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• Calling C function from DTrace scripts

  - by dmeister

  DTrace is impressive, powerful tracing system originally from Solaris, but it is ported to FreeBSD and Mac OSX. DTrace uses a high-level language called D not unlike AWK or C. Here is an example: io:::start /pid == $1/ { printf("file %s offset %d size %d block %llu\n", args[2]->fi_pathname, args[2]->fi_offset, args[0]->b_bcount, args[0]->b_blkno); } Using the command line sudo dtrace -q -s <name>.d <pid> all IOs originated from that process are logged. My question is if and how it is possible to call custom C functions from a DTrace script to do advanced operations with that tracing data during the tracing itself.

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• Custom Types in WCF Rest

  - by user316341

  I am using the Rest Singleton WCF Service temple from the Rest Starter Kit. The temples uses sample item as its sample Item. i am attempting to replace that sample ITem with a custom type from web reference in my ASP.Net project .dll. The types and name spaces are found and i can replace the sample item in the code. when i run the application i get this error: "Exception has been thrown by the target of an invocation." when this line is executed "return new SingletonServiceHost(serviceType, baseAddresses);" <%@ ServiceHost Language="C#" Debug="true" Service="SAUDServices.Service" Factory="SAUDServices.AppServiceHostFactory"%> using System; using System.ServiceModel; using System.ServiceModel.Activation; using Microsoft.ServiceModel.Web.SpecializedServices; using Stretchatyourdesk; namespace SAUDServices { class AppServiceHostFactory : ServiceHostFactory { protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses) { return new SingletonServiceHost(serviceType, baseAddresses); } } }

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• In VB.NET how do you specify Inherits/implements on a generic class with multi-constraints

  - by Romel Evans

  When I write the following statement in VB.Net (C# is my normal language), I get an "end of statement expected" referring to the "Implements" statement. <Serializable()> _ <XmlSchemaProvider("EtgSchema")> _ Public Class SerializeableEntity(Of T As {Class, ISerializable, New}) _ Implements IXmlSerializable, ISerializable ... End Class The C# version that I'm trying to emulate is: [Serializable] [XmlSchemaProvider("MySchema")] public class SerializableEntity<T> : IXmlSerializable, ISerializable where T : class, new() { .... } Sometimes I feel like I have 5 thumbs with VB.NET :)

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• Is Haskell "mainstream", or is it mainly used by hobbyists and academics?

  - by Asher

  I came across a post where someone wrote something inaccurate about Haskell (won't go into it) and he got flammed for it. Which (pleasantly) surprised me. About 3 years ago I read this joke about Haskell: All the haskell programmers in the world can fit into a 747 and if that plane were to crash no one would care... or something along those lines. Which brings me to my question: how healthy is the Haskell community, anyway? Is Haskell "mainstream"? Is it mainly used by hobbiest and academics or someone making some serious money from it (which is the true yardstick of how good a language is - just kidding, geez!)?

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• Problem creating PostGIS template database

  - by omat

  I am trying to build a template geographic database for PostGIS (1.5) on Mac OS X Snow Leopard (10.6) for my GeoDjango application. I am following: http://docs.djangoproject.com/en/dev/ref/contrib/gis/install/#creating-a-spatial-database-template-for-postgis I've managed to come up to the point where the provided postgis.sql should be run (i.e. psql -d template_postgis -f $POSTGIS_SQL_PATH/postgis.sql) At that point I am getting an error at the first SQL statement that is tried to be run. When I try that on the psql prompt the result is as follows: template_postgis=# CREATE OR REPLACE FUNCTION st_spheroid_in(cstring) RETURNS spheroid AS '/usr/local/pgsql/lib/postgis-1.5','ellipsoid_in' LANGUAGE 'C' IMMUTABLE STRICT; NOTICE: type "spheroid" is not yet defined DETAIL: Creating a shell type definition. ERROR: could not load library "/usr/local/pgsql/lib/postgis-1.5.so": dlopen(/usr/local/pgsql/lib/postgis-1.5.so, 10): Symbol not found: _DatumGetFloat4 Referenced from: /usr/local/pgsql/lib/postgis-1.5.so Expected in: /opt/local/lib/postgresql83/bin/postgres in /usr/local/pgsql/lib/postgis1.5.so Any ideas what might have been messed up?

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• Parsing Indentation-based syntaxes in Haskell's Parsec

  - by pavpanchekha

  I'm trying to parse an indentation-based language (think Python, Haskell itself, Boo, YAML) in Haskell using Parsec. I've seen the IndentParser library, and it looks like it's the perfect match, but what I can't figure out is how to make my TokenParser into an indentation parser. Here's the code I have so far: import qualified Text.ParserCombinators.Parsec.Token as T import qualified Text.ParserCombinators.Parsec.IndentParser.Token as IT lexer = T.makeTokenParser mylangDef ident = IT.identifier lexer This throws the error: parser2.hs:29:28: Couldn't match expected type `IT.TokenParser st' against inferred type `T.GenTokenParser s u m' In the first argument of `IT.identifier', namely `lexer' In the expression: IT.identifier lexer In the definition of `ident': ident = IT.identifier lexer What am I doing wrong? How should I create an IT.TokenParser? Or is IndentParser broken and to be avoided?

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• Different NSTimeZone names being returned

  - by Michael Waterfall

  I've noticed that on some devices the NSTimeZone's name method for a particular timezone can return different values. When testing the Brisbane time zone, my device returns @"Australia/Brisbane" whereas another user's device returns "Etc/GMT-10". Both iPhone's are running 3.1.2. The Date and Time Programming Guide for Cocoa states that: timeZoneWithName: The name passed to this method may be in any of the formats understood by the system, for example EST, Etc/GMT-2, America/Argentina/Buenos_Aires, Europe/Monaco, or US/Pacific, as shown in the following code fragment. I'd just like to know what could determine which value is used? The device? The language?

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• java equivalent of ruby's ||= syntax

  - by brad

  I'm brand new to java, coming from a ruby world. One thing I love about ruby is the very terse syntax such as ||=. I realize of course that a compiled language is different, but I'm wondering if Java has anything similar. In particular, what I do all the time in ruby is something like: someVar ||= SomeClass.new I think this is incredibly terse, yet powerful, but thus far the only method I can think of to achieve the same thing is a very verbose: if(someVar == null){ someVar = new SomeClass() } Just trying to improve my Java-fu and syntax is certainly one area that I'm no pro.

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• Using javascript to open a popup window

  - by newName

  I would like to open a popup window using javascript in my c#.net app. This is the code in the body tag in my webform <script language=javascript> function openWindow(strEmail) { window.open('CheckEmail.aspx?email=' + strEmail + , 'Check Email','left=100,top=100,toolbar=no,scrollbars=yes,width=680,height=350'); return false; } </script> this is my code in the Page_Load section this.btnCheck.Attributes.Add("onclick", "return openWindow(" + txtEmail.Text + ");"); right now I'm trying to pass the string from my textbox "txtEmail" so in my popup window i can get the request.querystring but Im a little unsure of how the syntax is.

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• Detecting Infinite recursion in Python or dynamic languages

  - by drozzy

  Recently I tried compiling program something like this with GCC: int f(int i){ if(i<0){ return 0;} return f(i-1); and it ran just fine. When I inspected the stack frames the compiler optimized the program to use only one frame, by just jumping back to the beginning of the function and only replacing the arguments to f. And - the compiler wasn't even running in optimized mode. Now, when I try the same thing in Python - I hit maximum recursion wall (or stack overflow). Is there way that a dynamic language like python can take advantage of these nice optimizations? Maybe it's possible to use a compiler instead of an interpreter to make this work? Just curious!

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• Convert T-SQL function to PL/SQL

  - by llasarov

  can you help me convert following T-SQL funcntion into Oracle. The function converts a string like service|nvretail;language|de;yyyy|2011; to a table. The main problem I have is the usage of the temp table. I could not find any equivalent to it in Oracle. CREATE FUNCTION [dbo].[TF_ConvertPara] ( @parastringNVARCHAR(max) ) RETURNS @para TABLE ( [Key] varchar(max), [Value] varchar(max) ) begin DECLARE @NextString NVARCHAR(40) DECLARE @Pos1 INT DECLARE @Pos2 INT DECLARE @NextPos INT DECLARE @Delimiter1 NCHAR=';' DECLARE @Delimiter2 NCHAR='|' if substring(@paraString, len(@paraString) - 1, 1) <> @Delimiter1 SET @paraString = @paraString + @Delimiter1 SET @Pos1 = charindex(@Delimiter1, @paraString) WHILE (@pos1 <> 0) BEGIN SET @NextString = substring(@paraString, 1, @Pos1 - 1) SET @paraString = substring(@paraString, @pos1 + 1, len(@paraString)) SET @pos1 = charindex(@Delimiter1, @paraString) SET @Pos2 = charindex(@Delimiter2, @NextString) if (@Pos2 > 0) begin insert into @para values (substring(@NextString, 1, @Pos2 - 1), substring(@NextString, @Pos2 + 1, len(@NextString))) end END return; end Thank you in advance.

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• Restoring a "Canceled" event with Google Calendar API?

  - by user283182

  I'm trying to change the status of an event back from "canceled" to "confirmed" using Google Calendar API (I'm using .NET but an answer in any language would help) but I get GDataRequestException error: "You can't modify a cancelled event" If I've used the API to delete an event in a repeating series, for example, is it possible to change the status of the resulting recurrence exception (there's no EXDATE, just a new "canceled" event that is only visible when the feed is requested with start and end date) to "confirmed" (or even delete the resulting exception completely) in order to restore the repeating series to the original state? event.Delete() and event.Update() don't even see the event any longer once it's been .canceled. event.Update() gives the above error. Thanks!

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• jQuery to get the text attribute of a checkbox

  - by Andriyev

  Hi I'm adding a check box to a page using the following statement; <script language="C#" runat="server"> protected void Page_Load ( object src, EventArgs e ) { if (!IsPostBack) { CheckBox XChkBox = new CheckBox(); //instance of System.Web.UI.WebControls.CheckBox XChkBox.ID = "someId" XChkBox.Text = "someText" somePlaceHolder.Controls.Add(XChkBox); } } </script> I need to get the Text attribute of that check box on click. I tried $(this).attr('Text'); inside $('input[type=checkbox]').click(function(){}); but it returns undefined. Where am I going wrong? Please suggest. cheers

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• ASP.NET Hosting Options

  - by Adam Haile

  I'm not trying to start a "which language is better" argument here, so please don't go there. I typically use PHP for most of my web development (mostly because hosting is cheap), but for various reasons I'm looking to use ASP.NET for a couple new projects. But one of the major reasons I've stayed away from ASP.NET up until now is the cost. I've seen some budget hosting options, but they always seem a little sketchy to me. From what I've generally found, that's just the way the hosting scene looks for ASP.NET unless you want to go dedicated. Does anyone have any good suggestions for a solid ASP.NET host with a good feature set and reliability for my money? Also, are there any options out there along the lines of Amazon's Elastic Compute Cloud? And yes, I know... Mono. I'm talking about Windows based "grid" hosting options?

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• How do Scala parser combinators compare to Haskell's Parsec?

  - by artif

  I have read that Haskell parser combinators (in Parsec) can parse context sensitive grammars. Is this also true for Scala parser combinators? If so, is this what the "into" (aka "") function is for? What are some strengths/weaknesses of Scala's implementation of parser combinators, vs Haskell's? Do they accept the same class of grammars? Is it easier to generate error messages or do other miscellaneous useful things with one or the other? How does packrat parsing (introduced in Scala 2.8) fit into this picture? Is there a webpage or some other resource that shows how different operators/functions/DSL-sugar from one language's implementation maps onto the other's?

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• What are logical and path queries

  - by NomeN

  I'm reading a paper which mentions that a language for refactoring has three specific requirements. functional features (like ML) logical queries (like Datalog) path queries (like Datalog) I know what they mean by functional features, but I'm not totally clear on the latter two and can't find a clear explanation either. Although I have a good idea after what I could find on the subjects, I need to be sure so here goes: Could the SO-community please clearly explain to me what logical queries and path queries are? Or at the very least what the people from the paper meant?

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• Cure for puzzle piece programming habits?

  - by Recursion

  Even though I went to a decent CS school, I was still taught with the mentality of programming with puzzle pieces. By puzzle pieces I mean, looking up code segments at each step of the development process and adding them together as needed. Eventually gathering all of the pieces and having a properly working program. So as an example, if in my program the next step is to tokenize a string, I go to google and search "how do I tokenize a string in language". All instead of critically thinking about its implementation. I personally don't think its a very good way to program and I always seem to forget everything that I have searched for. So how can I get out of this puzzle piece mode of programmer that I was taught.

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• Controller getting NULL value?

  - by RSolberg

  I'm trying to make a call to a controller via jQuery $.post, but the parameter for my controller method keeps getting a NULL value despite it appearing to be setup similar to other controller methods. CONTROLLER [AcceptVerbs(HttpVerbs.Post)] public ActionResult SearchWeatherLocations(string searchFor) { //Do Some Magic } GLOBAL.ASAX routes.MapRoute("SearchWeatherLocations", "Home/SearchWeatherLocations/{searchFor}", new { controller = "Home", action = "SearchWeatherLocations" }); jQuery Call From View <script type="text/javascript" language="javascript"> $(document).ready(function () { GetWeatherLocations("seat"); }); function GetWeatherLocations(sSearchFor) { var divToBeWorkedOn = '#locations'; var webMethod = '<%= Url.Action("SearchWeatherLocations", "Home") %>/'; var url = webMethod + sSearchFor; $.post(url, function (data) { $('#locations').children().remove(); for (var count in data) { $('#locations').append("<li>" + data[count].LocationName + "&nbsp;(" + data[count].LocationCode + ")</li>"); } }); } </script>

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• Is there a config option in PHP to prevent undefined constants from being interpreted as strings?

  - by mrbinky3000

  This is from the php manual: http://us.php.net/manual/en/language.constants.syntax.php If you use an undefined constant, PHP assumes that you mean the name of the constant itself, just as if you called it as a string (CONSTANT vs "CONSTANT"). An error of level E_NOTICE will be issued when this happens. I really don't like this behavior. If I have failed to define a required constant, I would rather the script fail so that I am forced define it. Is there any way to force PHP to crash the script if it tries to use an undefined constant? For example. Both of these scripts do the same thing. <?php define('DEBUG',1); if (DEBUG) echo('Yo!'); ?> and <?php if(DEBUG) echo('Yo!'); ?> I would rather the second script DIE and declare that it tried to use an undefined constant DEBUG.

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• Advanced command line argument parsing in Java?

  - by Bishop87

  Does anyone have any java examples for parsing a series of command line arguements in a robust way? I'm looking to be able to handle something like: java myapp [-l language] [-d int] [-f file1 file2 file3] I want to do this in a robust way so I can provide logical error messages to the user if they mistake a command line-option. Some of these options I'd like to make optional, etc, etc. Also, the -f file list should be able to handle a list of files. Is there some library out there to assist me in handling this?

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• Dynamic choices for Django SelectMultiple Widget

  - by PhilGo20

  I'm building a form (not modelForm) where i'd like to use the SelectMultiple Widget to display choices based on a query done during the init of the form. I can think of a few way to do this but I am not exactly clear on the right way to do it. I see different options. I get the "choices" I should pass to the widget in the form init but I am not sure how I should pass them. class NavigatorExportForm(forms.Form): def __init__(self,user, app_id, *args,**kwargs): super (NavigatorExportForm,self ).__init__(*args,**kwargs) # populates the form language_choices = Navigator.admin_objects.get(id=app_id).languages.all().values_list('language', flat=True) languages = forms.CharField(max_length=2, widget=forms.SelectMultiple(choices=???language_choices))

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• Modifying a model and texture mid-game code

  - by MicroPirate

  Just have a question for anyone out there who knows some sort of game engine pretty well. What I am trying to implement is some sort of script or code that will allow me to make a custom game character and textures mid-game. A few examples would be along the lines of changing facial expressions and body part positions in the game SecondLife. I don't really need a particular language, feel free to use your favorite, I'm just really looking for an example on how to go about this. Also I was wondering if there is anyway to combine textures for optimization; for example if i wanted to add a tattoo to a character midgame, is there any code that could combine his body texture and the tattoo texture into one texture to use (this way I can simply just render one texture per body.) Any tips would be appreciated, sorry if the question is a wee bit to vauge.

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• TinyMCE: Double forecolor and backcolor buttons?

  - by petsson

  I'm having a problem using TinyMCE. In IE8, the forecolor and backcolor, for some random reason, is displayed twice. See picture below. Source code (I add the forecolor and backcolor in theme_advanced_buttons2): tinyMCE.init({ mode : "exact", elements : "<%= editArea.ClientID %>", custom_shortcuts : false, language : "en", relative_urls : false, convert_urls : false, forced_root_block : false, force_p_newlines : true, force_br_newlines : false, fix_nesting : true, plugins : "pagebreak,table", pagebreak_separator : '<div style="page-break-after:always;"></div>', theme : "advanced", skin : "o2k7", skin_variant : "blue", width : "540", height : "470", theme_advanced_toolbar_location : "top", theme_advanced_statusbar_location : "none", theme_advanced_font_sizes : "1,2,3,4,5,6,7", font_size_style_values : "0.6em,0.8em,1em,1.2em,1.5em,2em,3em", theme_advanced_buttons1 : "newdocument,|,copy,cut,paste,|,hr,pagebreak,|,undo,redo,|,code|,image,code", theme_advanced_buttons2 : "fontselect,fontsizeselect,|,bold,italic,underline,strikethrough,|,justifyleft,justifycenter,justifyright,justifyfull,|,forecolor,backcolor", // <-- This gives me double forecolor and backcolor theme_advanced_buttons3 : "table,|,row_props,cell_props,|,col_before,col_after,row_before,row_after,|,split_cells,merge_cells,|,delete_col,delete_row," });

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• Help with MVC controller: passing a string from view to controller

  - by 109221793

  Hi guys, I'm having trouble with one particular issue, I was hoping someone could help me out. I've completed the MVC Music Store tutorial, and now I'm trying to add some administrator functionality - practice as I will have to do this in an MVC application in my job. The application is using the aspnet membership api, and what I have done so far is created a view to list the users. What I want to be able to do, is click on the users name in order to change their password. To try and carry the username to the changeUserPassword controller (custom made). I registered a new route in the global.asax.cs file in order to display the username in the URL, which is working so far. UserList View <%: Html.RouteLink(user.UserName, "AdminPassword", new { controller="StoreManager", action="changeUserPassword", username = user.UserName }) %> Global.asax.cs routes.MapRoute( "AdminPassword", //Route name "{controller}/{action}/{username}", //URL with parameters new { controller = "StoreManager", action = "changeUserPassword", username = UrlParameter.Optional} ); So now the URL looks like this when I reach the changeUserPassword view: http://localhost:51236/StoreManager/changeUserPassword/Administrator Here is the GET changeUserPassword action: public ActionResult changeUserPassword(string username) { ViewData["username"] = username; return View(); } I wanted to store the username in ViewData as I would like to use it in the GET changeUserPassword for display purposes, and also as a hidden value in the form. This is in order to pass it through to enable me to reset the password. Having debugged through the code, it seems that 'username' is null. How can I get this to work so that the username carries over from the Html.RouteLink, to the changeUserPassword action? Any help would be appreciated :) Here is my complete code: UserList.aspx <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<System.Web.Security.MembershipUserCollection>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> UserList </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>UserList</h2> <table> <tr> <th>User Name</th> <th>Last Activity date</th> <th>Locked Out</th> </tr> <%foreach (MembershipUser user in Model){ %> <tr> <td><%: Html.RouteLink(user.UserName, "AdminPassword", new { controller="StoreManager", action="changeUserPassword", username = user.UserName }) %></td> <td><%: user.LastActivityDate %></td> <td><%: user.IsLockedOut %></td> </tr> <% }%> </table> </asp:Content> changeUserPassword.aspx <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<musicStoreMVC.ViewModels.ResetPasswordAdmin>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> changeUserPassword </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Change Password: <%: ViewData["username"] %></h2> <% using (Html.BeginForm()) {%> <%: Html.ValidationSummary(true) %> <fieldset> <legend>Fields</legend> <div class="editor-label"> <%: Html.Hidden("username",ViewData["username"]) %> <%: Html.LabelFor(model => model.password) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.password) %> <%: Html.ValidationMessageFor(model => model.password) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.confirmPassword) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.confirmPassword) %> <%: Html.ValidationMessageFor(model => model.confirmPassword) %> </div> <p> <input type="submit" value="Create" /> </p> </fieldset> <% } %> <div> <%: Html.ActionLink("Back to List", "Index") %> </div> </asp:Content> My actions public ActionResult UserList() { var users = Membership.GetAllUsers(); return View(users); } public ActionResult changeUserPassword(string username) { ViewData["username"] = username; return View(); }

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• How do I use the Silicon Laboratories IDE with SDCC?

  - by David Cary

  I'm thinking about using a microcontroller with an 8051 core from Silicon Laboratories. I hope that I can use C rather than assembly language, so I installed SDCC. I installed the "Silicon Laboratories IDE" to download the executable binaries to the on-chip Flash program memory. It also supposedly can be set up (under the Project Tool Chain Integration menu) to use "any" 8051 compiler. I tried to set it up to use SDCC, but every time I hit the "Assemble/Compile File" button it tells me "Compiler process did not sucessfully complete." How do I get new C code I write onto the SiLabs C8051F310 chip? Is there a web site with a step-by-step HOWTO? (Would it be easier to use a MAKEFILE that calls SDCC, only using the "Silicon Laboratories IDE" for the very last step of downloading the executable binary to the chip?)

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