Question

我正在尝试连接打印机（通过MAC地址）并打印。我遇到了几个问题，我试图克服几个小时而没有成功。我尝试了几种不同的方法：

方法1：使用PeerFinder.AlternateIdentities [“Bluetooth：SDP”] =“{00001101-0000-1000-8000-00805F9B34FB}”首次尝试连接。当我尝试在关闭连接后重新打开连接时，它无法找到任何配对设备。当我退出应用程序并重新运行时，我得到以下异常：“找不到元素。（来自HRRESULT的异常：0x80070490）在socket.ConnectAsync（）

//Search for devices based on service
PeerFinder.AlternateIdentities["Bluetooth:SDP"] = "{00001101-0000-1000-8000-00805F9B34FB}";

//bluetooth device to connect to
var m_bluetoothDevice;

//paired bluetooth device list 
var m_pairedDevices = await PeerFinder.FindAllPeersAsync();

if (m_pairedDevices.Count > 0)
{
    foreach (PeerInformation device in m_pairedDevices)
    {
        //Find the device with matching bluetooth mac address (eg. "00:AA:BB:CC:DD:EE")
        String macAddr = device.HostName.RawName;
        if (macAddr.Contains(m_bluetoothAddress.ToUpper()))
        {
            m_bluetoothDevice = device;
            break;
        }
    }
}

//Device not paired
if (m_bluetoothDevice == null)
    throw new Exception("Device was not paired with system.");

StreamSocket socket = new StreamSocket();
if (socket != null)
{
    //Connect to device. Run this task synchronously
    IAsyncAction taskConnect = socket.ConnectAsync(m_bluetoothDevice.HostName, m_bluetoothDevice.ServiceName);
    taskConnect.AsTask().Wait();
    if (taskConnect.ErrorCode != null)
    {
        throw (taskConnect.ErrorCode);
    }
}

方法2：使用PeerFinder.Alternative [“蓝牙：已配对”=“”，我能够连接一次。关闭连接并重新打开连接后，我在socket.ConnectAsync（）中收到以下异常“找不到元素。（HRRESULT异常：0x80070490）。

//Search for devices based on service
PeerFinder.AlternateIdentities["Bluetooth:Paired"] = "";

//bluetooth device to connect to
var m_bluetoothDevice;

//paired bluetooth device list 
var m_pairedDevices = await PeerFinder.FindAllPeersAsync();

if (m_pairedDevices.Count > 0)
{
    foreach (PeerInformation device in m_pairedDevices)
    {
        //Find the device with matching bluetooth mac address (eg. "00:AA:BB:CC:DD:EE")
        String macAddr = device.HostName.RawName;
        if (macAddr.Contains(m_bluetoothAddress.ToUpper()))
        {
            m_bluetoothDevice = device;
            break;
        }
    }
}

//Device not paired
if (m_bluetoothDevice == null)
    throw new Exception("Device was not paired with system.");

StreamSocket socket = new StreamSocket();
if (socket != null)
{
    //Connect to device. Run this task synchronously
    IAsyncAction taskConnect = socket.ConnectAsync(m_bluetoothDevice.HostName, "{00001101-0000-1000-8000-00805F9B34FB}");
    taskConnect.AsTask().Wait();
    if (taskConnect.ErrorCode != null)
    {
        throw (taskConnect.ErrorCode);
    }
}

遇到同样问题的人？我做错了什么？

提前致谢

FindAllPeersAsync（）和StreamSocket.ConnectAsync（）问题

0 个答案: