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• Retreive list of students registered for a particular course

  - by Pankaj Khurana

  Hi, I have moodle1.9 installed on my system and writing some custom reports. I want to retrieve list of students registered for a particular course. I have user profile field usercategoryid through which i figure out for which category he has enrolled. Course belongs to a particular category. Through mdl_user_info_data table i retrieve the category for a particular user. I have written a query to retrieve the users who have registered for a particular category for e.g. Financial Planning 2010. But the issue is that i now want users who have registered for a particular course for e.g. Insurance Planning. There is a relation between course and course category but i am unable to find out the table where course and user information is linked. Please help me on this Thanks

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• jQuery Validate - Require at least one from group, plus additional items.

  - by Kevin Pullin

  I'm attempting to use 'jQuery Validate' on a form that requires an email address plus either all items of a shipping address completed or none at all. Using the sample provided by the solution to this question: jQuery Validate - “Either skip these fields, or fill at least X of them”, I have been able to successfully solve the validation of the address group. The problem, however, is that the logic for validating the email address field does not work. From debugging the Validate scripts, the "re-entrant" validation code triggered by calling 'fields.data('being_validated', true).valid();' in the linked example results in a reset of all previously validated errors (i.e. the email validation error is cleared). I have modified some existing samples, the first in which removes the offending line and the second with it included. Email Validation Working Email Validation Fails Any tips or suggestions on how to properly solve this or work around the failure?

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• Comparison of collection datatypes in C#

  - by Joel in Gö

  Does anyone know of a good overview of the different C# collection types? I am looking for something showing which basic operations such as Add, Remove, RemoveLast etc. are supported, and giving the relative performance. It would be particularly interesting for the various generic classes - and even better if it showed eg. if there is a difference in performance between a List<T> where T is a class and one where T is a struct. A start would be a nice cheat-sheet for the abstract data structures, comparing Linked Lists, Hash Tables etc. etc. Thanks!

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• StreamWriter stops writing when file is opened from web link

  - by fearofawhackplanet

  Following on from my previous question... The following code creates log files on a web server: private void LogMessage(Message msg) { using (StreamWriter sw = File.AppendText(_logDirectory + DateTime.Now.ToString("yyyyMMddHH") + ".txt")) { sw.WriteLine(msg.ToString()); } } The log files are linked to from an admin page on the web site: foreach (FileInfo file in logDir.GetFiles()) { Response.Write("<a href='http:// .... /Logs/" + file.Name + "'>" + file.Name + "</a>"); } I'm getting the problem that after someone looks at one of the log files from the link, that log file stops being written to.

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• What are some C++ Standard Library usage best practices?

  - by apphacker

  I'm learning C++ and the book I'm reading (The C++ Programming Language) says to not reinvent the wheel, to rely on the standard libraries. In C, I often end up creating a linked list, and link list iteration over and over again (maybe I'm doing that wrong not sure), so the ideas of containers available in C++, and strings, and algorithms really appeal to me. However I have read a little online, and heard some criticisms from my friends and coworkers about STL, so I thought I maybe I'd pick some brains here. What are some best practices for using STL, and what lessons have you learned about STL?

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• designing data structures for an address book in C program??

  - by osabri

  i want that the number of address book item is not known in advance, i am thinking to use linked list is it the right choice?? "the user can enter new person data, or print the data for a given name, the asking data need not be a name but also an address on a telephone number, the program prints the whole information about a person, print the content of the book in alphabetical order. Store some data in a file; retrieve it and safe it after modification Program should write a file to the disk and retrieve the file from it. Program should be called with arguments. i will use malloc but i don't know when and how? somebody did similar task or have an idea can help me plz

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• Books on OpenGL ES targeted towards the iPhone

  - by Frank V

  There are a few posts on this site about OpenGL and the iPhone. Some even on books but I think you'll find this question is a bit different. I've searched and searched and have come to the conclusion that there are currently no books that specifically cover OpenGL ES on the iPhone platform. There are books that cover OpenGL ES [2.0] (note: the linked book covers OpenGL ES 2.0 but the iPhone uses OpenGL ES 1.1 which, I understand, is not backward compatible)... but they only have a small section for the iPhone (if any). What I want to know, is if anybody knows of any books that are forthcoming that specifically cover OpenGL ES 1.1 on the iPhone?

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• How can I do more than one level of cascading deletes in Linq?

  - by Gary McGill

  If I have a Customers table linked to an Orders table, and I want to delete a customer and its corresponding orders, then I can do: dataContext.Orders.DeleteAllOnSubmit(customer.Orders); dataContext.Customers.DeleteOnSubmit(customer); ...which is great. However, what if I also have an OrderItems table, and I want to delete the order items for each of the orders deleted? I can see how I could use DeleteAllOnSubmit to cause the deletion of all the order items for a single order, but how can I do it for all the orders?

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• c# hierarchy collection library? - anyone know of one (e.g. GetDirectChildren, GetAllChildren, GetPa

  - by Greg

  Hi, Does anyone know of a solid C# library / approach to manage a hierarchy/web type collection? This would be a library that would basic consist of the concept of nodes & relationships, for example to model web pages/files linked under a URL, or modeling IT infrastructure. It would have key methods such as: Node.GetDirectParents() Node.GetRootParents() Node.GetDirectChildren() Node.GetAllChildren() So it's smarts would include the ability to "walk the tree" of nodes based on the relationships when someone does ask for "give me all the children under this node" for example. It ideally include a persistence layer, to save/retrieve such data to/from a databases (e.g. with a Nodes and Relationships table). Thanks

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• List of fundamental data structures - what am I missing?

  - by jboxer

  I've been studying my fundamental data structures a bunch recently, trying to make sure I've got them down cold. By "fundamental", I mean the real basic ones. Fancy ones like Red-Black Trees and Bloom Filters are clearly worth knowing, but they're usually either enhancements of fundamental ones (Red-Black Trees are binary search trees with special properties to keep them balanced) or they're only useful in very specific situations (Bloom Filters). So far, I'm "fluent" in the following data structures: Arrays Linked Lists Stacks/Queues Binary Search Trees Heaps/Priority Queues Hash Tables However, I feel like I'm missing something. Are there any fundamental ones that I'm forgetting about? EDIT: Added these after posting the question Strings (suggested by catchmeifyoutry) Sets (suggested by Peter) Graphs (suggested by Nick D and aJ) B-Trees (Suggested by tloach) I'm a little on-the-fence about whether these are too fancy or not, but I think they're different enough from the fundamental structures (and important enough) to be worth studying as fundamental.

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• Rails - Ability to Enable/Disable Links on a View?

  - by AnApprentice

  Hello, I have a UserMailer View that has several link_to's like so: <%= link_to('XXXXXXXX Link Title', item_url(@item, :only_path => false), :style => 'color:#5196E3;text-decoration:underline;') %> The page has several different links. I'd like to know if there is a way to globally set in the view to enable or disable the links. If enabled, the above would run like normal, if not the block above would just show the text (XXXXXXXX Link Title) and not be linked? Any ideas other than wrapping every link_to inside a IF statement? Thanks

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• Importing ctype; embedding python in C++ application

  - by Drew

  I'm trying to embed python within a C++ based programming language (CCL: The compuatational control language, not that any of you have heard of it). Thus, I don't really have a "main" function to make calls from. I have made a test .cc program with a main, and when I compile it and run it, I am able to import my own python modules and system modules for use. When I embed my code in my CCL-based program and compile it (with g++), it seems I have most functionality, but I get the import error: ImportError: /usr/lib/python2.6/lib-dynload/_ctypes.so: undefined symbol: PyType_GenericNew Can someone explain this to me and how to go about solving it? It seems like I've linked the objects correctly. Thanks.

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• Scrum for Team System 2010 - How to use story points instead of Hours

  - by dretzlaff17

  I have installed TFS 2010 using the Scrum for Team System v3. The work item templates want you to enter a Project Backlog Item that includes story points, then you need to add linked tasks as a child of the PBI. It is at the task level where you can assign team individuals, update estimated hours left, etc. What is the importance of the Story Points used at the PBI item if individual tasks are using hours? Has anyone customized this template so that the child work item tasks use story point burn downs instead of hours? Also, I would be nice to have the total number of story points from each individual task roll up into the PBI item as a read only field for total story points. Thanks for your time.

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• Problem with graphiz on Unix

  - by J3n

  When I'm on Unix, my graphs with graphphiz are less nice. The tail or the head of the edge is not always linked to the boundary of the port. You can see the result here : http://www.freeimagehosting.net/image.php?59d8eb4b30.jpg <xsl:value-of select="$source"/>:<xsl:value-of select="$prot"/> -&gt; <xsl:value-of select="$destination"/>:<xsl:value-of select="$prot"/>[color="black",label="<xsl:value-of select="$prot"/>",fontcolor="black",tailclip=true,headclip=true];

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• TSQL Check Database Instance Online

  - by David in Dakota

  What is the best way to check if an instance of Microsoft SQL Server is up? I have a view that spans two instances of Microsoft SQL Server but before querying it in a stored procedure I would like to verify that the second instance of the server is up with a fallback option of just querying local data. The second instance is a linked server. Currently I'm considering a SQL CLR function that can attempt to open a connection with a shorter timeout but I'm wondering if it's something that can be done directly in Transact SQL.

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• BindableAttribute, Combobox, Selectedvalue property - WinForms

  - by user63891

  I am deriving from combobox (WinForms) and am providing a new implementation for the Selectedvalue property. It works fine as is, but any change to the selectedvalue property is not updating other controls bound to the same "binding context" to change their values accordingly. I did try adding the BindableAttribute(true) to the property, but still it does nottrigger the change in value to the other linked controls. The control's DataBindings.add(...) is all set up. And other controls are also bound to the same data filed on the same datasource. Any ideas what i am doing wrong.

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• querying databases on same server with linq

  - by geoff swartz

  In normal sql I could do joins on tables in different databases as long as they were on the same server (or linked servers). In linq I can't figure out how to do that. Is this possible? For example, if I have a database called db1 and another called db2. db1 has a table called people and db2 has a table called address I could do something like... select a.addressline1, p.firstname from db1.dbo.people p inner join db2.dbo.address a on p.peopleid = a.peopleid Is this possible with linq? Thanks.

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• What is the standard way to parse floats at runtime in C?

  - by Joel J. Adamson

  Hello, I have a scientific application for which I want to input initial values at runtime. I have an option to get them from the command line, or to get them from an input file. Either of these options are input to a generic parser that uses strtod to return a linked list of initial values for each simulation run. I either use the command-line argument or getline() to read the values. The question is, should I be rolling my own parser, or should I be using a parser-generator or some library? What is the standard method? This is the only data I will read at runtime, and everything else is set at compile time (except for output files and a few other totally simple things). Thanks, Joel

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• Animating UIImageView iPhone

  - by Fred Dpn

  Hi, i'm having trouble about animating an Image in a UIImageView. I've created an image view in interface builder and linked it to its iboutlet. Here is my code. @interface Game : UIViewController <UIAccelerometerDelegate>{ IBOutlet UIImageView *diying; } @property (nonatomic, retain) UIImageView *diying; In the viewDidLoad method i've written this code NSArray * imageArray = [[NSArray alloc] initWithObjects: [UIImage imageNamed:@"Die1.gif"], [UIImage imageNamed:@"Die2.gif"], [UIImage imageNamed:@"Die3.gif"], [UIImage imageNamed:@"Die4.gif"], nil]; diying.animationImages = imageArray; diying.animationDuration = 1.1; diying.contentMode = UIViewContentModeBottomLeft; [diying startAnimating]; [super viewDidLoad]; which is a adaptation of what i've found here : http://icodeblog.com/2009/07/24/iphone-programming-tutorial-animating-a-game-sprite/ NB : those .gif files are simple images and are not animated. I did the tutorial and it worked fine but i can't figure out why it my adaptation doesn't work !

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• Why does sh/bash set command line parameter values when trying to set environment variable?

  - by Touko

  A question on basics : While tuning environment variables for a program launched from a script, I ended up with somewhat strange behaviour with sh (which seems to be actually linked to bash) : variable setting seems to mess up with command-line parameters. Could somebody explain why does this happen? A simple script: #! /bin/sh # Messes with $1 ?? set ANT_OPTS=-Xmx512M export ANT_OPTS # Works # export ANT_OPTS=-Xmx512M echo "0 = $0" echo "1 = $1" When I run this with the upper alternative (set + export), the result is as following: $ ./test.sh foo 0 = ./test.sh 1 = ANT_OPTS=-Xmx512M But with lower alternative (export straight), the result is as I supposed: $ ./test.sh foo 0 = ./test.sh 1 = foo There is surely logical explanation, I just haven't figured it out yet. Somebody who does have idea? br, Touko

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• Force php through the .net engine in iis7

  - by Rippo

  I have converted a php to asp.net mvc and have it hosted with the Rackspace cloud. All works great apart from some php links are still linked from other sites and within search engines. My question is what do I need to add to my web.config to force php sites to go through the .net engine? These links work as expected as I can catch the 404 and redirect where need be:- http://www.securahome.net/myjunk.info http://www.securahome.net/myjunk.phpp However this one doesn't:- http://www.securahome.net/myjunk.php I have spoken to Rackspace cloud and they say "its not possible as IIS doesn't recognize php files. You can setup mime types to handle them" This however makes no sense and I think they did not understand the problem. Does anyone have a solution?

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• Strange problem when converting RGB to HSV

  - by zaplec

  Hi, I made a small RGB to HSV converter algorithm with C. It seems to work pretty well, but there is one strange problem: If I first convert i.e. a 800x600 picture into HSV map and then back to RGB map without doing any changes in the values, I get some pixels that are convertet incorrectly. Then if I try to convert those misbehaving single pixels alone to and back, they're converted correctly. Any idea what could be the problem? I'm using Daniel Karlings PNGLite to open that PNG file. Here are the source code of my main.c, rgbtohsv.c and rgbtohsv.h rgbToHsv.h rgbToHsv.c pngmain.c I linked pngmain only that if somebody wants to test and run this on his own system. -zaplec

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• What can cause a persistent "Reload the page to get source for" error in firebug?

  - by ripper234

  I'm trying to debug the javascript of a specific page, and I keep seeing Reload the page to get source for page.htm in Firebug. On Chrome, I'm mostly able to debug the js, but sometimes I also get a blank page. What can cause such issues? I believe I always see a blank page in Chrome if I reload while the JS console is open. If I open a new Chrome tab, load the page, and then open the JS console, everything is ok. The page I'm debugging is on a localhost server (Play Framework server), although I have seen this on other pages occasionally. This only happens with inline javascript ... js that is linked from the page is displayed fine.

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• CakePHP save without form

  - by SDwebs

  I have a photo gallery I'm trying to set a picture as the cover for the album. I have a field cover_id in the albums table that has already been linked to the photos through the model. I'm passing the album_id and photo_id to the controller. I want to update the album.cover_id passed thru the params with the photo_id passed thru the params. Is there a way to do this or a way to make the link a form without having it look like or form or changing much of the CSS?

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• Does .NET have a linker?

  - by Water Cooler v2

  From Jon Skeet's blog: What does the following comment mean? // The line below only works when linked rather than // referenced, as otherwise you need a cast. // The compiler treats it as if it both takes and // returns a dynamic value. string value = com.MakeMeDynamic(10); I understand what referencing an assembly is. You may reference it when compiling the program files either using the /ref: switch at the command line or you may add a statically reference to the assembly in Visual Studio. But how do you link to an assembly in .NET? Does he mean, load the assembly using Reflection (Assembly.LoadFile())? Or, the Win32 API LoadLibrary()? Or, does .NET have a linker that I have never heard of?

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