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  • C# communicate with RS-232 using VISA

    - by George
    Hi, Does anyone have any C# example code to communicate with a device thru an RS-232 serial port using VISA ? I just want to issuse some simple commands and queries to the device as well as open and close it, of course. Any help or advice would be most appreciated. Regards, George.

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  • How to Access a decendant object's internal method in C#

    - by Giovanni Galbo
    I'm trying to access a method that is marked as internal in the parent class (in its own assembly) in an object that inherits from the same parent. Let me explain what I'm trying to do... I want to create Service classes that return IEnumberable with an underlying List to non-Service classes (e.g. the UI) and optionally return an IEnumerable with an underlying IQueryable to other services. I wrote some sample code to demonstrate what I'm trying to accomplish, shown below. The example is not real life, so please remember that when commenting. All services would inherit from something like this (only relevant code shown): public class ServiceBase<T> { protected readonly ObjectContext _context; protected string _setName = String.Empty; public ServiceBase(ObjectContext context) { _context = context; } public IEnumerable<T> GetAll() { return GetAll(false); } //These are not the correct access modifiers.. I want something //that is accessible to children classes AND between descendant classes internal protected IEnumerable<T> GetAll(bool returnQueryable) { var query = _context.CreateQuery<T>(GetSetName()); if(returnQueryable) { return query; } else { return query.ToList(); } } private string GetSetName() { //Some code... return _setName; } } Inherited services would look like this: public class EmployeeService : ServiceBase<Employees> { public EmployeeService(ObjectContext context) : base(context) { } } public class DepartmentService : ServiceBase<Departments> { private readonly EmployeeService _employeeService; public DepartmentService(ObjectContext context, EmployeeService employeeService) : base(context) { _employeeService = employeeService; } public IList<Departments> DoSomethingWithEmployees(string lastName) { //won't work because method with this signature is not visible to this class var emps = _employeeService.GetAll(true); //more code... } } Because the parent class lives is reusable, it would live in a different assembly than the child services. With GetAll(bool returnQueryable) being marked internal, the children would not be able to see each other's GetAll(bool) method, just the public GetAll() method. I know that I can add a new internal GetAll method to each service (or perhaps an intermediary parent class within the same assembly) so that each child service within the assembly can see each other's method; but it seems unnecessary since the functionality is already available in the parent class. For example: internal IEnumerable<Employees> GetAll(bool returnIQueryable) { return base.GetAll(returnIQueryable); } Essentially what I want is for services to be able to access other service methods as IQueryable so that they can further refine the uncommitted results, while everyone else gets plain old lists. Any ideas?

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  • How to make ASP.NET MVC2 project templates to show up in VWD2008 Express?

    - by Seh Hui 'Felix' Leong
    OK I'm completely stumped here: I have installed (and reinstalled) ASP.NET MVC2 installed several times and I still can't see the ASP.NET MVC2 project templates shown in Visual Web Developer 2008 Express. I had checked the default project directory templates and had verified that those templates are installed, for example these templates files are found C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\VWDExpress\ProjectTemplates\CSharp\Web\1033: EmptyMvcWebApplicationProjectTemplatev2.0.cs.zip MvcWebApplicationProjectTemplatev2.0.cs.zip Any idea of tracking what's the problem and fix it?

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  • dotnetopenauth token ? is it required?

    - by df
    Hi, I've implementend openId login system on my site and it works ok, but when i compare what is send to openidprovider and back is different with that what is send by stackoverflow.com for example whis send s paramenter and token parameter? Are these parameteres custom parameters send by stackoverflow or dotnetopenid can sand them but you have to turn it on? Is that token against CSRF attack?

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  • setwidth of a dynamic textview

    - by sairam333
    For Example , I am using name.setWidth(100) for giving width to dynamic text view name .But this width is adjusted only android but in droid this space is not adjusted how we give the setwidth value that will adjust to both droid and android

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  • OSX, G/AWK, Bash - "illegal statement, unterminated string" and no file output.

    - by S1syphus
    I have a script that somebody from SO kindly provided to solve an issue I was having, However, I'm having some issues getting it to work on OSX. gawk --version GNU Awk 3.1.6 awk --version awk version 20100208 The original source is: awk -F, -vOFS=, -vc=1 ' NR == 1 { for (i=1; i<NF; i++) { if ($i != "") { g[c]=i; f[c++]=$i } } } NR>2 { for (i=1; i < c; i++) { print $1,$2, $g[i] > "output_"f[i]".csv } }' data.csv When I run the script it gives the following error: awk: syntax error at source line 12 context is print $1,$2, $g[i] > >>> "output_"f <<< [i]".csv awk: illegal statement at source line 13 From the look of it the variable of [i] isn't been amended to the output file, but I don't know why. If I change AWK to GAWK and run the original script here is the output: gawk: cmd. line:11: print $1,$2, $g[i] > "output_"f[i]".csv gawk: cmd. line:11: ^ unterminated string So I edit the relevant line to fix the unterminated string print $1,$2, $g[i] > "output_"f[i]".csv" Then it runs through fine produces no errors, but there is no output files. Any ideas? I spent the majority of last night and this morning pouring over this. A sample input file: ,,L1,,,L2,,,L3,,,L4,,,L5,,,L6,,,L7,,,L8,,,L9,,,L10,,,L11, Title,r/t,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,neede d,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst EXAMPLEfoo,60,6,6,6,0,0,0,0,0,0,6,6,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 EXAMPLEbar,30,6,6,12,6,7,14,6,6,12,6,6,12,6,8,16,6,7,14,6,7.5,15,6,6,12,6,8,16,6,0,0,6,7,14 EXAMPLE1,60,3,3,3,3,5,5,3,4,4,3,3,3,3,6,6,3,4,4,3,3,3,3,4,4,3,8,8,3,0,0,3,4,4 EXAMPLE2,120,6,6,3,0,0,0,6,8,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 EXAMPLE3,60,6,6,6,6,8,8,6,6,6,6,6,6,0,0,0,0,0,0,6,8,8,6,6,6,0,0,0,0,0,0,0,10,10 EXAMPLE4,30,6,6,12,6,7,14,6,6,12,6,6,12,3,5.5,11,6,7.5,15,6,6,12,6,0,0,6,9,18,6,0,0,6,6.5,13 And the example out put should be So for L1 an example out put would look like: EXAMPLEfoo,60,6 EXAMPLEbar,30,6 EXAMPLE1,60,3 EXAMPLE2,120,6 EXAMPLE3,60,6 EXAMPLE4,30,6 And for L2: EXAMPLEfoo,60,0 EXAMPLEbar,30,6 EXAMPLE1,60,3 EXAMPLE2,120,0 EXAMPLE3,60,6 EXAMPLE4,30,6

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  • IPython tab completion not working

    - by djpark121
    Tab completion on IPython seems not to be working. For example, import numpy numpy.<tab> simply adds a tab. import numpy num<tab> just adds a tab, too. Could you please suggest some possible causes for this problem? I am running Windows 7 and Python 2.6.5.

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  • Per-User basis security with restful_authentication in Rails ?

    - by benoror
    Hi! I'm using restful_authentication plugin, but I would like to have per-user security, for example: class PostsController < ApplicationController # Login required before_filter :login_required, :except => [ :index, :show ] # Only the same user can create, edit and delete their own posts before_filter :only_by_same_user, :only => [ :create, :update, :destroy ] end Thanks!

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  • Django : debugging templatetags

    - by interstar
    How on earth do people debug Django templatetags? I created one, based on a working example, my new tag looks the same to me as the existing one. But I just get a 'my_lib' is not a valid tag library: Could not load template library from django.templatetags.my_lib, No module named my_lib I know that this is probably because of something failing when defining the lib. But how do I see what's going on? What do you use to debug this situation?

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  • Generating a list of values a regex COULD match in Python

    - by mlissner
    I'm trying to use a regex as an input, and from there generate all the possible values that the regex would match. So, for example, if the regex is "three-letter words starting with a, and ending in c," then the code would generate a list with the values [aac, abc, acc, adc, a1c....]. Is there an easy way to do this? I'm using python.

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  • Best way to handle multiple tables to replace one big table in Rails? (e.g. 'Books1', 'Books2', etc.

    - by mikep
    Hello, I've decided to use multiple tables for an entity (e.g. Books1, Books2, Books3, etc.), instead of just one main table which could end up having a lot of rows (e.g. just Books). I'm doing this to try and to avoid a potential future performance drop that could come with having too many rows in one table. With that, I'm looking for a good way to handle this in Rails, mainly by trying to avoid loading a bunch of unused associations. (I know that I could use a partition for this, but, for now, I've decided to go the 'multiple tables' route.) Each user has their books placed into a specific table. The actual book table is chosen when the user is created, and all of their books go into the same table. I'm going to split the adds across the tables. The goal is to try and keep each table pretty much even -- but that's a different issue. One thing I don't particularly want to have is a bunch of unused associations in the User class. Right now, it looks like I'd have to do the following: class User < ActiveRecord::Base has_many :books1, :books2, :books3, :books4, :books5 end class Books1 < ActiveRecord::Base belongs_to :user end class Books2 < ActiveRecord::Base belongs_to :user end class Books3 < ActiveRecord::Base belongs_to :user end I'm assuming that the main performance hit would come in terms of memory and possibly some method call overhead for each User object, since it has to load all of those associations, which in turn creates all of those nice, dynamic model accessor methods like User.find_by_. But for each specific user, only one of the book tables would be usable/applicable, since all of a user's books are stored in the same table. So, only one of the associations would be in use at any time and any other has_many :bookX association that was loaded would be a waste. For example, with a user.id of 2, I'd only need books3.find_by_author('Author'), but the way I'm thinking of setting this up, I'd still have access to Books1..n. I don't really know Ruby/Rails does internally with all of those has_many associations though, so maybe it's not so bad. But right now I'm thinking that it's really wasteful, and that there may just be a better, more efficient way of doing this. So, a few questions: 1) Is there's some sort of special Ruby/Rails methodology that could be applied to this 'multiple tables to represent one entity' scheme? Are there any 'best practices' for this? 2) Is it really bad to have so many unused has_many associations for each object? Is there a better way to do this? 3) Does anyone have any advice on how to abstract the fact that there's multiple book tables behind a single books model/class? For example, so I can call books.find_by_author('Author') instead of books3.find_by_author('Author'). Thank you!

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  • Why do some websites add "Slugs" to the end of URLs?

    - by Dave Webb
    Many websites, including this one, add what are apparently called slugs - descriptive but as far as I can tell useless bits of text - to the end of URLs. For example, the URL the site gives for this question is: http://stackoverflow.com/questions/47427/why-do-some-websites-add-slugs-to-the-end-of-urls But the following URL works just as well: http://stackoverflow.com/questions/47427/ Is the point of this text just to somehow make the URL more user friendly or are there some other benefits?

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  • Why is file_get_contents() faster than using fsock_open()?

    - by eds
    In PHP, sometimes I want to send an HTTP request to a remote site just to look at the response headers, so I declare it all manually and use the fsock_open() function. However, this goes much slower than calling file_get_contents() with a remote URL (which loads the whole page content). Why is this? Is there a good alternative way to get just the response headers (to check if a page returns a 404 error, for example) that works as fast as file_get_contents()?

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  • "SSH server" in Windows?

    - by Benjamin Oakes
    I have some command-line commands to execute on a Windows machine. The programs I need to run are only available on Windows. Is there a way to easily to do something like I would do with SSH? Example of what I mean: ssh [email protected] "remote command to execute" ...or do I have to Remote Desktop just to do this? (I'd like to run the commands programmatically from another computer rather than running them by hand.)

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  • Filtering a collection based on filtering rules

    - by Mike
    I have an observable collection of Entities, with each entity having a status added, deleted, modified and cancelled. I have four buttons (toggle) when clicked should filter my collection as below: If I select the button Added, then my collection should contain entities with status added. If I select the button Deleted and Added, then my collection should contain entities with status Deleted AND entities with status Added, none of the rest. If I select the button Deleted,Added and Modified, then my collection should contain entities with status Deleted, Added AND Modified. . . so on. If I unselect one of the buttons, it should remove those entities from the collection with that status. For example if I unselect Deleted, but select Added and Modified, then my collection should contain items with Added and Modified status and NOT Deleted ones. For implementing this I have created a master collection and a filtered collection. The Filter collection gets filtered based on the selections and unselections. The following is my code: private bool _clickedAdded; public bool ClickedAdded { get { return _clickedAdded; } set { _clickedAdded = value; if(!_clickedAdded) FilterAny(typeof(Added)); } } private bool _clickedDeleted; public bool ClickedDeleted { get { return _clickedDeleted; } set { _clickedDeleted = value; if (!_clickedDeleted) FilterAny(typeof(Deleted)); } } private bool _clickedModified; public bool ClickedModified { get { return _clickedModified; } set { _clickedModified = value; if (!_clickedModified) FilterAny(typeof(Modified)); } } private void FilterAny(Type status) { Func<Entity, bool> predicate = entity => entity.Status.GetType() != status; var filteredItems = MasterEntites.Where(predicate); FilteredEntities = new ObservableCollection<Entity>(filteredItems); } This however breaks the above rules - for example if I have all selected, and then I remove Added followed by deleted then it still shows the list of Added, Modified and Cancelled. It should be just Modified and Cancelled in the filtered collection. Can you please help me in solving this issue? Also do I need 2 different list to solve this. Please note that I'm using .NET 3.5.

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  • python3: removing several chars from a string with a long chain of .replace().replace().replace()

    - by MadSc13ntist
    I found this example on stack overflow. I understand it, but seems like a bit much for such a simple method concept... removing several chars from a string. import string exclude = set(string.punctuation) s = ''.join(ch for ch in s if ch not in exclude) is there a builtin string method in python 3.1 to do something to the tune of: s = "a,b,c,d,e,f,g,h,i" s = s.strip([",", "d", "h"]) instead of: s = s.replace(",", "").replace("d", "").replace("h", "")

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  • Why Is ToString() Rounding My Double Value?

    - by user163757
    How do I prevent my double value from being rounded when converting to a string? I have tried both Convert.ToString and ToString() with the same result. For example my double may look something like 77.987654321, and the two strings conversions convert to to 77.98765. I need to keep the precision of the value as is.

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  • Set different line format for a graph with more than one serie with pChart

    - by woodgate
    I am actually using the pChart PHP library for generate graphs. I wanna know if it's possible to give a different line format for a graph with multiple series. I need a line with for example 3px of width but other line with 1px of width. Is that possible? In the official documentation only appears a function that give format to the lines of all series: http://pchart.sourceforge.net/documentation.php?topic=pChart#setLineStyle Thanks a lot.

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  • Simple javascript to mimic jQuery behaviour of using this in events handlers

    - by Marco Demaio
    This is not a question about jQuery, but about how jQuery implements such a behaviour. In jQuery you can do this: $('#some_link_id').click(function() { alert(this.tagName); //displays 'A' }) could someone explain in general terms (no need you to write code) how do they obtain to pass the event's caller html elments (a link in this specific example) into the this keyword? I obviously tried to look 1st in jQuery code, but I could not understand one line. Thanks!

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  • Scala libraries and frameworks

    - by folone
    Each technology is powerful with libraries and frameworks, written for it. I understand, that Scala is able to use libraries and frameworks, written for Java. But there are already some frameworks, written for Scala in Scala. Like, for example: Lift Framework ScalaTest Scalaz Do you know any more great libraries and frameworks for Scala, written in Scala?

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  • iPhone Objective-C Simplest Way to get a stock quote

    - by norskben
    Hi guys Im wondering what is the simplest way to get the current price of a stock from say yahoo finance (or similar) in objective-C For the iPhone SDK. Simple is the key, I am looking for current price, and days movement. I havent had much luck finding an iPhone code example or library. regards

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