the shared library resolution. The problem is, I can't seem to get MEF to load them (i.e. I get a CompositionException when calling ComposeParts()) unless I also use MEF to load the plugin. And if I do this, well... then I need to know how to keep track of them as they get loaded so the user can select one from a list of plugins. What have your experiences been with trying to mix and match these approaches?

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• Large scale storage for incrementally-appended documents?

  - by Ben Dilts

  I need to store hundreds of thousands (right now, potentially many millions) of documents that start out empty and are appended to frequently, but never updated otherwise or deleted. These documents are not interrelated in any way, and just need to be accessed by some unique ID. Read accesses are some subset of the document, which almost always starts midway through at some indexed location (e.g. "document #4324319, save #53 to the end"). These documents start very small, at several KB. They typically reach a final size around 500KB, but many reach 10MB or more. I'm currently using MySQL (InnoDB) to store these documents. Each of the incremental saves is just dumped into one big table with the document ID it belongs to, so reading part of a document looks like "select * from saves where document_id=14 and save_id 53 order by save_id", then manually concatenating it all together in code. Ideally, I'd like the storage solution to be easily horizontally scalable, with redundancy across servers (e.g. each document stored on at least 3 nodes) with easy recovery of crashed servers. I've looked at CouchDB and MongoDB as possible replacements for MySQL, but I'm not sure that either of them make a whole lot of sense for this particular application, though I'm open to being convinced. Any input on a good storage solution?

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• Retrieving varbinary output from a query in sql server into classic ASP

  - by user303526

  Hi, I'm trying to retrieve a varbinary output value from a query running on SQL Server 2005 into Classic ASP. The ASP execution just fails when it comes to part of code that is simply taking a varbinary output into a string. So I guess we gotta handle it some other way. Actually, I'm trying to set (sp_setapprole) and unset (sp_unsetapprole) application roles for a database connection. First I'd set the approle, then I'd run my required queries and finally unset the approle. During unsetting is when I need the cookie (varbinary) value in my ASP code so that I can create a query like 'exec sp_unsetapprole @cookie'. Well at this stage, I don't have the cookie (varbinary) value. The reason I'm doing this is I used to get 'sp_setapprole was not invoked correctly' error when trying to set app roles. I've disabled pooling by appending 'OLE DB Services = -2;Pooling=False' into my connection string. I know pooling helps performance wise but here I'm facing big problems. Please help me out to retrieve a varbinary value into an classic ASP file or suggest a way to set & unset app roles. Either way solutions are appreciated. Thanks, Nandagopal

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• Nested Routes and Parameters for Rails URLs (Best Practice)

  - by viatropos

  Hey there, I have a decent understanding of RESTful urls and all the theory behind not nesting urls, but I'm still not quite sure how this looks in an enterprise application, like something like Amazon, StackOverflow, or Google... Google has urls like this: http://code.google.com/apis/ajax/ http://code.google.com/apis/maps/documentation/staticmaps/ https://www.google.com/calendar/render?tab=mc Amazon like this: http://www.amazon.com/books-used-books-textbooks/b/ref=sa_menu_bo0?ie=UTF8&node=283155&pf_rd_p=328655101&pf_rd_s=left-nav-1&pf_rd_t=101&pf_rd_i=507846&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1PK4ZKN4YWJJ9B86ANC9 http://www.amazon.com/Ruby-Programming-Language-David-Flanagan/dp/0596516177/ref=sr_1_1?ie=UTF8&s=books&qid=1258755625&sr=1-1 And StackOverflow like this: http://stackoverflow.com/users/169992/viatropos http://stackoverflow.com/questions/tagged/html http://stackoverflow.com/questions/tagged?tagnames=html&sort=newest&pagesize=15 So my question is, what is best practice in terms of creating urls for systems like these? When do you start storing parameters in the url, when don't you? These big companies don't seem to be following the rules so hotly debated in the ruby community (that you should almost never nest URLs for example), so I'm wondering how you go about implementing your own urls in larger scale projects because it seems like the idea of not nesting urls breaks down at anything larger than a blog. Any tips?

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• WPF resource merged to Application.Resources but not resolved at runtime

  - by arconaut

  I have a brush that is part of a ResourceDictionary that is merged to Application.Resources. But for some reason it's not resolved at runtime when a style is being applied to one of the controls. However, if I call Application.Current.FindResource("BrushName") from the Immediate Window at the time when exception is thrown, the resource is found. Am I missing something? Isn't WPF supposed to try to look for the resource in the app's resources? UPDATE The application is quite big, so I can't post all actual code but here's the way the resources are merged and used: Brushes.xaml <ResourceDictionary ...> <SolidColorBrush x:Key="BrushName" Color="#12345678" /> <\ResourceDictionary> SomeStyles.xaml <ResourceDictionary ...> <Style x:Key="SomeStyle"> <Setter Property="SomeProperty" Value="{StaticResource BrushName}" /> </Style> </ResourceDictionary> App.xaml <Application ...> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Brushes.xaml" /> <ResourceDictionary Source="SomeStyles.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources> </Application ...> And then some control might use the style using the resource like this: ... Style={StaticResource SomeStyle} ...

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• Parsing XML with the PHP XMLReader

  - by coffeecoder

  Hi Guys, I am writing program that reads in some XML from the $_POST variable and then parses using the PHP XMLReader and the data extracted input into a database. I am using the XMLReader as the XML supplied will more than likely be too big to place into memory. However I am having some issues, my XML and basic code as are follows: '<?xml version="1.0"?> <data_root> <data> <info>value</info> </data> <action>value</action> </data_root>' $request = $_REQUEST['xml']; $reader = new XMLReader(); $reader->XML($request); while($reader->read()){ //processing code } $reader->close() My problem is that the code will work perfectly if the XML being passed does not have the <?xml version="1.0"?> line, but if i include it, and it will be included when the application goes into a live production environment, the $reader->read() code for the while loop does not work and the XML is not parsed within the while loop. Has anyone seen similar behaviour before or knows why this could be happening? Thanks in advance.

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• Rotate UIViewController to counteract changes in UIInterfaceOrientation

  - by Peter Hajas

  Hi there, I've been searching a lot on this, and can't find anything to help me. I have a UIViewController contained within another UIViewController. When the parent UIViewController rotates, say from Portrait to LandscapeLeft, I want to make it look as though the child didn't rotate. That is to say. I want the child to have the same orientation to the sky regardless of the parent's orientation. If it has a UIButton that's upright in Portrait, I want the right-side of the button to be "up" in UIInterfaceOrientationLandscapeLeft. Is this possible? Currently, I'm doing really gross stuff like this: -(void) rotate:(UIInterfaceOrientation)fromOrientation: toOr:(UIInterfaceOrientation)toOrientation { if(((fromOrientation == UIInterfaceOrientationPortrait) && (toOrientation == UIInterfaceOrientationLandscapeRight)) || ((fromOrientation == UIInterfaceOrientationPortraitUpsideDown) && (toOrientation == UIInterfaceOrientationLandscapeLeft))) { } if(((fromOrientation == UIInterfaceOrientationLandscapeRight) && (toOrientation == UIInterfaceOrientationPortraitUpsideDown)) || ((fromOrientation == UIInterfaceOrientationLandscapeLeft) && (toOrientation == UIInterfaceOrientationPortrait))) { } if(((fromOrientation == UIInterfaceOrientationPortrait) && (toOrientation == UIInterfaceOrientationLandscapeLeft)) || ((fromOrientation == UIInterfaceOrientationPortraitUpsideDown) && (toOrientation == UIInterfaceOrientationLandscapeRight))) { } if(((fromOrientation == UIInterfaceOrientationLandscapeLeft) && (toOrientation == UIInterfaceOrientationPortraitUpsideDown)) || ((fromOrientation == UIInterfaceOrientationLandscapeRight) && (toOrientation == UIInterfaceOrientationPortrait))) { } if(((fromOrientation == UIInterfaceOrientationPortrait) && (toOrientation == UIInterfaceOrientationPortraitUpsideDown)) || ((fromOrientation == UIInterfaceOrientationPortraitUpsideDown) && (toOrientation == UIInterfaceOrientationPortrait))) { } if(((fromOrientation == UIInterfaceOrientationLandscapeLeft) && (toOrientation == UIInterfaceOrientationLandscapeRight)) || ((fromOrientation == UIInterfaceOrientationLandscapeRight) && (toOrientation == UIInterfaceOrientationLandscapeLeft))) { } } which seems like a perfectly good waste of code. Furthermore, I was planning on using CGAffineTransform (like cited here: http://www.crystalminds.nl/?p=1102) but I'm confused about whether I should change the view's dimensions to match what they will be after the rotation. The big nightmare here is that you have to keep track of a global "orientation" variable. If you don't, the illusion is lost and the ViewController is rotated into whatever. I could really use some help on this, thanks!

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• Database structure - is mySQL the right choice?

  - by Industrial

  Hi everyone, We are currently planning the database structure of a quite complex e-commerce web app that has flexibility as it's main cornerstone. Our app features a large amount of data (products) and we have run into a slight headache trying to keep performance high without compromizing normalization rules in the database, or leaving our highly beloved flexibility concept behind when integrating product options (also widely known as product attributes or parameters). Based on various references and sources available, we have made up lists on pros and cons of all major and well known database patterns to solve this. After comparing these, we have come up with two final alternatives: EAV (Entity-attribute-value model) : Pros: Database is used for all sorting. Cons: All related queries will include a number of joins between multiple tables in order to complete the collection of data. SLOB (Serialized LOB, also known as Facade?) : Pros: Very flexible. Keeping the number of necessary joins low compared to a EAV design pattern. Easy to update/add/remove data from each product. Cons: All sorting will be done by the application instead of the database. Will use lots of performance (memory?) when big datasets is processed by a large number of users. Our main questions: Which pattern/structure would you use, or maybe even a different solution? Is there better databases besides mySQL available nowadays to accomplish what we want? Thanks a lot! Reference: http://stackoverflow.com/questions/695752/product-table-many-kinds-of-product-each-product-has-many-parameters

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• Decisions in teaching someone else to program: language selection

  - by Dinah

  My friend would like for me to guide her into learning programming. She's already proven enormous aptitude for thinking like a programmer but is scared of the idea of programming since in her mind it's relegated to some magical realm accessible only to smart people and trained computer scientists (ironically, I am neither but that's beside the point). My main question is the age-old and irritating question: which language should I chose? I've limited it down to these: PHP: dead simple to start with and I remember enough of the language to answer all novice questions. However, I can think of a million reasons why I wouldn't recommend this as a first language. The most diplomatic of which is that there's no desktop app option to which I would feel comfortable subjecting a novice. Python: supposed to be wonderful for beginners and generally everything I've heard about it screams that this is the correct choice. That's the problem: everything I've heard about it. I don't know it yet and have a lot of projects going on right now so I don't feel like learning it yet -- but I'm going to be the tech-support when any little thing goes wrong. I know there are tons of online resources but in the frustration of the moment, it's always going to be just me. C#: this is the language I'm most comfortable with so I know I can be good tech support. I also love this language and its versatility and community. The big drawback here is that I remember when I first learned it after doing mainly PHP, Perl, and JavaScript and I found the experience overwhelming. You are simultaneously learning: programming concepts, C# syntax, strong typing, OOP, and a complex powerful IDE with a bazillion options and buttons all over it.

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• SelectMany in Linq to entity

  - by Brazeta

  I was looking at some examples in microsoft site about linq and I see an example that I need to modify! http://msdn.microsoft.com/en-us/vcsharp/aa336758.aspx#SelectManyCompoundfrom3 public void Linq16() { List customers = GetCustomerList(); var orders = from c in customers from o in c.Orders where o.OrderDate >= new DateTime(1998, 1, 1) select new { c.CustomerID, o.OrderID, o.OrderDate }; ObjectDumper.Write(orders); } Insted of having a select that retrives the CustomerID, OrderID and OrderDate I want to select the CustomerID and a System.Collection.Generic.List that contains all the orders for that user! Essentially I want to group my orders by CustomerID, but i noticed that linq to entity does not allow a .ToList(object) inside the select. I want something like this... List customers = GetCustomerList(); var orders = from c in customers from o in c.Orders where o.OrderDate >= new DateTime(1998, 1, 1) select new xpto { TheCostumerID = c.CustomerID, CostumerOrders = o.Select(i=>i.OrderID).ToList(), }; ...but the .ToList() is a big problem, at least for me. I'm trying to find out the solution for that but so far I have acomplished nothing! Please help me.

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• To GAC, or not to GAC?

  - by Jagd

  I have a data access layer (DAL) that is written in ASP.NET 3.5 and uses the Microsoft patterns & practices libraries (hereafter referred to as P&P) in order to accomplish its data access. I installed P&P and it resides in my GAC, so, logically, my DAL references it in the GAC. Therefore, the P&P libraries are never pulled down to the bin folder of my DAL. I use this DAL project in at least five (more than that even, but I'm too lazy to try to count them all) different websites. And this has all worked just fine for me because I'm the only developer who works on these websites. But, now I have other developers who are going to work on some of these websites. The problem: if a developer pulls the DAL project down from our code repository, it won't build for them if they don't have the P&P libraries installed. My question: should I expect the developers to install the P&P libraries, or should I just dump them in the bin folder and be done with it? I realize that dumping them into the bin folder is probably the easiest way to deal with the problem, but I've never been a big fan of the bin folder if I can reference them in the GAC instead.

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• AndEngine VS Android's Canvas VS OpenGLES - For rendering a 2D indoor vector map

  - by Orchestrator

  This is a big issue for me I'm trying to figure out for a long time already. I'm working on an application that should include a 2D vector indoor map in it. The map will be drawn out from an .svg file that will specify all the data of the lines, curved lines (path) and rectangles that should be drawn. My main requirement from the map are Support touch events to detect where exactly the finger is touching. Great image quality especially when considering the drawings of curved and diagonal lines (anti-aliasing) Optional but very nice to have - Built in ability to zoom, pan and rotate. So far I tried AndEngine and Android's canvas. With AndEngine I had troubles with implementing anti-aliasing for rendering smooth diagonal lines or drawing curved lines, and as far as I understand, this is not an easy thing to implement in AndEngine. Though I have to mention that AndEngine's ability to zoom in and pan with the camera instead of modifying the objects on the screen was really nice to have. I also had some little experience with the built in Android's Canvas, mainly with viewing simple bitmaps, but I'm not sure if it supports all of these things, and especially if it would provide smooth results. Last but no least, there's the option of just plain OpenGLES 1 or 2, that as far as I understand, with enough work should be able to support all the features I require. However it seems like something that would be hard to implement. And I've never programmed in OpenGL or anything like it, but I'm willing very much to learn. To sum it all up, I need a platform that would provide me with the ability to do the 3 things I mentioned before, but also very important - To allow me to implement this feature as fast as possible. Any kind of answer or suggestion would be very much welcomed as I'm very eager to solve this problem! Thanks!

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• IE History Tracking, IFRAMES, and Cross Domain error...

  - by peiklk

  So here's the deal. We have a Flash application that is running within an HTML file. For one page we call a legacy reporting system in ASP.NET that is within an IFRAME. This page then communicates back to the Flash application using cross-domain scripting (document.domain = "domain" is set in both pages. THIS ALL WORKS. Now the kicker. Flash has history tracking enabled. This loads the history.js file that created a div tag to store page changes so the back and forward buttons work in the browser. Which works for Firefox and Chrome as they create a div tag. HOWEVER In Internet Explorer, history.js creates another IFRAME (instead of a DIV) called ie_historyFrame. When the ScriptResource.axd code attempts to access this with: var frameDoc = this._historyFrame.contentWindow.document; we get an "Access is Denied" error message. ARGH! We've tried getting a handle to this IFRAME and inserting the document.domain code. FAIL. We've tried editing the historytemplate.html file that flex also uses to include document.domain... FAIL. I've tried to edit the underlying ASP.NET page to disable history tracking in the ScriptManager control. FAIL. At my wit's end on this one. We have users who need to use IE to access this site. They are big clients who we cannot tell to just use Firefox. Any suggestions would be greatly appreciated.

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• Named pipe blocking with user nobody

  - by dnagirl

  I have 2 short scripts. The first, an awk script, processes a large file and prints to a named pipe 'myfifo.dat'. The second, a Perl script, runs a LOAD DATA LOCAL INFILE 'myfifo.dat'... command. Both of these scripts work when run locally like so: lee.awk big.file & lee.pl However, when I call these scripts from a PHP webpage, the named pipe blocks: $awk="/path/to/lee.awk {$_FILES['uploadfile']['tmp_name']} &"; $sql="/path/to/lee.pl"; if(!exec($awk,$return,$err)) throw new ZException(print_r($err,true)); //blocks here if(!exec($sql,$return,$err)) throw new ZException(print_r($err,true)); If I modify the awk and Perl scripts so that they write and read to a normal file, everything works fine from PHP. The permissions on the fifo and the normal file are 666 (for testing purposes). These operations run much more quickly through a named pipe, so I'd prefer to use one. Any ideas how to unblock it? ps. In case you're wondering why I'm going to all this aggravation, see this SO question.

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• split video (avi/h264) on keyframe

  - by m.sr

  Hallo. I have a big video file. ffmpeg, tcprobe and other tool say, it is an h264-stream in an AVI-container. Now i'd like to cut out small chunks form the video. Problem: The index of the video seam corrupted/destroyed. I kind of fixed this via mplayer -forceidx -saveidx <IndexFile> <BigVideoFile>. The Problem here is, that I'm now stuck with mplayer/mencoder which can use this index file via -loadidx <IndexFile>. I have tried correcting the index like described in man aviindex (mplayer -frames 0 -saveidx mpidx broken.avi ; aviindex -i mpidx -o tcindex ; avimerge -x tcindex -i broken.avi -o fixed.avi), but this didn't fix my video - meaning that most tools i've tested couldn't search in the video file. Problem: I sut out parts of the video via following command: mencoder -loadidx in.idx -ss 8578 -endpos 20 -oac faac -ovc x264 -sws 9 -lavfopts format=mp4 -x264encopts <LotsOfOpts> -of lavf -vf scale=800:-10,harddup in.avi -o out.mp4. Now here the problem is, that some videos are corrupted at the beginning. I think this is because the fact, that i do not necessarily cut at keyframe. Questions: What is the best way to fix the index of an avi "inline" so that every tool can again work as expected with it? How can i split at the keyframes? Is there an mencoder-option for this? Are Keyframes coming in a frequency? How to find out this frequency? (So with a bit of math it should be possible to calculate the next keyframe and cut there) Is ther perhaps some completely other way to split this movie? Doing it by hand is no option, i've to cut out 1000+ chunks ... Thanks a lot!

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• Database structure and source control - best practice

  - by Paddy

  Background I came from several years working in a company where all the database objects were stored in source control, one file per object. We had a list of all the objects that was maintained when new items were added (to allow us to have scripts run in order and handle dependencies) and a VB script that ran to create one big script for running against the database. All the tables were 'create if not exists' and all the SP's etc. were drop and recreate. Up to the present and I am now working in a place where the database is the master and there is no source control for DB objects, but we do use redgate's tools for updating our production database (SQL compare), which is very handy, and requires little work. Question How do you handle your DB objects? I like to have them under source control (and, as we're using GIT, I'd like to be able to handle merge conflicts in the scripts, rather than the DB), but I'm going to be pressed to get past the ease of using SQL compare to update the database. I don't really want to have us updating scripts in GIT and then using SQL compare to update the production database from our DEV DB, as I'd rather have 'one version of the truth', but I don't really want to get into re-writing a custom bit of software to bundle the whole lot of scripts together. I think that visual studio database edition may do something similar to this, but I'm not sure if we will have the budget for it. I'm sure that this has been asked to death, but I can't find anything that seems to quite have the answer I'm looking for. Similar to this, but not quite the same: http://stackoverflow.com/questions/340614/what-are-the-best-practices-for-database-scripts-under-code-control

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• ASP.NET MVC, Url Routing: Maximum Path (URL) Length

  - by Martin Aatmaa

  The Scenario I have an application where we took the good old query string URL structure: ?x=1&y=2&z=3&a=4&b=5&c=6 and changed it into a path structure: /x/1/y/2/z/3/a/4/b/5/c/6 We're using ASP.NET MVC and (naturally) ASP.NET routing. The Problem The problem is that our parameters are dynamic, and there is (theoretically) no limit to the amount of parameters that we need to accommodate for. This is all fine until we got hit by the following train: HTTP Error 400.0 - Bad Request ASP.NET detected invalid characters in the URL. IIS would throw this error when our URL got past a certain length. The Nitty Gritty Here's what we found out: This is not an IIS problem IIS does have a max path length limit, but the above error is not this. Learn dot iis dot net How to Use Request Filtering Section "Filter Based on Request Limits" If the path was too long for IIS, it would throw a 404.14, not a 400.0. Besides, the IIS max path (and query) length are configurable: <requestLimits maxAllowedContentLength="30000000" maxUrl="260" maxQueryString="25" /> This is an ASP.NET Problem After some poking around: IIS Forums Thread: ASP.NET 2.0 maximum URL length? http://forums.iis.net/t/1105360.aspx it turns out that this is an ASP.NET (well, .NET really) problem. The shit of the matter is that, as far as I can tell, ASP.NET cannot handle paths longer than 260 characters. The nail in the coffin in that this is confirmed by Phil the Haack himself: Stack Overflow ASP.NET url MAX_PATH limit Question ID 265251 The Question So what's the question? The question is, how big of a limitation is this? For my app, it's a deal killer. For most apps, it's probably a non-issue. What about disclosure? No where where ASP.NET Routing is mentioned have I ever heard a peep about this limitation. The fact that ASP.NET MVC uses ASP.NET routing makes the impact of this even bigger. What do you think?

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• overriding enumeration base type using pragma or code change

  - by vprajan

  Problem: I am using a big C/C++ code base which works on gcc & visual studio compilers where enum base type is by default 32-bit(integer type). This code also has lots of inline + embedded assembly which treats enum as integer type and enum data is used as 32-bit flags in many cases. When compiled this code with realview ARM RVCT 2.2 compiler, we started getting many issues since realview compiler decides enum base type automatically based on the value an enum is set to. http://www.keil.com/support/man/docs/armccref/armccref_Babjddhe.htm For example, Consider the below enum, enum Scale { TimesOne, //0 TimesTwo, //1 TimesFour, //2 TimesEight, //3 }; This enum is used as a 32-bit flag. but compiler optimizes it to unsigned char type for this enum. Using --enum_is_int compiler option is not a good solution for our case, since it converts all the enum's to 32-bit which will break interaction with any external code compiled without --enum_is_int. This is warning i found in RVCT compilers & Library guide, The --enum_is_int option is not recommended for general use and is not required for ISO-compatible source. Code compiled with this option is not compliant with the ABI for the ARM Architecture (base standard) [BSABI], and incorrect use might result in a failure at runtime. This option is not supported by the C++ libraries. Question How to convert all enum's base type (by hand-coded changes) to use 32-bit without affecting value ordering? enum Scale { TimesOne=0x00000000, TimesTwo, // 0x00000001 TimesFour, // 0x00000002 TimesEight, //0x00000003 }; I tried the above change. But compiler optimizes this also for our bad luck. :( There is some syntax in .NET like enum Scale: int Is this a ISO C++ standard and ARM compiler lacks it? There is no #pragma to control this enum in ARM RVCT 2.2 compiler. Is there any hidden pragma available ?

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• CQRS - The query side

  - by mattcodes

  A lot of the blogsphere articles related to CQRS (command query repsonsibility) seperation seem to imply that all screens/viewmodels are flat. e.g. Name, Age, Location Of Birth etc.. and thus the suggestion that implementation wise we stick them into fast read source etc.. single table per view mySQL etc.. and pull them out with something like primitive SqlDataReader, kick that nasty nhibernate ORM etc.. However, whilst I agree that domain models dont mapped well to most screens, many of the screens that I work with are more dimensional, and Im sure this is pretty common in LOB apps. So my question is how are people handling screen where by for example it displays a summary of customer details and then a list of their orders with a [more detail] link etc.... I thought about keeping with the straight forward SQL query to the Query Database breaking off the outer join so can build a suitable ViewModel to View but it seems like overkill? Alternatively (this is starting to feel yuck) in CustomerSummaryView table have a text/big (whatever the type is in your DB) column called Orders, and the columns for the Order summary screen grid are seperated by , and rows by |. Even with XML datatype it still feeel dirty. Any thoughts on an optimal practice?

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• HttpWebRequest: The request was aborted: The request was canceled.

  - by Emeka

  I've been working on developing a middle man application of sorts, which uploads text to a CMS backend using HTTP post requests for a series of dates (usually 7 at a time). I am using HttpWebRequest to accomplish this. It seems to work fine for the first date, but when it starts the second date I get the System.Net.WebException: The request was aborted: The request was canceled. I've searched around and found the following big clues: http://social.msdn.microsoft.com/Forums/en-US/netfxnetcom/thread/0d0afe40-c62a-4089-9d8b-fb4d206434dc http://www.jaxidian.org/update/2007/05/05/8 http://arnosoftwaredev.blogspot.com/2006/09/net-20-httpwebrequestkeepalive-and.html And they haven't been too helpful. I've tried overloading the GetWebReuqest but that doesn't make sense because I don't make any use of that function. Here is my code: http://pastebin.org/115268 I get the error on line 245 after it has run successfully at least once. I'd appreciate any help I can get as this is the last step in a project I've been working on for sometime. This is my first C#/VS project so I'm open to any tips but I would like to focus on getting this problem solved first. THanks!

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• Double type returns -1.#IND/NaN error when calculating pi iteratively

  - by Draak

  I am working through a problem for my MCTS certification. The program has to calculate pi until the user presses a key, at which point the thread is aborted, the result returned to the main thread and printed in the console. Simple enough, right? This exercise is really meant to be about threading, but I'm running into another problem. The procedure that calculates pi returns -1.#IND. I've read some of the material on the web about this error, but I'm still not sure how to fix it. When I change double to Decimal type, I unsurprisingly get Overflow Exception very quickly. So, the question is how do I store the numbers correctly? Do I have to create a class to somehow store parts of the number when it gets too big to be contained in a Decimal? Class PiCalculator Dim a As Double = 1 Dim b As Double = 1 / Math.Sqrt(2) Dim t As Double = 1 / 4 Dim p As Double = 1 Dim pi As Double Dim callback As DelegateResult Sub New(ByVal _callback As DelegateResult) callback = _callback End Sub Sub Calculate() Try Do While True Dim a1 = (a + b) / 2 Dim b1 = Math.Sqrt(a * b) Dim t1 = t - p * (a - a1) ^ 2 Dim p1 = 2 * p a = a1 b = b1 t = t1 p = p1 pi = ((a + b) ^ 2) / (4 * t) Loop Catch ex As ThreadAbortException Finally callback(pi) End Try End Sub End Class

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• How should I handle persistence in a Java MUD? OptimisticLockException handling

  - by Chase

  I'm re-implementing a old BBS MUD game in Java with permission from the original developers. Currently I'm using Java EE 6 with EJB Session facades for the game logic and JPA for the persistence. A big reason I picked session beans is JTA. I'm more experienced with web apps in which if you get an OptimisticLockException you just catch it and tell the user their data is stale and they need to re-apply/re-submit. Responding with "try again" all the time in a multi-user game would make for a horrible experience. Given that I'd expect several people to be targeting a single monster during a fight I think the chance of an OptimisticLockException would be high. My view code, the part presenting a telnet CLI, is the EJB client. Should I be catching the PersistenceExceptions and TransactionRolledbackLocalExceptions and just retrying? How do you decide when to stop? Should I switch to pessimistic locking? Is persisting after every user command overkill? Should I be loading the entire world in RAM and dumping the state every couple of minutes? Do I make my session facade a EJB 3.1 singleton which would function as a choke point and therefore eliminating the need to do any type of JPA locking? EJB 3.1 singletons function as a multiple reader/single writer design (you annotate the methods as readers and writers). Basically, what is the best design and java persistence API for highly concurrent data changes in an application where it is not acceptable to present resubmit/retry prompts to the user?

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• Scope of Connection Object for a Website using Connection Pooling (Local or Instance)

  - by Danny

  For a web application with connection polling enabled, is it better to work with a locally scoped connection object or instance scoped connection object. I know there is probably not a big performance improvement between the two (because of the pooling) but would you say that one follows a better pattern than the other. Thanks ;) public class MyServlet extends HttpServlet { DataSource ds; public void init() throws ServletException { ds = (DataSource) getServletContext().getAttribute("DBCPool"); } protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException { SomeWork("SELECT * FROM A"); SomeWork("SELECT * FROM B"); } void SomeWork(String sql) { Connection conn = null; try { conn = ds.getConnection(); // execute some sql ..... } finally { if(conn != null) { conn.close(); // return to pool } } } } Or public class MyServlet extends HttpServlet { DataSource ds; Connection conn;* public void init() throws ServletException { ds = (DataSource) getServletContext().getAttribute("DBCPool"); } protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException { try { conn = ds.getConnection(); SomeWork("SELECT * FROM A"); SomeWork("SELECT * FROM B"); } finally { if(conn != null) { conn.close(); // return to pool } } } void SomeWork(String sql) { // execute some sql ..... } }

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