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• How do I calculate the offset, in hours, of a given timezone from UTC in ruby?

  - by esilver

  I need to calculate the offset, in hours, of a given timezone from UTC in Ruby. This line of code had been working for me, or so I thought: offset_in_hours = (TZInfo::Timezone.get(self.timezone).current_period.offset.utc_offset).to_f / 3600.0 But, it turns out that was returning to me the Standard Offset, not the DST offset. So for example, assume self.timezone = "America/New_York" If I run the above line, offset_in_hours = -5, not -4 as it should, given that the date today is April 1, 2012. Can anyone advise me how to calculate offset_in_hours from UTC given a valid string TimeZone in Ruby that accounts for both standard time and daylight savings? Thanks!

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• Model's method not being recognized when called

  - by Brian Roisentul

  I'm using ruby on rails 2.3.2 and also using the acts_as_taggable_on puglin. That generated me two db tables: tags and taggings. As I didn't need anything more from those, I didn't create a Tag model, for example. Now the project is more mature, I need to create some methods for tags, so I created a Tag model with some methods in it. The model looks something like this: class Tag < ActiveRecord::Base def self.get_parent parent = Tag.find(self.parent_id) return parent end end When I call it from a controller, it won't find the method. This is the code: tag = Tag.find(tag_id) the_parent = tag.get_parent This will throw an error saying: undefined method `get_parent' for #<Tag id: 13, name: "Historia", parent_id: 12> I don't know what's wrong. Any help will be appreciated.

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• How to pass an int value on UIButton click inside UITableView

  - by Toran Billups

  So I have a view controller with a single UITableView that shows a string to the user. But I needed a way to have the user select this object by id using a normal UIButton so I added it as a subview and the click event works as expected. The issue is this - how can I pass an int value to this click event? I've tried using attributes of the button like button.tag or button.accessibilityhint without much success. How do the professionals pass an int value like this? Also it's important that I can get the actual [x intValue] from the int later in the process. A while back I thought I could do this with a simple NSLog(@"the actual selected hat was %d", [obj.idValue intValue]); But this doesn't appear to work (any idea how I can pull the actual int value directly from the variable?). The working code I have is below - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } if ([self.hats count] > 0) { Hat* obj = [self.hats objectAtIndex: [indexPath row]]; NSMutableString* fullName = [[NSMutableString alloc] init]; [fullName appendFormat:@"%@", obj.name]; [fullName appendFormat:@" %@", obj.type]; cell.textLabel.text = fullName; cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton; //add the button to subview hack UIButton* button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; button.frame = CGRectMake(50, 5, 50, 25); [button setTitle:@"Select" forState:UIControlStateNormal]; button.backgroundColor = [UIColor clearColor]; button.adjustsImageWhenHighlighted = YES; button.tag = obj.idValue; //this is my current hack to add the id but no dice :( [button addTarget:self action:@selector(action:) forControlEvents:UIControlEventTouchUpInside]; [cell.contentView addSubview:button]; //hack } return cell; } - (void)action:(id)sender { int* hatId = ((UIButton *)sender).tag; //try to pull the id value I added above ... //do something w/ the hatId }

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• Is it possible to Prevent TO fileld to be edit in MFMailComposeViewController

  - by mihirpmehta

  in my Application i am using MFMailComposeViewController for emails... I am Adding to Field in it programmaticly... I want To prevent user to edit the TO field, User can't change TO field's email address... I am not able to find neither i know if it is possible or not It is not necessary but still code is NSArray *arr = [NSArray arrayWithObject:Emailstr]; MFMailComposeViewController* controller = [[MFMailComposeViewController alloc] init]; controller.mailComposeDelegate = self; [controller setToRecipients:arr]; [controller [controller setMessageBody:@"Hello there." isHTML:NO]; [self presentModalViewController:controller animated:YES];

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• Objective-c for the iphone: Mystery memory leak

  - by user200341

  My application seems to have 4 memory leaks (on the device, running instruments). The memory leaks seems to come from this code: NSURL *url = [self getUrl:destination]; [destination release]; NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url]; [url release]; [request setHTTPMethod:@"GET"]; [request addValue:@"application/json" forHTTPHeaderField:@"content-type"]; NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self]; [request release]; [connection release]; I am releasing all my objects as far as I can see but it's still showing this as the source of the 4 memory leaks. This is on the Device running 3.1.3 Is it acceptable to have a few memory leaks in your app or do they all have to go?

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• Link a programmatic instantiation of class x in class y to a view controller of class x

  - by Joel Derfner

  I have classes Compose and Haiku, each connected to a view controller in IB. Haiku is instantiated in Compose as ghhaiku. Haiku has an array, self.arrayOfHaiku, with 117 members. But in Compose, self.ghhaiku.arrayOfHaiku has no members. I think the problem is that I haven't linked the instance of Haiku that has the 117-member array with the instance of Haiku created in Compose. But how do I do that? (I could of course be totally wrong and the problem could be something else, but that seems to make intuitive sense.) Any thoughts?

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• Why can I create a table with PRIMARY KEY on a nullable column?

  - by AlexKuznetsov

  The following code creates a table without raising any errors: CREATE TABLE test( ID INTEGER NULL, CONSTRAINT PK_test PRIMARY KEY(ID) ) Note that I cannot insert a NULL, as expected: INSERT INTO test VALUES(1),(NULL) ERROR: null value in column "id" violates not-null constraint DETAIL: Failing row contains (null). ********** Error ********** ERROR: null value in column "id" violates not-null constraint SQL state: 23502 Detail: Failing row contains (null). Why can I create a table with a self-contradictory definition? ID column is explicitly declared as NULLable, and it is implicitly not nullable, as a part of the PRIMARY KEY. Does it make sense? Edit: would it not be better if this self-contradictory CREATE TABLE just failed right there?

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• Pygame - Different sided collision question!

  - by Alex Lockwood

  Hi there everyone! I'm making a Pygame of, basically, "Breakout". I'm using collisions, and want a simple way to have different bounce effects of the different sides of one rectangle. What I currently have for the ball-to-bat collision is this: "dot" = ball; "bat" = bat; so you all understand. if dot.rect.colliderect(bat.rect):<br> dot.dy *= -1 I'd like something that interacts with each side, so could reverse the self.dx value of the ball when it hits the side of the bat, and only reversing the self.dy value when it strikes the top. Thanks!!! :D

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• UIButton does not respond to touch events after changing its position using setFrame

  - by Pranathi

  I have a view controller class (child) which extends from view controller class (parent). In the parent class's loadView() method I create a sub-view (named myButtonView) with two buttons (buttons are horizontally laid out in the subview) and add it to the main view. In the subclass I need to shift these two buttons up by 50pixels. So, I am shifting the buttonView by calling the setFrame method. This makes the buttons shift and render properly but they do not respond to touch events after this. Buttons work properly in the views of Parent class type. In the child class type view also, if I comment out the setFrame() call the buttons work properly. How can I shift the buttons and still make them respond to touch events? Any help is appreciated. Following is snippets of the code. In the parent class: - (void)loadView { // Some code... CGRect buttonFrameRect = CGRectMake(0,yOffset+1,screenRect.size.width,KButtonViewHeight); myButtonView = [[UIView alloc]initWithFrame:buttonFrameRect]; myButtonView.backgroundColor = [UIColor clearColor]; [self.view addSubview:myButtonView]; // some code... CGRect nxtButtonRect = CGRectMake(screenRect.size.width - 110, 5, 100, 40); myNxtButton = [UIButton buttonWithType:UIButtonTypeCustom]; [myNxtButton setTitle:@"Submit" forState:UIControlStateNormal]; myNxtButton.frame = nxtButtonRect; myNxtButton.backgroundColor = [UIColor clearColor]; [myNxtButton addTarget:self action:@selector(nextButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; [myButtonView addSubview:myNxtButton]; CGRect backButtonRect = CGRectMake(10, 5, 100, 40); myBackButton = [UIButton buttonWithType:UIButtonTypeCustom]; [myBackButton setTitle:@"Back" forState:UIControlStateNormal]; myBackButton.frame = backButtonRect; myBackButton.backgroundColor = [UIColor clearColor]; [myBackButton addTarget:self action:@selector(backButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; [myButtonView addSubview:myBackButton]; // Some code... } In the child class: - (void)loadView { [super loadView]; //Some code .. CGRect buttonViewRect = myButtonView.frame; buttonViewRect.origin.y = yOffset; // This is basically original yOffset + 50 [myButtonView setFrame:buttonViewRect]; yOffset += KButtonViewHeight; // Add some other view below myButtonView .. }

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• Can I use string concatenation to define a class CONST in PHP?

  - by selfsimilar

  I know that you can create global constants in terms of each other using string concatenation: define('FOO', 'foo'); define('BAR', FOO.'bar'); echo BAR; will print 'foobar'. However, I'm getting an error trying to do the same using class constants. class foobar { const foo = 'foo'; const foo2 = self::foo; const bar = self::foo.'bar'; } foo2 is defined without issue, but declaring const bar will error out Parse error: syntax error, unexpected '.', expecting ',' or ';' I've also tried using functions like sprintf() but it doesn't like the left paren any more than the string concatenator '.'. So is there any way to create class constants in terms of each other in anything more than a trivial set case like foo2?

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• Problem with accessing classes from another class.

  - by srikanth rongali

  I have a classA, classB,classC. I have another class classABC; All are CCLayer inherited. I need to call all the classA, classB, classC from classABC. #import <Foundation/Foundation.h> #import "cocos2d.h" @interface classABC : CCLayer { classA *aClass; } @property(nonatomic, retain)classA *aClass; @end #import "classABC" #import "classA.h" #import "classB.h" #import "classC.h" @implementation classABC -(id)init { if( (self = [super init]) ) { ClassA *aClass = [[ClassA alloc]init]; CCScene *aClassS = [CCScene node]; CCLayer * aClassL = [aClass node]; [aClassS addChild: aClassL]; [[CCDirector sharedDirector] setAnimationInterval:60.0/60]; [[CCDirector sharedDirector] replaceScene: aClass]; } return self; } @end But I am not getting the classA displayed. How should I do it ? Thank You.

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• super(type,subclass) in simple singleton implementation

  - by Tianchen Wu

  when I was implementing naive singleton in python, I came up with a problem with super key word. As usual the behavior of super is always tricky and buggy, hope someone can shed light on it. Thanks :) The problem is that: class Singleton(object): def __new__(cls,*args,**kw): if not hasattr(cls,'_instance'): #create a instance of type cls, origin=super(Singleton,Singleton).__new__(cls,*args,**kw) cls._instance=origin return cls._instance class B(Singleton): def __init__(self,b): self.b=b It actually works, but I am wondering Will it be better if I change line 5 to the below, like in most of the books? origin=super(Singleton,cls).__new__(cls,*args,**ks) what's the difference to make?

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• UIWebView in full screen hides status bar

  - by iPhone

  I am opening video in UIWebView with following code. - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { NSLog(@"Navigatin Type %d %@",navigationType, request); if (navigationType == 0) { self.navigationItem.leftBarButtonItem = backBarBtn; [self showVideoInWebView:[request.URL absoluteString]]; return NO; } return YES; } -(void)showVideoInWebView:(NSString *)urlStr { [mainWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlStr]]]; } but when my mainWebView opens in full screen it hides my status bar. I don't want to hide status bar then how can I show my status bar?

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• Drupal: cusomizing modules question

  - by Patrick

  hi, I've a question about how to customize drupal modules avoiding hacks. Let's say I've downloaded Lightbox2 module and I want to change the javascript file to display differently my lightbox. At the moment I'm modifying the Lightbox2 module, so I cannot update it anymore, so I know it is not the best practice. I was wondering if I can customize the javascript file of this module with a hook, and how. Thanks

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• iPhone Application crashing upon loading a new Detail View

  - by Jeb Sears

  Hi, My problem is when trying to load a detail view through a table cell, the application constantly crashes. The error that comes up when running through debug is "__TERMINATING_DUE_TO_UNCAUGHT_EXCEPTION___" objc exception thrown. If anyone can help me it would be greatly appreciated. Here is a screenshot for the debug, I am not sure if I am interpreting it right http://img43.imageshack.us/img43/2143/errorud.png Here is my code where I beleive the error is happening: - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSInteger row = [indexPath row]; if(self.moreDetailView == nil){ DetailViewController *dvController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:[NSBundle mainBundle]]; self.moreDetailView = dvController; [dvController release]; } else{} moreDetailView.title = [NSString stringWithFormat:@"%@", [listOfItems objectAtIndex:row]]; goHerdv2AppDelegate *delegate = [[UIApplication sharedApplication] delegate]; [delegate.detailView pushViewController:moreDetailView animated:YES];}

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• Make a call in Objective C help!

  - by Henry D'Andrea

  I need to make a call where it says add call here. Can someone help? (BOOL) webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)ntype { NSLog(@"Scheme: %@", request.URL.scheme); if ([request.URL.scheme isEqualToString:@"save"]) { //Add Call here } return true; } FROM this code- (void) save { UIGraphicsBeginImageContext(self.view.frame.size); [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil); NSLog(@"TEST"); }

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• Adding a method to a function object at runtime

  - by Carson Myers

  I read a question earlier asking if there was a times method in Python, that would allow a function to be called n times in a row. Everyone suggested for _ in range(n): foo() but I wanted to try and code a different solution using a function decorator. Here's what I have: def times(self, n, *args, **kwargs): for _ in range(n): self.__call__(*args, **kwargs) import new def repeatable(func): func.times = new.instancemethod(times, func, func.__class__) @repeatable def threeArgs(one, two, three): print one, two, three threeArgs.times(7, "one", two="rawr", three="foo") When I run the program, I get the following exception: Traceback (most recent call last): File "", line 244, in run_nodebug File "C:\py\repeatable.py", line 24, in threeArgs.times(7, "one", two="rawr", three="foo") AttributeError: 'NoneType' object has no attribute 'times' So I suppose the decorator didn't work? How can I fix this?

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• Easy Slider 1.7 - Show any numerical slide as next

  - by Yourbudweiser

  I am using Easy Slider 1.7 - jQuery plugin and have made many modifications. My slider contains 7 slides, numeric navigation and next and previous arrows. The only problem is the numeric navigation. When you are on slide 1 and click slide 5, for example, all the slides scroll by, one-by-one. I am having trouble modifying the code so that whatever slide you are on, when you click another slide, it is the next one. Sample here: http://www.weiserwebworld.com/slider.html

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• Change UIView alpha value

  - by Ask

  I'm trying to create an UIView and change its alpha property to simulate backlight change. Here is my code if (TransparentView == nil) { TransparentView = [[UIView alloc] initWithFrame:self.view.bounds]; TransparentView.backgroundColor = [UIColor whiteColor]; self.view = TransparentView; } start=start+appDelegate.OnOffTime; TransparentView.alpha = 0.2; float step = 1.0 / ( appDelegate.OnOffTime * 100); for (float f = 0; f < 1; f=f+step) { TransparentView.alpha = (CGFloat)(1 - f); [NSThread sleepForTimeInterval:0.01]; } Both TransparentView.alpha = 0.2 and TransparentView.alpha = (CGFloat)(1 - f) do change TransparentView.alpha, but only TransparentView.alpha = 0.2 changes real device "brightness'. What am I doing wrong?

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• Prevent Erroneous Property Assignment

  - by Gordon

  Porting android applications to iphone applications always gives me the following pattern that I accidentally create: - (void) myFunc:(id)prop { self.property = property; } Which instead should be: - (void) myFunc:(id)prop { self.property = prop; } This always causes my program to quietly break because property gets reset to its existing value rather than being set to the new value, 'prop'. I cannot name the parameter 'prop' to 'property' since the compile complains that the parameter masks the instance variables visibility. Is there a good way to avoid this situation? There are no compiler warnings. Is there a way to make xcode prevent this? I cannot see very many situations where you would set a property to the value of its underlying instance variable (maybe to trigger a KVO binding?), but I don't see myself doing that in majority of cases. I understand the above code is synthetic and should be done with @synthesize, but I am just using it as a simplified example to illustrate my point.

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• Problem in creating another thread

  - by Avinash

  Hi, I am using NSThread to create different thread and displaying images in my application on a new thread instead of main thread. On main thread i am working with a table view which is displaying data from XML file, In the same view I am displaying images below. But, displaying images on new thread is not working properly. Did i made any mistake in creating Here below is my code. Please help me its urgent. Thanks in advance...................... - (void)viewDidLoad { [super viewDidLoad]; [NSThread detachNewThreadSelector:@selector(startTheBackgroundJob) toTarget:self withObject:nil]; } - (void)startTheBackgroundJob { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; currentLocationImageView = [[UIImageView alloc] init]; NSArray *images = [NSArray arrayWithObjects:img1, img2, nil]; [currentLocationImageView setAnimationImages:images]; [currentLocationImageView setAnimationRepeatCount:0]; [currentLocationImageView setAnimationDuration:5.0]; [self.view addSubview:currentLocationImageView]; [pool release]; }

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• "rake test" doesn't load fixtures?

  - by Pavel K.

  when i run rake test --trace here's what happens ** Invoke test (first_time) ** Execute test ** Invoke test:units (first_time) ** Invoke db:test:prepare (first_time) ** Invoke db:abort_if_pending_migrations (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:abort_if_pending_migrations ** Execute db:test:prepare ** Invoke db:test:load (first_time) ** Invoke db:test:purge (first_time) ** Invoke environment ** Execute db:test:purge ** Execute db:test:load ** Invoke db:schema:load (first_time) ** Invoke environment ** Execute db:schema:load ** Execute test:units /usr/bin/ruby1.8 -I"lib:test".... (and after that fails because there's no fixtures loaded) why doesn't it load fixtures (i thought that would be default behaviour) and how do i make it load fixtures before executing tests??? p.s. my test/test_helper.rb content is: ENV["RAILS_ENV"] = "test" require File.expand_path(File.dirname(__FILE__) + "/../config/environment") require 'test_help' class ActiveSupport::TestCase self.use_transactional_fixtures = true self.use_instantiated_fixtures = false fixtures :all end (rails 2.3.4)

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• PHP OOP: method?

  - by Isis

  Hello <?php class Templater { static $params = array(); public static function assign($name, $value) { self::$params[] = array($name => $value); } public static function draw() { self::$params; } } $test = Templater::assign('key', 'value'); $test = Templater::draw(); print_r($test); How to alter this script so I could use this:? $test = Templater::assign('key', 'value')->assign('key2', 'value2')-draw(); print_r($test);

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• can't save form content to database, help plsss!!

  - by dana

  i'm trying to save 100 caracters form user in a 'microblog' minimal application. my code seems to not have any mystakes, but doesn't work. the mistake is in views.py, i can't save the foreign key to user table models.py looks like this: class NewManager(models.Manager): def create_post(self, post, username): new = self.model(post=post, created_by=username) new.save() return new class New(models.Model): post = models.CharField(max_length=120) date = models.DateTimeField(auto_now_add=True) created_by = models.ForeignKey(User, blank=True) objects = NewManager() class NewForm(ModelForm): class Meta: model = New fields = ['post'] # widgets = {'post': Textarea(attrs={'cols': 80, 'rows': 20}) def save_new(request): if request.method == 'POST': created_by = User.objects.get(created_by = user) date = request.POST.get('date', '') post = request.POST.get('post', '') new_obj = New(post=post, date=date, created_by=created_by) new_obj.save() return HttpResponseRedirect('/') else: form = NewForm() return render_to_response('news/new_form.html', {'form': form},context_instance=RequestContext(request)) i didn't mention imports here - they're done right, anyway. my mistake is in views.py, when i try to save it says: local variable 'created_by' referenced before assignment it i put created_py as a parameter, the save needs more parameters... it is really weird help please!!

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• How to censor IP addresses in a file with Python?

  - by Julio

  Hello everyone. I have a log file containing some Whois entries with relative IP addresses which I want to censor like: 81.190.123.123 in 81.190.xxx.xxx. Is there a way to make such a conversion and rewrite the file contents without modifying the rest? Thank you for the help!

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