NSMutableData Save to a File - iphone

Question

I downloaed the file using code shown below. Then i am trying to save NSMutableData variable to file, however, the file is not created. What am i doing wrong? Do i need to convert NSMutableData into NSString?
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)_response {
response = [_response retain];
if([response expectedContentLength] < 1) {
data = [[NSMutableData alloc] init];
}
else {
data = [[NSMutableData dataWithCapacity:[response expectedContentLength]] retain];
}
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)_data {
[data appendData:_data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"file" ofType:#"txt"];
NSLog(#"saved: %#", filePath);
[data writeToFile:filePath atomically:YES];
NSLog(#"downloaded file: %#", data); //all i see in log is some encoded data here
}

Answer 1

You can’t write inside your app’s bundle. You’ll need to save it somewhere else, like your app’s Documents directory:
NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *filePath = [documentsPath stringByAppendingPathComponent:#"file.txt"];
[data writeToFile:filePath atomically:YES];