public MainWindow()
{
_messageBytes = Array.Empty <byte>();
this.SelectedCOMPort = new("");
InitializeComponent();
RefreshCOMPorts(autoSetWhenUniquePort: true);
cmdButtons = new[]
{ btn_clear, btn_ResetToBLE, btn_resetToUART, btn_setTime, btn_startRecording, btn_stopToUART, btn_viewAll,
btn_Say012 };
txtblk.Text = "";
//suppress button toggle when erase in progress message received
AcksThatSuppressButtonToggling.Add(ConcatToSingleIEnumearble(ackErase_Prefix, ackErase_InProgress_Payload, Suffix));
AcksThatSuppressButtonToggling.Add(ConcatToSingleIEnumearble(ackSay012_Whole));
}
private async void Connect_Button_Click(object sender, RoutedEventArgs e)
{
SelectedCOMPort = COMSelector?.SelectedItem?.ToString() ?? "";
if (SelectedCOMPort == "")
{
return;
}
btn_Connect.IsEnabled = false;
toggleCommandButtons(false);
// Connected and try to disconnect
bool isConnectionSuccess = Connection != null && Connection.IsConnected;
if (isConnectionSuccess)
{
Connection?.Dispose();
COMSelector !.IsEnabled = true;
this.RefreshCOMPorts();
btn_Connect.Content = "Connect";
return;
}
// Not connected
else
{
if (this.SelectedCOMPort == "")
{
MessageBox.Show(ConnectionEmpty + ", please choose one.");
return;
}
try
{
Connection?.Dispose();
Connection = new(SelectedCOMPort);
// Should I use local function instead of delegate? Will it break my code?
//SerialDataReceivedEventHandler handler = delegate
void handler(object sender, SerialDataReceivedEventArgs e)
{
int messageLength = Connection !.CurrentPort.BytesToRead;
this._messageBytes = new byte[messageLength];
Connection !.CurrentPort.Read(this._messageBytes, 0, messageLength);
string s = BitConverter.ToString(this._messageBytes, 0, messageLength);
// Must use begin invoke bacause Event handler is not called in Main thread
// Or InvalidOperationException will be thrown
// Cannot directly pass local function to Invoke(...)
Action actionToInvoke = delegate
{
if (!_isVerbose)
{
OutputWindowSimple(this._messageBytes, Source.Receive);
}
else
{
OutputWindowVerbose(s, Source.Receive);
}
// DO NOT toggle on button when receive "erasing in progress" message
if (AcksThatSuppressButtonToggling.ContainsIEumerableObject(_messageBytes))
{
toggleCommandButtons(false);
Debug.WriteLine("Waiting for process");
MessageBox.Show("This would take about 3 mins, please wait.");
}
else
{
toggleCommandButtons(true);
}
}; // end actionToInvoke
Dispatcher.BeginInvoke(actionToInvoke); // end event handle settings
}// end local function handler
Connection.SetEventHandler(handler);
Connection.Connect();
btn_Connect.Content = "斷線";
byte[] bitarr = setSay012_Whole.ToArray();
Connection.WriteBytes(bitarr, 0, setSay012_Whole.Length);
COMSelector !.IsEnabled = false;
OutputWindowVerbose(BitConverter.ToString(bitarr), Source.Send);
}
// General connection problem
catch (System.IO.IOException ex)
{
MessageBox.Show(ConnectionFailed + ". Please retry");
Debug.WriteLine("Exception thrown:" + ex.Message);
Connection?.Dispose();
}
// The COM port is occupiued by another process
catch (UnauthorizedAccessException uex)
{
MessageBox.Show(ConnectionFailed + ". Is another process using this COM Port?", uex.Message,
MessageBoxButton.OK, MessageBoxImage.Error);
}
finally
{
Connection?.Dispose();
Connection = null;
}
// Wait to avoid stuck of ACC
await Task.Run(() => { Task.Delay(3000); });
toggleCommandButtons(Connection?.IsConnected ?? false);
btn_Connect.IsEnabled = true;
}
}