iphone - 结构到 NSData 到结构？

Question

我有以下结构:

typedef enum
{
    kPacketTypeJoin = 1,
    kPacketTypeServerAcceptedJoin,
    kPacketTypeSelectedNumber,
} PacketTypes;    
typedef struct
{
    PacketTypes type;
    NSString *name;
} PacketJoin;

我如何将 PacketJoin 转换为 NSData 并再次返回到 PacketJoin？

Answer 1

// make a NSData object
NSData *myData = [NSData dataWithBytes:&myPacketJoin length:sizeof(myPacketJoin)];

// make a new PacketJoin
PacketJoin newJoin;
[myData getBytes:&newJoin length:sizeof(newJoin)];