读错误:ErrorDomain=NSPOSIXErrorDomain Code=2 "No such file or directory" UserInfo={_kCFStreamErrorCodeKey=2, _kCFStreamErrorDomainKey=1}
read:maxLength:
1 2
- (NSInteger)read:(uint8_t *)buffer maxLength:(NSUInteger)len; // reads up to length bytes into the supplied buffer, which must be at least of size len. Returns the actual number of bytes read.