getResourceValue :forKey:error:
Returns the resource value for the property identified by a given key.
Parameters of [NSURL getResourceValue]
- value
- The value for the property identified by key.
- key
- The name of one of the URL’s resource properties.
- error
- The error that occurred in the case that the resource value cannot be retrieved.
Return Value
YES if value is successfully populated; otherwise, NO.Discussion of [NSURL getResourceValue]
value is set to
nil if the requested resource value is not defined for the URL. In this case, the method still returns YES.
Example of [NSURL getResourceValue] - 1
NSURL *samplePath = [[NSURL alloc initWithString:@"file://localhost/Users/Abhinav/Test/abhi.pdf"];
NSNumber *fileSizeBytes;
[samplePath getResourceValue:&fileSizeBytes forKey:NSURLFileSizeKey error:&error];
NSLog(@"Error===%@",error); NSLog(@"size of file in bytes ===%@",fileSizeBytes);
Example of [NSURL getResourceValue] - 2
if (![url getResourceValue:&name forKey:NSURLNameKey error:&error])
{
NSLog(@"name: %@", [error localizedDescription]);error = nil;
}
Example of [NSURL getResourceValue] - 3
NSFileManager *fileManager = [[[NSFileManager alloc] init] autorelease];
NSURL *directoryURL = … // URL pointing to the directory you want to browse
NSArray *keys = [NSArray arrayWithObject:NSURLIsDirectoryKey];
NSDirectoryEnumerator *enumerator = [fileManager
enumeratorAtURL:directoryURL
includingPropertiesForKeys:keys
options:0
errorHandler:^(NSURL *url, NSError *error) {
// Handle the error.
// Return YES if the enumeration should continue after the error.
return YES;
}];
for (NSURL *url in enumerator) {
NSError *error;
NSNumber *isDirectory = nil;
if (! [url getResourceValue:&isDirectory forKey:NSURLIsDirectoryKey error:&error]) {
// handle error
}
else if (! [isDirectory boolValue]) {
// No error and it’s not a directory; do something with the file
}
}
