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我正在尝试通过 iPhone 中的 Peer to Peer Networking 发送一些文本。我稍微修改了 GKTank Sample 以使其发送字符串而不是自定义结构数据。以下是我编写的代码。我的问题是我可以将@"hello" 发送到另一个 ios 设备并且它可以接收数据（长度为 5），但是它接收到的 NSData 无法转换为 NSString，因此接收到的数据无法显示为字符串。关于代码有什么问题的任何想法？

- (void)receiveData:(NSData *)data fromPeer:(NSString *)peer inSession:(GKSession *)session context:(void *)context 
{
    NSString *recvStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    textField.text = recvStr;
    [recvStr release];
}

- (void)sendNetworkPacket:(GKSession *)session packetID:(int)packetID withData:(void *)data ofLength:(int)length reliable:(BOOL)howtosend
{
    NSData *packet = [NSData dataWithBytes:data length:length];
    NSError *error = nil;
    if(howtosend == YES) { 
        [session sendData:packet toPeers:[NSArray arrayWithObject:gamePeerId] withDataMode:GKSendDataReliable error:&error];
    } else {
        [session sendData:packet toPeers:[NSArray arrayWithObject:gamePeerId] withDataMode:GKSendDataUnreliable error:&error];
    }
    if (!error) {
        NSLog(@"Did send data");
    } else {
        NSLog(@"Send data failed: %@", [error localizedDescription]);
    }

}

- (IBAction)sendText:(id)sender
{
    if (self.gameSession && textField.text.length) {
        NSData *data = [textField.text dataUsingEncoding:NSUTF8StringEncoding];
        [self sendNetworkPacket:gameSession packetID:0 withData:data ofLength:[data length] reliable:NO];
    }
}
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1 回答 1

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该问题通过将 NSData* 类型转换为 char* 并用于-stringWithCString:encoding:从 CString 获取 NSString 来解决。

- (void)receiveData:(NSData *)data fromPeer:(NSString *)peer inSession:(GKSession *)session context:(void *)context
{
    unsigned char *incomingPacket = (unsigned char *)[data bytes];
    textField.text = [NSString stringWithCString:(const char *)incomingPacket encoding:NSUTF8StringEncoding];
}
于 2011-03-10T09:44:04.320 回答