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Articles indexed Monday April 19 2010

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  • firefox reading web page from local JS file -- access to restricted URI denied, code: 1012, nsresult

    - by macias
    My problem is -- I have a html file which is really JS program, which reads web pages and show them in customized manner (i.e. it displays the same content in a different way). Basically, I create XMLHttpRequest object and then req.open("GET", web_page_address, false); req.send(""); This gives me (in firefox) an error: Error: uncaught exception: [Exception... "Access to restricted URI denied" code: "1012" nsresult: "0x805303f4 (NS_ERROR_DOM_BAD_URI)" I already googled, and looked at SO but all other issues are very similar with those two exceptions: the file I open in firefox is a local file, opened directly in browser -- I don't have www server running at localhost I don't have any control over the web pages I am reading stuff from So, several solutions I've seen so far (like adding PHP proxy, changing the way external server sends data) cannot be applied here. What else can be done in such case? Another story is I am wondering if such strict security for directly local file has any sense. Thank you in advance for tips/links/etc. Have a nice day!

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  • Django admins disappearing from the admin index

    - by btol45
    We're running a Django website with rough 45 install Django admin classes. The handler is mod_fastcgi. Every once in a while about half the admins disappear from /admin/ screen. Touching the production.fcgi file restores everything to normal, but we have yet to determine the underling cause. Any thoughts on what the underlying issue might be?

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  • Ottawa Code Camp 2010 pictures

    - by guybarrette
    The Ottawa Code Camp IT Day 2010 took place over the weekend.  With about 130 attendees, it was a great success according to Jean-René Roy, one of the organizers. Pictures are available here var addthis_pub="guybarrette";

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  • Hyper-V + RRAS NAT + Port Forwarding + RDP, can I get it all working together?

    - by Tom Bull
    I am running a Windows 2008 R2 server with various services running natively and two virtualised servers running on Hyper-V. The hardware server, I'm going to call it REAL1, has one external NIC, to which I can assign any of the following IP addresses: 1.2.3.4, 1.2.3.5, 1.2.3.6, etc... I need to achieve the following: I would like to be able to connect to REAL1 via remote desktop (RDP / port 3389) on one IP address (say 1.2.3.4), but also to the virtualised servers (I'm going to call them VIRTUAL1 and VIRTUAL2) on the other available IP addresses (say 1.2.3.5 and 1.2.3.6). The easiest way of doing this is to connect the virtual servers directly to the external interface and assign them each their own IP address. REAL1 will have 1.2.3.4, VIRTUAL1 will have 1.2.3.5 and VIRTUAL2 will have 1.2.3.6. Unfortunately, although I don't directly manage the two virtual servers, I have responsibility for their security. I would like to have some kind of firewall between the virtual servers an the internet. I have tried running a virtual machine firewall, but have found the performance on Hyper-V pretty terrible. The alternative I am now trying is Routing and Remote Access (RRAS): I have set up a virtual network called 'Internal' and REAL1 has a virtual network adapter connected to this virtual network I have connected each of the virtual servers to this network too I have assigned each server static IP addresses on this virtual network (REAL1 has 10.1.1.1, VIRTUAL1 has 10.1.1.2 and VIRTUAL2 has 10.1.1.3) I have installed RRAS and set up a NAT. The external interface is the external NIC, the internal interface is the virtual NIC connected to the internal network I have assigned all the available external IP addresses to the external NIC on REAL1. The virtual servers have been set up appropriately such that their default gateway is pointing to 10.1.1.1 and they can both access externally. Success! The RRAS is routing packets. The problem I have is that when I try to port forward services from the external IP address on REAL1, it only works if there is not already a service bound to the port. Remote desktop 'greedily' binds to every available IP address on port 3389 on REAL1 so I can't selectively forward incoming traffic for 1.2.3.5:3389 to 10.1.1.2:3389. RRAS will allow me to set up this port forwarding, and no errors come up. It just doesn't work. So the question I have is: Is there a better way of doing this? Or at least is there a way of resolving the apparant conflict between RRAS and everything else on the physical server?

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  • How many reverse proxies (nginx, haproxy) is too many?

    - by Alysum
    I'm setting up a HA (high availability) cluster using nginx, haproxy & apache. I've been reading great things about nginx and haproxy. People tend to choose one or the other but I like both. Haproxy is more flexible for load balancing than nginx's simple round robin (even with the upstream-fair patch). But I'd like to keep nginx for redirecting non-https to https among other things right at the point of entry to the cluster. On the other hand, nginx is a lot faster for serving static contents and would reduce the load on the powerful apache which loves to eat a lot of RAM! Here is my planned setup: Load balancer: nginx listens on port 80/443 and proxy_forwards to haproxy on 8080 on the same server to load balance between the multiple nodes. Nodes: nginx on the node listens to requests coming from haproxy on 8080, if the content is static, serve it. But if it's a backend script (in my case PHP), proxy forward to apache2 on the same node server listenning on a different port number. Technically this setup works but my concerns are whether having the requests going through several proxies is going to slow down requests? Most of the requests will be PHP requests as the backends are services (which means groing from nginx - haproxy - nginx - apache). Thoughts? Cheers

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  • Permission denied error while import to remote repository via svn...

    - by Usman Ajmal
    Hi I am importing my project to another machine on my LAN to the directory: /srv/svn/repos/my-repo where my-repo was created via svnadmin create option The permissions of /srv/svn/repos/my-repo are drwxr-xr-x 6 svn svn 4096 2010-04-19 17:30 my-repo I executed following command to import myProject files to my-repo on remote system sudo svn import -m "First import" myProject svn+ssh://[email protected]/srv/svn/repos/my-repo This command started 'Adding' files but gave following error after 'Adding' 7 files svn: Can't open file '/srv/svn/repos/baltoros-valgrind/db/txn-current-lock': Permission denied Any idea whats going on...? Thanks a lot

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  • How to use an USB digitizer?

    - by Magnetic_dud
    Hello, i am in China now, and when i saw an USB digitizer (resistive), i bought it, thinking that i could be used as a mouse. When i connect it to my windows 7 rc1 laptop, the system properties says "pen input available" But, nothing happens when i touch the panel... i installed the bundled drivers, in chinese only, and NOT in unicode (so the text is garbled) When i install the driver, i get access to a special key on the tablet, "switch from pen input to mouse", and the driver will move the pointer according to the position on the tablet. (but no click) If i use the "pen mode", the computer will use a special chinese IME that is very awkard, i want to use the microsoft ime, and be able to draw/take notes on the screen There are "generic" drivers? Or just a plain mouse driver that will click when i press on the surface The tablet name is "qiancai"

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  • Could my forms be hacked.

    - by Mike Sandman
    Hi there, I posted a question yesterday, which I intend to get back to today however I wrote some JavaScript as a first line of prevention against XSS. However when testing this on my live server I catch some invalid input as the javascript catches the php section. My form uses post and php isn't in my form items (i haven't typed it in). Could this be picking up the form action or something? I'm baffeled, Any ideas Here is my code, it is triggered on the submit button. function validateForBadNess(){ var theShit = new Array("*","^", "$", "(",")","{", "}","[", "]","\", "|", "'","/","?",",","=","","gt","lt", "<","script","`","´","php"); var tagName = new Array(); tagName[0] = "input"; tagName[1] = "select"; tagName[2] = "textbox"; tagName[3] = "textarea"; for (ms=0;ms // loop through the elements of the form var formItems = document.getElementsByTagName(tagName[ms]); for (var xs=0;xs var thisString = formItems[xs].value; // loop through bad array for (zs in theShit){ //alert(thisString + " " + thisString.indexOf(theShit[zs])) if(thisString.indexOf(theShit[zs]) >= 0){ alert("Sorry but the following character: " + theShit[zs] + " is not permitted. Please omit it from your input.\nIf this is part of your password please contact us to heave your password reset.") return false; } } // loop for formitems } // tagName toop } // original condition }

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  • Auto-size zoom on Google Maps in java? (depending android screen resolution)

    - by poeschlorn
    Hey guys, i've got 2 GeoPoints given to show them on the map with markers... so far so good... how can I get the optimum zoom level for the MapController in order to focus the middle of both points, but also have them on the map. The whole thing should work at different screen resolutions. Sorry for asking that silly question, I know thats not very difficult, but at the moment my head is boiling :/

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  • Why do I have to specify pure virtual functions in the declaration of a derived class in Visual C++?

    - by neuviemeporte
    Given the base class A and the derived class B: class A { public: virtual void f() = 0; }; class B : public A { public: void g(); }; void B::g() { cout << "Yay!"; } void B::f() { cout << "Argh!"; } I get errors saying that f() is not declared in B while trying do define void B::f(). Do I have to declare f() explicitly in B? I think that if the interface changes I shouldn't have to correct the declarations in every single class deriving from it. Is there no way for B to get all the virtual functions' declarations from A automatically? EDIT: I found an article that says the inheritance of pure virtual functions is dependent on the compiler: http://www.objectmentor.com/resources/articles/abcpvf.pdf I'm using VC++2008, wonder if there's an option for this.

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  • How to use Page Object pattern with Cucumber and Webrat / Selenium?

    - by Will Sargent
    I'm looking at a cucumber test suite that is somewhat brittle right now; many small steps, and no knowledge of the page itself. I'd like to factor out the logic involved in the step definitions inside a series of Selenium PageObjects. As seen here. However, because I'm using Webrat and not Selenium, everything has to go through the Webrat model. So I cannot do class MyPage < Selenium::WebPage end because that adds a direct dependency. So I have to route everything through Webrat while still maintaining the Selenium Page object goodness. No documentation on this that I can see: if someone has anything on Webrat + PageModel I'd love to see it.

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  • Share c# class source code between several projects

    - by phq
    I have written a class that will handle internal logging in my application. Now I want to use this class in another new and totally separate project. I could simply copy the file to the new project folder, but I would like to only have one copy of it to maintain so that all changes in it will apply to both projects over time. I can use the "add existing file", but where do I put the file so that the next developer knows that it is required. I have once had a "shared" folder for this but one time that folder was not brought into the next development computer. What is the best way to organize this so that it makes most sense for new maintainers and minimizes the risk for broken links in projects.

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  • Is it possible to open a pipe-based filehandle which prints to a variable in perl?

    - by blackkettle
    Hi, I know I can do this, ------ open(F,"",\$var); print F "something cool"; close(F); print $var; ------ or this, open(F, "| ./prog1 | ./prog2 tmp.file"); print F "something cool"; close(F); but is it possible to combine these? The semantics of what I'd like to do should be clear from the following, open(F,"|./prog1 | ./prog2", \$var); print F "something cool"; close(F); print $var; however the above clearly won't work. A few minutes of experimenting and googling seems to indicate that this is not possible, but I'd like to know if I'm stuck with using the `` to capture the output.

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  • How should I add multi language support to my web app across PHP, JS and Template Files?

    - by Camsoft
    I'm building a website that needs to support different language translations. I have strings in PHP, JavaScript and Smarty Template files that need to translated. I want to use something like PHP's gettext() function and have a single language file for each locale. This is easy when the translatable strings are in the PHP files but I also have text in the Smarty Templates and JavaScript files that also need to be translated. I really want one single file that holds all the translatable strings. What is the best way to achieve this?

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  • How to avoid resending data on refresh in php

    - by Priyanka
    Hello.I have a page "index.php" where i have a link called "add_users.php".In "add_users.php",i accept user information and come back to the same page "index.php" where information comes through post action and gets inserted into the database.When i refresh the page orhit back button,resend box appears.I went through many solution where they asked me to create third page.I tried doing that as follows:After inserting values in database,I redirected ht page as header('Location:http://mysite.com/thankyou.php, and in thankyou.php I again redirected the page to index.php.But getting warning as Cannot modify header information - headers already sent by.... provide me a better solution. Thank You in advance.

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  • Is there anyway to close a StreamWriter without closing it's BaseStream?

    - by Binary Worrier
    My root problem is that when using calls Dispose on a StreamWriter, it also disposes the BaseStream (same problem with Close). I have a workaround for this, but as you can see it involves copying the stream. Is there any way to do this without copying the stream? The purpose of this is to get the contents of a string (originally read from a database) into a stream, so the stream can be read by a third party component. NB I cannot change the third party component. public System.IO.Stream CreateStream(string value) { var baseStream = new System.IO.MemoryStream(); var baseCopy = new System.IO.MemoryStream(); using (var writer = new System.IO.StreamWriter(baseStream, System.Text.Encoding.UTF8)) { writer.Write(value); writer.Flush(); baseStream.WriteTo(baseCopy); } baseCopy.Seek(0, System.IO.SeekOrigin.Begin); return baseCopy; } Used as public void Noddy() { System.IO.Stream myStream = CreateStream("The contents of this string are unimportant"); My3rdPartyComponent.ReadFromStream(myStream); } Ideally I'm looking for an imaginery method called BreakAssociationWithBaseStream, e.g. public System.IO.Stream CreateStream_Alternate(string value) { var baseStream = new System.IO.MemoryStream(); using (var writer = new System.IO.StreamWriter(baseStream, System.Text.Encoding.UTF8)) { writer.Write(value); writer.Flush(); writer.BreakAssociationWithBaseStream(); } return baseStream; }

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  • Computer science undergraduate project ideas

    - by Mehrdad Afshari
    Hopefully, I'm going to finish my undergraduate studies next semester and I'm thinking about the topic of my final project. And yes, I've read the questions with duplicate title. I'm asking this from a bit different viewpoint, so it's not an exact dupe. I've spent at least half of my life coding stuff in different languages and frameworks so I'm not looking at this project as a way to learn much about coding and preparing for real world apps or such. I've done lots of those already. But since I have to do it to complete my degree, I felt I should spend my time doing something useful instead of throwing the whole thing out. I'm planning to make it an open source project or a hosted Web app (depending on the type) if I can make a high quality thing out of it, so I decided to ask StackOverflow what could make a useful project. Situation I've plenty of freedom about the topic. They also require 30-40 pages of text describing the project. I have the following points in mind (the more satisfied, the better): Something useful for software development Something that benefits the community Having academic value is great Shouldn't take more than a month of development (I know I'm lazy). Shouldn't be related to advanced theoretical stuff (soft computing, fuzzy logic, neural networks, ...). I've been a business-oriented software developer. It should be software oriented. While I love hacking microcontrollers and other fun embedded electronic things, I'm not really good at soldering and things like that. I'm leaning toward a Web application (think StackOverflow, PasteBin, NerdDinner, things like those). Technology It's probably going to be done in .NET (C#, F#) and Windows platform. If I really like the project (cool low level hacking), I might actually slip to C/C++. But really, C# is what I'm efficient at. Ideas Programming language, parsing and compiler related stuff: Designing a domain specific programming language and compiler Templating language compiled to C# or IL Database tools and related code generation stuff Web related technologies: ASP.NET MVC View engine doing something cool (don't know what exactly...) Specific-purpose, small, fast ASP.NET-based Web framework Applications: Visual Studio plugin to integrate with Bazaar (it's too much work, I think). ASP.NET based, jQuery-powered issue tracker (and possibly, project lifecycle management as a whole - poor man's TFS) Others: Something related to GPGPU Looking forward for great ideas! Unfortunately, I can't help on a currently existing project. I need to start my own to prevent further problems (as it's an undergrad project, nevertheless).

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  • Syntax proposition

    - by Knowing me knowing you
    I wonder if syntax as follows would be helpful in your opinion as a code readability improvent and self-commenting of code: std::map<std::string name, std::vector<int> scores> myMap; In this example it clearly says and no other comment is needed, what for we are using myMap variable. Looking forward to your opinions.

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  • How to dynamically set validation messages on properties with a class validation attribute

    - by Dan
    I'm writing Validation attribute that sits on the class but inspects the properties of the class. I want it to set a validation message on each of the properties it finds to be invalid. How do I do this? This is what I have got so far: [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = true)] public class LinkedFieldValidationAttribute : ValidationAttribute { private readonly string[] _properiesToValidate; public LinkedFieldValidationAttribute(params string[] properiesToValidate) { _properiesToValidate = properiesToValidate; } public override bool IsValid(object value) { PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(value); foreach (var propertyName in _properiesToValidate) { var propertyValue = properties.Find(propertyName, false).GetValue(value); //if value is invalid add message from base } //return validity } }

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  • Entity Relationship Diagramming

    - by Ben Aston
    I'd like to improve my understanding of cardinality constraints in ER diagrams. I have two entities: User Location But, I want the relationship between these two entities to be many-to-many (a user can be in many locations and a location can have many users). To do this I need to introduce an association class UserLocation. Is it correct to say I now have 3 entities? If I were to draw an ER diagam of the above, would I draw in the UserLocation entity, and would the cardinality look like this? User 1 ------ * User Location * ------ 1 Location

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  • Beginner's guide for rails

    - by piemesons
    Hello friends i need a book/ tutorials for rails without using scoffold. All the books mentioned in the other questions are creating some depot application or etc using scaffold and then explaining things. I believe in the thing that creating big depot is worthless when you are not getting anything. All of my frnds are suggesting me to go for this pragmatic book. look i understand the book is good but i m not getting the proper things. I got the logic cause i m good in php doctrine. asp.net c c++ so i m getting the things but i m not feeling confident. I want to have a another book. Can anybody suggest me some other books. I m saying this cause it really feels good when u create a simple form and insert the values in db and u can retreive those values and MOST IMP you can explain the whole logic of the that small form application instaed of that colorfull Depot application in which things are done with scaffold and u r not getting the thing and u are confused abt the real picture.

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