NSData *myData = [NSData dataWithBytes:&aStruct length:sizeof(aStruct)];
OneStruct oneStruct;
[myData getBytes:&oneStruct length:sizeof(oneStruct)];
NSData *myData = [NSData dataWithBytes:&aStruct length:sizeof(aStruct)];
OneStruct oneStruct;
[myData getBytes:&oneStruct length:sizeof(oneStruct)];