我正在尝试将阵列从一个玩家发送到另一个玩家。

我在标题中创建一个结构

typedef struct {
    Message message;
    unsigned int numBytes;
    void * bytes;
} MessagePingBackToCaller;

typedef struct {
    MessageType messageType;
} Message;


并尝试发送与此:

-(void)sendOpponentRadar{

    MessagePingBackToCaller sendMessage;
    sendMessage.message.messageType = kMessageTypeRecievedRadarPing;
    NSData *pingData = [NSKeyedArchiver archivedDataWithRootObject:[cover gatherAndReturnColumnNumbers]];

    sendMessage.bytes = pingData;

    NSData *data = [NSData dataWithBytes:&sendMessage length:sizeof(MessagePingBackToCaller)];
    [self sendData:data];
}


并收到此:

if (message->messageType == kMessageTypeRecievedRadarPing){

        MessagePingBackToCaller *messageSent = (MessagePingBackToCaller *)[data bytes];

        NSLog(@"Data : %@", messageSent->bytes);

        NSMutableArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:messageSent->bytes];
        NSLog(@"Results : %@", array);
    }


但是没有运气,所以我四处张望,发现@rwenderlich写下了一些帮助:


将NSArray转换为NSData
在struct中,存储一个无符号的int numBytes和一个void *字节
以numBytes为单位,写出NSData的长度,然后写出NSData的内容
另一方面,读取numBytes以查看接下来要读取多少字节,然后读取该数量的字节并逆转该过程(bytes-> NSData-> NSArray)。


我在1和2上表现不错...我相信,但是我在3和4上迷路了。有人可以帮我将其翻译成有意义的代码吗?

谢谢!

最佳答案

您可以使用NSKeyedArchiver来完成技巧,不要使用c结构,使其成为Objective-C类,使用NSKeyedArchiver从事物中获取数据并发送该数据,然后在另一端取消存档,这是任意类的示例

接口

@interface GameState : NSObject
{
   //enum for session state
    SessionState _currentState;
    NSData *_data;
    NSString *_message;

    NSDate *_timestamp;

}

@property(nonatomic,retain) NSDate *timestamp;

@property(assign) SessionState currentState;
@property(nonatomic,retain) NSData *data;
@property(nonatomic,retain) NSString *message;
- (id)initWithCoder:(NSCoder *)coder;


实作

@implementation GameState
@synthesize message=_message ,  currentState= _currentState, data=_data;
@synthesize  timestamp=_timestamp;
- (id)init
{
    self = [super init];
    if (self) {
        // Initialization code here.
        _killPlayback=FALSE;
        _lastPacket=FALSE;
        _number=0.0;
        _pass=FALSE;
        _timestamp=NULL;

    }

    return self;
}
- (void)encodeWithCoder:(NSCoder *)coder
{
    [coder encodeObject:_timestamp forKey:@"Timestamp"];

    [coder encodeObject:_message forKey:@"Message"];
    [coder encodeObject:_data forKey:@"Data"];
    [coder encodeInt:_currentState forKey:@"State"];



}
// Decode an object from an archive
- (id)initWithCoder:(NSCoder *)coder
{
    self = [super init];
    _message  = [[coder decodeObjectForKey:@"Message"] retain];
    _data  = [[coder decodeObjectForKey:@"Data"] retain];
    _currentState=(SessionState)[coder decodeIntForKey:@"State"];
    _timestamp=[[coder decodeObjectForKey:@"Timestamp"] retain];
    return self;
}
@end


现在您可以从对象获取数据,例如

-(NSData*)dataFromObject:(id)obj
{
    return [NSKeyedArchiver archivedDataWithRootObject:obj];
}


和数据对象

-(id)objectFromData:(NSData*)data
{
    return [NSKeyedUnarchiver unarchiveObjectWithData:data];
}


然后您的工作流程就变成了
在发送方

GameState *state=..;
NSData* data=[self dataFromObject:state];
//send the data


在接收端

GameState *state=[self objectFromData:data];


希望能帮助到你

关于objective-c - 使用GameKit以字节为单位发送和接收NSMutableArray,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/9071435/

10-13 02:04
查看更多