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• Bi-directional communication with 1 socket - how to deal with collisions?

  - by Zwei Steinen

  Hi, I have one app. that consists of "Manager" and "Worker". Currently, the worker always initiates the connection, says something to the manager, and the manager will send the response. Since there is a LOT of communication between the Manager and the Worker, I'm considering to have a socket open between the two and do the communication. I'm also hoping to initiate the interaction from both sides - enabling the manager to say something to the worker whenever it wants. However, I'm a little confused as to how to deal with "collisions". Say, the manager decides to say something to the worker, and at the same time the worker decides to say something to the manager. What will happen? How should such situation be handled? P.S. I plan to use Netty for the actual implementation. Thank you very much in advance!

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• Range validation not working properly in MVC3

  - by Colin Desmond

  I am generating data validation javascript in an Asp.Net MVC 3 application with the following code [DisplayName("Latitude Degrees")] [Range(0, 90, ErrorMessage = "Latitude degrees must be between {1} and {2}")] public Int32? LatitudeDegrees { get; set; } on a view model. When it was MVC2 this worked just fine, if I entered a value outside of 0-90 in the textbox I got the validation warnings. Since I moved the application to MVC 3, whenever I put any value into the texbox, legal or illegal I get the validation error appear next to it. I have EnableClientValidation set to true and UseUnobtrusiveJavascript is off (nothing in web.config or the views to turn it on).

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• Entity Framework 4.1 (Code First) audit column

  - by Ken Pespisa

  I'm using Entity Framework 4.1 with a Code-First approach on an ASP.NET MVC site Say I have an entity named Profile that keeps track of a user's favorite book, and I want to track when the user updates their favorite book. UPDATED: Using the class below as an example, I want to set the FavoriteBookLastUpdated property to the current date whenever the value of the FavoriteBook property changes. public class Profile { public int Id { get; set; } public string Name { get; set; } public string FavoriteBook { get; set; } public DateTime? FavoriteBookLastUpdated { get; set; } } Right now I just update that field, if appropriate, in the controller's Edit action before calling the DBContext's SaveChanges() method. Is there a way I can put that logic in my model somehow? I'd prefer not to use triggers on the database side.

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• Programming languages & proof of concepts

  - by Mike

  There are plenty of programming languages out there, as you all may know. I am primarily looking for a list of programming languages WITH some very neat proof of concepts. I would really like to learn a new language, but whenever I dive into something new and popular, it isn't what I expected. Any tutorial out there will give you code, small examples, but won't show you the true power of the language. I am looking for examples that run entirely on the language that it is exemplifying. For example, If I said C#, I could possibly show you a complete C# app with backend queries, reports, tables, all with a nice interface. It would be completely reliant on the language that is provided, so no supporting languages. I understand that most languages are integrated with other languages in order to provide a richer application. Any links, charts, websites that may reflect this request is appreciated.

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• Using GET instead of POST to delete data behind authenticated pages

  - by Matt Spradley

  I know you should use POST whenever data will be modified on a public website. There are several reasons including the fact that search engines will follow all the links and modify the data. My question is do you think it is OK to use GET behind authenticated pages in something like an admin interface? One example would be a list of products with a delete link on each row. Since the only way to get to the page is if you are logged in, is there any harm in just using a link with the product ID in the query string?

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• Event trigger print using VC++

  - by santhosh kumar

  I have requirement to print log data continuously whenever an event trigger (Without showing print dialog, using default printer). Event may occur twice a second or minit or hour. Also i don`t bother about printer status. example out of paper, communication problem. Printer should not leave empty page. Example event 1 have 4 lines of data to print. While printing event 2, printer should print continuously instead of fetching next paper. My development environment VC++ and MFC.

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• Tomcat myfaces dynamic source files

  - by Gerrie

  Hi, I'm going to try and make as much sense as possible here. We are working on a myfaces 2 app in tomcat. On our local dev machines, whenever we want to change one of our xhtml files, we have to stop the server, deploy and then start the server back up. This is cumbersome and makes making small changes to the view tedious. I tried changing the deployed xhtml file in tomcat, but the server only picks up the new change after a restart. Is there any type of config in myfaces or tomcat I can do to force the rebuilding of these source xhtml's every time?

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• Check if Rhythmbox is running via Python

  - by cschol

  I am trying to extract information from Rhythmbox via dbus, but I only want to do so, if Rhythmbox is running. Is there a way to check if Rhythmbox is running via Python without starting it if it is not running? Whenever I invoke the dbus code like this: bus = dbus.Bus() obj = bus.get_object("org.gnome.Rhythmbox", "/org/gnome/Rhythmbox/Shell") iface = dbus.Interface(obj, "org.gnome.Rhythmbox.Shell) and Rhythmbox is not running, it then starts it. Can I check via dbus if Rhythmbox is running without actually starting it? Or is there any other way, other than parsing the list of currently running processes, to do so?

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• Write large PDFs with Java sequentially

  - by Benjamin Muschko

  I am looking for a Java library that let's you write large PDFs sequentially with a minimum amount of memory. Most of the libraries I had a look at has to build up the document in memory first before you can actually write it. The problem I have to deal with are OutOfMemoryErrors. It would be great if I could flush the writer programmatically whenever needed e.g. for each page. Does anyone have any recommendations? I need something with a license along the lines of the LGPL (so not the GPL or the Affero GPL that iText uses).

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• Reading a file used by another process

  - by Tophe

  I know this has been up for discussion but I can't find an answer to my specific problem. I am monitoring a text file that is being written to by a server program. Every time the file is changed the content will be outputted to a window in my program. The problem is of course, that I can't use the Streamreader on the file as it is being "used by another process". Also setting up a Filestream with ReadWrite won't do any good since I cannot control the process that is using the file. However... You CAN open the file in notepad, so somehow it must be possible to access it even though the server is using it. Is there a good way around this? Should I monitor the file, make a temp copy of it when it changes, read the temp copy and the delete the temp copy. I need to get hold of the text in the file whenever the server changes it.

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• Consolidate loan, purchase & sale tables into one transaction table.

  - by Frank Computer

  INFORMIX-SE with ISQL 7.3: I have separate tables for Loan, Purchase & Sales transactions. Each tables rows are joined to their respective customer rows by: customer.id [serial] = loan.foreign_id [integer]; = purchase.foreign_id [integer]; = sale.foreign_id [integer]; I would like to consolidate the three tables into one table called "transaction", where a column: transaction.trx_type char(1) {L=Loan, P=Purchase, S=Sale} identifies the transaction type. Each transaction will be assigned a unique transaction number [serial]. Is this a good idea or is it better to keep them in separate tables? Storage space is not a concern, I think it would be easier programming & user-wise to have all types of transactions under one table, whenever possible. This implies denormalization.

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• Domain Model and Contracts

  - by devoured elysium

  I am modelling a DVD Rental Store: A Client gives its clientNumber to the System. The System checks whenever the given clientNumber is valid. The Client gives the name of the DVD he wants to rent. ... n. ...I will later have to form an association between a new instance of "RentDVD" class concept to the current Client c. My Domain Model is something like: I've made the Contract for the first and second operations as: Preconditions: none Postconditions: there exists a Client c such that c.clientNumber = clientNumber. Now, I don't know if I should form an association between this Client c and the DVDStore(that I intend to use as front-end). If I don't make the association, how will I later be able to "reference" this same Client? Should I be making an association between Client and a different concept? Thanks

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• Saving contents of ApplicationState in ASP.Net (MVC)

  - by Saqib

  I have an internal app used to edit XML files on disk. The XML files are loaded into an object model which is stored in ApplicationState. I need to save this data. The one option is to do this every time the user changes some data. However, this seems a bit inefficient - writing the data out to disk each time a change is made. Instead, is it possible to be notified whenever the user closes their browser, plus just before the web server exits? Thus, the data would be saved each time a session ends, plus when the computer shuts down, etc. I thought that Application_End(), Application_Error() and Session_End() in Global.asax would provide this, but these methods don't seem to be called.

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• Selenium fails to find component after dom update (reRender)

  - by Bozho

  I'm testing a richfaces application with selenium. It works fine, unless I use reRender. (for those unfamiliar with richfaces - whenever an ajax request finished, parts of the DOM are updated/chagned/removed). So, after a reRender selenium (the IDE at least) fails to locate the elements which were within the reRendered area. Both FireBug and WebDeveloper locate the elements, and on "view source" the elements are there. So, is there a way to tell selenium to update its DOM "knowledge" with the latest changes? Firefox 3.5.6, latest version of Selenium IDE.

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• MPI C fprintf() output not showing up if the process hangs on MPI_Recv

  - by Karolis

  I'm writing an MPI C program. I have troubles debugging it, because whenever I use fprintf, like this: fprintf(stdout, "worker: %d", worker); if the program hangs, because of some blocking MPI_Recv, I can't see any output. I'm sure the line of code is reached, because I can put a return statement after the fprintf statement, in which case the process finishes execution and the output is printed. Any ideas, on how to print (see the output) even though the process gets blocked later by Recv? I hope this makes sense.

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• jQuery live() and stopPropagation() issue

  - by colourandcode

  I know that the live() event handles event bubbling different than all other jQuery events. jQuery recommends using 'return false', but in my case that doesn't work. The issue is: I have a DIV which contains an anchor tag. The DIV is bound using live(). Whenever I click the anchor tag inside this DIV it bubbles and calls the DIV's event. If I bind an event to that A tag which returns false it prevents the link from opening. Neither stopPropagation() or return false work in this case. Are there any other options? Ideally I'd like to keep the live() event around.

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• XCode, error: '_object' undeclared. Need some help solving this problem

  - by user309030

  I've got this code in my viewController.m file - (void)viewDidLoad { [super viewDidLoad]; GameLogic *_game = [[GameLogic alloc] init]; [_game initGame]; ....... } GameLogic is another class which I created. in the same viewController.m file, I have got another function - (void)test { if([_game returnElecFence]) { NSLog(@"YES"); } else { NSLog(@"NO"); } } Problem is, whenever the test function is called, I get an error saying '_game' undeclared. I tried putting the GameLogic init code in the .h file and on top of the @implementation to make it global but every method I tried resulted in a worse error. TIA to anyone who can suggest some ideas to clear this error up

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• Is there a way put a timestamp in the file header automatically when saving in Eclipse?

  - by George

  I am a PHP developer using Eclipse PDT. I would like a timestamp put automatically in my file headers whenever I save the file. Maybe as a replacement of a variable. Let's say I use this header in a file: /** * ${filename} * ${timestamp} */ When I save the file I would this to be replaced with: /** * Myfile.php * 4/20/2010 19:04 */ It would also be ok if there is a macro that would add a line at the very beginning of the file just containing a timestamp. Anybody with an idea? Regards, George

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• Generating random numbers in C

  - by moonstruckhorrors

  While searching for Tutorials on generating random numbers in C I found This Topic When I try to use the rand() function with parameters, I always get the random number generated 0. When I try to use the rand() function with parameters, I always get the value 41. And whenever I try to use arc4random() and random() functions, I get a LNK2019 error. Here's what I'm doing: #include <stdlib.h> int main() { int x; x = rand(6); printf("%d", x); } This code always generate 41. Where am I going wrong?? P.S. : I'm running Windows XP SP3 and using VS2010 Command Prompt as compiler. P.P.S. : Took me 15 minutes to learn how to format properly.

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• changing the saved contents of the model , edit model fileds once saved

  - by imran-glt

  hi I have extended the user model and added extra fields to it i.e "latitude" "longitude" and status and than save it. up to here it works fine. but i want to allow the user to change his/her "latitude" "longitude" whenever he/she needs like the hotmail and yahoo allows change account feature. in my case the user only wants to chage the latitude and longitude i tried it in this way but it didnt work. is this the right way to do it ...... or is there any other way to change the saved contents view.py def status_change(request): print "status_change function called" if request.method == "POST": rform = registerForm(data = request.POST) uform = UserForm(data = request.POST) if rform.is_valid(): user = uform.save() register = rform.save() register.user = user register.save() return render_to_response('home.html') else: rform = registerForm() return render_to_response('status_change.html',{'rform':rform})

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• drupal display submenu when parent has been selected

  - by Steven Cheng

  I've have a menu structure that has a depth of 3 levels on a drupal 6 CMS. When I click on a level 1 that has children, the level 2 menu items display fine. If the level 2 has children, it is not showing the level 3. If I check the expanded box the level 3 is displayed however, it displays all the time irrespective of the level 2 that has been selected. It seems to display whenever it's parent level 1 is selected. For further information, the menu items are a mixture of custom links & content links. i.e. Links I've enetered manually when creating the menu and others generated by when creating a node or view display. All I want is to show the children if there are any for the selected parent. Am I missing something fundamental here? Thanks Steve

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• directx audio video error message in debugmode

  - by clamp

  I have a c#/winforms application that uses directx to play some video and audio. whenever i start my application in debugmode i get this annoying message. i can click "continue" and everything seems to work fine. but i still want to get rid of this message. it does not show up in releasemode. Managed Debugging Assistant 'LoaderLock' has detected a problem in 'C:\pathtoexe.exe'. Additional Information: DLL 'C:\WINDOWS\assembly\GAC\Microsoft.DirectX.AudioVideoPlayback\1.0.2902.0__31bf3856ad364e35\Microsoft.DirectX.AudioVideoPlayback.dll' is attempting managed execution inside OS Loader lock. Do not attempt to run managed code inside a DllMain or image initialization function since doing so can cause the application to hang.

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• Java JAX-WS web-service client: how log request & response xml ?

  - by EugeneP

  I created an implementation of LoggingHandler that implements SOAPHandler It should log whenever handleMessage triggers. [ And it is never called in my case ] then : MyService service = new MyService(); MyServicePort port = service.getPortType(); now I try this: BindingProvider bindingProvider = (BindingProvider)port; bindingProvider.getBinding().getHandlerChain().add(new LoggingHandler()); I do not see any request / response xml though. Can you suggest any solution? Maybe there's other way to see output and request xml s ?

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• Is it possible to use an input within a <label> field?

  - by javanix

  I have a bunch of optional "write-in" values for a survey I'm working on. These are basically a radio button with a textbox within the answer field - the idea being that you would toggle the button and write something into the box. What I'd like to do is have the radio button toggled whenever a user clicks in the text field - this seems like a use-case that makes a lot of sense. Doing this: <input type="radio" id="radiobutton"><label for="radiobutton">Other: <input type="text" id="radiobutton_other"></label> works fine in Chrome (and I am guessing, other WebKit browsers as well), but there are weird selection issues in Firefox, so I'm assuming its a non-standard practice that I should stay away from. Is there a way to replicate this functionality without using JavaScript? I have an onclick function that will work, but we're trying to make our site usable for people who might have NoScript-type stuff running.

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• Programming issue while applying text to the third party control.

  - by srivatsa

  Hello I have used some third party controls in my windows application. There is a snippet which is being used in our code which re-initializes all the .text property of all the controls on the form. Everything works fine except for a control. This control is similar to the Windows Panel except for it has a dropdown appearance. This control has .Caption property instead of .Text property associated to it. This causes the problem whenever i use such codes foreach (Control oControl in this.Controls) { if (oControl is DropDownPanel) { { oControl.Text = rm_ResourceManager.GetString(oControl.Name + ".Text"); } } } The text is not set here for the DropDownPanel control in the above method. Since .Text is not available for DropDownPanel control. I cannot do the following either .. ((DropDownPanel)oControl).Caption = rm_ResourceManager.GetString(oControl.Name + ".Text"); Cos it shall throw exception if i try to cast oControl with that of DropDownPanel Any ideas how can i overcome such a condition. Regards

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