Install-Package InTheHand.Net.Personal

using InTheHand.Net;
using InTheHand.Net.Sockets;
using InTheHand.Net.Bluetooth;

private BluetoothClient btClient;
private NetworkStream btStream;
private BluetoothDeviceInfo selectedDevice;
private readonly Guid serviceUUID = new Guid("00001132-0000-1000-8000-00805f9b34fb"); // 標(biāo)準(zhǔn) SPP 服務(wù) UUID

private void btnScan_Click(object sender, EventArgs e)
{
    lstDevices.Items.Clear();
    btClient = new BluetoothClient();
    var devices = btClient.DiscoverDevices(); // 最多可發(fā)現(xiàn) 255 臺設(shè)備

    foreach (var device in devices)
    {
        lstDevices.Items.Add($"{device.DeviceName} [{device.DeviceAddress}]");
    }
}

private void lstDevices_SelectedIndexChanged(object sender, EventArgs e)
{
    var devices = btClient.DiscoverDevices();
    selectedDevice = devices[lstDevices.SelectedIndex];
    richTextBox1.AppendText($"已選擇：{selectedDevice.DeviceName}\n");
}

private void btnConnect_Click(object sender, EventArgs e)
{
    try
    {
        btClient.Connect(selectedDevice.DeviceAddress, serviceUUID);
        btStream = btClient.GetStream();
        StartListening();
        richTextBox1.AppendText("連接成功\n");
    }
    catch (Exception ex)
    {
        MessageBox.Show($"連接失敗：{ex.Message}");
    }
}

private void StartListening()
{
    new Thread(() =>
    {
        byte[] buffer = new byte[1024];
        while (btClient?.Connected == true)
        {
            try
            {
                int bytesRead = btStream.Read(buffer, 0, buffer.Length);
                if (bytesRead > 0)
                {
                    string received = Encoding.UTF8.GetString(buffer, 0, bytesRead);
                    Invoke((MethodInvoker)delegate { richTextBox1.AppendText($"[接收] {received}\n"); });
                }
            }
            catch { break; }
        }
    }).Start();
}

private void btnSend_Click(object sender, EventArgs e)
{
    if (btClient?.Connected != true) return;

    byte[] buffer = new byte[1024]; // 緩沖區(qū)大小可以根據(jù)需要調(diào)整
    using (FileStream fs = new FileStream(txtSend.Text, FileMode.Open, FileAccess.Read))
    {
        int bytesRead;
        while ((bytesRead = fs.Read(buffer, 0, buffer.Length)) > 0)
        {
            btClient.GetStream().Write(buffer, 0, bytesRead); // 分塊發(fā)送
        }
    }

    richTextBox1.AppendText($"[發(fā)送] {txtSend.Text}\n");
    txtSend.Clear();
}

00001132-0000-1000-8000-00805f9b34fb