Downloading a file from url and saving to resources on iPhone

Question

Is it possible to download a file (i.e. an sqlite database file) from the Internet into your iPhone application problematically for later use within the application?

I am trying using NSURlConnection, but not able to save the file.

Here is the example code I am trying:

- (void)viewDidLoad {
    [super viewDidLoad];

        NSString *file = [NSString stringWithFormat:@"http://en.wikipedia.org/wiki/Text_file"];
        NSURL *fileURL = [NSURL URLWithString:file];

        NSURLRequest *req = [NSURLRequest requestWithURL:fileURL];
        NSURLConnection *conn = [NSURLConnection connectionWithRequest:req delegate:self];




}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
        [self.fileData setLength:0];
        self.totalFileSize = [NSNumber numberWithLongLong:[response expectedContentLength]];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
        [self.fileData appendData:data];        
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {



    NSArray *dirArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,    NSUserDomainMask, YES);
    NSLog(@"%@", [dirArray objectAtIndex:0]);

    NSString *path = [NSString stringWithFormat:@"%@/blah.text", [dirArray objectAtIndex:0]];
    if ([self.fileData writeToFile:path options:NSAtomicWrite error:nil] == NO) {
        NSLog(@"writeToFile error");

    }
else {

    NSLog(@"Written!");
}

    }

Answer 1

What is fileData? How is it defined and initialized?

  fileData = [NSMutableData data];

should be somewhere after:

NSURLConnection *conn = [NSURLConnection connectionWithRequest:req delegate:self];

You have to initialize fileData and retain it per memory management rules.

Try it with my answer. It Works!

Answer 2

You need to expand the path with stringByAppendingPathComponent

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"bookdb.sql"];