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• How to implement a syndication receiver? (multi-client / single server)

  - by LeonixSolutions

  I have to come up with a system architecture. A few hundred remote devices will be communicating over internet with a central server which will receive data and store it in a database. I could write my own TCP/IP based protocol use SOAP use AJAX use RSS anything else? This is currently seen as one way (telemetry, as opposed to SCADA). Would it make a difference if we make it bi-directional. There are no plans to do so, but Murphy's law makes me wary of a uni-directional solution (on the data plane; I imagine that the control plane is bi-directional in all solutions (?)). I hope that this is not too subjective. I would like a solution which is quick and easy to implement and for others to support and where the general "communications pipeline" from remote deceives to database server can be re-used as the core of future projects. I have a strong background in telecomms protocols, in C/C++ and PHP.

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• Add values to standard expressions list in Regular Expression Editor dialog in VS 2008

  - by Alex

  Hi. In the "Regular Expression Editor" dialog in VS 2008 ( or 2005 for this matter ) , there is a list of "standard expressions" like : "French phone number" , "French postal code" etc.. And of course there is an option to select a "Custom" and then enter your own regular expression. Well.. I want to add a predefined expressions to that list . Like : "Israeli phone number" . I don't want to enter it every time by selecting a custom value . I want my developers in the team available items for them to choose. Anyone knows how to alter that list ? I've found some question about it on the web - and the answer given is that it's not possible . But that was at 2004. Anyone ?!?! Thanks.

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• Custom login in Django

  - by alpgs

  Django newbie here. I wrote simplified login form which takes email and password. It works great if both email and password are supplied, but if either is missing i get KeyError exception. According to django documentation this should never happen: By default, each Field class assumes the value is required, so if you pass an empty value -- either None or the empty string ("") -- then clean() will raise a ValidationError exception I tried to write my own validators for fields (clean_email and clean_password), but it doesn't work (ie I get KeyError exception). What am I doing wrong? class LoginForm(forms.Form): email = forms.EmailField(label=_(u'Your email')) password = forms.CharField(widget=forms.PasswordInput, label=_(u'Password')) def clean_email(self): data = self.cleaned_data['email'] if not data: raise forms.ValidationError(_("Please enter email")) return data def clean_password(self): data = self.cleaned_data['password'] if not data: raise forms.ValidationError(_("Please enter your password")) return data def clean(self): try: username = User.objects.get(email__iexact=self.cleaned_data['email']).username except User.DoesNotExist: raise forms.ValidationError(_("No such email registered")) password = self.cleaned_data['password'] self.user = auth.authenticate(username=username, password=password) if self.user is None or not self.user.is_active: raise forms.ValidationError(_("Email or password is incorrect")) return self.cleaned_data

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• PHP: How To call Standard Library Functions

  - by Andi

  Hi, I'm starting with PHP for dynamic web pages. I have some libaries written in ANSI C for getting/setting parameters and other proprietary stuff. I wonder, is there a simple solution to use a wrapper inside PHP to call this funtions? Is there a already existing class/library? What would be the best practice to do this on my own? I don't want do make calls to external applications and use stdin/stdout! Is there a simple example available? I don't want to dig through the Zend documentation for now, I only need a feeling for the complexity. Thanks, kind regards, Andi

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• An update question !

  - by rantravee

  Hi , Here's the problem I'm facing : trying to do my own application update I download the update apk from a web server on the sd card and then I launch the Package Installer with the downloading path ( while the old application is running) . So far after the package installer starts and the user agrees to install the application I get the following message " MyApp Could not be installed on this phone" and in the logcat then following message is printed : "No package identifier when getting value for resource number 0x00000000" . I could not find a reason for this behaviour , so please if there is something that I'm missing do point it to me !

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• DLL dependant on curllib.dll - How can I fix this?

  - by haraldo

  Hi there, I'm new to developing in C++. I've developed a dll where I'm using curllib to make HTTP requests. When running the dll via depend.exe it notifies me that my dll now depends on the curllib.dll. This simply doesn't work for me. My dll is set as a static library not shared and will be distributed on its own. I cannot rely on a user having libcurl.dll installed. I thought by including libcurl into my project this is all that would be needed and my dll could be independent. If this is impossible to resolve is there an alternative method I can use to create HTTP requests? Obviously I would prefer to use libcurl. Thanks in advance.

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• Start multiple processes of a dll in delphi

  - by Tom

  I have a "ActiveX library" project created with Delphi 2007. The library interface return XML data based on input values. This is then used by a PHP script that displays the data on a web page. This works great! The problem is that i can only run one instance of the dll process on the server. However, for security reasons, each of my customer should be able to access their own process of the dll (because the dll is always connected to only one database). Also, because of the way the delphi code is built, it doesn't support multiple threads. (It's a 100 000+ lines project using lots of singleton classes) Is there a way of starting several instances of the same dll? Is there a better way of transferring XML data from delphi to PHP? Sorry for the longish question, any help is appreciated (ps. I know the delphi code should be refactored, but this would mean 6 months of "circular reference" -hell :)

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• Sign Up/Login system for multi-domain/multi-server

  - by David

  I'm thinking about a good solution for implementing a sign up/login system that works across different domains and servers. A working example is Olx (you can register in one domain, and your login will work in the rest of domains). The scenario is that every domain (one per country) has its own database. And there will be 2 servers (for example), each one will have the 50% of the domains (and so the 50% of databases). What would you suggest to start with? Database: MySQL 5.1 Server-side language: PHP 5.3 (I will be using Symfony 1.4, so if someone has some suggestion for this framework, it will be interesting too, although it is optional)

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• Most Rails-y way to give different views of the same resource?

  - by Nathan Long

  In Rails, is there a canonical way of giving different views of the same resource? For example, a directory of people, where each person can have multiple photos, phone numbers, email addresses, etc. The people, photos and phone numbers are actually different resources with their own RESTful actions. But when viewing people, one page might shows everyone's name and associated photos; another page is names and associated contact information, formatted for printing. Would it be more "Rails-y" to: Create additional actions on the People controller besides the RESTful ones, like "index_with_contact_info"? Create a different controller and a different group of views? Neither seems quite right to me, but the first seems more likely. Any thoughts?

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• How to get generate WSDL using GroovyWS

  - by James Black

  I am implementing SOAP web services for a commercial application, and I am using GroovyWS to speed up the development. But, when I deploy it on Tomcat, I am not using Grails, as the software has it's own J2EE framework, so how I do I get it to react to wsdl requests? Do I need to write a groovy-based servlet? Ideally I would like the WSDL generated upon request, so I can easily change the interface and see the change. It seems I will miss the annotations that JAX-WS provides for, though, to help fine-tune the WSDL.

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• iPhone: scroll view with arbitrary page/"settling" boundaries?

  - by Ben

  Hi all, I'm trying to figure out if I can get what I want out of UIScrollView through some trickery or whether I need to roll my own scroll view: I have a series of items in row that I want to scroll through. One item should always be centered in the view, but other items should be visible to either side. In other words, I want normal scrolling and edge bouncing, but I want the deceleration when the user ends a touch to naturally settle at some specified stop point. (Actually now that I think of it, this behavior is similar to coverflow in this respect.) I know UIScrollView doesn't do this out of the box, but does anyone have suggestions for how it might be made to do this, or if anyone's spotted any code that accomplishes something similar (I'm loathe to reimplement all the math for deceleration and edge bounce) Thanks!

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• How Java Runtime Maps to Targets

  - by zharvey

  According to the Javadocs for Runtime here: Every Java application has a single instance of class Runtime that allows the application to interface with the environment in which the application is running. The current runtime can be obtained from the getRuntime method. An application cannot create its own instance of this class. My question is: what's their definition of an application? Is each JAR/WAR/EAR considered a standalone application? What about a plain ole' Driver.class class with a main() method? What about JEE containers that house EARs and EJBs? I guess I'm trying to understand how many Runtime instances could be up and running inside a complex (JEE) system. And understanding that requires me to understand what specific "things" constitute an "application" in Java terminology. Thanks in advance!

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• Automatically pulling on remote server with Git push?

  - by Vernon

  Here's what I'm trying to do: I have a GitHub repository, a portion of which I'd like to make web viewable. Right now I've cloned the repository on my own server and it works well, but in order to keep it up to date, I have to manually login and pull the latest changes. I'm not sure if this is the best idea (or the best approach), but I'd like the remote server to automatically pull whenever someone pushes to repository. GitHub makes it easy enough to run a script when someone pushes, but I'm not sure how to pull once someone does that. I was using PHP for simplicity, but just doing something like git pull naturally doesn't work because of permissions. Is this a bad idea or is there another way of achieving what I want to do? This seems like a common set up, but I wasn't sure. Thanks.

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• Single SignOn - Best practice

  - by halfdan

  Hi Guys, I need to build a scalable single sign-on mechanism for multiple sites. Scenario: Central web application to register/manage account (Server in Europe) Several web applications that need to authenticate against my user database (Servers in US/Europe/Pacific region) I am using MySQL as database backend. The options I came up with are either replicating the user database across all servers (data security?) or allowing the servers to directly connect to my MySQL instance by explicitly allowing connections from their IPs in my.cnf (high load? single point of failure?). What would be the best way to provide a scalable and low-latency single sign-on for all web applications? In terms of data security would it be a good idea to replicate the user database across all web applications? Note: All web applications provide an API which users can use to embed widgets into their own websites. These widgets work through a token auth mechanism which will again need to authenticate against my user database.

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• SVG - From Window coordinates to ViewBox coordinates

  - by user353072

  Hi, Basically I have an svg "SecondSVG" into an svg "FirstSVG" into an svg "MainSVG".Every svg has its own ViewBox. This page can be loaded anywhere on the screen by another page. So basically how can i find the screen x for viewBox for"SecondSVG" knowing that this svg can be loaded basically anywhere based on the calling page? event.clientX gives myself the x coordinate for the screen. If I don't know the coordinate for ViewBox of "SecondSVG" then how can I find out the x coordinate inside the ViewBox of "SecondSVG"? I am using Firefox 3.6.3 and I do have an event object from which I can extract clientX, clientY and other coordinates that are relative to the screen. However what I need are the coordinates inside the ViewBox.

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• GPL License in closed source application

  - by Alec Smart

  Hello, This question has been asked multiple times I know. From what I understand, broadly speaking, if I include a GPL module in my app, I have to also release my app's source code for free. Now if the module is a java app (which I have modified) and included in my own java app, and say I use it as an applet on my website, do I need to distribute the source code to all the users visiting the website? Can I distribute the code only to people who ask for it? If I sell my applet, do I need to distribute the source code to all the users or ONLY to the users who purchase my applet? Thank you very much for your time.

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• In Prism (CAL), how can I RegisterPresenterWithRegion instead of RegisterViewWithRegion

  - by Edward Tanguay

  I have a module in a Prism application and in its initialize method I want to register a presenter instead of a view with a region, i.e. I want to do this: PSEUDO-CODE: regionManager.RegisterPresenterWithRegion( "MainRegion", typeof(Presenters.EditCustomerPresenter)); instead of loading a view like this: regionManager.RegisterViewWithRegion( "MainRegion", typeof(Views.EditCustomerView)); The presenter would of course bring along its own view and ultimately register this view in the region, but it would allow me to bind the presenter to the view in the presenter's constructor instead of binding the two together in XAML (which is more of a decoupled MVVM pattern which I want to avoid here). How can I add a Presenter to a Region instead of a view? namespace Client.Modules.CustomerModule { [Module(ModuleName = "CustomerModule")] public class CustomerModule : IModule { private readonly IRegionManager regionManager; public CustomerModule(IRegionManager regionManager) { this.regionManager = regionManager; } public void Initialize() { regionManager.RegisterViewWithRegion("MainRegion", typeof(Views.EditCustomerView)); } } }

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• which Server I have to buy?

  - by sri

  Hello, Recently i have registered startup (home office). My intension is to have virtual(company) server for LAMP website development(virtual). Initially thinking, 2-5 people will be logging virtually to the server. a. but not sure where to shop or what to shop. b. Should I go for my own Server or i have to share some server. c. If i have to go My Server, should I go with rack or tower model. d. which brand and model i have to buy. d. If I have to go with shared(cloud), not sure which is the best place It will be great help, if some one provide in site. Thanks in advance. Sri

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• Objects in interface

  - by Peter Kowalchuk

  I created my own object, PKSurvey. In the interface of the View Controller I can define a pointer to it, then in a method I can alloc it and have an instance. How do I keep the instance beyond the method where it was allocated? I assign values in one method and want to be able to use those values in other methods. Should I allocate it in the viewDidLoad method or should I do it somewhere else? @interface DIrectionalDrillerViewController : UIViewController { PKSurvey *Survey=[PKSurvey new]; ---------------- - (void)viewDidLoad { [Survey new];

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• How to prevent Spell checking code in MS Office?

  - by Aaron

  We use MS Office. Outlook for emails, Word for some documentation and I use OneNote a lot for my own note taking. What bugs me is when I drop some code or use key words or even camel case into these apps the spell checking picks them up and I have red squiggles everywhere. Ignore is pretty much useless, so either I have to turn off Spell Check altogether start adding these to the custom dictionary. What would be good is if I can use the Set Language function to mark a whole block of text to just not be spell checked. Has anyone found a nice solution to this or do you know of a blank dictionary is best to use? I found using "Mohawk" kind of does that... might just use that for now. Maybe create a macro to switch between them.

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• Android P2P Multiplayer game (with a) XMPP/Google talk b) JXTA peerdroid c) other way)

  - by Kristof

  Hi, I am an android developer and I made some board games. Now i want to make some of my board games multiplayer. I don't want to create and host my own web service, so i thought about P2P. The first thing i found was the XMPP protocol, however it's not real P2P, but if i can use the existing google talk service, i'm ready to go. Is this possible while using your existing google account without interfering with the normal working of your google talk client? Then i heard about JXTA, a real P2P solution, and it's already ported from J2ME to Android (http://code.google.com/p/peerdroid/). Maybe i am overcomplexing things here (as i do sometimes) I just want to know the easiest way to do simple P2P for a boardgame. All your opinions are welcome! Thanks in advance

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• A quick over view of facebook's db?

  - by Matt

  Hey guys I find it hard to believe that Facebook uses simple sql, surely it would use some other method but lets assume for now it does use sql how would the code assimilating the 'wall' work? Lets say that there is three tables (just for the example) Friends: id (entry key) - uid(your id) - fid (your mates' id) Wall:id (entry key) - username - comment - time - commentcount comments: id (entry key) - wid (wall id (original comment)) - reply - time Lets forget about the like part and report etc, as well as mod things (ip, ban etc.) How would this work? Select wall.id, wall.username, wall.comment, wall.time, wall.commentcount, comments.wid, comments.reply, comments.time FROM wall inner join comments ON wall.id=comments.wid ORDER BY wall.time; That's your own wall but how do they get friend's? A heap of unions?

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• Why is the CoreData stack in XCode's CoreData enabled template treated as private?

  - by rob5408

  In regards to XCode templates with CoreData enabled, I've read http://stackoverflow.com/questions/2729055/unclear-use-of-property-in-window-app-using-core-data which goes over the 'what' in the templates. But I am having an issue with the 'why'. By declaring the category in the implementation file, the CoreData accessors act like private methods. The problem with that is whenever you want to use CoreData elsewhere in your app, you need some extra code. I've figured you need to either supply your own method that exposes the managed object context, such as... - (NSManagedObjectContext *)getManagedObjectContext { return self.managedObjectContext; } ...which will allow other parts of your app to use it. Or you would need to jam pack your app delegate with specific methods to return managed objects, ie getProducts or setUser. Can anyone shed light on the reasoning here?

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• Single SingOn - Best practice

  - by halfdan

  Hi Guys, I need to build a scalable single sign-on mechanism for multiple sites. Scenario: Central web application to register/manage account (Server in Europe) Several web applications that need to authenticate against my user database (Servers in US/Europe/Pacific region) I am using MySQL as database backend. The options I came up with are either replicating the user database across all servers (data security?) or allowing the servers to directly connect to my MySQL instance by explicitly allowing connections from their IPs in my.cnf (high load? single point of failure?). What would be the best way to provide a scalable and low-latency single sign-on for all web applications? In terms of data security would it be a good idea to replicate the user database across all web applications? Note: All web applications provide an API which users can use to embed widgets into their own websites. These widgets work through a token auth mechanism which will again need to authenticate against my user database.

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• How do I manage report paging in HTML?

  - by ProfK

  I have a small, custom crafted HTML report, not using any reporting engine, for various reasons. The client's layout is quite handy, as each report section fits on its own page, so I have one div for each page, with a CSS class of .page, setting A4 dimensions with margin, and a header image. Each 'page' also has a small header table just under the header image, and a section heading label. Now, some sections threaten to overflow their page, and I'm looking at ways to handle this. One clumsy approach is to include a second page for those sections that might overflow, and delete these pages before rendering if they are empty. If I do this, how can I 'tell' content on one page to overflow into the next page? The report is finished and a once off effort, so I'm not keen to convert it into a SSRS or Telerik report just to achieve this paging.

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