小编Rob*_*erk的帖子

如何构建mySQL查询以根据最大值删除行.

我试过了

WHERE jobPositonId = max(jobPostionId)

但是有错误？

我在堆栈跟踪中获取了以下消息.我可以找到蓝牙设备,但当我尝试打开套接字时会发生这种情况.

10-30 22:23:08.901: ERROR/BTL_CFG(8633): WARNING : [service.brcm.bt.INQ_FILTER_BDA] property_get failed (0)
10-30 22:23:24.585: ERROR/BTLD(8633): ****************search UUID = 1454***********
10-30 22:23:24.600: ERROR/BluetoothEventLoop.cpp(2502): onCreateDeviceResult: D-Bus error: org.bluez.Error.AlreadyExists (Device already exists)
10-30 22:23:24.616: ERROR/DTUN_HCID4(8659): No device pointer found for peer! Ignore Error = true. Ignoring error...
10-30 22:23:26.093: ERROR/DTUN_HCID4(8659): discovery unsuccessful!
10-30 22:23:30.628: ERROR/CachedBluetoothDevice(18609): onUuidChanged: Time since last connect 1440232. mInitiatedPairing: false
10-30 22:23:30.632: ERROR/CachedBluetoothDevice(18609): onUuidChanged: Time since last connect1440236.mInitiatedPairing:false

编辑:

套接字尝试打开但不会,抛出异常(Service Discovery failed)然后正确关闭套接字.

我有一个创建UDP对象的Form,在UDP类中创建UDPClient,并使用EndReceive在BeginReceive方法中完成接收的数据.

当我打印所提供数据的字符串后,在转换byte []之后,从beginreceive方法中添加文本,只有接收的数据不打印附加的文本.

所以看起来收到的数据不完整.

打印字符串时,不显示NewLine和附加的"done".

任何帮助都会很棒!!

谢谢

class Udp
{
    public EventHandler _dataReceived;

    public Udp()
    {

        int receiverPort = 1248;
        UdpClient receiver = new UdpClient(receiverPort);

        string discovery = "<?xml version=\"1.0\"?><ServiceQuery></ServiceQuery>";

        receiver.BeginReceive(new AsyncCallback( DataReceived), receiver);

        IPEndPoint end = new IPEndPoint(IPAddress.Broadcast, 1248);
        receiver.Send(Encoding.ASCII.GetBytes(discovery + "\0"), discovery.Length + 1, end);
}

private void DataReceived(IAsyncResult ar)
{
    UdpClient c = (UdpClient)ar.AsyncState;
    IPEndPoint receivedIpEndPoint = new IPEndPoint(IPAddress.Any, 1248);

    Byte[] receivedBytes = c.EndReceive(ar, ref receivedIpEndPoint);

    string receivedText = ASCIIEncoding.ASCII.GetString(receivedBytes);

    Console.WriteLine("\n");

    if(_dataReceived != null)
    {
        Console.Write(receivedIpEndPoint + …

如何在PHP中设置textarea对象的文本,是否有必要使用javascript.

我想要一个textarea,并能够设置在不同时间显示的文本.

谢谢

我一直在做一些阅读,并有点困惑.在Android开发中,屏幕和活动之间有区别吗？这些是什么？我正在阅读有关具有多个屏幕的活动.