Creating file in Library directory on iphone - iphone

Question

I'm trying to create files in subdirectory inside my app Library dir. First at all I'm getting path to Library like this:
- (NSURL*) getLibraryDirectory
{
NSFileManager* manager = [NSFileManager defaultManager];
NSArray* paths = [manager URLsForDirectory:NSLibraryDirectory inDomains:NSUserDomainMask];
if ([paths count] > 0)
{
return [paths objectAtIndex:0];
}
return nil;
}
Then I create subfolder using this code:
- (NSURL*) getDirectory:(NSString*)subdirName
{
NSFileManager* sharedFM = [NSFileManager defaultManager];
NSURL* libraryDirectory = [self getLibraryDirectory];
if (libraryDirectory)
{
NSURL* subdir = [libraryDirectory URLByAppendingPathComponent:subdirName isDirectory:YES];
if (![sharedFM fileExistsAtPath:[subdir absoluteString] isDirectory:YES])
{
NSError* error;
if ([sharedFM createDirectoryAtURL:subdir withIntermediateDirectories:YES attributes:nil error:&error])
{
return subdir;
}
else
{
NSLog(#"Error occured while trying to create subdirectory \"%#\". Code - %d, desc - %#", subdirName, [error code], [error localizedDescription]);
}
}
}
return nil;
}
and last thing I'm trying to create some file in this folder like this:
NSString* filePath = [[self getDirectory:DIR_COMMANDS] absoluteString];
if (filePath)
{
filePath = [filePath stringByAppendingPathComponent:#"test_file.tst"];
NSFileManager* manager = [NSFileManager defaultManager];
if ([manager createFileAtPath:filePath contents:[[NSData alloc] initWithBytes:[[#"string" dataUsingEncoding:NSUTF16LittleEndianStringEncoding] bytes] length:12] attributes:nil])
{
NSLog(#"YES");
}
else
{
NSLog(#"NO");
}
}
But unfortunately I'm getting "NO" every time and can't understand why.

Answer 1

To get a path from a file URL you have to use path instead of absoluteString.
NSString *filePath = [[self getDirectory:DIR_COMMANDS] path];
Side note: You should adopt Cocoa's naming style for methods: libraryDirectory instead of getLibraryDirectory, or even better: libraryDirectoryURL. The get prefix is only used if return values are passed by reference.
Also: Your usage of fileExistsAtPath:isDirectory: is incorrect. The BOOL parameter is passed by reference:
BOOL isDir;
if ([sharedFM fileExistsAtPath:[subdir path] isDirectory:&isDir]) {
if (! isDir) {
NSLog(#"There's a plain file at my path");
return nil;
}
}