ios - 如何将 NSData 转换为 C 字符串？

Question

如何将 [NSString dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES] 结果转换为 C 字符串？

Returns an NSData object containing a representation of the receiver encoded using a given encoding.

- (NSData *)dataUsingEncoding:(NSStringEncoding)encoding allowLossyConversion:(BOOL)flag

Note that the data returned by dataUsingEncoding:allowLossyConversion: is not a strict C-string since it does not have a NULL terminator.

Answer 1

NSMutableData *data = [[@"foo" dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES] mutableCopy];
char nul = '\0';
[data appendBytes:&nul length:sizeof(nul)];
const char *cString = [data bytes];

或者，简单地说:

const char *cString = [@"foo" UTF8String];

...结果完全一样。