在两个设备之间发送时数据会被弄乱

Question

我构建了一个多人游戏，它在我的 iPhone 5s 上与模拟器玩得很好。但是每当我尝试从 5s 对抗 iPhone 5 时，都会出现一些问题。

游戏向其他玩家发送两个值：得分和等级。

如果 iPhone 5s 发送值：iPhone 5 认为 score = 0 并且 level = 我们作为分数发送的值。

typedef struct {
    NSUInteger score;
    NSUInteger level;
} MessageNewScore;

- (void)sendData:(NSData *)data {
    NSError *error;
    GameKitHelper *gameKitHelper = [GameKitHelper sharedGameKitHelper];

    BOOL success = [gameKitHelper.match sendDataToAllPlayers:data withDataMode:GKMatchSendDataReliable error:&error];
    if (!success) {
        NSLog(@"Error sending data:%@", error.localizedDescription);
    }
}

// Run on iPhone 5s
- (void)sendNewScore:(NSUInteger)score level:(NSUInteger)level{
    NSLog(@"score: %lu", (unsigned long)score); // E.g. 1930
    NSLog(@"level: %lu", (unsigned long)level); // E.g. 7

    MessageNewScore messageNewScore;
    messageNewScore.message.messageType = kMessageTypeNewScore;
    messageNewScore.score = score;
    messageNewScore.level = level;
    NSData *data = [NSData dataWithBytes:&messageNewScore
                              length:sizeof(MessageNewScore)];

    [self sendData:data];

    NSLog(@"score: %lu", (unsigned long)messageNewScore.score); // 1930
    NSLog(@"level: %lu", (unsigned long)messageNewScore.level); // 7
}

// Run on iPhone 5
- (void)match:(GKMatch *)match didReceiveData:(NSData *)data fromPlayer:(NSString *)playerID {
    MessageNewScore *messageNewScore = (MessageNewScore*)[data bytes];

    NSLog(@"score: %lu", (unsigned long)messageNewScore->score); // According to iPhone 5 this is 0
    NSLog(@"level: %lu", (unsigned long)messageNewScore->level); // According to iPhone 5 this is 1930

    [_delegate enemysScoreReceived:messageNewScore->score level:messageNewScore->level];
}

在最后一种情况下，sendNewScore:: 中登录的值是正确的，而 didReceiveData:: 中的值是错误的。我认为这可能与 5s 中的 64 位处理器有关，但不确定如何解决此问题。

Answer 1

iPhone 5 使用 Apple A6（32 位）处理器，iPhone 5S 使用 Apple A7（64 位）处理器。

你需要 encode/decode NSData 在玩家之间传送的便携表示，比如可以通过 NSKeyedArchiver/NSKeyedUnarchiver 获得 encoding/decoding NSIntegers 等。您当前正在发送 structs，其表示是特定于处理器的。

在两个设备之间发送时数据会被弄乱

Data gets messed up when sent between two devices

ios

objective-c

game-center

gamekit