imageWithCGImage and memory

Posted by Adam Ernst on Stack Overflow See other posts from Stack Overflow or by Adam Ernst
Published on 2009-09-09T21:16:15Z Indexed on 2010/05/01 10:17 UTC
Read the original article Hit count: 382

Filed under:

cocoa-touch

|

core-graphics

If I use [UIImage imageWithCGImage:], passing in a CGImageRef, do I then release the CGImageRef or does UIImage take care of this itself when it is deallocated?

The documentation isn't entirely clear. It says "This method does not cache the image object."

Originally I called CGImageRelease on the CGImageRef after passing it to imageWithCGImage:, but that caused a malloc_error_break warning in the Simulator claiming a double-free was occurring.

© Stack Overflow or respective owner

Related posts about cocoa-touch

adding UIImageView to UIScrollView throws exception cocoa touch for iPad

as seen on Stack Overflow - Search for 'Stack Overflow'
I am a noob at OBJ-C :) I am trying to add a UIImageView to a UIScrollView to display a large image in my iPad app. I have followed the tutorial here exactly: http://howtomakeiphoneapps.com/2009/12/how-to-use-uiscrollview-in-your-iphone-app/ The only difference is that in my App the View is… >>> More
Cocoa Touch text view with aligned, justified text

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to create a textview with predefined height that will contain justified text. When entering the text into the view, I need to be able to check when the view is full. How would I do this? Core Text? I am using sdk-3.2. >>> More
Managing subviews in Cocoa Touch

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm developing an iPhone app. I need to create a Quiz application that has different Question views embedded in it (see my similar question). Different types of Question will have different behavior, so I plan to create a controller class for each type of Question. The MultipleChoiceQuestionController… >>> More
Reading .ppt (MS PowerPoint) file in Cocoa Touch

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All, Any idea how to read a .ppt file in Cocoa Touch ? I tried to load the contents of the file in UIWebView but it didn't work. Here is the code : [aWebView loadData:[NSData dataWithContentsOfFile:filePath] MIMEType:@"application/vnd.ms-powerpoint" textEncodingName:@"utf-8" … >>> More
Repeating events on a gregorian calendar in Cocoa Touch

as seen on Stack Overflow - Search for 'Stack Overflow'
How would I set up a gregorian calendar in cocoa touch and set an event that will repeat every X days? Thanks >>> More

Related posts about core-graphics

iPhone: CoreGraphics and memory management

as seen on Stack Overflow - Search for 'Stack Overflow'
Can someone tell me what I am doing wrong here? I use this method to flip through pages in a PDF. But something in the code seems to not be released properly because every-time I pull a PDF page that contains an image my memory footprint increases. I am fairly new to CoreGraphics, and can't for the… >>> More
Core Graphics Rotating a Path

as seen on Stack Overflow - Search for 'Stack Overflow'
This should be a simple one, basically I have a few paths drawn with core graphics, and I want to be able to rotate them (for convenience). I've tried using CGContextRotateCTM(context); but it's not rotating anything. Am I missing something? Here's the source for drawRect - (void)drawRect:(CGRect)rect… >>> More
[iPhone] CoreGraphics rounded corner thickness

as seen on Stack Overflow - Search for 'Stack Overflow'
Whenever I stroke a path with rounded corners on iPhone, the rounded corners are thicker than the rest of the stroked path. See here for what I mean: Not sure why this happens, any ideas? >>> More
How would I draw something like this in Core Graphics

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to be able to draw using this as my stroke. How would I do this as efficient as possible, and on the fly drawing, I was thinking CGPatternRef, but I really don't know how to do that. Edit: It does not need to warp to the path. I just coultn't fix that issue in Illustrator. >>> More
CoreGraphics rounded corner thickness

as seen on Stack Overflow - Search for 'Stack Overflow'
Whenever I stroke a path with rounded corners on iPhone, the rounded corners are thicker than the rest of the stroked path. See here for what I mean: Not sure why this happens, any ideas? >>> More