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• Make browser to go back by reloading page 1st and then scrolling it back again too

  - by Marco Demaio

  EXPLAINING WHAT I'M TRYING TO SOLVE: I have a webpage (file_list.php) showing a list of files, and next to each file there is a button to delete it. When user press the DELETE button close to a certain file name, the browser goes to a script called delete_file.php that deletes the file and then it tells browser to go back to the file_list.php delete_file.php uses a simple header("Location: file_list.php”); to go back to file_list.php When browser goes back to file_list.php it reloads the page, but it DOES NOT scroll it back again to where the user was before. So let's say the user scrolled the files list and deleted the last file, when the browser shows again the page file_list.php it won't be scrolled to the bottom of the page again. THE WORKAROUND I CAME OUT WITH: I found a strange way to work around this, basically instead of using header("Location: file_list.php”); in delete_file.php I simply use a javascript call window.history.go(-1). This workaround works perfectly when user is in session (simply using PHP session_start function): the browser RELOADS the file_list.php page and then scrolls it also bask to where it was before. But if the user is NOT in session the browser scrolls the page but IT DOES NOT RELOAD IT before, so the user would still see the file he deleted in the file list. THE QUESTIONS Do you know how to reproduce the behavior of the browser when goes back being in session even if we are not in session? Do you know a way out of this, even another way of solving this matter? Thanks! *I know I could use AJAX to delete the file so I would not have to go every time to delete_file.php, but this is not the answer*.

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• Got a table of people, who I want to link to each other, many-to-many, with the links being bidirect

  - by dflock

  Imagine you live in very simplified example land - and imagine that you've got a table of people in your MySQL database: create table person ( person_id int, name text ) select * from person; +-------------------------------+ | person_id | name | +-------------------------------+ | 1 | Alice | | 2 | Bob | | 3 | Carol | +-------------------------------+ and these people need to collaborate/work together, so you've got a link table which links one person record to another: create table person__person ( person__person_id int, person_id int, other_person_id int ) This setup means that links between people are uni-directional - i.e. Alice can link to Bob, without Bob linking to Alice and, even worse, Alice can link to Bob and Bob can link to Alice at the same time, in two separate link records. As these links represent working relationships, in the real world they're all two-way mutual relationships. The following are all possible in this setup: select * from person__person; +---------------------+-----------+--------------------+ | person__person_id | person_id | other_person_id | +---------------------+-----------+--------------------+ | 1 | 1 | 2 | | 2 | 2 | 1 | | 3 | 2 | 2 | | 4 | 3 | 1 | +---------------------+-----------+--------------------+ For example, with person__person_id = 4 above, when you view Carol's (person_id = 3) profile, you should see a relationship with Alice (person_id = 1) and when you view Alice's profile, you should see a relationship with Carol, even though the link goes the other way. I realize that I can do union and distinct queries and whatnot to present the relationships as mutual in the UI, but is there a better way? I've got a feeling that there is a better way, one where this issue would neatly melt away by setting up the database properly, but I can't see it. Anyone got a better idea?

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• Why is it assumed that send may return with less than requested data transmitted on a blocking socke

  - by Ernelli

  The standard method to send data on a stream socket has always been to call send with a chunk of data to write, check the return value to see if all data was sent and then keep calling send again until the whole message has been accepted. For example this is a simple example of a common scheme: int send_all(int sock, unsigned char *buffer, int len) { int nsent; while(len 0) { nsent = send(sock, buffer, len, 0); if(nsent == -1) // error return -1; buffer += nsent; len -= nsent; } return 0; // ok, all data sent } Even the BSD manpage mentions that ...If no messages space is available at the socket to hold the message to be transmitted, then send() normally blocks... Which indicates that we should assume that send may return without sending all data. Now I find this rather broken but even W. Richard Stevens assumes this in his standard reference book about network programming, not in the beginning chapters, but the more advanced examples uses his own writen (write all data) function instead of calling write. Now I consider this still to be more or less broken, since if send is not able to transmit all data or accept the data in the underlying buffer and the socket is blocking, then send should block and return when the whole send request has been accepted. I mean, in the code example above, what will happen if send returns with less data sent is that it will be called right again with a new request. What has changed since last call? At max a few hundred CPU cycles have passed so the buffer is still full. If send now accepts the data why could'nt it accept it before? Otherwise we will end upp with an inefficient loop where we are trying to send data on a socket that cannot accept data and keep trying, or else? So it seems like the workaround, if needed, results in heavily inefficient code and in those circumstances blocking sockets should be avoided at all an non blocking sockets together with select should be used instead.

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• JavaScript keeps returning ambigious error

  - by Erx_VB.NExT.Coder

  this is my function (with other lines ive tried/abandoned)... function DoClicked(eNumber) { //obj.style = 'bgcolor: maroon'; var eid = 'cat' + eNumber; //$get(obj).style.backgroundColor = 'maroon'; //var nObj = $get(obj); var nObj = document.getElementById(eid) //alert(nObj.getAttribute("style")); nObj.style.backgroundColor = 'Maroon'; alert(nObj.style.backgroundColor); //nObj.setAttribute("style", "backgroundcolor: Maroon"); }; This error keeps getting returned even after the last line in the function runs: Microsoft JScript runtime error: Sys.ArgumentUndefinedException: Value cannot be undefined. Parameter name: method this function is called with an "OnSuccess" set in my Ajax.ActionLink call (ASP.NET MVC)... anyone any ideas on this? i have these referenced... even when i remove the 'debug' versions for normal versions, i still get an error but the error just has much less information and says 'b' is undefined (probably a ms js library internal variable)... <script src="../../Scripts/MicrosoftAjax.debug.js" type="text/javascript"></script> <script src="../../Scripts/MicrosoftMvcValidation.debug.js" type="text/javascript"></script> <script src="../../Scripts/MicrosoftMvcAjax.debug.js" type="text/javascript"></script> <script src="../../Scripts/jquery-1.4.1.js" type="text/javascript"></script> also, this is how i am calling the actionlink method: Ajax.ActionLink(item.CategoryName, "SubCategoryList", "Home", New With {.CategoryID = item.CategoryID}, New AjaxOptions With {.UpdateTargetId = "SubCat", .HttpMethod = "Post", .OnSuccess = "DoClicked(" & item.CategoryID.ToString & ")"}, New With {.id = "cat" & item.CategoryID.ToString})

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• Any book on designing and implementing a CRPG engine?

  - by Fabzter

  Hi! First, let me tell you, I am not really interested in making my own rpg engine (at least not in the near future, hehe), but I do feel like I want to understand the internals of how a rpg engine works. Why? Well, because I like to read about programming and design, It keeps me motivated and excited, and because I know I will learn a lot, for, even when I have been programming for some years now, I never stop considering myself an ignorant... there are simply SO many things involving a game engine (specially rpg ones, like branching storylines, and items and economics!) I'm eager to know. I've been searching (and thus, finding) lots of info online, but it is never focused in what I'm interested (most of it talks about the mathematics and AI algorithms implementation, which I know quite well), which is the design of overall structure, patterns, scripting engine, decision engine... damn, so many things I can't even imagine, since I've never done any game programming. I hope you know have an idea of how I feel, and how I want to learn for the sake of learning, and why would I want you to tell me if you know if there exist books touching the topics that interest me the most.

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• Debug NAudio MP3 reading difference?

  - by Conrad Albrecht

  My code using NAudio to read one particular MP3 gets different results than several other commercial apps. Specifically: My NAudio-based code finds ~1.4 sec of silence at the beginning of this MP3 before "audible audio" (a drum pickup) starts, whereas other apps (Windows Media Player, RealPlayer, WavePad) show ~2.5 sec of silence before that same drum pickup. The particular MP3 is "Like A Rolling Stone" downloaded from Amazon.com. Tested several other MP3s and none show any similar difference between my code and other apps. Most MP3s don't start with such a long silence so I suspect that's the source of the difference. Debugging problems: I can't actually find a way to even prove that the other apps are right and NAudio/me is wrong, i.e. to compare block-by-block my code's results to a "known good reference implementation"; therefore I can't even precisely define the "error" I need to debug. Since my code reads thousands of samples during those 1.4 sec with no obvious errors, I can't think how to narrow down where/when in the input stream to look for a bug. The heart of the NAudio code is a P/Invoke call to acmStreamConvert(), which is a Windows "black box" call which I can't think how to error-check. Can anyone think of any tricks/techniques to debug this?

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• Why does ActiveMQ hold messages that should be deleted from Topic?

  - by rauch

  I use ActiveMQ as Notification System(Pub/Sub model). On server: if any changes of data occur, Server send this updated data (File) to Topic using BlobMessages. There are few Clients, that subscribe on this Topic and get updated File if it exsist in Topic. The problem is that all of BlobMessages, that were sent to Topic, are hold by ActiveMQ all time. this.producer = new ProducerTool.Builder("tcp://localhost:61616?jms.blobTransferPolicy.uploadUrl=http://localhost:8161/fileserver/", "ServerProdTopic").topic(true) .transacted(false).durable(false).timeToLive(10000L).build(); this.consumer = new ConsumerTool.Builder("tcp://localhost:61616", "ServerConsTopic").topic(true) .transacted(false).durable(false).build(); consumer.setMessageListener(this); The File is sent: connection = createConnection(); session = createSession(connection); producer = createProducer(session); BlobMessage blobMsg = ((ActiveMQSession) session).createBlobMessage(resource); blobMsg.setStringProperty("sourceName", resource.getName()); producer.send(blobMsg); if (transacted) { System.out.println("Producer Committing..."); session.commit(); } Where createProducer is: protected Connection createConnection() throws JMSException, Exception { ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url); //connectionFactory.getBlobTransferPolicy().setUploadUrl("http://localhost:8161/fileserver/"); Connection connection = connectionFactory.createConnection(); connection.start(); ((ActiveMQConnection) connection).setCopyMessageOnSend(false); return connection; } All, that could be useful I set as need: Session.AUTO_ACKNOWLEDGE; Non-Durable Subscription; TimeToLive = 9000; JMSDeliveryMode = Non-Persistent; What I have at runtime: in ActiveMQ directory: ~/apache-activemq-5.3.0/webapps/fileserver/ tere are all File, that where delivered and not delivered to Subscribers. Why? Sometimes Server send Big Files about 1 GB....And even this Files are hold at that directory, Even after stopping Subscribers(Clients), Publisher(Server) and ActiveMQ Broker.

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• is there a Universal Model for languages?

  - by Smandoli

  Many programming languages share generic and even fairly universal features. For example, if you compared Java, VB6, .NET, PHP, Python, then you would find common functions such as control structures, numeric and string manipulation, etc. What has been done to define these features at a meta-language (or language-agnostic) level? UML offers a descriptive reference of software in every aspect, but the real-world focus seems to be data processes. Is UML relevant? I'm not asking "Why we don't have a single language that replaces the current plethora." We need many different tools (at least in this eon). I'm not asking that all languages fit a template -- assembly vs. compiled languages are different enough to make that unfeasible (and some folks call HTML a language, though I wouldn't). Any attempt would start with a properly narrow scope. In line with this, I wouldn't expect the model to cover even a small selection with full validity. I would expect however that such a model could be used to transpose from one language to another (with limited goals -- think jist translation).

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• Problem with ActionScript 3.0 button to URL and root movieclip

  - by aarontb

  Okay, so, here's what the problem is. I'm creating a flash site with each page being it's own movieclip and Scene 1 being the menu and other things that stay on the site. I've created a MovieClip called 'HowWorksScene'. The movieclip has 2 buttons that link out to different URLs, however, I'm sure that when 1 of the button scripts work, the same script will work for the other...so here's the problem that I'm having with the Button stop(); VidDemo_btn.addEventListener(MouseEvent.CLICK, video); function video(event:MouseEvent):void { var link:URLRequest = new URLRequest('www.youtube.com'); navigateToURL(link); } Problem is that I cannot GET to that frame to even determine an error. The problem preventing me from getting to this point is a call function. In the "HomePage" movieclip, when the button is pressed to go to the next scene, "Homepage" fades out and flys left then the next frame is 1 frame but activates the next movieclipe "HowWorksScene"...but without errors, it simply goes to frame 17 of "Homepage". I've tried doing _root.gotoAndPlay(17); but get an undefined error. So, I guess my question is: What is the BEST way to direct from within a movieclip to a frame in the parent Scene? I've even tried using gotoAndPlay(17, "Scene 1"); And that still did not work. Please let me know ASAP!

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• MySQL BinLog Statement Retrieval

  - by Jonathon

  I have seven 1G MySQL binlog files that I have to use to retrieve some "lost" information. I only need to get certain INSERT statements from the log (ex. where the statement starts with "INSERT INTO table SET field1="). If I just run a mysqlbinlog (even if per database and with using --short-form), I get a text file that is several hundred megabytes, which makes it almost impossible to then parse with any other program. Is there a way to just retrieve certain sql statements from the log? I don't need any of the ancillary information (timestamps, autoincrement #s, etc.). I just need a list of sql statements that match a certain string. Ideally, I would like to have a text file that just lists those sql statements, such as: INSERT INTO table SET field1='a'; INSERT INTO table SET field1='tommy'; INSERT INTO table SET field1='2'; I could get that by running mysqlbinlog to a text file and then parsing the results based upon a string, but the text file is way too big. It just times out any script I run and even makes it impossible to open in a text editor. Thanks for your help in advance.

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• Solution for cleaning an image cache directory on the SD card

  - by synic

  I've got an app that is heavily based on remote images. They are usually displayed alongside some data in a ListView. A lot of these images are new, and a lot of the old ones will never be seen again. I'm currently storing all of these images on the SD card in a custom cache directory (ala evancharlton's magnatune app). I noticed that after about 10 days, the directory totals ~30MB. This is quite a bit more than I expected, and it leads me to believe that I need to come up with a good solution for cleaning out old files... and I just can't think of a great one. Maybe you can help. These are the ideas that I've had: Delete old files. When the app starts, start a background thread, and delete all files older than X days. This seems to pose a problem, though, in that, if the user actively uses the app, this could make the device sluggish if there are hundreds of files to delete. After creating the files on the SD card, call new File("/path/to/file").deleteOnExit(); This will cause all files to be deleted when the VM exits (I don't even know if this method works on Android). This is acceptable, because, even though the files need to be cached for the session, they don't need to be cached for the next session. It seems like this will also slow the device down if there are a lot of files to be deleted when the VM exits. Delete old files, up to a max number of files. Same as #1, but only delete N number of files at a time. I don't really like this idea, and if the user was very active, it may never be able to catch up and keep the cache directory clean. That's about all I've got. Any suggestions would be appreciated.

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• backbone js or knockout js as a web framework with jquery mobile

  - by Dan

  without trying to cause a mass discussion I would like some advice from the fellow users of stack overflow. I am about to start building a mobile website that gets it data from JSON that comes from a PHP rest api. I have looked into different mobile frameworks and feel that JQM will work best for us as we have the knowledge of jQuery even though a little large. Currently at work however we are using jQuery for all our sites and realise that now we are building a mobile website I need to think about javascript frameworks to move us onto a more MV* approach, which I understand the benefits of and will bring much needed structure to this mobile site and future web applications we may bring. I have made a comparision table where I have managed to bring the selection down to 2 - backbone and knockout. I have been looking around the web and it seems that there is more support for backbone in general and maybe even more support for backbone with JQM. http://jquerymobile.com/test/docs/pages/backbone-require.html One thing I have noticed however is that backbone doesnt support view bindings (declarative approach) whereas knockout does - is this a massive bonus? one of the main reasons for using a mv* for us is to get more structure - so I would like to use the library that will intergrate best with jQuery and especially jQuery mobile. neither of them seem to have that similar syntax... Thanks

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• Best terminal environment for Cygwin/Windows?

  - by Anders Sandvig

  Today I run Cygwin with rxvt using the following startup line: rxvt -bg black -sl 8192 -fg white -sr -g 150x56 -fn "Fixedsys" -e /usr/bin/bash --login -i This gives me a resizeable native Windows window which is much better than the standard "DOS box" the default cygwin.bat provides. However, the current configuration does have a couple of issues: I am not able to enter non-ASCII characters into the terminal window (i.e. æ, ø, å and Æ, Ø, Å, which I use semi-frequently. In fact, the terminal will not even accept them when I paste them into the window. If I paste a string like "bølle" (Norwegian for "bulley"), all I get is "blle". I am not able to render UTF-8 character, they only show as ?, even if they are supported by the font (i.e. when rendering the same characters in ISO-8859-1 they show just fine.). I am running English Windows Vista with locale and keyboard layout set to Norwegian (ISO-8859-1 character set?), but I've had the exact same issue on Windows 2000 and XP. Anyone knows how to fix this (i.e. a better way to configure rxvt)? Apart from the issues mentioned above, I'm very happy with rxvt, so if I find a way to resolve them I'd like to continue using it. However, if the issues are not (easily) solvable, are the any other good terminal solutions for Cygwin? Update The solution provided by Andy and Mattias (editing the .inputrc file) did solve the input problem, but output rendering is still an issue. Output is fine when I render in ISO-8859-1, but when using UTF-8 I only get ? for non-ASCII characters. This behavior is consistent between rxvt, urxvt (under Cygwin XFree X Server), mintty and PuttyCyg. Is there a similar configuration file where output encoding can be set (i.e. the equivalent of setting output locale on a Linux system)?

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• eclipse django using wrong settings.py in pythonpath

  - by user1290264

  I have pydev/django installed in eclipse, and it runs fine. However, after adding a second django project to eclipse and running the server ('http://127.0.0.1:8000') the pythonpath seems to be stuck on project2 even when I run project1. As a summary, I have two django projects: project1, project2. When I run the django server for project1 I get: Validating models... 0 errors found Django version 1.5, using settings 'project1.settings' Development server is running at 'http://127.0.0.1:8000/' Quit the server with CTRL-BREAK. The above seems to suggest that django is using the correct settings file; however, when I go to 'http://127.0.0.1:8000/' it displays the urls from project2. Also, if I go to 'http://127.0.0.1:8000/admin' the models are getting pulled from the sqlite.db file in project2 as well. I've even tried removing project2 from eclipse entirely and now at 'http://127.0.0.1:8000/admin' I get this error: Python Path: ['C:\Users\Brad\workspaces\In Progress\project2', 'C:\Users\Brad\workspaces\In Progress\project2', 'C:\Python27\DLLs', 'C:\Python27\lib', 'C:\Python27\lib\plat-win', 'C:\Python27\lib\lib-tk', 'C:\Python27', 'C:\Python27\lib\site-packages', 'C:\Windows\system32\python27.zip'] If I run the server on a different port with project1 the path seems to be fine: runserver 7000 --noreload Then 'http://127.0.0.1:7000/' uses project1's paths, but it doesn't seem like I should have to do this. Note: I have setup the run configurations as correctly as I know how. In the main tab, the project and main module both point to the correct project (project1), and the "PYTHONPATH that will be used in the run:" includes project1. Also, I have cleared my browser history, cookies, and everything that chrome would let me delete.

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• What is the best software design to use in this scenario

  - by domdefelice

  I need to generate HTML snippets using jQuery. The creation of those snippets depends on some data. The data is stored server-side, in session (where PHP is used). At the moment I achieved this - retrieving the data from the server via AJAX in form of JSON - and building the snippets via specific javascript functions that read those data The problem is that the complexity of the data is getting bigger and hence the serialization into JSON is getting even more difficult since I can't do it automatically. I can't do it automatically because some information are sensible so I generate a "stripped" version to send to the client. I know it is difficult to understand without any code to read, but I am hoping this is a common scenario and would be glad for any tip, suggestion or even design-pattern you can give me. Should I store both a complete and a stripped data on the server and then use some library to automatically generate the JSON from the stripped data? But this also means I have to get the two data synchronized. Or maybe I could move the logic server-side, this way avoiding sending the data. But this means sending javascript code (since I rely on jQuery). Maybe not a good idea. Feel free to ask me more details if this is not clear. Thank you for any help

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• How to safely let users submit custom themes/plugins for a Rails app

  - by Brian Armstrong

  In my rails app I'd like to let users submit custom "themes" to display data in various ways. I think they can get the data in the view using API calls and I can create an authentication mechanism for this. Also an authenticated API to save data. So this is probably safe. But i'm struggling with the best way to let users upload/submit their own code for the theme. I want this to work sort of like Wordpress themes/plugins where people can upload the thing. But there are some security risks. For example, if I take the uploaded "theme" a user submits and put it in it's own directory somewhere inside the rails app, what are the risks of this? If the user inserts any rails executable code in their theme, even though it's the view they have full access at that point to all the models, everyone's data, etc. Even from other users. So that is not good. I need some way to let the uploaded themes exist in a sandbox of the rails app, but I haven't seen a good way to do this. Any ideas?

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• Noob question about a statement in a Java program

  - by happysoul

  I am beginner to java and was trying out this code puzzle from the book head first java which I solved as follows and got the output correct :D class DrumKit { boolean topHat=true; boolean snare=true; void playSnare() { System.out.println("bang bang ba-bang"); } void playTopHat() { System.out.println("ding ding da-ding"); } } public class DrumKitTestDriver { public static void main(String[] args) { DrumKit d =new DrumKit(); if(d.snare==true) { d.playSnare(); } d.playTopHat(); } } Output is :: bang bang ba-bang ding ding da-ding Now the problem is that in that code puzzle one code snippet is left that I did not include..it's as follows d.snare=false; Even though I did not write it , I got the output like the book. I am wondering why is there need for us to set it's value as false even when we know the code is gonna run without it too !?? I am wondering what the coder had in mind ..I mean what could be the possible future use and motive behind doing this ? I am sorry if it's a dumb question. I just wanna know why or why not to include that particular statement ? It's not like there's a loop or something that we need to come out of. Why is that statement there ?

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• Best way to display a "High Scores" Results

  - by George

  First, I would to thank everyone for all the help they provide via this website. It has gotten me to the point of almost being able to release my first iPhone app! Okay, so the last part I have is this: I have a game that allows users to save their high scores. I update a plist file which contains the users Name, Level, and score. Now I want to create a screen that will display the top 20 high scores. What would be the best way to do this? At first I thought possibly creating an HTML file with this info but am not even sure if that is possible. I would need to read the plist file, and then write it out as HTML. Is this possible? To write a file out as HTML? Or an even better question, is there a better way? Thanks in advance for any and all help! Geo...

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• What's the Matlab equivalent of NULL, when it's calling COM/ActiveX methods?

  - by David M

  Hi, I maintain a program which can be automated via COM. Generally customers use VBS to do their scripting, but we have a couple of customers who use Matlab's ActiveX support and are having trouble calling COM object methods with a NULL parameter. They've asked how they do this in Matlab - and I've been scouring Mathworks' COM/ActiveX documentation for a day or so now and can't figure it out. Their example code might look something like this: function do_something() OurAppInstance = actxserver('Foo.Application'); OurAppInstance.Method('Hello', NULL) end where NULL is where in another language, we'd write NULL or nil or Nothing, or, of course, pass in an object. The problem is this is optional (and these are implemented as optional parameters in most, but not all, cases) - these methods expect to get NULL quite often. They tell me they've tried [] (which from my reading seemed the most likely) as well as '', Nothing, 'Nothing', None, Null, and 0. I have no idea how many of those are even valid Matlab keywords - certainly none work in this case. Can anyone help? What's Matlab's syntax for a null pointer / object for use as a COM method parameter? Update: Thanks for all the replies so far! Unfortunately, none of the answers seem to work, not even libpointer. The error is the same in all cases: Error: Type mismatch, argument 2 This parameter in the COM type library is described in RIDL as: HRESULT _stdcall OurMethod([in] BSTR strParamOne, [in, optional] OurCoClass* oParamTwo, [out, retval] VARIANT_BOOL* bResult); The coclass in question implements a single interface descending from IDispatch.

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• Why is this CHOICE element not getting assigned in my SharePoint Field definition schema?

  - by ccornet

  I defined a new field of the type "Choice" for my web application. It will serve basically as a pseudo-lookup as its contents are defined by the value of a Text field in a list. It is initialized with a dummy choice to begin with (I'm under the impression a choice field needs at least one choice when defined), which is replaced with a real choice later on. But for some reason, this dummy choice is never actually added to the choices! Below is the XML Schema for the field in question. <Field ID="{ALICEH-ASFA-KEGU-IDLISTED}" Name="ddlSystems" Group="Lookup Columns" DisplayName="ddlSystems" Type="Choice" Sealed="FALSE" ReadOnly="FALSE" Hidden="FALSE" FillInChoice="TRUE" DisplaceOnUpgrade="TRUE"> <CHOICES> <CHOICE>BLANULL</CHOICE> </CHOICES> <Default>BLANULL</Default> </Field> Initially, I used a default choice of (a single space), but I changed it to BLANULL so that I can parse an actual word instead of a veritably empty string. Now, even after having uninstalled and reinstalled the feature with this field, I have a choice field that has (still a single space) as the only choice. Even more perplexing, BLANULL is actually listed for the default value in both the UI and the object model! What is causing this problem, and how can I circumvent it so that I don't have to manually set this dummy value each time?

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• getting proxies of the correct type in nhibernate

  - by Nir

  I have a problem with uninitialized proxies in nhibernate The Domain Model Let's say I have two parallel class hierarchies: Animal, Dog, Cat and AnimalOwner, DogOwner, CatOwner where Dog and Cat both inherit from Animal and DogOwner and CatOwner both inherit from AnimalOwner. AnimalOwner has a reference of type Animal called OwnedAnimal. Here are the classes in the example: public abstract class Animal { // some properties } public class Dog : Animal { // some more properties } public class Cat : Animal { // some more properties } public class AnimalOwner { public virtual Animal OwnedAnimal {get;set;} // more properties... } public class DogOwner : AnimalOwner { // even more properties } public class CatOwner : AnimalOwner { // even more properties } The classes have proper nhibernate mapping, all properties are persistent and everything that can be lazy loaded is lazy loaded. The application business logic only let you to set a Dog in a DogOwner and a Cat in a CatOwner. The Problem I have code like this: public void ProcessDogOwner(DogOwner owner) { Dog dog = (Dog)owner.OwnedAnimal; .... } This method can be called by many diffrent methods, in most cases the dog is already in memory and everything is ok, but rarely the dog isn't already in memory - in this case I get an nhibernate "uninitialized proxy" but the cast throws an exception because nhibernate genrates a proxy for Animal and not for Dog. I understand that this is how nhibernate works, but I need to know the type without loading the object - or, more correctly I need the uninitialized proxy to be a proxy of Cat or Dog and not a proxy of Animal. Constraints I can't change the domain model, the model is handed to me by another department, I tried to get them to change the model and failed. The actual model is much more complicated then the example and the classes have many references between them, using eager loading or adding joins to the queries is out of the question for performance reasons. I have full control of the source code, the hbm mapping and the database schema and I can change them any way I want (as long as I don't change the relationships between the model classes). I have many methods like the one in the example and I don't want to modify all of them. Thanks, Nir

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• CheckBox won't toggle in Android ListView with focusable="false"

  - by user3563124

  I'm creating a ListView with a custom Adapter for displaying my entries. Each row contains a checkbox, and my adapter contains the following code: CheckBox cb = (CheckBox) v.findViewById(R.id.item_sold); cb.setChecked(p.isSold); setupCheckboxListener(cb, v, position); ... private void setupCheckboxListener(CheckBox check, final View v, final int position) { check.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { CheckBox cb = (CheckBox) v; if (cb.isChecked()) { System.out.println("Should become false!"); cb.setChecked(false); } else { System.out.println("Should become true!"); cb.setChecked(true); } } }); My row XML file includes the following: <CheckBox android:id="@+id/item_sold" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.10" android:layout_gravity="center" android:gravity="center" android:focusable="false" android:clickable="false"/> But anytime I press one of the checkboxes, check.isChecked() returns true, even if the box is unchecked. I even checked to make sure that the checkboxes were distinct and weren't picking up just the last value/etc. Setting up the listeners inline instead of in a method doesn't seem to help, either. It's literally just the isChecked() condition that isn't working appropriately - it seems to always give me the inverse value. Setting an onClick on the row is not acceptable in this case because I need to allow row selection for something else. What could be causing this issue?

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• Issue in creating Zip file using glob.glob

  - by infosyssec

  Hi, I am creating a Zip file from a folder (and subfolders). it works fine and creates a new .zip file also but I am having an issue while using glob.glob. It is reading all files from the desired folder (source folder) and writing to the new zip file but the problem is that it is, however, adding subdirectories, but not adding files form the subdirectories. I am giving user an option to select the filename and path as well as filetype also (Zip or Tar). I don;t get any problem while creating .tar.gz file, but when use creates .zip file, this problem comes across. Here is my code: for name in (Source_Dir): for name in glob.glob("/path/to/source/dir/*" ): myZip.write(name, os.path.basename(name), zipfile.ZIP_DEFLATED) myZip.close() Also, if I use code below: for dirpath, dirnames, filenames in os.walk(Source_Dir): myZip.write(os.path.join(dirpath, filename) os.path.basename(filename)) myZip.close() Now the 2nd code taks all files even if it inside the folder/ subfolders, creates a new .zip file and write to it without any directory strucure. It even does not take dir structure for main folder and simply write all files from main dir or subdir to that .zip file. Can anyone please help me or suggest me. I would prefer glob.glob rather than the 2nd option to use. Thanks in advance. Regards, Akash

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• forks in C - exercise

  - by Zka

  I try to repeat and learn more advanced uses and options when cutting trees with forks in the jungle of C. But foolishly I find an example which should be very easy as I have worked with forks before and even written some code, but i can't understand it fully. Here comes : main() { if (fork() == 0) { if (fork() == 0) { printf("3"); } else if ((wait(NULL)) > 0) { printf("2"); } } else { if (fork() == 0) { printf("1"); exit(0); } if (fork() == 0) { printf("4"); } } printf("0"); return 0; } Possible solutions are : 3201040 3104200 1040302 4321000 4030201 1403020 where 2, 5 and 6 are correct answers. First of all, shouldn't there be four zeroes in the output? Second... How does one come to the solution at all? Been doing this on paper for almost an hour and I'm not even close to understanding why the given solution are more correct than the false ones (except for nr3 as it can't end with 2 since a 0 must follow). Anyone with his forks in check who can offer some good explanation?

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• Inserting script from jQuery / Javascript

  - by Colby77

  Hi, I'm trying to insert reCaptcha code into my page from jQuery, but it doesn't work. Here is my code: $("#button").click(function() { $("#loginBox").html($.getRecaptcha()); }) When I try the following, my code doesn't even run. I think it's trying to execute instead of rendering it. $.getRecaptcha = function(){ return '<script type="text/javascript"' + 'src="http://api.recaptcha.net/challenge?' + 'k=6Ld3iAsAAAAAAGyX8QT244GagPEpCDSD-96o4gEi"></script>'; } With the following, the code runs, but when I click to #button I get an empty, full white browser window. $.getRecaptcha = function(){ var captcha = $("<script>") .attr("type", "text/javascript") .attr("src", "http://api.recaptcha.net/challenge?k=6Ld3iAsAAAAAAGyX8QT244GagPEpCDSD-96o4gEi"); return captcha; } I don't want to insert reCaptcha code into my html from the beginning, because it downloads the reCaptcha content from the reCaptcha server even if my users don't want to use it. I could set the visibility of the container that holds the reCaptcha to invisible (display: none;), but it will dowload the content irrespectively of it. I can insert the "noScript" code that reCaptcha gives us, but it doesn't work either, because it can spot that the browser allow javascript but I use noScript. Any suggestions? (I know I put my public reCaptcha key into the code, but it is just for testing purposes, and you could get it from my html or javascript code anyway)

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