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  • What is the worst real-world macros/pre-processor abuse you've ever come across?

    - by Trevor Boyd Smith
    What is the worst real-world macros/pre-processor abuse you've ever come across (please no contrived IOCCC answers *haha*)? Please add a short snippet or story if it is really entertaining. The goal is to teach something instead of always telling people "never use macros". p.s.: I've used macros before... but usually I get rid of them eventually when I have a "real" solution (even if the real solution is inlined so it becomes similar to a macro). Bonus: Give an example where the macro was really was better than a not-macro solution. Related question: When are C++ macros beneficial?

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  • Uninstall Rails 3 with dependencies?

    - by Trevor Burnham
    I like that Rails 3 is so easy to install: gem install rails --pre, and all of the dependencies are automatically installed for you. But, what about uninstalling it? If I just do gem uninstall rails, I still have actionmailer (3.0.0.beta3) actionpack (3.0.0.beta3) activemodel (3.0.0.beta3) activerecord (3.0.0.beta3) activeresource (3.0.0.beta3) activesupport (3.0.0.beta3) which I want to get rid of. What's the easiest way to do so?

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  • Javascript how can I trigger an event that was prevented

    - by Mike Robinson
    In my app a user clicks a link to another page. I'd like to track that in Omniture with a custom event, so I've bound the omniture s.t() event to the click event. How can I make certain the event fires before the next page is requested? I've considered event.preventDefault() on the click event of the link, but I actually want the original event to occur, just not immediately.

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  • LINQ .Cast() extension method fails but (type)object works.

    - by Ben Robinson
    To convert between some LINQ to SQL objects and DTOs we have created explicit cast operators on the DTOs. That way we can do the following: DTOType MyDTO = (LinqToSQLType)MyLinq2SQLObj; This works well. However when you try to cast using the LINQ .Cast() extension method it trows an invalid cast exception saying cannot cast type Linq2SQLType to type DTOType. i.e. the below does not work List<DTO.Name> Names = dbContact.tNames.Cast<DTO.Name>() .ToList(); But the below works fine: DAL.tName MyDalName = new DAL.tName(); DTO.Name MyDTOName = (DTO.Name)MyDalName; and the below also works fine List<DTO.Name> Names = dbContact.tNames.Select(name => (DTO.Name)name) .ToList(); Why does the .Cast() extension method throw an invalid cast exception? I have used the .Cast() extension method in this way many times in the past and when you are casting something like a base type to a derived type it works fine, but falls over when the object has an explicit cast operator.

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  • Performance hit from C++ style casts?

    - by Trevor Boyd Smith
    I am new to C++ style casts and I am worried that using C++ style casts will ruin the performance of my application because I have a real-time-critical deadline in my interrupt-service-routine. I heard that some casts will even throw exceptions! I would like to use the C++ style casts because it would make my code more "robust". However, if there is any performance hit then I will probably not use C++ style casts and will instead spend more time testing the code that uses C-style casts. Has anyone done any rigorous testing/profiling to compare the performance of C++ style casts to C style casts? What were your results? What conclusions did you draw?

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  • Is there any way to group edit buttons in MediaWiki?

    - by Mark Robinson
    Is there any way to group the edit buttons displayed above the edit dialog in MediaWiki? By grouping, I mean like Word does (and even this editor) - you can add dividing lines to group them so that e.g. Bold and Italic are in one group, numbered list and bullet points in another. We've added lots of new buttons (in EditPage.php) and they are in a logical order, but at 30 buttons it is a bit overwhelming for some users.

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  • How to stop listening on an HTTP::Daemon port in Perl

    - by Trevor
    I have a basic perl HTTP server using HTTP::Daemon. When I stop and start the script, it appears that the port is still being listened on and I get an error message saying that my HTTP::Daemon instance is undefined. If I try to start the script about a minute after it has stopped, it works fine and can bind to the port again. Is there any way to stop listening on the port when the program terminates instead of having to wait for it to timeout? use HTTP::Daemon; use HTTP::Status; my $d = new HTTP::Daemon(LocalAddr => 'localhost', LocalPort => 8000); while (my $c = $d->accept) { while (my $r = $c->get_request) { $c->send_error(RC_FORBIDDEN) } $c->close; undef($c); }

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  • SQLite problem with some parameterized queries

    - by Trevor Balcom
    I am having some trouble using SQLite and parameterized queries with a few tables. I have noticed some queries using the "SELECT * FROM Table WHERE row=?" are returning 1 row when there should be more rows returned. If I change the parameterized query to "SELECT * FROM Table WHERE row='row'" then the correct number of rows is returned. Does anyone know why sqlite3_step would return only 1 row when using a parameterized query vs. using the same query in a traditional non-parameterized way? I am using a very thin C++ wrapper around SQLite3. I suspect there could be a problem with the wrapper, but this problem only exists on a few tables. It makes me wonder if there is something wrong with the way those tables are setup. Any advice is appreciated.

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  • Math.min.apply(0, x) - why?

    - by Trevor Burnham
    I was just digging through some JavaScript code (Raphaël.js) and came across the following line (translated slightly): Math.min.apply(0, x) where x is an array. Why on earth would you do this? The behavior seems to be "take the min from the array x."

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  • What are the pitfalls to watch out for when upgrading MediaWiki?

    - by Mark Robinson
    We've got MediaWiki 1.13.2 and we'll soon be upgrading to the latest & greatest version (probably 1.16). We've got lots of extensions installed (for which we'll probably also need to get the latest versions) and we've done some minor configuring (e.g. adding new edit buttons). What should we watch out for during the upgrade? And what should we test? Does anyone have any experience of things that went wrong?

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  • Using variables for colors in table cells

    - by Mark Robinson
    Using the variables extension, I want to change the background color of a cell in a table. So far I've done this: {{#vardefine:green|<span style="background:Green; color:White">text</span>}} The problem is that, when I add {{#var:green}} to the cell, only the text itself has a green background. Ideally, I want the whole cell to have a background color, like it does if I use this: | bgcolor="#ff00ff" | test or this | style="background:silver" |silver in the cell. Does anyone know how to solve this?

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  • Undefined method 'total_entries' after upgrading Rails 2.2.2 to 2.3.5

    - by Trevor
    I am upgrading a Rails application from 2.2.2 to 2.3.5. The only remaining error is when I invoke total_entries for creating a jqgrid. Error: NoMethodError (undefined method `total_entries' for #<Array:0xbbe9ab0>) Code snippet: @route = Route.find( :all, :conditions => "id in (#{params[:id]})" ) { if params[:page].present? then paginate :page => params[:page], :per_page => params[:rows] order_by "#{params[:sidx]} #{params[:sord]}" end } respond_to do |format| format.html # show.html.erb format.xml { render :xml => @route } format.json { render :json => @route } format.jgrid { render :json => @route.to_jqgrid_json( [ :id, :name ], params[:page], params[:rows], @route.total_entries ) } end Any ideas? Thanks!

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  • How to Transfer Large File from MS Word Add-In (VBA) to Web Server?

    - by Ian Robinson
    Overview I have a Microsoft Word Add-In, written in VBA (Visual Basic for Applications), that compresses a document and all of it's related contents (embedded media) into a zip archive. After creating the zip archive it then turns the file into a byte array and posts it to an ASMX web service. This mostly works. Issues The main issue I have is transferring large files to the web site. I can successfully upload a file that is around 40MB, but not one that is 140MB (timeout/general failure). A secondary issue is that building the byte array in the VBScript Word Add-In can fail by running out of memory on the client machine if the zip archive is too large. Potential Solutions I am considering the following options and am looking for feedback on either option or any other suggestions. Option One Opening a file stream on the client (MS Word VBA) and reading one "chunk" at a time and transmitting to ASMX web service which assembles the "chunks" into a file on the server. This has the benefit of not adding any additional dependencies or components to the application, I would only be modifying existing functionality. (Fewer dependencies is better as this solution should work in a variety of server environments and be relatively easy to set up.) Question: Are there examples of doing this or any recommended techniques (either on the client in VBA or in the web service in C#/VB.NET)? Option Two I understand WCF may provide a solution to the issue of transferring large files by "chunking" or streaming data. However, I am not very familiar with WCF, and am not sure what exactly it is capable of or if I can communicate with a WCF service from VBA. This has the downside of adding another dependency (.NET 3.0). But if using WCF is definitely a better solution I may not mind taking that dependency. Questions: Does WCF reliably support large file transfers of this nature? If so, what does this involve? Any resources or examples? Are you able to call a WCF service from VBA? Any examples?

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  • Html.EditorFor Global Template?

    - by Grant Trevor
    Is there any way to define a global template for the Html.EditorFor helper? I would like to alter the markup that is output so that for example instead of rendering <div class="editor-label"> <label .../> </div> <div class="editor-field"> <input .../> </div> It would render: <div> <div class="label"><label..../></div> <div class="field"><input..../></div> </div> This is for when I'm using Html.EditorFor with an object instance not just an object property.

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  • XPath selection from path in XML content

    - by Wayne Robinson
    I have the following XML: <root> <name>The name</name> <long> <path> <value>Some Value</value> </path> </long> <field>/root/name</field> <field>/root/long/path/value</field> </root> and I want to select these paths in the field tags however, when I try the following: <xsl:value-of select="/root/field[1]" /> all I get is the text value of the field. Is there a way of selecting the correct node from those values?

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  • Can I use RVM to maintain a single version of Ruby for all users?

    - by Trevor Burnham
    I love RVM. I realize that the main use case for it is letting different users switch between different versions of Ruby. But let's say I'm deploying a Rails app to a server and I just want a single version of Ruby running. In particular, I want 1.9.2, which is a breeze to install with RVM but a pain without it. Is there a way that I can say "I want this to be the canonical Ruby installation for all users" (along with all of its gems) without having to create a bunch of symlinks by hand and change them every time I update to a newer Ruby release?

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  • How do you pull the URL for an ASP.NET web reference from a configuration file in Visual Studio 2008

    - by Ian Robinson
    I have a web reference for our report server embedded in our application. The server that the reports live on could change though, and I'd like to be able to change it "on the fly" if necessary. I know I've done this before, but can't seem to remember how. Thanks for your help. update - I've manually driven around this for the time being. It's not a big deal to set the URL in the code, but I'd like to figure out what the "proper" way of doing this in VS 2008 is. Could anyone provide any further insights? Thanks!

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  • Should I Split Tables Relevant to X Module Into Different DB? Mysql

    - by Michael Robinson
    I've inherited a rather large and somewhat messy codebase, and have been tasked with making it faster, less noodly and generally better. Currently we use one big database to hold all data for all aspects of the site. As we need to plan for significant growth in the future, I'm considering splitting tables relevant to specific sections of the site into different databases, so if/when one gets too large for one server I can more easily migrate some user data to different mysql servers while retaining overall integrity. I would still need to use joins on some tables across the new databases. Is this a normal thing to do? Would I incur a performance hit because of this?

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  • What stackoverflow questions bring out the best in you? [closed]

    - by Mark Robinson
    This question is to help me (us) ask better questions of this community to encourage better working together. What questions here bring out the best in you? I don't mean which are the best / most appropriate questions but which bring the best out of you? That is, it brings out your best thinking and most constructive behaviour. Consider, for example, questions that make you think or that are asked in a certain way. Or consider specific a question should be. Or more abstractly, questions asked on a certain day / time, ... So I'm not necessarily asking about specific subjects but rather how a question is asked. What inspires you to drop everything and start answering? This comes from my observing questions that get highest points - I’m graduating with a Computer Science degree but I don’t feel like I know how to program. is very positive but my first ever question caused a minor storm. Ironically, I'm nervous posting this question so please don't attack if this is inappropriate.

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