Re: iphone large image downloading
Hi all,
I have modified my code to send asynchronous request using the below
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:
[NSURLRequest
requestWithURL:
[NSURL
URLWithString:strURL]] delegate:self];
- (void)connection:(NSURLConnection *)connection didReceiveData:
(NSData *)data
{
[self.activeDownload appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// Set appIcon and clear temporary data/image
UIImage *image = [[UIImage alloc]
initWithData:self.activeDownload];
if (image != nil)
{
self.appRecord.appIcon = image;
}
else
{
self.appRecord.appIcon = [UIImage
imageNamed:@image_not_available.png];
}
[image release];
// Release the connection now that it's finished
self.imageConnection = nil;
// call our delegate and tell it that our icon is ready for display
[delegate appImageDidLoad:self.indexPathInTableView];
[delegate appSingleImageDidLoad:rowNumber];
self.activeDownload = nil;
// show in the status bar that network activity is starting
[UIApplication sharedApplication].networkActivityIndicatorVisible
= NO;
}
In simulator I am able to run the application without any crashes.
But in device it is taking long time to download the first image, and
from second image the application is getting crashed.
I have seen crash reports , and it is of type low memory.
Can any one suggest me how to handle this situation?
Also, I have overridden didReceiveMemoryWarning and added an
alertview, it is not getting called.
Thanks in advance.
Thanks,
Santhosh Kumar Gundu
On Aug 12, 2010, at 2:19 AM, David Duncan wrote:
On Aug 11, 2010, at 12:46 AM, SanthoshKumarGundu wrote:
Can any one have an idea of what is the maximum image limit(size
and resolution) in iphone?.
There are some images in web server. In my application , I am
getting these as NSData (one image at a time) and displaying the
image using the following code
NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL
URLWithString:imageURLString]];
UIImage *sampleImage = [UIImage imageWithData:imageData];
This is working fine for small images ( upto 1MB of size and
resolution of 1024*1024).
But for large images ( 3MB size and resolution of 2500*2500), the
application is getting crashed.
What kind of crash are you getting? I would bet that the exception
code is 0x8badf00d (see TN2151 for information on what that means
and how to read crash reports).
You are actually pretty lucky that the first version works at all,
and I bet that if you are on a slow or broken network that it won't
work and you will get a similar crash.
Generally any using -initWithContentsOfURL: for remote URLs will
fail if you are trying to do so on the main thread (and if you are
using UIKit, you are probably trying to do so on the main thread,
like the above code).
The correct solution here is to use asynchronous networking to
download the data and once you finish the download you can create a
UIImage from the gathered data. Using synchronous networking (like
you are above) is generally discouraged.
--
David Duncan
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Re: iphone large image downloading
On 19 Aug 2010, at 13:48, SanthoshKumarGundu wrote:
Hi all,
I have modified my code to send asynchronous request using the below
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:
[NSURLRequest
requestWithURL:
[NSURL
URLWithString:strURL]] delegate:self];
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[self.activeDownload appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// Set appIcon and clear temporary data/image
UIImage *image = [[UIImage alloc] initWithData:self.activeDownload];
if (image != nil)
{
self.appRecord.appIcon = image;
}
else
{
self.appRecord.appIcon = [UIImage
imageNamed:@image_not_available.png];
}
[image release];
// Release the connection now that it's finished
self.imageConnection = nil;
// call our delegate and tell it that our icon is ready for display
[delegate appImageDidLoad:self.indexPathInTableView];
[delegate appSingleImageDidLoad:rowNumber];
self.activeDownload = nil;
// show in the status bar that network activity is starting
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
In simulator I am able to run the application without any crashes.
But in device it is taking long time to download the first image, and from
second image the application is getting crashed.
I have seen crash reports , and it is of type low memory.
Can any one suggest me how to handle this situation?
Also, I have overridden didReceiveMemoryWarning and added an alertview,
it is not getting called.
Why did you do this? What do you think an alertview will achieve? Sounds like
you need to get to grips with memory usage better. Instruments is great for
that.
Thanks in advance.
Thanks,
Santhosh Kumar Gundu
On Aug 12, 2010, at 2:19 AM, David Duncan wrote:
On Aug 11, 2010, at 12:46 AM, SanthoshKumarGundu wrote:
Can any one have an idea of what is the maximum image limit(size and
resolution) in iphone?.
There are some images in web server. In my application , I am getting
these as NSData (one image at a time) and displaying the image using the
following code
NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL
URLWithString:imageURLString]];
UIImage *sampleImage = [UIImage imageWithData:imageData];
This is working fine for small images ( upto 1MB of size and resolution of
1024*1024).
But for large images ( 3MB size and resolution of 2500*2500), the
application is getting crashed.
What kind of crash are you getting? I would bet that the exception code is
0x8badf00d (see TN2151 for information on what that means and how to read
crash reports).
You are actually pretty lucky that the first version works at all, and I bet
that if you are on a slow or broken network that it won't work and you will
get a similar crash.
Generally any using -initWithContentsOfURL: for remote URLs will fail if you
are trying to do so on the main thread (and if you are using UIKit, you are
probably trying to do so on the main thread, like the above code).
The correct solution here is to use asynchronous networking to download the
data and once you finish the download you can create a UIImage from the
gathered data. Using synchronous networking (like you are above) is
generally discouraged.
--
David Duncan
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Re: iphone large image downloading
Write the image data to disk as it comes in instead of putting in a NSData, so
that you don't need to put it all in memory.
Use NSFileHandle:writeData.
On 2010-08-19, at 5:48 AM, SanthoshKumarGundu wrote:
Hi all,
I have modified my code to send asynchronous request using the below
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:
[NSURLRequest
requestWithURL:
[NSURL
URLWithString:strURL]] delegate:self];
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[self.activeDownload appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// Set appIcon and clear temporary data/image
UIImage *image = [[UIImage alloc] initWithData:self.activeDownload];
if (image != nil)
{
self.appRecord.appIcon = image;
}
else
{
self.appRecord.appIcon = [UIImage
imageNamed:@image_not_available.png];
}
[image release];
// Release the connection now that it's finished
self.imageConnection = nil;
// call our delegate and tell it that our icon is ready for display
[delegate appImageDidLoad:self.indexPathInTableView];
[delegate appSingleImageDidLoad:rowNumber];
self.activeDownload = nil;
// show in the status bar that network activity is starting
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
In simulator I am able to run the application without any crashes.
But in device it is taking long time to download the first image, and from
second image the application is getting crashed.
I have seen crash reports , and it is of type low memory.
Can any one suggest me how to handle this situation?
Also, I have overridden didReceiveMemoryWarning and added an alertview,
it is not getting called.
Thanks in advance.
Thanks,
Santhosh Kumar Gundu
On Aug 12, 2010, at 2:19 AM, David Duncan wrote:
On Aug 11, 2010, at 12:46 AM, SanthoshKumarGundu wrote:
Can any one have an idea of what is the maximum image limit(size and
resolution) in iphone?.
There are some images in web server. In my application , I am getting
these as NSData (one image at a time) and displaying the image using the
following code
NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL
URLWithString:imageURLString]];
UIImage *sampleImage = [UIImage imageWithData:imageData];
This is working fine for small images ( upto 1MB of size and resolution of
1024*1024).
But for large images ( 3MB size and resolution of 2500*2500), the
application is getting crashed.
What kind of crash are you getting? I would bet that the exception code is
0x8badf00d (see TN2151 for information on what that means and how to read
crash reports).
You are actually pretty lucky that the first version works at all, and I bet
that if you are on a slow or broken network that it won't work and you will
get a similar crash.
Generally any using -initWithContentsOfURL: for remote URLs will fail if you
are trying to do so on the main thread (and if you are using UIKit, you are
probably trying to do so on the main thread, like the above code).
The correct solution here is to use asynchronous networking to download the
data and once you finish the download you can create a UIImage from the
gathered data. Using synchronous networking (like you are above) is
generally discouraged.
--
David Duncan
___
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Re: iphone large image downloading
On Aug 11, 2010, at 12:46 AM, SanthoshKumarGundu wrote: Can any one have an idea of what is the maximum image limit(size and resolution) in iphone?. There are some images in web server. In my application , I am getting these as NSData (one image at a time) and displaying the image using the following code NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:imageURLString]]; UIImage *sampleImage = [UIImage imageWithData:imageData]; This is working fine for small images ( upto 1MB of size and resolution of 1024*1024). But for large images ( 3MB size and resolution of 2500*2500), the application is getting crashed. What kind of crash are you getting? I would bet that the exception code is 0x8badf00d (see TN2151 for information on what that means and how to read crash reports). You are actually pretty lucky that the first version works at all, and I bet that if you are on a slow or broken network that it won't work and you will get a similar crash. Generally any using -initWithContentsOfURL: for remote URLs will fail if you are trying to do so on the main thread (and if you are using UIKit, you are probably trying to do so on the main thread, like the above code). The correct solution here is to use asynchronous networking to download the data and once you finish the download you can create a UIImage from the gathered data. Using synchronous networking (like you are above) is generally discouraged. -- David Duncan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: iphone large image downloading
The UIImage class docs indicate you shouldn't create images larger than 1024 x 1024. You will either need to make sure your server will never send down an image larger than that, or download the image and downsample it to a reasonable size. Dave On Aug 11, 2010, at 12:46 AM, SanthoshKumarGundu wrote: Hi, Can any one have an idea of what is the maximum image limit(size and resolution) in iphone?. There are some images in web server. In my application , I am getting these as NSData (one image at a time) and displaying the image using the following code NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:imageURLString]]; UIImage *sampleImage = [UIImage imageWithData:imageData]; This is working fine for small images ( upto 1MB of size and resolution of 1024*1024). But for large images ( 3MB size and resolution of 2500*2500), the application is getting crashed. Can any one advise me on this. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: iphone large image downloading
On Aug 11, 2010, at 3:31 PM, Dave Camp wrote: The UIImage class docs indicate you shouldn't create images larger than 1024 x 1024. You will either need to make sure your server will never send down an image larger than that, or download the image and downsample it to a reasonable size. This particular language has been relaxed somewhat. As of iOS 3, creating and using images larger than 1024 in either dimension should work, as long as you have the memory for it. Of course, a 2.5K square image consumes about 24MB when decompressed. That should generally work on devices that have more built in memory, but is almost certain to fail on older devices that do not. But 24MB is still a huge amount of memory to consume on a single image that the user can't even see all at once. -- David Duncan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
