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• Objective c: How to use memory managment properly for asynchronous methods

  - by user296446

  I need to call a method that starts some asynchronous code MyClass* myClass = [[MyClass alloc] init]; [myClass startAsynchronousCode]; Now I cant simply release it as this would cause an error since the code is still running: [myClass release]; // causes an error What is the best way to deal with the memory?

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• disable Opera function key in javascript

  - by DonDon

  I'm writing javascript code for a web emulator containing function keys. The user is able to press keyboard function keys to process something in the emulator, I used stopPropagation and preventDefault javascript function to stop/cancel browsers invoking their function key shortcut (e.g. F1 will invoke Firefox to open its help page) and the code works fine under Firefox and Chrome. But Opera didn't work. I'm using latest Opera 10.5 here. Can anyone help ?

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• CSS Error when using jQuery's gt() selector?

  - by kimka

  I've noticed that Firefox throws me a warning on the following jQuery code: $("li.example div.code:gt(4)").hide(); CSS Error: Unknown pseudo-class or pseudo-element 'gt'. According to jQuery, it all should be correct. And it works, but I wonder how to fix this error for cleanness sake.

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• HTML5 Playlist plays 2 videos, How about 4 or 5?

  - by amber

  I'm able to get two videos to play sequentially, (and without pause!) with this code from Apple, (see section 2-4)... http://developer.apple.com/safari/library/documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/ControllingMediaWithJavaScript/ControllingMediaWithJavaScript.html ...Yet completely lost as to how to play a 3rd or 5th video. Trouble is I'm a Javascript noob :-(, so if you figure this out please share as much of your code as possible. Thanks much!

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• Strange (atleast for me) behavior in Django template

  - by lud0h

  The following code snippet in a Django template (v 1.1) doesn't work. {{ item.vendors.all.0 }} == returns "Test" but the following code snippet, doesn't hide the paragraph! {% ifnotequal item.vendors.all.0 "Test" %} <p class="view_vendor">Vendor(s): {{item.vendors.all.0}} </p><br /> {% endifnotequal %} Any tips on what's wrong? Thanks.

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• using thread to load xsl transformation gives error.

  - by infant programmer

  I had to use threading to avoid "XSL Compilation time-out error" Now the problem I am facing is: It gives error, saying the output-string(generated as a result of transformation) is null!! Here is my C# code : [click_me] And the errors I am getting is copied in this text file : [click_me] And the original code without threading .. [click_me]

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• C# - Printing the Form

  - by Jon

  I am using the code from MS to print a form however it looks like the form needs to be visible with a Show/ShowDialog() to work. I am trying to use the code for a form that I don't want to show. Any ideas?

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• Easiest way to choose a percentage of an amount of rows from a MySQL table?

  - by Rob

  I have a script that has a GET variable: $_GET['percentage'] I have a MySQL table of data. Now lets say that there are 100 rows of data in this table. In pseudo-code: SELECT data FROM table Now would it be possible to select $_GET['percentage'] of random data from table? For example (again in pseudo-code): $_GET['percentage'] = 10; SELECT 10% of data from table order by rand() If this IS possible, how could I do it?

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• [iPhone Obj-C] How to move a label with the wave of the iPhone?

  - by Didi

  The code below is from the book Beginning iPhone 3 Development, chapter 15, using the accelerometer to control a ball. I want to use a label instead of the ball, and only move in the x direction. However, I donno how to revise the code to achieve this goal. Can anyone please help me? THX so much!!!! (id)initWithCoder:(NSCoder *)coder { if (self = [super initWithCoder:coder]) { self.image = [UIImage imageNamed:@"ball.png"]; self.currentPoint = CGPointMake((self.bounds.size.width / 2.0f) + (image.size.width / 2.0f), (self.bounds.size.height / 2.0f) + (image.size.height / 2.0f)); ballXVelocity = 0.0f; ballYVelocity = 0.0f; } return self; } (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { // Initialization code } return self; } (void)drawRect:(CGRect)rect { // Drawing code [image drawAtPoint:currentPoint]; } (void)dealloc { [image release]; [acceleration release]; [super dealloc]; } //#pragma mark - - (CGPoint)currentPoint { return currentPoint; } - (void)setCurrentPoint:(CGPoint)newPoint { previousPoint = currentPoint; currentPoint = newPoint; if (currentPoint.x < 0) { currentPoint.x = 0; //ballXVelocity = 0; ballXVelocity = - (ballXVelocity / 2.0); } if (currentPoint.y < 0){ currentPoint.y = 0; //ballYVelocity = 0; ballYVelocity = - (ballYVelocity / 2.0); } if (currentPoint.x > self.bounds.size.width - image.size.width) { currentPoint.x = self.bounds.size.width - image.size.width; //ballXVelocity = 0; ballXVelocity = - (ballXVelocity / 2.0); } if (currentPoint.y > self.bounds.size.height - image.size.height) { currentPoint.y = self.bounds.size.height - image.size.height; //ballYVelocity = 0; ballYVelocity = - (ballYVelocity / 2.0); } CGRect currentImageRect = CGRectMake(currentPoint.x, currentPoint.y, currentPoint.x + image.size.width, currentPoint.y + image.size.height); CGRect previousImageRect = CGRectMake(previousPoint.x, previousPoint.y, previousPoint.x + image.size.width, currentPoint.y + image.size.width); [self setNeedsDisplayInRect:CGRectUnion(currentImageRect, previousImageRect)]; } (void)draw { static NSDate *lastDrawTime; if (lastDrawTime != nil) { NSTimeInterval secondsSinceLastDraw = -([lastDrawTime timeIntervalSinceNow]); ballYVelocity = ballYVelocity + -(acceleration.y * secondsSinceLastDraw); ballXVelocity = ballXVelocity + acceleration.x * secondsSinceLastDraw; CGFloat xAcceleration = secondsSinceLastDraw * ballXVelocity * 500; CGFloat yAcceleration = secondsSinceLastDraw * ballYVelocity * 500; self.currentPoint = CGPointMake(self.currentPoint.x + xAcceleration, self.currentPoint.y +yAcceleration); } // Update last time with current time [lastDrawTime release]; lastDrawTime = [[NSDate alloc] init]; }

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• Best practices for handling binary data in Ruby?

  - by StackedCrooked

  What are the best practices for reading and writing binary data in Ruby? In the code sample below I needed to send a binary file using over HTTP (as POST data): f = File.new("resp.der", "r") # binary file begin while true out.syswrite(f.sysread(1)) # out is an output stream (type IO) end rescue EOFError => err puts "Sent response." end While this code seems to do a good job, it probably isn't very idiomatic. How can I improve it?

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• How to resize an image smoothly (with resampling) using Windows API calls?

  - by Clay Nichols

  I need to resize images and resample them so they don't end up all jagged (I think that's called aliasing). I found some code (sorry, lost the link) that does this in pure VB6 code but it's a bit slow (2-5 seconds) and I'm displaying pictures in real time so I need something faster. I seem to recall seeing some examples of doing this with the GDI+ library. An example in VB6 would be ideal, but I can probably work with a simple example with Windows API calls in another language.

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• PHP turn off errors - in one file only

  - by Industrial

  Hi! I am well aware about error_reporting(0); & ini_set('display_errors', "Off"); to make error messages go away. What would be an appropriate way to do this - for a specific file or part of code only? Surpressing errors with @'s seems like a bad idea since it apparently slows the code down... Thanks!

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• Graph of included files

  - by Dacav

  When I work on someone else's code, I tipically need to abuse of grep in order to find data types declarations etc, and this usually makes me confused. I'd like to have some tool which analyzes the source code and produces some graphviz-like drawing and allows me to follow dependencies. Also I've found this on the internet, but I think is taylored for the linux kernel only.

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• sql server: looking for table usage through out database...

  - by dotnet-practitioner

  How would I figure out what type of sql code such as procs, functions, views etc. are interacting with my table called TABLE1 through out a given database. Sample code would be very helpful for me. thanks

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• Looping through an array while adding the data to a string and finally returning it, a faster way?

  - by Hadi

  Getting the customer's to_s method by looping through Is there a Ruby idiom to write the code in 1 line (or shorter than 3 lines of code)? def method string = "" @customers.each { |customer| string += customer.to_s + "\n" } string end

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• LAbeling with Percentage in R plot

  - by Libo Cannici

  Hi I have made this function that takes a table and prepare the label for a barplot prepare_labels <- function(ft){ labs <- ft labs <- paste(labs, "\n", sep="") labs <- paste(labs, round(prop.table(ft)*100,2), sep="") labs <- paste(labs, "%", sep="") return(labs) } It actually works fine, but is there any better way to write that function, the above code looks ugly and I want to write beautiful code :-) ex: ft <- table(mydata$phone_partner_products) prepare_labels(ft) [1] "3752\n34.09%" "226\n2.05%" "2907\n26.41%" "1404\n12.76%" "1653\n15.02%" [6] "1065\n9.68%"

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• High accuracy cpu timers

  - by John Robertson

  An expert in highly optimized code once told me that an important part of his strategy was the availability of extremely high performance timers on the CPU. Does anyone know what those are and how one can access them to test various code optimizations? While I am interested regardless, I also wanted to ask whether it is possible to access them from something higher than assembly (or with only a little assembly) via visual studio C++?

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• outllook addin threading issues

  - by Sanju

  hi i am having threading issues in my vsto project // code for function var threadUpdate = new Thread(_fun){IsBackgroud = true}; threadUpdate.Start(); threadList.add(threadUpdate); // code for progressbar Progressbar pb = new Prgressbar(){Title =@"abc"} pb.Show() it was working in perfect condition before i add wpf progress bar. as the plugin has been running as single thread can i ask how can running multi threading in outlook thanks

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• Creating Simple desktop database application

  - by KoolKabin

  Hi guys, I am here to write a small database application that will be running in desktop (offline mode). I am using MSAccess 2007 as my database file and trying to write code in vb.net. I used to write the code vb6 an usually had global variables for storing database connection and executing every query from that. I am trying to upgrade myself from vb6 to vb.net. do i need to read some more simple starter books also?

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• [Facebook Graph API - Android] I want to know the HTTPSConnection redirected to which URL?

  - by Mohammad Abdelaziz

  I am building an application that uses the Facebook Graph API. To get the access token I should send the following request https://graph.facebook.com/oauth/authorize? client_id=...& redirect_uri=http://www.example.com/callback It redirects to the redirect_uri with the code to be used as access token. How can I capture that the HttpsURLConnection is redirected and how to get the code? Is it possible or I need to have server that gets the access token?

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• iphone shake error

  - by aaa

  Right now I have this- [code] - (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event { if (event.type == UIEventSubtypeMotionShake) { int text = rand() % 12; switch (text) { case 0: textview.text = @"blah." ; break;[/code] For some reason, the text has to be selected for it to work. If you just shake it, nothing will happen.

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• Flash button not reacting at all...

  - by Jerre

  Hi, I'm making a game in Flash for school. I have a few dialog boxes that work just fine! Now I need a bigger one with more buttons and with the same code, I can't even get a trace reaction... My code: On the button itself: okButton.addEventListener(MouseEvent.CLICK,MovieClip(parent).clickMyButton); In the AS file: public function clickMyButton(event:MouseEvent) { trace("Halloooo"); } Another question: How can I close (remove from stage) a child dialog box (movie clip)

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• What's the best way to learn about programming security-related topics? (PHP)

  - by user300371

  I am currently building a site and all the books I have read on PHP so far are just on functionality and not much on security. Is there a book that deals specifically with making your code/site secure? I don't want to go public and the next day have all my code changed or my database erased by SQL injection. thanks

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• Calling a function in the Form Class from another Class, C# .NET

  - by mouthpiec

  Hi, Can someone please let me know by some code how I can call a function located in the Form class from another class? Some code will be of great help! thanks

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• What is the most robust way of determining the current codepage from a shell script?

  - by rewbs

  Hi all, I'd like to determine the environment's current codepage at runtime from a Unix shell script. What's the most reliable way of doing this? I'm looking into parsing environment variable $LC_ALL, but it isn't always set to a useful value, and its format seems to vary (can be <locale, or <locale.<code page, or <locale.<code page@<modifier etc...). Is there a better way? I'm essentially after a shell equivalent of what I'd get if I called nl_langinfo(CODESET) from C.

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