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• Differences between Ruby on Rails versions? Which should I use?

  - by Stephen Kellett

  I first used Rails when it was not so well known about, in 2005. I did some experimental work with it but it has languished due to lack of time. I'm now thinking of persuing the original idea again (with a new implementation) and when researching the latest Ruby and Ruby-on_Rails versions I see Ruby 1.9.2 and a Rails 3.0 beta. I haven't managed to find a concise description of the differences between any of the Rails major versions. I have looked on the official Rails site and a few others as well. No joy. Maybe i'm looking in the wrong places or for the wrong thing? My project isn't commercial in nature (it's a hobby thing) so the beta nature of Rails 3.0 doesn't put me off. I'd just like to know what the differences are. Can anyone explain please? If it makes any odds to the answer, I'll be working on a Linux box and/or a Windows box.

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• App like default photo browser in iphone ?

  - by goeff27

  Hi All i am developing a app which contains feature like default photo browser in iphone. I done some what similar to that. but after loading some(near about 10-15) images from remote server,i am receiving memory warning.My requirement is loading image one by one. For this, on scroll view i am putting an images and increasing the contentSize of scroll view. it will work fine. but due to memory warning app quite. Guys, any have any idea to approach for this feature which work similar to photo app without problem? thanks in advance .

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• Mac: How to see list of running network services?

  - by Jordan

  I am writing an application that needs to connect with a running network service on a Mac. Problem is, I have no idea what the service is called or even what port it uses. Is there a way to browse all running network services on my Mac? More info: I am connecting to a MIDI network session (found under 'Audio MIDI settings', present on all OSX installs). Am I correct in thinking this is a network service? I am planning to use NSNetServiceBrowser to locate all local computers running this service. (is this the best way to go about it?) Any help is much appreciated - thanks!

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• Selenium selected option in dropdown not displayed correctly

  - by luckyfool

  I have the following issue with Selenium Webdriver. There are two dropdown menus on a page i am testing "brand" and "items". The options of "items" depend on which brand you choose. I am trying to iterate through all possible choices and print brand-item pairs. I use two possible ways to pick an option from each dropdown menu Using Select(): def retryingSelectOption(name,n): result=False attempts=0 while attempts<5: try: element=Select(driver.find_element_by_name(name)) element.select_by_index(n) print element.all_selected_options[0].text result=True break except StaleElementReferenceException: pass attempts+=1 return result And using .click(): def retryingClickOption(name,n): result=False attempts=0 while attempts<5: try: driver.find_element_by_name(name).find_elements_by_tag_name("option")[n].click() result=True break except StaleElementReferenceException: pass attempts+=1 return result My problem is that at ,what seem to me as random moments (sometimes it works sometimes it does not), even though the above functions return True and printing out the selected option shows me the correct answer, the browser still displays the previous option. So basically Selenium tells me i have picked the right option but the browser displays the previous one.No idea what is wrong.

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• Changing a php "echoed" div attribute with php

  - by Zakaria

  Hi everybody, I'm using PHP to echo a content stored on my database. The content is a DIV carrying any type of data. The problem is that I don't know the ID and I have some problems with these DIVs if I try to display them more that once. So, the idea is to modify the DIV id each time I'd like to display them. Something like this: <?php modify_div_id($data,"id-456"); ?> Is there a solution for this problem? Thank you very much, regards.

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• javascript window.close, once again

  - by John Kjøller

  Im sorry if I havent done my research properly, - but couldnt find the answer I needed, so here goes: From my main page I open a new window using mainPlayer = window.open(); This window stays open until user clicks on a mainPlayer.close(); event. (or simply x closes the window) However, the idea is to make it possible to let the player keep playing, while browsing around the rest of the pages. But as soon as the user leaves the page that opened the mainPlayer window, the reference to the mainPlayer window seem to be lost. How do I, from the site's other pages, check if the mainPlayer window is open and close it on a click event? Thx John

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• AUTOMATING EXCEL MACRO USING PYTHON

  - by user324056

  Hi all, Here is my question... I am using python in Linux to automate an excel. I have finished writing data into excel by using pyexcelerator package. Now comes the real challenge. I have to add another tab to the existing sheet and that tab should contain the macro run in the first tab. All these things should be automated. I googled a lot and found win32come to do a job in macro, but that was only for windows. Anyone have any idea of how to do this, or can you guide me with few suggestions. Thanks in advance.

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• make a lazy var in scala

  - by ayvango

  Scala does not permit to create laze vars, only lazy vals. It make sense. But I've bumped on use case, where I'd like to have similar capability. I need a lazy variable holder. It may be assigned a value that should be calculated by time-consuming algorithm. But it may be later reassigned to another value and I'd like not to call first value calculation at all. Example assuming there is some magic var definition lazy var value : Int = _ val calc1 : () => Int = ... // some calculation val calc2 : () => Int = ... // other calculation value = calc1 value = calc2 val result : Int = value + 1 This piece of code should only call calc2(), not calc1 I have an idea how I can write this container with implicit conversions and and special container class. I'm curios if is there any embedded scala feature that doesn't require me write unnecessary code

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• RMI client tracking

  - by 0000

  I'm building a Client / Server app that has some very specific needs. There are 2 kinds of servers: the first kind provide most of the remote procedures and clients connect to these directly, while the second kind is a single server that should keep track of what users are active (clients) and how many servers of the first kind are active when a method is called. The main thing is that the monitor should ONLY connect to the servers and not the clients directly. My first idea was to implement a simple login/logout rmi method when a client connects/ disconnects and keep track of those in a list but the main problem is when a client or server end abnormally. For example, if a client goes offline abruptly the server should somehow be notified and update the list accordingly, while if a server goes out all of the clients connected to it should be marked as not active in the control server. Any ideas of how to implement this functionality would be appreciated.

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• Does the Quick Search Box search the database in Android? how?

  - by Praveen Chandrasekaran

  i have an database with the values of latitude and longitude. i would need to search those values depends on the user input. does the quick search box can search only the database value with the type-to-search feature. Else i want to put a separate EditText and then do the the search process.. if QSB is possible then how to do that? i want to search and drop a pin on the map.. please make a note of it. Any Idea, tutorial and sample codes are most thankful?

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• variable being weirdly deleted

  - by calccrypto

  im having a weird problem with one variable: its not being recognized but its still printing. i would post my code, but it is massive. the basic idea is: # pseudocode def function(stuff): <do stuff> # These are the only 2 conditions if tag == 3: pka = <a string> if tag == 4: pka = <a string> print pka # (1) print pka # (2) <do stuff not modifying pka> print pka # (3) if pka == 'RSA': <do stuff> elif pka == 'DSA': <do stuff> my code will error at (2). however, it will print out (1), (2), and (3), all of which are the same. is there any general explanation of why this is happening? if my code is really needed, i will post it, but otherwise, i would rather not due to its size update: now the code will error at the if statement after (3), saying UnboundLocalError: local variable 'pka' referenced before assignment even though (1),(2),(3) just printed

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• Maven best practice for generating artifacts for multiple environments [prod, test, dev] with CI/Hud

  - by jaguard

  I have a project that need to be deployed into multiple environments (prod, test, dev). The main differences mainly consist in configuration properties/files. My idea was to use profiles and overlays to copy/configure the specialized output. But I'm stuck into if I have to generate multiple artifacts with specialized classifiers (ex: "my-app-1.0-prod.zip/jar", "my-app-1.0-dev.zip/jar") or should I create multiple projects, one project for every environment ?! Should I use maven-assembly-plugin to generate multiple artifacts for every environment ? Anyway, I'll need to generate all them at once so it seams that the profiles does not fit ... still puzzled :( Any hints/examples/links will be more than welcomed. As a side issue, I'm also wondering how to achieve this in a CI Hudson/Bamboo to generate and deploy these generated artifacts for all the environments, to their proper servers (ex: using SCP Hudson plugin) ?

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• In grails how to insert additional parameters (from session) in all url's

  - by HeDinges

  I would like to add an additional parameter in my url, the use case is the following: When user do their login they also specify a 'company' name and from that moment on, all urls should map to: /$company/$controller/$action/$id The main idea is to have the current company name available in all url's, have it bookmarkable, and not to have to pass the company name everywhere as a request parameter. Also, once users are logged in it is acceptable to have the chosen company name in session scope. What is the right way of inserting this parameter in all our urls? I tried to modify my UrlMappings mapping, but I didn't found a way to insert the company name. Thanks,

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• Handling hundreds of dependencies with ant

  - by Roberto

  Hi guys, I have to refactor an ant xml file. Basicly I have one big task that checkouts (using cvs) a lot of dependencies, build them, and then copy all the jar/wsdl generated by building them to a directory that I specify. If one dependency version changes, I have to change the name in at least 3 places on the xml file (cvs checkout, build, copy). What I'd like to have is just a single place where I can specify my dependencies name, without having to search & replace the dependency name through the code. One of the problems is that the cvs project could be /path1/path2/project with tag=v12 but then the jars generated by the single project build could be several with different names, so it seems to be a bit complicated. Do you have any idea on how I can get this done?

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• Using LocationManager from another class than Main

  - by iphonePom

  Hi, i'm new here, i'm new in iphone development, i'm new in Objective-c and i'm new in engligh speaking, so don't hate me :P I'm creating an application that will use the location manager to display the distance between the own position and the positions of a list of shops, like AroundME. Now, i give the locationManager property to my main class and in the .m of that class, precisely in the viewDidLoad method, i make: [locationManager startUpdatingLocation]. It all works fine, but the problem is: i need to know my position in other classes than the main, but i don't think that is a good idea making [locationManager startUpdatingLocation] every time i need it, is not time overhead? The view of my main class is always below the others, so can i retrieve the updated location in my other classes? In what way? Creating another instance of my main class is not useful, i think, but the locationManager, once started, doesn't stop until my main class is released, isn't true? So i think that it is accessible in some way. Thanks for your attention and sorry for my awful english : )

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• XamlXmlReader.Read() does not yield matching XamlNodeType.StartObject and XamlNodeType.EndObject on

  - by Yuval

  Hi, I am trying to parse a valid xaml file using the XamlXmlReader. It looks like it is 'skipping' some elements when when Read() is called. for example on the following xaml snippet: <UserControl.Resources> <Converters:AnyDbTypeToDisplayNameConverter x:Key="anyDbTypeToDisplayNameConverter" /> </UserControl.Resources> when reading I first get a XamlNodeType.StartObject on UserControl.Resources - makes sense then another XamlNodeType.StartObject on Converters - also cool. but then i do not get a XamlNodeType.EndObject on the Converters and immediately jump to the next line and does not report a XamlNodeType.StartObject. Any Idea if this is working as design ? looks like a bug to me

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• Jquery: change event not triggered in IE

  - by Kenneth

  Hi, I have some code updating a dropdownlist, and then I fire the "change" event manually. It works like it should in firefox, opera and so on, but not in Internet Explorer. Any idea why? Code attached below. $(".bringFraktvalgRadio").click(function() { var selectedValue = $(".bringFraktvalgRadio:checked").val(); $("#<%= dropDeliveryOption.ClientID %> option[value=" + selectedValue + "]").attr("selected", true); $("#<%= dropDeliveryOption.ClientID %>").trigger("change"); });

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• How to hash and salt passwords

  - by Henrik Skogmo

  I realize that this topic have been brought up sometimes, but I find myself not entirely sure on the topic just yet. What I am wondering about how do you salt a hash and work with the salted hash? If the password is encrypted with a random generated salt, how can the we verify it when the user tries to authenticate? Do we need to store the generated hash in our database as well? Is there any specific way the salt preferably should be generated? Which encryption method is favored to be used? From what I hear sha256 is quite alright. And lastly, would it be an idea to have the hash "re-salted" when the user authenticates? Thank you!

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• Rails is not passing the "commit" button parameter

  - by Wayne M

  Reinstalling a Rails app on a new server. Part of the app can fork in one of two directions based on the button the user selects. This part isn't working, and when I look at the log I see the values that I gave the form, execept for the commit portion of the params hash. This seems to be why the app isn't working as expected (since there's nothing in params[:commit], but I have no idea why commit would not be passed in; the request is definitely a POST request, and all of the other parameters are there.

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• Get signature from a file

  - by Eugen

  I have a php code that gets a signature for a file using such a code shell_exec("openssl smime -binary -sign". " -certfile '".$keyPath."/WWDR.pem'". " -signer '".$keyPath."/passcertificate.pem'". " -inkey '".$keyPath."/passkey.pem'". " -in '".$this->workFolder."/manifest.json'". " -out '".$this->workFolder."/signature'". " -outform DER -passin pass:'$pass'"); I need to have a pure managed C# code that would the same? Any idea how to do this? Thx

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• C# cross class enum visibility - Possible?

  - by 537mfb

  so i have a class ClassA that contains an enum MyEnum, and a class ClassB that references that class (different Projects) and so in ClassB i have a using ClassA; clause and i can access that enum using something like MyEnum value = MyEnum.EnumValue; Now on a third project i have my Windows form and it has a clause like using ClassB; Now what can i add in ClassB to acess that enum on my windows Form? Is it even Possible? i would like to avoid having to add ClassA to my form just to access an enum. The idea is that ClassB is sort of a manager between my form and the functionality in ClassA - but i would like to get access to that enum as it makes a lot of tasks easier

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• How to write different implicit rules for different file names for GNU Make

  - by anupamsr

  Hi! I have a directory in which I keep adding different C++ source files, and generic Makefile to compile them. This is the content of the Makefile: .PHONY: all clean CXXFLAGS = -pipe -Wall -Wextra -Weffc++ -pedantic -ggdb SRCS = $(wildcard *.cxx) OBJS = $(patsubst %.cxx,%.out,$(SRCS)) all: $(OBJS) clean: rm -fv $(OBJS) %.out: %.cxx $(CXX) $(CXXFLAGS) $^ -o $@ NOTE: As is obvious from above, I am using *.out for executable file extensions (and not for object file). Also, there are some files which are compiled together: g++ file_main.cxx file.cxx -o file_main.out To compile such files, until now I have been adding explicit rules in the Makefile: file_main.out: file_main.cxx file.cxx file.out: file_main.out @echo "Skipping $@" But now my Makefile has a lot of explicit rules, and I would like to replace them with a simpler implicit rule. Any idea how to do it?

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• Problems with Ruby "||" "or"?

  - by Kevin

  Beginning Ruby Question: I'm trying to see if a string variable's contents is either "personal" "email" or "password". I'm trying: if params[:action] == "password" || "email" || "personal" foo else don't foo end But that doesn't work and returns strange results, and using IRB to play around with "or" statements I have no idea why the following happens: irb(main):040:0> a = "email" => "email" irb(main):041:0> a == "password" || "email" => "email" irb(main):042:0> a == "email" || "password" => true I just want something that if any of the 3 variables are true no matter what order they are in it returns true, if not it returns false. Anyone want to help this n00b out?

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• How to restore a hidden loadable kernel module from /sys/module and dealing with restoring holders_dir?

  - by user1833005

  I'm playing with kernel module hiding on Linux Kernel 3.x. I try to hide and recover the module from /sys/module. Everything works fine on Kernel Version 3.0 and 3.2.6, I can load and unload the module and hide and unhide it. When I'm unloading the module on kernel 3.6.6 I get the following error: rmmod: ERROR: could not open '/sys/module/xxx/holders': No such file or directory rmmod: ERROR: Module xxx is in use Has anybody an idea how I could restore of the module so that I am able to unload it without errors? Here is my code: /* hide from /sys/module */ kobject_del(&__this_module.mkobj.kobj); list_del(&__this_module.mkobj.kobj.entry); /* add to /sys/module */ kobject_add(&__this_module.mkobj.kobj,__this_module.mkobj.kobj.parent,"xxx"); Thank you four help :)

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• Is sending a PDF as encoded byte array in XML sensible

  - by simonjwoods

  Hi I am looking to return a PDF from a webservice call. (ATM, a custom proxy is required at the client-side) AFAICS, there are 2 ways of doing it a) Return the link to a web-accessible location b) Encode the PDF and include it in the XML In my circumstance, a) will require 2 trips from the client, the first to get the path and the second to get the file. However, wrt b), this link (http://www.coderanch.com/t/279020/Streams/java/wrting-bytearray-xml-file#1283263) suggests that it isn't a good idea to encode a PDF, though without explanation. I'd be grateful if someone would offer recommendations of the above (and potentially, other alternatives). Many thx Simon

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