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• dpkg snippet isn't working for me when fixing / installing dockbar

  - by user3924

  I'm trying to use this code from webupd8 to fix the problem I have. It seems it didn't work. sudo dpkg -i --force-overwrite /var/cache/apt/archives/smplayer_0.6.9+svn3595-1ppa1~maverick1_i386.deb Here is the output from my attempt to install dockbar : $ sudo dpkg -i --force-all var/apt/cache/archives/dockmanager_0.1.0~bzr80-0ubuntu1~10.10~dockers1_i386.deb dpkg: error processing var/apt/cache/archives/dockmanager_0.1.0~bzr80-0ubuntu1~10.10~dockers1_i386.deb (--install): cannot access archive: No such file or directory Errors were encountered while processing: var/apt/cache/archives/dockmanager_0.1.0~bzr80-0ubuntu1~10.10~dockers1_i386.deb Is there any way around this?

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• In WPF, how do I update the object that my custom property is bound to?

  - by Timothy Khouri

  I have a custom property that works perfectly, except when it's bound to an object. The reason is that once the following code is executed: base.SetValue(ValueProperty, value); ... then my control is no longer bound. I know this because calling: base.GetBindingExpression(ValueProperty); ... returns the binding object perfectly - UNTIL I call base.SetValue. So my question is, how do I pass the new "value" on to the object that I'm bound to?

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• Do unused vertices in a 3D object affect performance?

  - by Gajet

  For my game I need to generate a mesh dynamically. Now I'm wondering does it have a noticeable affect in FPS if I allocate more vertices than what I'm actually using or not? and does it matter if I'm using DirectX or OpenGL? Edit Final output will be a w*h cell grid, but for technical issues it's much easier for me to allocate (w+1)*(h+1) vertices. Sure I'll only use w*h vertices in indexing, and I know there is some memory wasting there, but I want to know if it also affect FPS or not? (Note that mesh is only generated once in each time you play the game)

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• How to persist and load an object which conforms to NSCoding protocol?

  - by mystify

  I have made an class which conforms to the NSCoding protocol and does all the encode and decode stuff. For my app, I simply want to persist an object from that class to the device and the next time when the app launches, I want to load that object back into memory. Basically it's just an class which holds some user input information. For example the user starts writing a text but then quits the app. Next time I want to load that data object. I guess I need NSKeyedArchiver? Is there a good tutorial on this? How do I do that?

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• does unused vertices in a 3D object affect performance?

  - by Gajet

  For my game I need to generate a mesh dynamically. now I'm wondering does it have a noticeable affect in fps if I allocate more vertices than what I'm actually using or not? and does it matter if I'm using DirectX or OpenGL? edit final output will be a w*h cell grid, but for technical issues it's much more easier for me to allocate (w+1)*(h+1) vertices. sure I'll only use w*h vertices in indexing, and I know there is some memory wasting there, but I want to know if it also affect fps or not? (note that mesh is only generated once in each time you play the game)

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• Determining if something is on the right or left side of an object?

  - by meds

  I have a character in a 3D world which is facing an arbitrary direction on a flat plane, the player can click on the left or right side of the character and based on which side is clicked on a different action happens. How can I determine which side the click occured on? Obviously for straight on ahead (0,0,1) I can simply use the x coordinate of the click point to determine if it's the left or right hand side, but what about other cases?

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• List in a Python class shares the same object over 2 different instances?

  - by zfranciscus

  I created a class: class A: aList = [] now I have function that instantiate this class and add items into the aList. note: there are 2 items for item in items: a = A(); a.aList.append(item); I find that the first A and the second A object has the same number of items in their aList. I would expect that the first A object will have the first item in its list and the second A object will have the second item in its aList. Can anyone explain how this happens ? PS: I manage to solve this problem by moving the aList inside a constructor : def __init__(self): self.aList = []; but I am still curious about this behavior

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• How do I find out if an object can be Invoke()'d?

  - by Jurily

  Consider the following class: public class Event<T> { public delegate void Handler<t>(t msg); private event Handler<T> E; public void connect(Delegate handler) { E += delegate(T msg) { object target = handler.Target; if (Invokable(target) { target.BeginInvoke(handler, new object[] { msg }); } }; } public void emit(T msg) { if ( E != null ) { E(msg); } } private static bool Invokable(object o) { // magic } } How do I implement Invokable(), and what else do I need for this code to compile?

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• Using Bulk Operations with Coherence Off-Heap Storage

  - by jpurdy

  Some NamedCache methods (including clear(), entrySet(Filter), aggregate(Filter, …), invoke(Filter, …)) may generate large intermediate results. The size of these intermediate results may result in out-of-memory exceptions on cache servers, and in some cases on cache clients. This may be particularly problematic if out-of-memory exceptions occur on more than one server (since these operations may be cluster-wide) or if these exceptions cause additional memory use on the surviving servers as they take over partitions from the failed servers. This may be particularly problematic with clusters that use off-heap storage (such as NIO or Elastic Data storage options), since these storage options allow greater than normal cache sizes but do nothing to address the size of intermediate results or final result sets. One workaround is to use a PartitionedFilter, which allows the application to break up a larger operation into a number of smaller operations, each targeting either a set of partitions (useful for reducing the load on each cache server) or a set of members (useful for managing client result set sizes). It is also possible to return a key set, and then pull in the full entries using that key set. This also allows the application to take advantage of near caching, though this may be of limited value if the result is large enough to result in near cache thrashing.

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• How can I check the type of an object against a list of types?

  - by RookieRick

  Given a collection IEnumerable<Type> supportedTypes What's the best way to check whether a given object is one of those types (or a derived type)? My first instinct was to do something like: // object target is a parameter passed to the method in which I'm doing this. if (supportedTypes.Count( supportedType => target is supportedType ) > 0) { // Yay my object is of a supported type!!! } ..but that doesn't seem to be working. Can I not use the "is" keyword in a lambda expression like this?

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• Core Data strategy using in memory cache, or no core data at all?

  - by randombits

  I have a user interface where the user can check off a bunch of items from a tableview, almost like a todo list. The items are populated from a Core Data stack. I need to be able to take all of the items they're clicking through and put them into a "temporary" shopping cart. Once they're in the shopping cart, users can go through the list and remove the items, or just submit them to a server. The thing is, the selected items are temporary just like an internet based shopping cart. It's nothing something that gets persisted once the application closes. Once the view is no longer in display, I can assume that the shopping cart is safe to discard. What's the best way to approach this? Since the user is essentially clicking on instances that map back to a Core Data entity .. should I setup a different persistence store such as in memory and add that store to my managed object context?

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• How do you use a flash object as a link?

  - by Matthew Crumley

  Is it possible to use a flash document embedded in HTML as a link? I tried just wrapping the object element with an a like this: <a href="http://whatever.com"> <object ...> <embed ... /> </object> </a> In Internet Explorer, that made it show the location in the status bar like a link, but it doesn't do anything. I just have the .swf file, so I can't add a click handler in ActionScript.

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• How do i change Object to String in a class which extends AsyncTask?

  - by Filip V.

  I'm learning from Google's Android developing tutorial and i came across a problem. On this link https://developer.android.com/training/basics/network-ops/connecting.html#AsyncTask it says to create a class that extends AsyncTask. So when i write the class it automatically implements the method as follows: private Object doInBackground(Object... args) {..} //it's fine but when i try writing just as it says in the tutorial: private String doInBackground(String... args) {..} //it gives an error and the error says: The method doInBackground(String...) of type MainActivity.DownloadWebpageText must override a superclass method. So how do i change Object to String without getting an error there?

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• What's the current (as of April 2010) state of affairs regarding <object> vs <embed> in HTML?

  - by rvdm

  The age old question. <object> vs <embed>. From what I gather, <object> is the XHTML-compliant way of doing things, while <embed> is for legacy support. I'm currently building a Flash application that will contain a pre-made embedding code for users to copy and paste, and I'm wondering if it's feasible to simply dump the <embed> tag altogether. Which browsers would be unable to load my application if I gave my users an <object>-only embed code? Thanks :)

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• Overload and hide methods in Java

  - by Marco

  Hi, i have an abstract class BaseClass with a public insert() method: public abstract class BaseClass { public void insert(Object object) { // Do something } } which is extended by many other classes. For some of those classes, however, the insert() method must have additional parameters, so that they instead of overriding it I overload the method of the base class with the parameters required, for example: public class SampleClass extends BaseClass { public void insert(Object object, Long param){ // Do Something } } Now, if i instantiate the SampleClass class, i have two insert() methods: SampleClass sampleClass = new SampleClass(); sampleClass.insert(Object object); sampleClass.insert(Object object, Long param); what i'd like to do is to hide the insert() method defined in the base class, so that just the overload would be visible: SampleClass sampleClass = new SampleClass(); sampleClass.insert(Object object, Long param); Could this be done in OOP?

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• Does remove a DOM object (in Javascript) will cause Memory leak if it has event attached?

  - by seatoskyhk

  So, if in the javascript, I create a DOM object in the HTML page, and attach event listener to the DOM object, upon I remove the the DOM from HTML page, does the event listener still exist and causing memory leak? function myTest() { var obj = document.createElement('div'); obj.addEventListener('click', function() {alert('whatever'); }); var body = document.getElementById('body'); // assume there is a <div id='body'></div> already body.appendChild(obj); } // then after some user actions. I call this: function emptyPage() { var body = document.getElementById('body'); body.innerHTML = ''; //empty it. } So, the DOM object, <div> inside body is gone. But what about the eventlistener? I'm just afraid that it will cause memory leak.

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• How do I delete an object from an Entity Framework model without first loading it?

  - by Tomas Lycken

  I am quite sure I've seen the answer to this question somewhere, but as I couldn't find it with a couple of searches on SO or google, I ask it again anyway... In Entity Framework, the only way to delete a data object seems to be MyEntityModel ent = new MyEntityModel(); ent.DeleteObject(theObjectToDelete); ent.SaveChanges(); However, this approach requires the object to be loaded to, in this case, the Controller first, just to delete it. Is there a way to delete a business object referencing only for instance its ID? If there is a smarter way using Linq or Lambda expressions, that is fine too. The main objective, though, is to avoid loading data just to delete it.

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• How to post JSON object to a URL without cURL in PHP? [closed]

  - by empyreanphoenix

  I have written a send sms code which uses an available sms api. So, I need to post a string in the json(string in $json) format to a url(url specified in $url var), but I am getting the following error String index out of range: -1 I understand that the error arises when requesting for an index that isn't there, but I dont find how that applies in this case. Please help. Note: name1,name2 and name3 are sender name, phone number and content respectively. Thanks array ( 'method' = 'POST', 'content' = $data, 'header' ="Authentication:$key" . "timeout:50000"."ContentLength: " . strlen ( $data) . "\r\n" ) ); if ($optional_headers != null) { $params ['http'] ['header'] = $optional_headers; } $ctx = stream_context_create ( $params ); try { $fp = fopen ( $url, 'rb', false, $ctx ); $response = stream_get_contents ( $fp ); echo "response"; } catch ( Exception $e ) { echo 'Exception: ' . $e-getMessage (); echo "caught"; } echo "done"; return $response; }

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• What Java data structure/design pattern best models this object, considering it would perform these methods?

  - by zundarz

  Methods: 1. getDistance(CityA,CityB) // Returns distance between two cities 2. getCitiesInRadius(CityA,integer) // Returns cities within a given distance of another city 3. getCitiesBeyondRadius(CityA,integer) //Returns cities beyond a given distance of another city 4. getRemoteDestinations(integer) // Returns all city pairs greater than x distance of each other 5. getLocalDestinations(integer) //Returns all city pairs within x distance of each other

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• XNA - How do I change the texture of a 2D object?

  - by Adorjan

  I am on to make a table game, I successfully figured out how to make the arraw and to move the cursor on it (by tiles). Now I wanna find out how to make that if I hit the Enter key the tile's texture change to another. I tryed like this: if (input.KeyPressed(Keys.Enter)) { cell[X,Y].Cell_texture = tile_texture; } but it doesn't really work. Hope you can help. :) Thanks!

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• Moving two objects proportionally

  - by SSL

  I'm trying to move two objects away from each other at a proportional distance, but on different scales. I'm not quite sure how to do this. Object A can go from position 0.1 to 1. Object B has no limits. If object B is decreasing, then Object A should be decreasing at rate R. Likewise, if Object B is increasing, then Object A increases at rate R. How can I tie these two Object positions together so that in an update loop, they automatically update their positions? I tried using: ObjA.Pos += 0.001f * ObjB.VelocityY; //0.001f is the rate This works but there's an error each time it runs. ObjA starts off at its max position 1 but then the next time it will stop at 0.97, 0.94, 0.91 etc.. This is due to the 0.001f rate I put in. Is there a way to control the rate, yet not end up with the rounding error?

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• How to insert an item into a key/value pair object?

  - by Clay

  Ok...here's a softball question... I just need to be able to insert a key/value pair into an object at a specific position. I'm currently working with a Hashtable which, of course, doesn't allow for this functionality. What would be the best approach? UPDATE: Also, I do need the ability to lookup by the key. For example...oversimplified and pseudocoded but should convey the point // existing Hashtable myHashtable.Add("somekey1", "somevalue1"); myHashtable.Add("somekey2", "somevalue2"); myHashtable.Add("somekey3", "somevalue3"); // Some other object that will allow me to insert a new key/value pair. // Assume that this object has been populated with the above key/value pairs. oSomeObject.Insert("newfirstkey","newfirstvalue"); Thanks in advance.

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• subscribing an event to a class object before initializing it.

  - by GN

  I have two classes class A and B.I have a delegate n event published in class B.The class B object is declared in class A.All he functionality dependes on the parameterised constru ctor of class B. Before initializing the object of class B i need to subscibe the event for it.how to do it? e.g public class B { public delegate void myDel(string); public event myDel myEvent; B(object obj) { ----------------- ------------------ } } class A { A objA; class XYZ objXYZ; void func() { objA.myEvent+=new myDel(); objA=new A(objXYZ); // hw to attain this? } }

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• Should my game handle collisions in the Player object?

  - by user1264811

  I'm making a 2D platform game. Right now I'm just working on making a very generic Player class. I'm wondering if it would be more efficient/better practice to have an ActionListener within the Player class to detect collisions with Enemy objects (also have an ActionListener) or to handle all the collisions in the main world. Furthermore, I'm thinking ahead about how I will handle collisions with the platforms themselves. I've looked into the double boolean arrays to see which tiles players can go to and which they can't. I don't understand how to use this class and the player class at the same time.

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• Django GenericRelation doesn't save related object's id - is this a bug or am I doing it wrong?

  - by pinkeen

  I have a model with a generic relation (call it A), when creating an instance of this object I pass an instance of another model (call it B) as the initializer of the content_object field (via kwargs of the constructor). If I don't save B before creating A then when saving A the content_object_id is saved to the db as NULL. If I save B before passing it to the constructor of A then everything's allright. It's not logical. I assumed that the ID of the related object (B) is fetched when doing A.save() and it should throw some kind of an exception if B isn't saved yet but it just fails silently. I don't like the current solution (saving B beforhand) because we don't know yet if I will be always willing to keep the object, not just scrap it, and there are performance considerations - what if I will add some another data and save it once more shortly after. class BaseNodeData(models.Model): ... extnodedata_content_type = models.ForeignKey(ContentType, null=True) extnodedata_object_id = models.PositiveIntegerField(null=True) extnodedata = generic.GenericForeignKey(ct_field='extnodedata_content_type', fk_field='extnodedata_object_id') class MarkupNodeData(models.Model): raw_content = models.TextField() Suppose we do: markup = MarkupNodeData(raw_content='...') base = BaseNodeData(..., extnodedata=markup) markup.save() base.save() # both records are inserted to the DB but base is stored with extnodedata_object_id=NULL markup = MarkupNodeData(raw_content='...') base = BaseNodeData(..., extnodedata=markup) base.save() markup.save() # no exception is thrown and everything is the same as above markup = MarkupNodeData(raw_content='...') markup.save() base = BaseNodeData(..., extnodedata=markup) base.save() # this works as expected Of course I can do it this way, but it doesn't change anything: base = BaseNodeData(...) base.extnodedata = markup My question is - is this a bug in django which I should report or maybe I'm doing something wrong. Docs on GenericRelations aren't exactly verbose.

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