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• How to use JNI, but only when available for current platform?

  - by Mecki

  What is the common way (or best practice) to optionally use JNI? E.g. I have a Java class and this class is 100% pure Java, so it can run on all platforms. However, on some platforms I'd like to speed up some heavy calculations using JNI - which works fine. Unfortunately I cannot support any existing Java platform in the world. So I guess it is fine to initially only support the big three: Linux, Windows, Mac OS X. So what I'd like to do is to use JNI on those three platforms and use the 100% pure Java version on all other platforms. Now I can think of various ways how to do that (loading class dynamically for example and either loading the JNI class or the pure Java one), but thinking that this is a common issue that thousands of projects had to solve in the past for sure, I'm really surprised to not find any documentation or references to the question how to solve this most elegantly or effectively.

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• sharpziplib - can you add a file without it copying the entire zip first?

  - by schmoopy

  Im trying to add an existing file to a .zip file using sharpziplib - problem is, the zip file is 1GB in size. When i try to add 1 small file (400k) sharpziplib creates a copy/temp of the orig zip file before adding the new file - this poses a problem when the amount of free disk space is less than 2x the zip file you are trying to update. for example: 1GB zip myfile.zip 1GB zip myfile.zip.tmp.293 ZipFile zf = new ZipFile(path); zf.BeginUpdate(); zf.Add(file); // Adding a 400k file here causes a 1GB temp file to be created zf.EndUpdate(); zf.Close(); Is there a more efficient way to do this? Thanks :-)

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• In C# is there a function that correlates sequential values on a IEnumerable

  - by Mike Q

  Hi all, I have a IEnumerable. I have a custom Interval class which just has two DateTimes inside it. I want to convert the IEnumerable to IEnumerable where n DateTimes would enumerate to n-1 Intervals. So if I had 1st Jan, 1st Feb and 1st Mar as the DateTime then I want two intervals out, 1st Jan/1st Feb and 1st Feb/1st March. Is there an existing C# Linq function that does this. Something like the below Correlate... IEnumerable<Interval> intervals = dttms.Correlate<DateTime, Interval>((dttm1, dttm2) => new Interval(dttm1, dttm2)); If not I'll just roll my own.

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• Fluent NHibernate ExportSchema without connexion string

  - by Vince

  Hi all, I want to propose to user a way to generate database table script creation. To do this for now i use NHibernate ExportSchema bases on a NHibernate configuration generated with Fluent NHibernate this way (during my ISessionFactory creation method): FluentConfiguration configuration = Fluently.Configure(); ... Mapping conf ... configuration.Database(fluentDatabaseProvider); this.nhibernateConfiguration = configuration.BuildConfiguration(); returnSF = configuration.BuildSessionFactory(); ... Later new SchemaExport(this.nhibernateConfiguration) .SetOutputFile(filePath) .Execute(false, false, false); fluentDatabaseProvider is a FluentNHibernate IPersistenceConfigurer which is needed to get proper sql dialect for database creation. When factory is created with an existing database, everything works fine. But what i want to do is to create an NHibernate Configuration object on a selected database engine without a real database behind the scene... And i don't manage to do this. If anybody has some idea.

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• Django Inline Admin elements do not allow editing

  - by nickcartwright

  Hiya, In the Django admin I'd like the ability to edit my models referenced by foreign keys In-Line. I've read all the instructions, added a TabularInline object and my models are displayed there. All looks great, however, I only have the option to add new models and not an option to edit existing. Is there something I've been missing? All the documentation suggests the In-Line models are there to allow you to edit referenced models In-Line, however - all I can see is Add. Any help would be much appreciated!

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• Creating seed model from data already in DB

  - by Nick Brown

  Is there a way to convert data in an existing database into objects that can easily be put into a seed method? Essentially I'd like to let some people add lines to my DB via a form and then convert that into an object that I can re-seed the DB anytime I need to make changes. The database itself is created via code-first using the following model: public class Combo { public int Id { get; set; } public string MainPrefix { get; set; } public string MainDescriptor { get; set; } public string MainDish { get; set; } public string Connector { get; set; } public string SecondaryDescriptor { get; set; } public string SecondaryDish { get; set; } }

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• What is the correct way to bootstrap Drupal with Kohana 3?

  - by Dave

  Hi, I am trying to implement single sign on between an existing Drupal site a Kohana 3 based webapp. Ideally I would like to load Drupal's session information into $GLOBALS using the bootstap: require_once('../includes/bootstrap.inc'); drupal_bootstrap(DRUPAL_BOOTSTRAP_SESSION); A post on the Kohana forum suggested that this should be placed in Kohana's index.php, but didn't say where. I've tried right at the start, and just before Kohana's own bootstrap, but both result in a White Screen of Death. Changing the bootstrap level to DRUPAL_BOOTSTRAP_CONFIGURATION works, but the session data isn't loaded. Any bootstrap level above DRUPAL_BOOTSTRAP_ACCESS results in a WSOD. If anyone has any ideas I'd really appreciate it!

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• Efficiently remove points with same slope

  - by Ram

  Hi, In one of mine applications I am dealing with graphics objects. I am using open source GPC library to clip/merge two shapes. To improve accuracy I am sampling (adding multiple points between two edges) existing shapes. But before displaying back the merged shape I need to remove all the points between two edges. But I am not able to find an efficient algorithm that will remove all points between two edges which has same slope with minimum CPU utilization. Currently all points are of type PointF Any pointer on this will be a great help.

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• Code Golf: Ghost Leg

  - by Anax

  The challenge The shortest code by character count that will output the numeric solution, given a number and a valid string pattern, using the Ghost Leg method. Examples Input: 3, "| | | | | | | | |-| |=| | | | | |-| | |-| |=| | | |-| |-| | |-|" Output: 2 Input: 2, "| | |=| | |-| |-| | | |-| | |" Output: 1 Clarifications Do not bother with input. Consider the values as given somewhere else. Both input values are valid: the column number corresponds to an existing column and the pattern only contains the symbols |, -, = (and [space], [LF]). Also, two adjacent columns cannot both contain dashes (in the same line). The dimensions of the pattern are unknown (min 1x1). Clarifications #2 There are two invalid patterns: |-|-| and |=|=| which create ambiguity. The given input string will never contain those. The input variables are the same for all; a numeric value and a string representing the pattern. Entrants must produce a function. Test case Given pattern: "|-| |=|-|=|LF| |-| | |-|LF|=| |-| | |LF| | |-|=|-|" |-| |=|-|=| | |-| | |-| |=| |-| | | | | |-|=|-| Given value : Expected result 1 : 6 2 : 1 3 : 3 4 : 6 5 : 5 6 : 2

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• PHP code in drupal pages treating > as ?>

  - by AmaDaden

  While working on an existing Drupal site I've noticed a strange glitch that causes any PHP operator with in it to act like a ? tag. This is happening in in Drupal pages that I create that have a 'Input Format' of 'PHP code'. For example this line of code foreach($array as $key = $value){ results in a very broken page that prints out $value){ Does any one know what could be causing this? My Dev environment is XAMPP. Drupal version is 6.15. PHP version is 5.2.9.

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• Ways to make your WCF services compatible with non-.NET consumers

  - by Mayo

  I'm working on adding a WCF services layer to my existing .NET application. This layer will be hosted in IIS and will be consumed by a variety of UIs, at least one of which will not use Microsoft technologies. I can make a Web service in WCF that is consumed by my .NET application. However, I'm concerned about things that work in the .NET world but not with other technologies. For example, simply throwing an exception from my WCF service works fine in .NET. But according to this article, one should approach exception handling with fault contracts to ensure compatibility with non-.NET consumers. The author labels this lack of foresight as The Fallacy of the .NET-Only World. Does anyone have any high level suggestions or links to articles that cover interoperability between WCF and non-.NET consumers? I realize I'm potentially working against the YAGNI principle. I'm only really looking to avoid things that will be incredibly difficult to overcome later when the developers of the non-.NET consumer report problems to me.

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• Premium Services - Ad blocker legal or illegal?

  - by René

  Ok, maybe thats kind of a stupid question. But let's try to get an answer. I'm building a Desktop Solution for an existing web service. That web service is only available without ads when you pay for a premium account. Would it be illegal when I block this ads in my Desktop Application? When you use this web service over the browser, every user has the chance to block ads with adblocker addons. So why not block this stuff in my Desktop Application?

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• Which filter of FileSystemWatcher do I need to use for finding new files

  - by BDotA

  So far I know that FileSystemWatcher can look into a folder and if any of the files inside that folder is changed,modifies,.etc... then we can handle it. But I am not sure which filter and event I should use in my scenario: Watch for a Folder, If a file is added to that folder, do XYZ ... So In my scenario I don't care if an existing file is changed,etc..those should be ignored...only do XYZ if and only if a new file has been added to that Folder... Which event and filter do you recommended for this scenario?

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• Getting Database Data to the client side.

  - by Toby Allen

  I'm sure this has been asked a million times, but what is the accepted approach to this? I have been writing php code for a while and up until recently I only copied+pasted javascript code, but now with help from YUI I've begun to understand javascript and want to use it more in an existing web app I have. I want to get various amounts of data from databases etc to the clientside javascript. I have access to this data in my php pages when loading. What is the correct way to get this data to my client side script. Generate clientside javascript in my php or smarty template files inserting the data where I need it? Use an Ajax call to retrieve the information I need from a php file - returning JSON data? Generate a JSON data construct of the data needed by the page and either return it via a script inclusion or dumping it to the generated page? Something really obvious I haven't thought of.

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• Why in Objective-C, we use self = [super init] instead of just [super init]?

  - by ????

  In a book, I saw that if a subclass is overriding a superclass's method, we may have self = [super init]; First, is this supposed to be done in the subclass's init method? Second, I wonder why the call is not just [super init]; ? I mean, at the time of calling init, the memory is allocated by alloc already (I think by [Foobar alloc] where Foobar is the subclass's name. So can't we just call [super init] to initialize the member variables? Why do we have to get the return value of init and assign to self? I mean, before calling [super init], self should be pointing to a valid memory allocation chuck... so why assigning something to self again? (if assigning, won't [super init] just return self's existing value?)

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• Android: Custom Clock widget Service work-around?

  - by Anthony Forloney

  I was interested in developing a clock widget for the homescreen and upon reading Home Screen Widgets tutorial, is there a pre-existing Service I could reference for updating the current time rather than re-inventing the wheel? I have currently Retro Clock on my android phone and noticed that when I click it, it pops up the Alarm Clock settings, but with the default Google Analog Clock widget, upon click does nothing. Is that because the Retro Clock widget implements the Alarm Clock service? If so, how can I go about referencing that service? Or do I have this all wrong and misunderstood? Any help is appreciated. EDIT: I believe implementing the service to update the clock would drain the battery life tremendously, any ideas on a work around or help shed some light on any performance issues with using Service?

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• Copy Rows in a One to Many with LINQ to SQL

  - by Refracted Paladin

  I have a table that stores a bunch of diagnosis for a single plan. When the users create a new plan I need to copy over all existing diagnosis's as well. I had thought to try the below but this is obviously not correct. I am guessing that I will need to loop through my oldDiagnosis part, but how? Thanks! My Attempt so far... public static void CopyPlanDiagnosis(int newPlanID, int oldPlanID) { using (var context = McpDataContext.Create()) { var oldDiagnosis = from planDiagnosi in context.tblPlanDiagnosis where planDiagnosi.PlanID == oldPlanID select planDiagnosi; var newDiagnosis = new tblPlanDiagnosi { PlanID = newPlanID, DiagnosisCueID = oldDiagnosis.DiagnosisCueID, DiagnosisOther = oldDiagnosis.DiagnosisOther, AdditionalInfo = oldDiagnosis.AdditionalInfo, rowguid = Guid.NewGuid() }; context.tblPlanDiagnosis.InsertOnSubmit(newDiagnosis); context.SubmitChanges(); } }

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• Async stream writing in a thread

  - by blez

  I have a thread in which I write to 2 streams. The problem is that the thread is blocked until the first one finishes writing (until all data is transferred on the other side of the pipe), and I don't want that. Is there a way to make it asynchronous? chunkOutput is a Dictionary filled with data from multiple threads, so the faster checking for existing keys is, the faster the pipe will write. void ConsumerMethod(object totalChunks) { while(true) { if (chunkOutput.ContainsKey(curChunk)) { if (outputStream != null && chunkOutput[curChunk].Length > 0) { outputStream.Write(chunkOutput[curChunk]); // <-- here it stops } ChunkDownloader.AppendData("outfile.dat", chunkOutput[curChunk], chunkOutput[curChunk].Length); curChunk++; if (curChunk >= (int) totalChunks) return; } Thread.Sleep(10); } }

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• Any way to add an observer to the head of the queue using Element#observe?

  - by Josh

  This might not be possible but before I rewrite part of my application I wanted to ask... I have a JavaScript app which creates a submit <input> and observes that input's click event using Prototype's Element#observe function. For a few particular pages on one particular site which uses this app, I need to apply some additional business logic before the code which executes normally when the button is clicked. Is there any way I can use Elemen#observe to add my new event handler before the existing event handler, so I can stop the event if these new conditions aren't met? If not I'll probably solve this the "proper" way by having the application fire a specific beforeTakingAction event and add a listener for that which prevents the application from taking it's action, but that's more complicated than this simple problem requires, and requires rewriting part of a shared application for just one user...

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• tmux: create session if none exists

  - by rampion

  I'm switching from using gnu-screen to tmux, and I'm still trying to wrap my head around changes. One thing I'd like to be able to do is start tmux and have it automatically connect to a session if one exists, and otherwise create a new session. tmux attach attaches to an automatically existing session - but errors out if no session exists tmux new creates a new session - but it does so every time, so I can't leave it in my .tmux.conf tmux has-session tests whether a session exists - but I don't know how to stitch it together with the other commands Can anyone give me some configure file advice?

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• NHibernate Many-to-many with a boolean flag on the association table

  - by Nigel

  Hi I am doing some work on an application that uses an existing schema that cannot be altered. Whilst writing my NHibernate mappings I encountered a strange many-to-many relationship. The relationship is defined in the standard way as in this question with the addition of a boolean flag on the association table that signifies if the relationship is legal. This seems somewhat redundant but as I say, cannot be changed. Is it possible to define this relationship in Nhibernate without resorting to using a third class to represent the association? Perhaps by applying a filter? Many thanks.

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• How to generate entities with Objects?

  - by 01

  I want to generate @Enities with seam-gen from existing database. However its generates very simple version only. For Example @Entity @Table(name = "badges") public class Badges implements java.io.Serializable { private Integer id; private **Integer userId**; private String name; private String date; I want him to generate @Entity @Table(name = "badges") public class Badges implements java.io.Serializable { private Integer id; private **User user**; private String name; private String date; I even have constrain on userId and it points to column User.id P.S. Im using MySQL5 and seam gen is using hbm2java to generate entities.

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• Blackberry: RadioButtonFiled and EditFiled in the same line doesn't show EditField?

  - by user187532

  Hi All, I have a RadioGroup and two RadioButtonField added in a VerticalFieldManager. I want put an EditField for the first RadioButtonField horizontally. For ex: I have two RadioButtonField as "Enter number here:" otherwise user can choose "Number from existing Database:" in the second RadioButtonsField. In the first field "Enter number here:" i need provide an EditField horizontally next to first RadioButtonField, for him to type. I am trying to put an EditField horizoally but it doesn't show EditField horizonatally to the first RadioButtonField. May i know how to do that (or) any samples to do that? Thanks.

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• How do I list all cron jobs for all users?

  - by yukondude

  Is there a command or an existing script that will let me view all of a *NIX system's scheduled cron jobs at once? I'd like it to include all of the user crontabs, as well as /etc/crontab, and whatever's in /etc/cron.d. It would also be nice to see the specific commands run by run-parts in /etc/crontab. Ideally, I'd like the output in a nice column form and ordered in some meaningful way. I could then merge these listings from multiple servers to view the overall "schedule of events." I was about to write such a script myself, but if someone's already gone to the trouble...

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• Creating quick GUI front ends

  - by Jeenu

  Hi, I wanted to have a GUI front-end for a script that accepts numerous command-line options, most of them are UNIX paths. So I thought rather than typing them in (even with auto-completion) every time, I'd create a GUI front end which contains text boxes with buttons beside them, which when clicked will invoke the file browser dialogue. Later, I thought I'd extend this to other scripts which would sure require a different set of GUI elements. This made me think if there's any existing app that would let me create a GUI dialog, after parsing some kind of description of the items that I want that window should contain. I know of programs like Zenity, but I think it's doesn't give me what I want. For example, if I were to use it for the first script, it'll end up flashing sequence of windows in succession rather than getting everything done from a single window. So, basically I'm looking at some program that lets me create a window from a text description, probably XML or the like. Please suggest. Thanks Jeenu

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