Saturday, June 1, 2013

NSData NSDataReadingUncached example in Objective C (iOS).

NSData NSDataReadingUncached

Options for methods used to read NSData objects.

enum {
NSDataReadingMappedIfSafe = 1UL << 0,
NSDataReadingUncached = 1UL << 1,
NSDataReadingMappedAlways = 1UL << 3,
typedef NSUInteger NSDataReadingOptions;
A hint indicating the file should be mapped into virtual memory, if possible and safe.
A hint indicating the file should not be stored in the file-system caches.
For data being read once and discarded, this option can improve performance.
Hint to map the file in if possible.
This takes precedence over NSDataReadingMappedIfSafe if both are given.

NSData NSDataReadingUncached example.
NSError* error = nil;
NSData* data = [NSData dataWithContentsOfURL:yourURL options:NSDataReadingUncached error:&error];
if (error) {
    NSLog(@"%@", [error localizedDescription]);
    [error release];
} else {
    NSLog(@"Data has loaded successfully.");

Example of [NSData NSDataReadingUncached].
NSError *error = nil;
NSURL *url = [NSURL URLWithString:[imageLinks objectAtIndex:0]];
NSData *tdata = [NSData dataWithContentsOfURL:url options:NSDataReadingUncached error:&error];
if (error) {
    NSLog(@"%@", [error localizedDescription]);
}else {
    // no error, this one is being called within my app
    NSLog(@"Data loaded successfully");

NSData NSDataReadingUncached example.
NSError *err = nil;
NSData *data [NSData dataWithContentsOfFile:path
UIImage *img = [UIImage imageWithData:data];

End of NSData NSDataReadingUncached example article.