The easiest way to write NSData to a file

Question

NSData *data;
data = [self fillInSomeStrangeBytes];

My question is now how I can write this data on the easiest way to an file.

Answer 1

You also have writeToFile:options:error: or writeToURL:options:error: which can report error codes in case the saving of the NSData failed for any reason. For example:

NSError *error;

NSURL *folder = [[NSFileManager defaultManager] URLForDirectory:NSApplicationSupportDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:true error:&error];
if (!folder) {
    NSLog(@"%s: %@", __FUNCTION__, error);        // handle error however you would like
    return;
}

NSURL *fileURL = [folder URLByAppendingPathComponent:filename];
BOOL success = [data writeToURL:fileURL options:NSDataWritingAtomic error:&error];
if (!success) {
    NSLog(@"%s: %@", __FUNCTION__, error);        // handle error however you would like
    return;
}