Question

Ok这是问题所在。我试图通过苹果蓝牙发送网络数据包代码通过结构或任何东西发送。要发送的代码在

之下

-(void)sendMessagePacket:(GKSession *)session packetID:(int)packetID withData:(void *)data ofLength:(int)length reliable:(BOOL)howtosend {

static unsigned char networkPacket[maxPacketSize];
const unsigned int packetHeaderSize = 2 * sizeof(int); // we have two "ints" for our header

if(length < (maxPacketSize - packetHeaderSize)) { // our networkPacket buffer size minus the size of the header info
    int *pIntData = (int *)&networkPacket[0];
    // header info
    pIntData[0] = 10;
    pIntData[1] = packetID;

    // copy data in after the header
    memcpy( &networkPacket[packetHeaderSize], data, length ); 

    NSData *packet = [NSData dataWithBytes: networkPacket length: (length+8)];

    if(howtosend == YES) { 
        [session sendDataToAllPeers:packet withDataMode:GKSendDataReliable error:nil];
    } else {
        [session sendDataToAllPeers:packet withDataMode:GKSendDataUnreliable error:nil];
    }
}

}

如果有人可以用梳子来解决这个问题并解释发生了什么，那将非常感激。接下来是接收代码。

- (void)receiveData:(NSData *)data fromPeer:(NSString *)peer inSession: (GKSession *)session context:(void *)context {
// Caller whenever data is received from the session
unsigned char *incomingPacket = (unsigned char *)[data bytes];  

//EXPECTS THAT WHAT IS IN INCOMING PACKET [0] TO BE OF DATA TYPE INTEGER
int *pIntData = (int *)&incomingPacket[0];

int packetTime = pIntData[0];

int packetID = pIntData[1];

static int lastPacketTime = -1;

    switch (packetID) {
    case NETWORK_COINTOSS:
        //DO SOMETHING
        break;

        case NETWORK_TEXT_EVENT:

            NSString *fewMore = (NSString *)&incomingPacket[8];

             fewThings *bitMore = &fewMore[peer];

            //NSLog(@"Trace Bit More: %@",fewMore);
            break;
    default:
        break;
}


NSInteger lengthBytes = [data length];
NSLog(@"Length of data : %i", lengthBytes);

}

我正在努力使其成为目标c的新成员是这一切是如何工作的，我如何访问我发送的字符串，因为所有记录它的努力都会导致程序崩溃。

以下是用于开始发送的代码：

    NSString *bigWord = @"BigWordBigWord";
NSInteger len = [bigWord length];
[self sendMessagePacket:gameSession  packetID:NETWORK_TEXT_EVENT withData:bigWord ofLength:(len) reliable:YES];

任何帮助都会非常感激。谢谢。

Answer 1

您确实需要将NSString对象更改为要发送的UTF8表示形式，或将其存档为您使用全长发送的NSData对象 - 您不能只将NSString转换为C字符串（用于发送）或接收!!!）。

您可以使用以下命令获取NSString的C字符串版本：

const char * sendString = [bigWord cStringUsingEncoding：NSUTF8StringEncoding]

然后使用

将其从传入的NSData对象中删除

NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

Answer 2

这家伙正在通过网络发送和接收字符串就好了。但是，我在接收端仍然会收到错误。

http://discussions.apple.com/thread.jspa?messageID=10215848

终于明白了。 GKTank使用struct传输数据，所以我将我的字符串放在struct中，rest是历史记录。

typedef struct {
    NSString *strInfo;
} myInfo;

现在已经诅咒数据包36个小时了，请帮忙！

2 个答案: