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  • Using sub filters/queries in Google App Engine

    - by fredrik
    Hi, I'm trying to use figure out how to sub query a query that uses a filter. From what I've figured out so far while using .filter() it changes the original query, that leads to a second .filter() would also have to match the first filter. I would like to make something like this: modules = data.Modules.all().filter('page = ', page.key()) modules.filter('name = ', 'Test') modules.filter('name = ', 'Test2') I can't get the "Test2" filter to work. The only solution I have at the moment is to make all new queries. data.Modules.all().filter('page = ', page.key()).filter('name = ', "Test").get() data.Modules.all().filter('page = ', page.key()).filter('name = ', "Test2").get() Or write the same as an GQL. But for me it seams quite stupid way to go. I've looked at using ancestors, but I don't quite understand it and honestly don't know if that's the way to go. Any ideas? ..fredrik

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  • Safest way to copy a file

    - by aron
    Hello, I need to merg two PDF files. However sometimes a file might be locked up I wrote this code, but I'm wondering if it's not the smartest solution: private static int FILE_LOCKED_WAIT_PERIOD = 1000; while (true) { // If the file is in use, IOException will be thrown. // If file is not permitted to be opened because of Permission // Restrictions, UnauthorizedAccessException will be thrown. // For all other, Use normal Exception. try { inputDocument1 = PdfReader.Open(fileToMerge, PdfDocumentOpenMode.Import); break; } catch (IOException) { Thread.Sleep(FILE_LOCKED_WAIT_PERIOD); } catch (UnauthorizedAccessException) { Thread.Sleep(FILE_LOCKED_WAIT_PERIOD); } catch (Exception) { Thread.Sleep(FILE_LOCKED_WAIT_PERIOD); } }

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  • Switching from web to desktop development

    - by Dziamid
    Being a web developer (php, symfony, doctrine) for 2 years now, I was recently asked by a friend to come up with a desktop solution. So I developed a project, installed a LAMP on his machine and he is mostly happy using it now. But I'm not. It just doesn't seem right to wait for a server response from a localhost. Obviously php isn't suited for desktop development. So, my question is: what language \ framework would you advice a php programmer if he was going to develop a desktop application (something that you can install, that has it's own gui, but utilizes the similar concepts of web apps: css, javascript, orm). I would like to bring up Python as a possible answer to my question. Does anyone have an experience of developing a desktop app with Python, utilizing an ORM and(or) HTML-based GUI?

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  • Web site aggregation with twitter widget SSL issue

    - by AB
    Hello! I'm seeking for solution how to isolate widget included by partial to main site. Issue appear when user access site with https. Ie 6,7 shows security confirmation dialog (part of website resources are not in secure zone). First of all I download twitter widget on our side, also I download all CSS and pictures. Then I patched widget JS to point onto downloaded resources. But still has not luck with security warning :( I guess the reason of this issue is AJAX request to twitter, but there is no idea how to sole it. (Just to create some kind of proxy on our side). Thank you for attention.

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  • Good implementations of reinforced learning?

    - by Paperino
    For an ai-class project I need to implement a reinforcement learning algorithm which beats a simple game of tetris. The game is written in Java and we have the source code. I know the basics of reinforcement learning theory but was wondering if anyone in the SO community had hands on experience with this type of thing. What would your recommended readings be for an implementation of reinforced learning in a tetris game? Are there any good open source projects that accomplish similar things that would be worth checking out? Thanks in advanced Edit: The more specific the better, but general resources about the subject are welcomed. Follow up: Thought it would be nice if I posted a followup. Here's the solution (code and writeup) I ended up with for any future students :). Paper / Code

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  • will paginate, nested routes, ruby, rails

    - by Sam
    I'm trying to get will paginate to link to my nested route instead of the regular posts variable. I know I'm supposed to pass some params to paginate but I don't know how to pass them. Basically there is an array stored in @posts and the other param paginate has access to is category_id. The nested route is /category/1/posts but hitting next and previous on will paginate returns a url like this posts?page=1&category_id=7. <%= will_paginate @most_recent_posts "What do I do here?" %> This is the result of Yannis's answer: In your controller you can do: @posts = @category.posts.paginate And in your view: <%= will_paginate(@post) %> Doing this comes up with the following URL posts?page=2&post_category_id=athlete_management routes.rb #there are more routes but these are the relevant ones map.resources :posts map.resources :post_categories, :has_many => :posts solution map.resources :post_categories do |post_category| post_category.resources :posts end map.resources :posts Had to declare the resource after the block Thanks stephen!

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  • How do I prevent jagged edges alongside the surfaces of my 3d model?

    - by badcodenotreat
    Lets say I've implemented in openGL a crude model viewer with shading which renders a series of blocks, such that I have something that looks like this. http://i.imgur.com/TsF7K.jpg Whenever I rotate my model to the side, it causes an unwanted jagged effect along any surface with a steep viewing angle. http://i.imgur.com/Bgl9o.jpg I'm pretty sure this is due to the polygon offset I used to prevent z-fighting between the model and the wireframe, however I'm not able to find the factor/unit parameters in openGL which prevent this unwanted effect. what are the best values of factor and unit for glPolygonOffset to prevent this? would implementing anti-aliasing alleviate the problem? is the trade off in performance trivial/significant? is this perhaps a shading issue? should i try a solution along this line of thought?

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  • Image Drawing on UIView

    - by user1180261
    I'm trying to create an application where I can draw a lot of pictures at a specific point (determined for each image) on one view. I have a coordinates where I need draw a picture, width and height of it For example: I have 2 billion jpeg's images. for each images I have a specific origin point and size. In 1 second I need draw on view 20-50 images in specific point. I have already tryid solve that in the next way: UIGraphicsBeginImageContextWithOptions(self.previewScreen.bounds.size, YES, 0); [self.previewScreen.image drawAtPoint:CGPointMake(0, 0)]; [image drawAtPoint:CGPointMake(nRect.left, nRect.top)]; UIImage *imagew = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [self.previewScreen setImage:imagew]; but in this solution I have a very big latency with displaying images and big CPU usage WBR Maxim Tartachnik

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  • need thoughts on my interview question - .net, c#

    - by uno
    One of the questions I was asked was that I have a database table with following columns pid - unique identifier orderid - varchar(20) documentid - int documentpath - varchar(250) currentLocation - varchar(250) newlocation - varchar(250) status - varchar(15) I have to write a c# app to move the files from currentlocation to newlocation and update status column as either 'SUCCESS' or 'FAILURE'. This was my answer Create a List of all the records using linq Create a command object which would be perform moving files using foreach, invoke a delegate to move the files - use endinvoke to capture any exception and update the db accordingly I was told that command pattern and delegate did not fit the bill here - i was aksed to think and implement a more favorable GoF pattern. Not sure what they were looking for - In this day and age, do candidates keep a lot of info on head as one always has google to find any answer and come up with solution.

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  • Problem facing fetching contacts from yahoo using open Social API

    - by user324929
    Hello there I was trying to get contact list from yahoo for POC. It was documented that the there is need to send a GET request to the URL with the user's ID and returns the contact list in XML format. I tried the same but facing the authentication message 401 from browser, normal console java application and from jsp too I guess I must try it using the open social API package. Can anybody please guide or suggest the solution for this problem if possible please post any code sample for any similar application in JAVA as I found most samples are unclear and in JSON only. Thank You

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  • What are the CS fundamentals behind package/dependency management?

    - by Frep D-Oronge
    Often I hear about situations where companies are developing extensable in house software (the dreaded enterprise 'framework') which is supposed to support multiple 'plugins' from diffirent teams. Usually this ends up being a half baked solution that does not really work due to compatibility prolems between addins, or between addins and the framework itself. Usually this means QA have to 'rubber stamp' a global set of versions accross all plugins, or more usually plugins are released and stuff breaks in nasty ways. This problem has been solved before however, for example the package management systems like apt for debian linux. I suspect that the reason it works is that it is built from the start on a known 'Computer Science-y' concept. My question is what is it?

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  • asp.net InsertCommand to return latest insert ID

    - by Stijn Van Loo
    Dear all, I'm unable to retrieve the latest inserted id from my SQL Server 2000 db using a typed dataset in asp.NET I have created a tableadapter and I ticked the "Refresh datatable" and "Generate Insert, Update and Delete statements". This auto-generates the Fill and GetData methods, and the Insert, Update, Select and Delete statements. I have tried every possible solution in this thread http://forums.asp.net/t/990365.aspx but I'm still unsuccesfull, it always returns 1(=number of affected rows). I do not want to create a seperate insert method as the auto-generated insertCommand perfectly suits my needs. As suggested in the thread above, I have tried to update the InsertCommand SQL syntax to add SELECT SCOPY_IDENTITY() or something similar, I have tried to add a parameter of type ReturnValue, but all I get is the number of affected rows. Does anyone has a different take on this? Thanks in advance! Stijn

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  • How can I pop a view from a UINavigationController and replace it with another in one operation?

    - by Matt Brandt
    I have an application where I need to remove one view from the stack of a UINavigationController and replace it with another. The situation is that the first view creates an editable item and then replaces itself with an editor for the item. When I do the obvious solution within the first view: MyEditViewController *mevc = [[MYEditViewController alloc] initWithGizmo: gizmo]; [self retain]; [self.navigationController popViewControllerAnimated: NO]; [self.navigationController pushViewController: mevc animated: YES]; [self release]; I get very strange behavior. Usually the editor view will appear, but if I try to use the back button on the nav bar I get extra screens, some blank, and some just screwed up. The title becomes random too. It is like the nav stack is completely hosed. What would be a better approach to this problem? Thanks, Matt

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  • Entity Framework - MySQL - Datetime format issue

    - by effkay
    Hello; I have a simple table with few date fields. Whenever I run following query: var docs = ( from d in base.EntityDataContext.document_reviews select d ).ToList(); I get following exception: Unable to convert MySQL date/time value to System.DateTime. MySql.Data.Types.MySqlConversionException: Unable to convert MySQL date/time value to System.DateTime The document reviews table has two date/time fields. One of them is nullable. I have tried placing following in connection string: Allow Zero Datetime=true; But I am still getting exception. Anyone with a solution?

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  • How to store a user's password to another web application

    - by Horace Loeb
    I'm building a web application that shows users interesting visualizations of their Gmail activity (who they're emailing the most, etc). Obviously the user needs to give me his Gmail password to use the application, and I'm wondering how I should store it: Store the Gmail password in plaintext. Risky! Don't store the Gmail password at all; force the user to enter it every time he wants to sync data. Potentially inconvenient! Encrypt the Gmail password before storing it. The user's password to my application is the key. Something like (3) seems best, but with (3) I can only sync data when the user logs in (since I won't know his password to my application at any other time), which isn't ideal. I'd prefer a Mint.com-like solution whereby the user can click a button to sync data from Gmail at any time without re-entering his password (any idea how Mint accomplishes this without storing your banking passwords?)

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  • WIX/DTF - How do I elevate deffered managed custom actions?

    - by Jarrod
    We are working on creating an installer using WIX. We have a couple of custom actions that are going to require elevation to run on Vista. Our MSI obviously elevates itself, because I get a UAC prompt and it writes keys to HKLM. Our managed DTF custom actions are apparently not running elevated. If I start the MSI from an elevated command prompt, the installation runs fine. The only workaround I have seen suggested (link) is to use another exe with a manifest as a bootstrapper to run the MSI. This is not a good solution, as it doesn't allow the user to modify the installation by selecting "Change" from the Add/Remove programs dialog. Our install has multiple features that can be customized, so we want this functionality. Does anybody know how to do this?

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  • Whats up with cross site Scripting (getJSON) and flickr example

    - by Bernhard
    In past i had read the documentation about getJSON and there is an example with a flickr photo api. (the example with the [pussy]cats :-)). No I ask myself why is it possible, to access flickr directly with this example. Ive tried this by store this code on my local machine - it works but if I use a local copy of jquery i just get an error in firebug like this $ is not defined myurl/test.html Line 11 Does anybody of you have a solution for this paradox thing? This is the documentation url HTTP:api.jquery.com/jQuery.getJSON/ The example isn´t also not working if I store the HTTP:code.jquery.com/jquery-latest.js in my local jquery file. I also dont understand why the request isnt´s visible in Firebug Console Thank you in advance Bernhard

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  • Recording user data for heatmap with javascript

    - by Hanpan
    Hi, I was wondering how sites such as crazyegg.com store user click data during a session. Obviously there is some underlying script which is storing each clicks data, but how is that data then populated into a database? It seems to me the simple solution would be to send data via AJAX but when you consider that it's almost impossible to get a cross browser page unload function setup, I'm wondering if there is perhaps some other more advanced way of getting metric data. I even saw a site which records each mouse movement and I am guessing they are definitely not sending that data to a database on each mouse move event. So, in a nutshell, what kind of technology would I need in order to monitor user activity on my site and then store this information in order to create metric data? I am not looking to recreate GA, I'm just very interested to know how this sort of thing is done. Thanks in advance

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  • How to setup RAM disk drive using python or WMI?

    - by Ming Xie
    Hi, The background of my question is associated with Tesseract, the free OCR engine (1985-1995 by HP, now hosting in Google). It specifically requires an input file and an output file; the argument only takes filename (not stream / binary string), so in order to use the wrapper API such as pytesser and / or python-tesser.py, the OCR temp files must be created. I, however, have a lot of images need to OCR; frequent disk write and remove is inevitable (and of course the performance hit). The only choice I could think about is changing the wrapper class and point the temp file to RAM disk, which bring this problem up. If you have better solution, please let me know. Thanks a lot. -M

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  • How to secure Java webservices with login and session handling

    - by hubertg
    I'd like to secure my (Java metro) webservice with a login. Here's how I'm planning to do that: Steps required when calling a webservice method are: call login(user,pwd), receive a session token 1.1 remember the token call servicemethod (token, arg1, arg2...) webservice checks if the token is known, if not throw exception otherwise proceed logout or timeout after x time periods of inactivity my questions: 1. what's your opinion on this approach? does it make sense? 2. are there any libraries which take the burden of writing a session handling (maybe with database persistence to survive app restarts) (the solution should be simple and easily usable with Java and .NET clients) thanks!

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  • iPhone: Howto get notified when an UIView becomes visible

    - by arne_
    Is there a way to get a notification, a callback or some other means to call a method whenever a UIView becomes visible for the user, i.e. when a UIScrollview is the superview of some UIViews, and the ViewController of such a UIView shall get notified when its view is now visible to the user? I am aware of the possible, but not so elegant solution of checking to which position the ScrollView scrolled (via UIScrollViewDelegate-methods) and compute if either one of the subviews is visible... But I'm looking for a more universal way of doing this.

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  • iPhone: NSOperationQueue running operations serially

    - by Greg Maletic
    I have a singleton NSOperationQueue that handles all of my network requests. I'm noticing, however, that when I have one particularly long operation running (this particular operation takes at least 25 seconds), my other operations don't run until it completes. maxConcurrentOperationCount is set to NSOperationQueueDefaultMaxConcurrentOperationCount, so I don't believe that's the issue. Any reason why this would be happening? Besides spawning multiple NSOperationQueues (a solution that I'm not sure would work, nor am I sure it's a good idea), what's the best way to fix this problem? Thanks.

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  • How to secure licensekey generation

    - by Jakob Gade
    Scenario, simplified for brevity: A developer creates an application for a customer. The customer sells this app to end-users. The app requires a license key to run, and this key is generated by the customer for each end-user with a simple tool created by the developer. The license key contains an expiry date for the license and is encrypted so the end-user can’t tamper with it. The problem here is that the developer (or anybody who has a copy of the license key generator) can easily create valid license keys. Should this generator fall into the wrong hands, it could spell disaster for the customers business. Ideally, the customer would have to use a password to create new license keys. And this password would be unknown to the developer, and somehow baked into the decryption algorithm in the application so it will fail if an attempt to use an unauthorized key is made. How would you implement a solution for this problem that is both transparent and secure?

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  • How to write content in a text file at the end of each line

    - by saravanan
    Hi, I am having one text file which contain following kind of data. "3P","Smith","Richard","3 Point Promotions","3P","[email protected]","IDA","Yes",,,,0,4,5,83.33,10, "A1","Ernest","Amy","TAKE 1 Promotional Products","LCOOK","[email protected]","IDA","Yes",,,,0,6,7,,0, "A2","Derek","Eaton","Advertising Edge Promotions","AE","[email protected]","IDA","Yes",,,,0,8,8,,10, "AAA","Abercrombie","Jerry","AAA Specialty Wholesale Inc","AAA","[email protected]","IDA","Yes",,,,0,9,9,,10, "AAP","Halberstam","Mendy","All About Promotions","AAP","[email protected]","IDA","Yes",,,,0,10,10,,12, Each of them are separate line.Now i want add another column in each like this "3P","Smith","Richard","3 Point Promotions","3P","[email protected]","IDA","Yes",,,,0,4,5,83.33,10,**96** "A1","Ernest","Amy","TAKE 1 Promotional Products","LCOOK","[email protected]","IDA","Yes",,,,0,6,7,,0,**97** "A2","Derek","Eaton","Advertising Edge Promotions","AE","[email protected]","IDA","Yes",,,,0,8,8,,10,**98** "AAA","Abercrombie","Jerry","AAA Specialty Wholesale Inc","AAA","[email protected]","IDA","Yes",,,,0,9,9,,10,**99** "AAP","Halberstam","Mendy","All About Promotions","AAP","[email protected]","IDA","Yes",,,,0,10,10,,12,**100** How i read content in line by line.And also how to write another value in same text file at each line.Please send solution for this problem.I am waiting for your reply.Thanks for reply. -Saravanan

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  • Classical Round Table algorithm?

    - by user1795954
    Coins with different value are spread in circle around a round table . We can choose any coin such that for any two adjacent pair of coins , atleast one must be selected (both maybe selected too) . In such condition we have to find minimum possible value of coins selected . I have to respect time complexity so instead of using naive recursive bruteforce , i tried doing it using dynamic programming . But i get Wrong Answer - my algorithm is incorrect . If someone could suggest an algorithm to do it dynamically , i could code myself in c++ . Also maximum number of coins is 10^6 , so i think O(n) solution exists .

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