Question

I have code that will check to see if an image is on the phone or not (the name being retrieved from the db), and if not, it runs this code:

NSString *urlString = [NSString stringWithFormat: @"http://www.vegashipster.com/%@",image_path];                        
NSData *imageData = [[NSData alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]]];

NSLog(@"saving jpg");
UIImage *image = [[UIImage alloc] initWithData:imageData];//1.0f = 100% quality

[UIImageJPEGRepresentation(image, 1.0f) writeToFile:myFilePath atomically:YES];
NSLog(@"saving image done");
NSLog(@"URL String: %@",urlString);
NSLog(@"http://www.vegashipster.com/%@",image_path);

rest_image = [UIImage imageNamed:image_path];

[image release];
[imageData release];

This code works just fine on the simulator, but on the iPhone, the screen freezes for a few seconds (downloading the image, I think), then loads the page, but with no image visible. The next time you hit that page, there is no freeze. So I believe the file is being created, but it’s a messed up image file, and therefore not displayed.

I’ve already broken this code up so that it runs in it’s own thread, and again, it works in the simulator. I had thought that if it ran behind the scenes, there would be less of a chance that the image data would get messed up, but the exact same thing happens (minus the freezing). Does anyone know what I am doing wrong with this code? Thanks for any and all help/comments.

Edit

And yes, the images being downloaded are strictly .jpg

Edit 2

I seen:

Make sure you are writing to your DOCUMENTS directory, which you have read+write access to. Otherwise you won’t get any files.

at http://www.iphonedevsdk.com/forum/iphone-sdk-development/15628-file-weirdness-files-written-disk-do-not-appear-nsfilemanager-defaultmanager.html . Could this be my issue?

NSString *image_path = [[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 5)] stringByReplacingOccurrencesOfString:@"../"
NSString *myFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:image_path];

Last Edit

Well, I found what I believe to be my answer at How can I get a writable path on the iPhone? . It pretty much states I cannot save image files where my own image files are located inside the build. If this is incorrect, please let me know and I will try your way.

Answer 1

Sorry, forgot about this thread completely. I did end up fixing this issue. Here is what I did:

NSFileManager* fileManager = [NSFileManager defaultManager];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libraryDirectory = [paths objectAtIndex:0];

NSString *myFilePath = [libraryDirectory stringByAppendingPathComponent:image_path];

BOOL fileExists = [fileManager fileExistsAtPath:myFilePath];

if (fileExists){
    hotel_image = [UIImage imageWithContentsOfFile:myFilePath];
}else{
    [NSThread detachNewThreadSelector:@selector(downloadImage:) toTarget:[HotelsDetailsViewController class] withObject:image_path];

    fileExists = [fileManager fileExistsAtPath:myFilePath];

    if (fileExists){
        hotel_image = [UIImage imageWithContentsOfFile:myFilePath];
    }else{
        hotel_image = [UIImage imageNamed:@"hdrHotels.jpg"];
    }
}

In short, I found my app’s library directory and saved there.