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Possible Duplicate:
Storing and retrieving unsigned long long value to/from NSString
尝试将 NSString 转换为 unsigned long long 时遇到问题。继承人的代码:
NSString* mp3id = [[NSString alloc] initWithUTF8String:"16902439379132728577"];
NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
NSNumber* persistentId = [f numberFromString:mp3id];
unsigned long long test = [persistentId unsignedLongLongValue];
NSLog(@"unsigned long long is %llu",test);
[f release];
输出:
2011-07-09 15:28:06.834 NBUnityMP3Plugin[443:307] unsigned long long 是 16902439379132729344 2011-07-09 15:28:06.847 NBUnityMP3Plugin[443:307] 持久性 ID 为 1.690243937913273e+19
为了更清楚:
16902439379132728577 - input
16902439379132729344 - output
理想情况下，我希望将那个 unsigned long long 放入一个 NSNumber 变量中。我认为如果我只有一个 unsigned long long，那会很容易。