将 NSString 转换为 Unsigned long

Question

I am having NSString value which I want to convert in unsigned long . I used code below

NSString *updateId = [NSString stringWithFormat:@"%@",[tweet updateId]];

NSLog(@"%@",[tweet updateId]);
unsigned long  tweetId = [updateId longLongValue];
NSLog(@"ButtonPressed: .......%llu",tweetId);

But it is not returning correct value...

Answer 1

The Cocoa way would be to use [NSNumberFormater] 1 :

NSNumberFormatter* formatter = [[NSNumberFormatter alloc] init];
NSLog(@"%lu", [[formatter numberFromString:updateId] unsignedLongValue]);
[formatter release];

What's the the type of [tweet updateId]?
Does it contain any localization (eg thousand separators)?
If so, you could configure the NSNumberFormatter instance with setLocale:

Answer 2

unsigned long tweetId = [[NSNumber numberWithInteger:[updateId integerValue]] unsignedLongValue];

Answer 3

You may try the atol function from the C stdlib:

unsigned long tweetId = atol( [ updateId cStringUsingEncoding: NSASCIIStringEncoding ] );

And by the way, your NSLog should be lu , not llu .