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• Why not allow mutation of the this binding?

  - by gnucom

  Hi Everyone, I'm building a interpreter/compiler for a school project (well now its turning into a hobby project) and an instructor warned me not to allow mutation of the 'this' binding (he said it was gross and made a huge deal about it) but I never learned why this is so... dangerous or bad. I'm very curious about why this is so bad. I figured this sort of feature could be useful in some way or another. I'm wondering if anyone familiar with building languages can tell me what sort of problems mutation on the 'this' binding can cause, and if they know of any cool or useful tricks that one could do if it actually was allowed. Do any languages that you're aware of allow mutation of 'this'? Thanks,

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• Override default behavior of SPACE key in .net WinForms ListView

  - by Axarydax

  Hello, I'd like to implement some custom behavior of Space key in a ListView. Basically I'd like to toggle selected status of the item under cursor - that should be fairly simple this.FocusedItem.Selected = !this.FocusedItem.Selected; but alas, it also does the default action, which is to select the focused item. This way I am unable to 'unselect' the focused item. I've looked for similar problems and they suggest using PreviewKeyDown event, in which I would process the key and disallow the ListView to do its default action. But the PreviewKeyDown event argument has no "handled" property, so I cannot 'eat' this key.

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• VB.NET localization

  - by PandaNL

  In my winform app in VB.NET I want to use the localization option. But i have a few questions/problems. I'm using a menu strip to select an other language. But it seems that is doesn't change my menustip text to my selected language. It does change my labels, buttons, and textboxes but menu strips don't seem to change when I choose another language. Also is it possible to get those resx files such as MyForm.fr-FR.resx compiled so it isn't an external file outside my app? Or to get those files in an Language folder at the same location of my app, so i don't have all those fr-FR, nl-Nl folders in the same location as my program?

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• PHP SimpleXML - Remove xpath node

  - by Peter John

  Hi, I'm a little confused as to how i can delete a parent node of something which i can find via an xpath search: $xml = simplexml_load_file($filename); $data = $xml->xpath('//items/info[item_id="' . $item_id . '"]'); $parent = $data[0]->xpath("parent::*"); unset($parent); So, it finds the item id, no problems there - but the unset isnt getting rid of this <items> node. All i want to do is remove the <items>...</items> for this product. Obviously, there are loads of <items> nodes in the xml file so it cant do unset($xml->data->items) as that would delete everything. Any ideas much appreciated :-)

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• Datanucleus/JDO Level 2 Cache on Google App Engine

  - by Thilo

  Is it possible (and does it make sense) to use the JDO Level 2 Cache for the Google App Engine Datastore? First of all, why is there no documentation about this on Google's pages? Are there some problems with it? Do we need to set up limits to protect our memcache quota? According to DataNucleus on Stackoverflow, you can set the following persistence properties: datanucleus.cache.level2.type=javax.cache datanucleus.cache.level2.cacheName={cache name} Is that all? Can we choose any cache name? Other sources on the Internet report using different settings. Also, it seems we need to download the DataNucleus Cache support plugin. Which version would be appropriate? And do we just place it in WEB-INF/lib or does it need more setup to activate it?

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• How do I upgrade my Crystal Report libraries in a .NET 3.5 project to CR XI R2?

  - by Stuart B

  Our project currently uses Crystal Reports for Visual Studio 2008. We need to upgrade to XI R2, but I'm having problems doing so. Here are the steps I followed: Install Crystal Reports XI R2. Collect updated assemblies from the GAC. I did this because I couldn't find version XI libraries in the "Add References..." dialog. I verified that these assemblies were of version 11.5.*. The libraries I gathered were: CrystalDecisions.CrystalReports.Engine CrystalDecisions.Enterprise.Framework CrystalDecisions.Enterprise.InfoStore CrystalDecisions.ReportSource CrystalDecisions.Shared CrystalDecisions.Windows.Forms Replace all references in my projects to version 10.5 Crystal libraries with references to the newer assemblies. Everything builds fine, but when I try to instantiate a ReportDocument, I get this error: The type initializer for 'CrystalDecisions.CrystalReports.Engine.ReportDocument' threw an exception. Is there anything I'm missing? Will this just not work?

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• Lucene numDocs and doqFreq on custom similarity class

  - by David A

  Hi All, im doing an aplication with Lucene (im a noob with it) and im facing some problems. My aplication uses the Lucene 2.4.0 library with a custom similaraty implementation (the jar is imported) In my app im calculating doqFreq and numDocs manually (im adding the values of all indexes and then i calculate a global value in order to use it on every query) and i want to use that values on a custom similarity implementation in order to calculate a new IDF. The problem is that I dont know how to use (or send) the new doqFreq and numDocs values from my app on that new similarty implementation as I dont want to change lucene´s code apart from this extra class. Any suggestions or examples? I read the docs but i dont now how to aproach this :s Thanks

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• How can I install Ruby on Rails 3 on OSX?

  - by Oluf Nielsen

  Hey i got an White Macbook and, has to go in 10 hours to a conference. And I'm having a lot of problems. First, I wanted to have Rails 3, so I used MacPorts to install Ruby 1.8.7. Tt worked well ;) So now I was thinking I should install Rails 3.. but no, no!.. it says.. $ sudo gem install rails --pre ERROR:   Error installing rails:                  activesupport requires Ruby version = 1.8.7. So what can I do? I have 1.8.7 !

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• Question about Java File Reader.

  - by Cris Carter

  Hello. I'm having some problems with the FileReader class. How do I specify an offset in the lines it goes through, and how do I tell it when to stop? Let's say I want it to go through each line in a .txt file, but only lines 100-200 and then stop? How would I do this? Right now I'm using ReadLine() but I don't think there's a way to specify offset with that. Any fast help is VERY appreciated. Thanks.

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• Composite events in locally scoped regions with Prism (CAL)

  - by Shaddix

  I'm starting to train Prism (CAL) with a small application and faced some problems. I'm creating multiple instances of my MainView, which itself contains some regions, and display them in the Shell. I'm using locally scoped regions to easily handle view injections within my MainView. Currently I'm searching for a way of communication between the views (viewModels) inside the MainView. Composite events could do it, but when I publish those events, they are handled in all instances of my MainView, which I really don't want. Is there a way of raising "locally scoped" composite events like with locally scoped regions? Or may be there's a better way of communicating between views in my case?

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• Dictionary is returning false on ContainsKey after item is added

  - by Karel Frajtak

  I have a dictionary declared as follows IDictionary<string, object> _objectIds = new Dictionary<string, object>(); I was experiencing some problems with it and it discovered that the instance returned false as a result of ContainsKey method and from the watch window I was sure that the item was there. So I created helper method private bool IdsContainsKey(string key) { lock (syncObject) { lock (_objectIds) { if (_objectIds.ContainsKey(key)) return true; // A if (_objectIds.ContainsKey(key)) return true; // B return _objectIds.ContainsKey(key); // C } } } During my debugging session I run into situation when the method exited in place B and sometimes I made to C returning true. Can anybody help me? Thanks.

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• A way to measure performance

  - by Andrei Ciobanu

  Given Exercise 14 from 99 Haskell Problems: (*) Duplicate the elements of a list. Eg.: *Main> dupli''' [1..10] [1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10] I've implemented 4 solutions: {-- my first attempt --} dupli :: [a] -> [a] dupli [] = [] dupli (x:xs) = replicate 2 x ++ dupli xs {-- using concatMap and replicate --} dupli' :: [a] -> [a] dupli' xs = concatMap (replicate 2) xs {-- usign foldl --} dupli'' :: [a] -> [a] dupli'' xs = foldl (\acc x -> acc ++ [x,x]) [] xs {-- using foldl 2 --} dupli''' :: [a] -> [a] dupli''' xs = reverse $ foldl (\acc x -> x:x:acc) [] xs Still, I don't know how to really measure performance . So what's the recommended function (from the above list) in terms of performance . Any suggestions ?

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• Having two ODP.NET (ODAC) versions in the same server

  - by vizcaynot

  Hello: Some months ago, a colleague of mine installed ODAC 11.106.21 in a server using XCOPY and then he developed many applications that use this client without problems (in test and production windows servers). Past week, I developed an application under ODAC 11.1.07.20. When I asked him to install these new ODAC version using XCOPY in a different folder and then include my application in the test server, he answered me that I should use ODAC 11.106.21 because he could have troubles with his applications. So I would like to know: 1) If it is really possible to have two different ODAC versions in one server. 2) If the answer is positive, how can I firmly ensure to my colleague that he will not have troubles with his applications? 3) If the answer is positive, is this necessary to do some kind of configuration in the server? Thanks!!

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• Dragging a Sprite (Cocos2D) while Chipmunk is simulating

  - by itai alter

  Hello all! I have a simple project built with Cocos2D and Chipmunk. So far it's just a Ball (body, shape & sprite) bouncing on the Ground (a static line segment at the bottom of the screen). I implemented the ccTouchesBegan/Moved/Ended methods to drag the ball around. I've tried both: cpBodySlew(ballBody, touchPoint, 1.0/60.0f); and ballBody->p = cgPointMake(touchPoint.x,touchPoint.y); and while the Ball does follow my dragging, it's still being affected by gravity and it tries to go down (which causes velocity problems and others). Does anyone know of the preferred way to Drag an active Body while the physics simulation is going on? Do I need somehow to stop the simulation and turn it back on afterwards? Thanks!

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• How do I run different threads in Java?

  - by Cris Carter

  Hey. I'm having some problems with threads. I understand how they work, but since they all use the same method, how do I run different threads that do completely different things, but at the same time? To me, it seems that they always use the same standard method which makes them do the same thing. So, let's say I have a big .txt file where I want to go through each line and do something to the line. In this case, I would like to have each thread do 1/10th of the .txt file, but I don't understand how the threads can communicate with each other, and how they could organize so each thread does the right part? Could anyone explain or help me with this? Would be very much appreciated!

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• Replace these OpenGL functions with OpenGL ES?

  - by Constantin

  I search for a possibility to migrate my PC OpenGL application and an iPhone App into one XCode project (for convenience). So if I make chances to these source files I want to apply this for both plattforms and want to be able to compile for both plattforms from one project. How could I accomplish this? Is there a way to do so in XCode 4 or 3.25? Any help would be highly appreciated edit: Okay, I went so far - All in all, it seems to work with XCode 4. My only problems are these openGL/Glut functions, that aren't working on iPhone: glPushAttrib( GL_DEPTH_BUFFER_BIT | GL_LIGHTING_BIT ); glPopAttrib(); glutGet(GLUT_ELAPSED_TIME); glutSwapBuffers(); Any ideas how to fix these issues?

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• How can i do this using a Python Regex?

  - by uberjumper

  I am trying to properly extract methods definitions that are generated by comtypes for Com Interfaces using a regex. Furthermore some of them are blank which causes even more problems for me. Basically i have this: IXMLSerializerAlt._methods_ = [ COMMETHOD([helpstring(u'Loads an object from an XML string.')], HRESULT, 'LoadFromString', ( ['in'], BSTR, 'XML' ), ( ['in'], BSTR, 'TypeName' ), ( ['in'], BSTR, 'TypeNamespaceURI' ), ( ['retval', 'out'], POINTER(POINTER(IUnknown)), 'obj' )), ] class EnvironmentManager(CoClass): u'Singleton object that manages different environments (collections of configuration information).' _reg_clsid_ = GUID('{8A626D49-5F5E-47D9-9463-0B802E9C4167}') _idlflags_ = [] _typelib_path_ = typelib_path _reg_typelib_ = ('{5E1F7BC3-67C5-4AEE-8EC6-C4B73AAC42ED}', 1, 0) INumberFormat._methods_ = [ ] I want to extract both the IXMLSerializerAlt and INumberFormat methods definitions however i cant figure out a proper regex. E.g. for IXMLSerializer i want to extract this: IXMLSerializerAlt._methods_ = [ COMMETHOD([helpstring(u'Loads an object from an XML string.')], HRESULT, 'LoadFromString', ( ['in'], BSTR, 'XML' ), ( ['in'], BSTR, 'TypeName' ), ( ['in'], BSTR, 'TypeNamespaceURI' ), ( ['retval', 'out'], POINTER(POINTER(IUnknown)), 'obj' )), ] This regex in my mind this should work: ^\w+\._methods_\s=\s\[$ (^.+$)* ^]$ Im checking my regex's using kodos however i cannot figure out a way to make this work.

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• JiBX binding DTD schema in Eclipse

  - by Trick

  I have warnings in binding xml files: No grammar constraints (DTD or XML schema) detected for the document. I have done as is written in the answer here: http://stackoverflow.com/questions/982263/jibx-how-do-i-keep-using-interfaces-in-my-code (answer which is not accepted). But now I have an error in binding xml file: Referenced file contains errors (file:/C:/Amplio/LiveCliq/Work/core/src/main/resources/config/rest/ mappings/binding.dtd). For more information, right click on the message in the Problems View and select "Show Details..." And the details are: The markup in the document preceding the root element must be well-formed. line 20 I am not familiar with DTD schemas, so I don't know what is the problem. Did anybody found the solution? And - I do not want to turn off validation in XML files, I would like to have this in binding files (mainly for code assist and validation).

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• Recursive TreeView in ASP.NET

  - by waqasahmed

  I have an object of type list from which I wish to use to populate a treeview in asp.net c#. Each object item has: id | Name | ParentId so for example: id | Name | ParentId ------------------------- 1 | Alice | 0 2 | Bob | 1 3 | Charlie | 1 4 | David | 2 In the above example, the parent would be Alice having two children Bob and Charlie. David is the child of Bob. I have had many problems trying to dynamically populate the treeview recursively in c# ASP.NET Does any one have a simple solution? Btw: you can use People.Id, People.Name and People.ParentId to access the members since it is an object belonging to list. I can post you my code so far (many attempts made) but not sure how useful it will be.

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• RDLC: Is there a way to print multiple tables without SubReports?

  - by Eduardo Molteni

  I'm generating the RDLC XML schema and showing the report in the ReportViewer control. No problems there. Now, I want a report with 2 tables, with 2 differents dataset. Something like this gets generated: <Body> <ReportItems> <Table Name="Table1"> .... </Table> <Table Name="Table2"> .... </Table> </ReportItems> </Body> But, when printed, both tables start from the top, printing on table over the other (not nice) Is there a way to tell that Table2 should start after Table1? Update: I've tried with List with a fake DataSource, but it does not work.

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• Performance benefits of upgrading Richfaces to newer version

  - by peteDog

  I have a client that's running an application based on JBoss 4.0.5, Seam 1.2 and RichFaces 3.0.1. Their system is having performance problems due to the fact that a lot of data is coming back from the server to be displayed on screen and it seems like the rendering of that data is taking forever. The data brought back is displayed in a tabbed interface, but the tabs aren't currently being loaded individually, but all at once. I'm trying to build up a case to present to the client on the benefits of upgrading to never version of RichFaces, which, as I understand it, has added a great number of features related to tabbed panels and being able to use ajax to page the data and load the chunks you actually need to display at the moment, and not the rest that's in other tabs. The move to a newer version of RichFaces will also result in never versions of Jboss and Seam, as the current production build of RichFaces 3.2.1 requires JSF 1.2. IF anyone has some suggestions or experience on performance of current versions RichFaces, paging, etc, I would really appreciate some feedback.

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• ERD Design help meeded

  - by Mobi

  Hello guyz, I am new to ERD and stuff.Earlier i was drawing an erd that issued me some problems. the name of two entities in focus is "Bus" and "Passenger".What shall be the relationship between them. I think it should be many to many since one passenger can travel in many buses and a bus can give ride to many passengers.But one of my friend insisted that its a one-to-many relationship(A bus can have many passengers but a passenger can travel in only one bus).Plz let me know what's right. Also , whats the relationship between a class,students. Any help is appreciated.

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• Version Control for developers new to source control

  - by Daisetsu

  I've been writing code for a few years now and our backup strategy has been to zip the entire code directory up every few days and put it somewhere else on your hard drive, or occasionally upload it to some online file hosting service. Unfortunately the file hosting service got canceled without telling me and we lost years of backups. It's come down to the point where I finally have to learn to use version control. The only problems are My boss really doesn't like SVN, he tried it and it had a high learning curve (at least his client). We need a reliable place to host it (we can pay a reasonable amount). Can someone suggest what may be the best version control system and client for a newbie which won't be too annoying. Second what is a good remote version control service?

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• daynamic 2d array in c++ and memory leaks

  - by SepiDev

  Hi guys, i wrote this code, it runs ok, but when i check it under Valgrind it catches 2 problems, since i can not interpret valgrind's messages i will appreciate if anyone explain me more and tell me where is the problem!!! here is the code: #include <iostream> #define width 70000 #define height 10000 using namespace std; int main(void) { int** pint; pint = new int*[height]; for(int i = 0; i < height; i++) pint[i] = new int[width]; for(int i = 0; i < height; i++){ delete[] pint[i]; pint[i] = NULL; } delete[] pint; pint = NULL; return 1; }

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• Is there a Maven plugin to generate AS3 classes from Java for BlazeDS ?

  - by Maskime

  Hi, I'm looking for a maven plugin that would generate ActionScript3 classes from Java classes in order to access them by object remoting. I've seen FlexMojo but it uses the GraniteDS generator wich create some problems when it comes to map Enum objects (wich can be fix through a workaround that is describe here : http://dev.c-ware.de/confluence/display/PUBLIC/Flexmojos+generated+AS3+model+with+Enum+support+using+BlazeDS?focusedCommentId=7634946&#comment-7634946 if you've googled your way here this might be useful) when working with BlazeDS. Everything that i found so far are people who explain how to generate VO classes on flex side using Flash Builder 4, but this solution can not be used in an industrial developpement environnement. Thanks in advance for any leads on this matter.

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