Objective C内存管理问题
我在使用一些目标 C 代码在 IKImageBrowserView 上加载图像时遇到了这个问题。 我正在遵循苹果的图像浏览器示例,但我仍然在某些时候失败,我猜测它的内存管理。 这是一些代码:
/* Our datasource object */
@interface myImageObject : NSObject
{
NSString *_path;
}
@end
@implementation myImageObject
- (void)dealloc
{
[_path release];
[super dealloc];
}
/* our datasource object is just a filepath representation */
- (void)setPath:(NSString *)path
{
NSLog(@"setting path for %@",path);
if(_path != path)
{
[_path release];
_path = [path retain];
}
}
现在,看来我正确地保留了对象内的路径值。 现在来看控制器代码:
-(IBAction)loadMosaicImages:(id)sender
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSArray *urls = [openFiles() retain];
NSInteger n;
n = [urls count];
NSURL *url = [urls objectAtIndex:0];
[self parsePathForImages:[url path]];
[urls release];
[pool drain];
}
- (void)updateDatasource
{
NSLog(@" UDS-> _importedImages length : %@",[_importedImages count]);
//-- update our datasource, add recently imported items
[_images addObjectsFromArray:_importedImages];
//-- empty our temporary array
[_importedImages removeAllObjects];
NSLog(@" UDS-> _images length : %@",[_images count]);
//-- reload the image browser and set needs display
[_imageBrowser reloadData];
}
-(void)parsePathForImages:(NSString *)path{
NSLog(@"Directory within thread method is %@",path);
NSArray *content = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:nil];
myImageObject *p;
for(int i=0;i<content.count;i++)
{
// NSLog(@"%@",(NSString *)[content objectAtIndex:i]);
NSLog(@"Complete : %@",[path stringByAppendingPathComponent:(NSString *)[content objectAtIndex:i]]);
/* add a path to our temporary array */
p = [[myImageObject alloc] init];
[p setPath:[path stringByAppendingPathComponent:[content objectAtIndex:i]]];
[_importedImages addObject:p];
[p release];
}
[self updateDatasource];
}
这就是所有相关代码。 _images 和 _importedImages 是在 awake from nib 方法中分配和初始化的 NSMutableArrays,而 openFiles() 是一个静态方法,用于打开 NSOpenpanel 并返回路径的 NSArray。
其调试输出执行以下操作:
Directory within thread method is /Users/cromestant/Code/images/
Complete : /Users/cromestant/Code/images/1.jpg
setting path for /Users/cromestant/Code/images/1.jpg
Complete : /Users/cromestant/Code/images/2.jpg
setting path for /Users/cromestant/Code/images/2.jpg
Complete : /Users/cromestant/Code/images/3.jpg
setting path for /Users/cromestant/Code/images/3.jpg
。 。 。 然后在 NSLog 上的 updateDataSource 方法的第一行停止崩溃,并带有“EXEC_BAD_ACCESS”,那么我的内存管理哪里出了问题? 我似乎正在创建一个 autoreleasePool,所以我有时间保留在其他地方,我释放我的对象..我真的不知道问题可能出在哪里。 提前致谢。
I'm having this issue with some objective C code to load the images on a IKImageBrowserView.
I'm following the image browser example from apple, but I still fail at some point and Im guessing its memory management.
Here is some of the code:
/* Our datasource object */
@interface myImageObject : NSObject
{
NSString *_path;
}
@end
@implementation myImageObject
- (void)dealloc
{
[_path release];
[super dealloc];
}
/* our datasource object is just a filepath representation */
- (void)setPath:(NSString *)path
{
NSLog(@"setting path for %@",path);
if(_path != path)
{
[_path release];
_path = [path retain];
}
}
Now, It seems I'm properly retaining the path value within the object.
now on to the controller code:
-(IBAction)loadMosaicImages:(id)sender
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSArray *urls = [openFiles() retain];
NSInteger n;
n = [urls count];
NSURL *url = [urls objectAtIndex:0];
[self parsePathForImages:[url path]];
[urls release];
[pool drain];
}
- (void)updateDatasource
{
NSLog(@" UDS-> _importedImages length : %@",[_importedImages count]);
//-- update our datasource, add recently imported items
[_images addObjectsFromArray:_importedImages];
//-- empty our temporary array
[_importedImages removeAllObjects];
NSLog(@" UDS-> _images length : %@",[_images count]);
//-- reload the image browser and set needs display
[_imageBrowser reloadData];
}
-(void)parsePathForImages:(NSString *)path{
NSLog(@"Directory within thread method is %@",path);
NSArray *content = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:nil];
myImageObject *p;
for(int i=0;i<content.count;i++)
{
// NSLog(@"%@",(NSString *)[content objectAtIndex:i]);
NSLog(@"Complete : %@",[path stringByAppendingPathComponent:(NSString *)[content objectAtIndex:i]]);
/* add a path to our temporary array */
p = [[myImageObject alloc] init];
[p setPath:[path stringByAppendingPathComponent:[content objectAtIndex:i]]];
[_importedImages addObject:p];
[p release];
}
[self updateDatasource];
}
and that's all the relevant code. _images and _importedImages are NSMutableArrays alloced and inited in the awake from nib method, and openFiles() is a static method that opens an NSOpenpanel and returns an NSArray of the paths.
the debug output for this does this:
Directory within thread method is /Users/cromestant/Code/images/
Complete : /Users/cromestant/Code/images/1.jpg
setting path for /Users/cromestant/Code/images/1.jpg
Complete : /Users/cromestant/Code/images/2.jpg
setting path for /Users/cromestant/Code/images/2.jpg
Complete : /Users/cromestant/Code/images/3.jpg
setting path for /Users/cromestant/Code/images/3.jpg
.
.
.
then stops crashes at the first line of the method updateDataSource, on the NSLog with an 'EXEC_BAD_ACCESS'so where am I going wrong with the memory management?
I seem to be creating an autoreleasePool so ht I have time to retain somewhere else, I release my objects.. I really don't have a clue where the problem could be.
thanks in advance.
如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。

绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱,如果其他用户或者作者回复了您的评论,将不能在第一时间通知您!
发布评论
评论(1)
实际上,我认为你的问题可能不是内存管理。可能在这里:
应该是
因为
count
方法返回的是一个整数,而不是一个对象。Actually, I think your problem might not be memory management. It might be here:
It should be
because the
count
method returns an integer, not an object.