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• Typecasting doesn't work. How to convert an object?

  - by Nastase Ion

  Hi everyone! I need to convert a custom object to a different object. How can I do that? I know that typecasting doesn't work (the only thing is does is "shuts the compiler warnings off", but nothing more). Here is a sample code: MyType* obj1; MyOtherType* obj2; obj1 = [MyType initWithData: 1]; obj2 = (MyOtherType*) obj1; if ([obj2 isMemberOfClass: [MyOtherType class]]) { NSLog(@"OK"); } else if ([obj2 isMemberOfClass: [MyType class]]) { NSLog(@"Nope"); } The result is: Nope What can I do??

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• 4D - is it any good?

  - by Pies

  Recently I found out that the company a friend of mine co-owns uses 4D, which I've never heard of before. They swear by it, but they're non-technical and what they say about it sounds like memorized marketing blurb. Unfortunately the 4D website also seems devoid of any actual information and is filled with words like "comprehensive", "solution", "platform" and "integrated" instead. Since that thing is rather expensive and uses a custom language that I don't have much inclination to learn just for one project, I'm cautious about it and I'm wondering if anyone had any experience with it? Would you recommend it? What is it good for? What competitive advantage would I gain by learning it as a programmer, or using it as a company?

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• Creating a Linux Desktop Envoriment

  - by Alon

  Suppose I want to create my own desktop envoriment for Linux, without X. Like Google with the Android did. Where do I start? Is it actually a normal application that just draws stuff, and starts after the kernel boot? And how does it draw it? Using OpenGL or is there something more generic? And graphics drivers, how is it going? You should develop custom graphics drivers for your desktop or it comes with the Linux kernel? Note: It's for normal PCs and not embedded devices. Thanks.

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• jquery animate() problem

  - by meo

  $('#somediv').stop(false, true).animate({marginLeft: '-=' + e.width() + 'px'}, options.speed, function(){ options.onNewSlide() }) e.with() returns 640 opctions.speed contains 800 options.onNewSlide() contains a a custom callback function It works fine in firefox. But i debugged it with jquery.lint because it was throwing some random error in IE. lint tells me: When I called animate(...) with your args, an error was thrown! TypeError: c.speed is not a function { message="c.speed is not a function", more...} You passed: [Object { marginLeft="-=640px"}, 800, function()] and it indicates me the line i have posted. I have checked the jquery doc, but my syntax seams ok. Do you know what i am doing wrong?

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• How can I define a one-time event so that new handlers fire (once) even after the event has already occurred?

  - by harpo

  You know how this $(function() { ... }); will fire whether or not the "document ready" event has already occurred? I want to define an event like that. That event is a special case in jQuery. I'm wondering if a custom event can behave in the same way, using only the standard event mechanisms. Ideally, I'd like to be able to define handlers in the "normal" way: $(document).on("init.mything", function() { ... }); This works now if the above runs before init.mything is triggered. But if it doesn't, then the handler never runs. What makes this tricky is, I don't want to assume anything except that jQuery has loaded. Any ideas?

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• c# event and delegate question

  - by user359562

  I want to detach the custom event but could not detach. Please find below I am using -= to detach the event. I assume after this, TextChanged2 method should not be invoked as I have unregistered the event. Let me know if my understanding is wrong. public delegate void TextChangedEventHandler1(object sender, TextBoxargs ta); public event TextChangedEventHandler1 TextChanged1; private void textBox1_TextChanged(object sender, EventArgs e) { this.TextChanged1 -= new TextChangedEventHandler1(TextChanged2); TextChanged2(sender, e); } public void TextChanged2(object sender, EventArgs e) { textBox1.Text = textBox1.Text.ToUpper(); }

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• Time for creation of database on site

  - by slo2ols

  Hi. When and where would you create database to develop web site using ASP.NET MVC 2 and Entity Framework 4 (CreateDatabase method). I think about first run of web site and redirect on welcome page, when controller creates database from model. But I doubt about details: 1. Where? In HttpModule, but request of any image or css will check that database exist. In custom RouteHandler, but then anybody need to know that need to use this handler when to add route. In BaseController, but then code will look like SomeController(..., IDatabase database) : base(database). 2. When? Better create database on first run by any url or may be on deployment of site (additional tool which create ObjectContext and invoke CreateDatabase)? Thanks.

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• Make content 100% height with scrollbar

  - by Ben Sinclair

  I am using CKEditor (http://ckeditor.com) and I've created my own custom file browser... Problem is, when you open the filebrowser, it opens it in a new popup window and has no scrollbars. I submitted a support ticket 2 weeks ago to find out how to add the scrollbars and no answer. I can't find what to edit in the code either... So what I plan to do is make it scroll using CSS... I found this post about making the body 100% (http://stackoverflow.com/questions/886809/css-quirks-html-4-01-strict-100-body-height-and-scrollbars) but it doesn't add scrollbars. Any ideas how I can force scrollbars using CSS?

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• iPhone SDK: How to add multiple labels to table cell?

  - by iPhone Developer

  I am trying to create a custom table cell that conveys these data fields. a.) Name b.) Address1 c.) Address2 d.) Phone In the table cell these fields should appear centered one after another. Another requirement is that each of those fields be a different font and color. For that reason, I was thinking of creating labels and attaching them to the cell but I haven't had much luck getting this working. My question is, can this be done? If so, what is the general approach to follow? Any pointers or links to examples greatly appreciated.

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• Add the categories selector widget to the PAGE editor with predefined categories listed?

  - by Scott B

  The following code will add the categories selector widget to the WordPress Page editor interface... add_action('admin_menu', 'my_post_categories_meta_box'); function my_post_categories_meta_box() { add_meta_box('categorydiv', __('Categories'), 'post_categories_meta_box', 'page', 'side', 'core'); } What I would like to do is to figure out how to modify the resulting category listing so that it only contains a predefined list of hard coded categories that I define. Since I'm adding this via my custom theme, it will only appear on the page editor when my theme is active on the site. And I have some specific "handler" categories that my theme installs into the site and later uses to determine layout elements.

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• Updateable Priority Queue

  - by user1427661

  Is there anything built into the C++ Standard Library that allows me to work in a priority queue/heap like data structure (i.e., can always pop the highest value from the list, can define how the highest value is determined for custom classes, etc.) but allows me to update the keys in the heap? I'm dealing with fairly simple data, pairs to be exact, but I need to be able to update the value of a given key within the heap easily for my algorithm to function. WHat is the best way to achieve this in C++?

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• How to fast rendering UITableView

  - by pubudu

  In my program has two view controller. first one has one button.and second one has tableview with custom cell. in this cell has 5 textviews. when i click button of first tableview.it shows second view controller. Its is very slow rendering table view with 5 , 6 rows.it is working well with simulator.but it is very slow with actual i pad. when i click the button i have to wait 2,3 second with button pressed status.and after it view the second view controller it also very slow rendering.i can see it render rows. [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; this one also i used.when i comment this table from my second view.it navigate first view controller to second view controller very fast. how can i solve this issue?

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• .NET security mechanism to restrict access between two Types in the same Website project?

  - by jdk

  Question: Is there a mechanism in the .NET Framework to hide one custom Type from another without using separate projects/assemblies? I'm using C# with ASP.NET in a Website project (Note: Not a Web Application). Obviously there's not a way to enforce this restriction using language-specific OO keywords so I am looking for something else, for example: maybe a permission framework or code access mechanism, maybe something that uses meta data like Attributes. I'm unsure. I don't really care whether the solution actually hides classes from each other or just makes them inaccessible, etc. A runtime or design time answer will suffice. Looking for something easy to implement otherwise it's not worth the effort ... Background: I'm working in an ASP.NET Website project and the team has decided not to use separate project assemblies for different software layers. Therefore I'm looking for a way to have, for example, a DataAccess/ folder of which I disallow its classes to access other Types in the ASP.NET Website project.

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• Can the LibreOffice LightProof grammar library be used externally?

  - by Phyxx

  LibreOffice 3.5 includes a grammar checker, called (or maybe based on) LightProof. From what I have read, LightProof seems to be a Python library that can be used to check for custom grammar rules. But I can not for the life of me find a project page for LightProof. The closest I got was http://cgit.freedesktop.org/libreoffice/lightproof/tree/, which seems to be the code for the LibreOffice extension, not LightProof itself. So is LightProof actually a library that can be implemented in other applications, or is it just a code word for a LibreOffice feature?

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• Capturing clicks even when stopPropagation has been called (ie by 3rd party code)?

  - by josh

  I want to detect any click that happens on a page (to close a custom context menu). I'm using jQuery and trying to do $(document).click(function(){ ...close my context menu ... }); However, I'm using some code that calls evt.stopPropagation() in the click handlers for certain elements on the page, and those clicks aren't making it up to my top-level handler. Is there any way of capturing those clicks? Can be jQuery or not jQuery, as long as it works cross-browser.

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• Rails 3 - Ideal way to set title of pages

  - by akfalcon

  Whats the proper way to set the page title in rails 3. Currently I'm doing the following: app/views/layouts/application.html .... <%= render_title % <%= csrf_meta_tag % .... app/helpers/application_helper.rb ... def render_title return @title if defined?(@title) "Generic Page Title" end ... app/controllers/some_controller.rb ... def show @title = "some custom page title" ... end ... Is there another/better way of doing the above?

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• Android: Problem with onMeasure()

  - by droid-test

  Hi I made a custom view. If I add the view to the layout XML file and I set the height to "fill_parent" "specSize" return 0. Why? Code: @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int measuredHeight = 90; int specMode = MeasureSpec.getMode(heightMeasureSpec); int specSize = MeasureSpec.getSize(MeasureSpec.getMode(heightMeasureSpec)); if(specMode != MeasureSpec.UNSPECIFIED){ measuredHeight = specSize; } setMeasuredDimension(60, measuredHeight); } Does anyone know how I can get the height of "fill_parent"? Thanks!

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• Why delegate types are derived from MulticastDelegate class why not it directly derive from Delegate class?

  - by Vijay

  I have a very basic question regarding delegate types. I compared the memebers of Delegate and MulticastDelegate classes in object browser and I couldn't find any new additional member present in MulticastDelegate. I also noticed that the Delegate class has GetInvocationList virtual method. So I assume that the Delegate class should have the capability to hold references to multiple methods. If my assumption is correct I wonder why not custom delegate types directly derive from the Delegate class instead of MulticastDelegate class. Not sure what I am missing here. Please help me understand the difference.

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• UITableViewCell get nil

  - by MTA

  I create a UITableView with custom UITableViewCell,this is how i create the cell in cellForRowAtIndexPath: static NSString *CellIdentifier = @"SongsCell"; SongsCell *cell = (SongsCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil){ UIViewController *vc = [[[UIViewController alloc] initWithNibName:@"SongsCell" bundle:nil] autorelease]; cell = (SongsCell *) vc.view; } now i want to get all cells in the table info (parameter from cell) when a button pressed: for (int i = 0; i < [songTable numberOfRowsInSection:0]; i++) { NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0]; UITableViewCell *cell = [songTable cellForRowAtIndexPath:indexPath]; } Now i have a problem that this loop give me for cell a nil for all the cell that currently not seen in the table.

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• Override existing AS3 classes

  - by purga

  For a custom derived class "Vector2" from flash.geom.Point, when trying to override the clone() method (similar to add(), subtract() methods that will return the type itself), it will always complain about incompatible overriding 'cuz the return type has been altered from "Point" to "Vector2". import flash.geom.Point; public class Vector2 extends Point { //Constructor is good public function Vector2(x:Number = 0, y:Number = 0) { super(x,y); } // Error: Incompatible overriding override public function clone():Vector2 //return type has to be "Point" { return new Vector2(this.x , this.y); } } How can we correctly reuse/override the methods provided by the super classes as supposed to create our own one (e.g. : a new clone1() method), or simply we just can't? Thanks.

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• Checking for a session variable... returns (Object reference not set to an instance of an object.)

  - by Chocol8

  In the Session_Start i have Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs) Session("login") = False End Sub and in a custom .aspx page i included the following... Public ReadOnly Property GetLoginState() As Boolean Get If Current.Session("login") Is Nothing Then Current.Session("login") = False End If Return Current.Session("login") End Get End Property Why i am getting error the error Object reference not set to an instance of an object. at line If Current.Session("login") Is Nothing Then while checking for the login state as follows? If GetLogin = False Then 'Do something End if I mean i have already created the instance on the Session_Start... Haven't i? What am i doing wrong here?

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• how to format (css) data loaded with $.load or $.get or $.ajax?

  - by user356981

  I need to load a piece of content html when an link in a menu is clicked; once loaded, the css format is not working properly, how do I re-format (re-styling via css) the loaded code? My code is: $('a', mainMenu).click(function() { ref = this.href; $('#content').load(ref + ' #content' function() { url = '../css/jquery-ui-1.8.2.custom.css'; //styling here if (document.createStyleSheet) document.createStyleSheet(url); else $('<link rel="stylesheet" type="text/css" href="'+url+'"/>').appendTo('head'); }); }) is it another way to load and re-style html (plugins perhaps)? thanks in adv'n.

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• Is it poor practice to identify objects via an enumeration property, instead of using GetType()?

  - by James

  I have a collection of objects that all implement one (custom) interface: IAuditEvent. Each object can be stored in a database and a unique numeric id is used for each object type. The method that stores the objects loops around a List<IAuditEvent>, so it needs to know the specific type of each object in order to store the correct numeric id. Is it poor practice to have an enumeration property on IAuditEvent so that each object can identify itself with a unique enumeration value? I can see that the simplest solution would be to write a method that translates a Type into an integer, but what if I need an enumeration of audit events for another purpose? Would it still be wrong to have my enumeration property on IAuditEvent?

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• mysql_close(): supplied argument is not a valid MySQL-Link resource

  - by maxedison

  I'm trying to get the hang of using custom session handlers to store session data in a MySQL database. However, I keep getting the following warning: mysql_close(): supplied argument is not a valid MySQL-Link resource Here's the code I'm using, which I got from here: function _open(){ global $_sess_db; $_sess_db = mysql_connect("localhost", "root", "******"); if ($_sess_db) { return mysql_select_db('style', $_sess_db); } return false; } function _close(){ global $_sess_db; return mysql_close($_sess_db); //error happens here } The full text of the error message ultimately points to the final "return mysql_close($_sess_db);" line. I can confirm that the mysql_connect info does in fact work, and I do have the rest of the session handler functions defined as well. And in case it helps, I get these errors immediately upon page load, without actually calling any of the session handler functions, and without having any current sessions open.

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• How can I get my app ready for the iPhone 5

  - by RazorSharp

  Apple just announced the iPhone 5 with a 4 inch screen and a 16:9 aspect ratio. Of course, they only give developers two weeks to scramble to update their apps without being able to test. I'd like to update my app for the iPhone 5's new big screen, but there's nothing on Apple's developer site about the iPhone 5 or making your apps ready for a larger screen. It would be a pain to have to write my own logic for testing whether the device is an iPhone 5 and then displaying a custom storyboard file for it. Does anyone know how the new sizing works or if there are any hidden Xcode for this?

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