I would monitor data received on a Serial port with my pc and a Arduino.
On the arduino, the sketch send thorugt the USB the string "aabb" evry 300ms.
With pc I want listen, and in real time print the string in a control (Textbox). To do that, I create a new thread which listen in a Loop what arrives in Serial port, and when it happens it write by a Invoke the string in textbox. The procedures works if I deploy in the form's class but if I use a external class it doesn't. To explain better the matter, I paste the code of the class
class SerialPortManager
{
public SerialPort Serial = new SerialPort();
private Thread thr;
private string Log;
public TextBox textLog;
public string LastString;
public bool thrIsAlive;
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[EditorBrowsable(EditorBrowsableState.Advanced)]
[IODescriptionAttribute("ControlInvokeRequiredDescr")]
public bool InvokeRequired { get; private set; }
//DISPOSE
public void Dispose()
{
this.Dispose();
}
//SET Textobox LOG
public void SetLogTxtB (TextBox txt)
{
textLog = txt;
}
//PORTE DISPONIBILI
public string[] Available_Ports()
{
return SerialPort.GetPortNames();
}
//COSTRUTTORI
public SerialPortManager(string portname, int baudrate,bool InitializeConn)
{
Serial.BaudRate = baudrate;
Serial.PortName = portname;
if (InitializeConn == true) Serial.Open();
}
public SerialPortManager()
{
}
//SETTA I PARAMETRI E INIZIALIZZA LA CONNESSIONE
public void SetConnectionParam(string portname, int baudrate, bool initializeConn)
{
Serial.Close();
Serial.Dispose();
Serial = new SerialPort();
Serial.BaudRate = baudrate;
Serial.PortName = portname;
if (initializeConn == true) Serial.Open();
}
//ASYNC LISTENER
public void AsyncListener()
{
thrIsAlive = true;
thr = new Thread(ThreadReader);
thr.Start();
}
//PROCEDURA PER APPEND
public void AppendTextBox(string value)
{
if (InvokeRequired)
{
this.Invoke(new Action<string>(AppendTextBox), new object[] { value });
return;
}
textLog.Text += value;
}
private void Invoke(Action<string> action, params object[] v)
{
throw new NotImplementedException();
}
void ThreadReader()
{
while (thrIsAlive)
{
string temp = Serial.ReadLine();
LastString = temp;
Log += LastString + "\n";
AppendTextBox(LastString + "\n");
}
}
}
In the form I write three rows
SerialPortManager PortMan = new Driver_Arduin.SerialPortManager("COM3", 9600,true);
PortMan.SetLogTxtB(textBox1);
PortMan.AsyncListener();
If I try to run program it returns the error " cross-thread operation not allowed". Now, while I posting this ask, I decide to do a last try and change the method AppendTextBox to :
public void AppendTextBox(string value)
{
if (textLog.InvokeRequired)
{
try
{
textLog.Invoke(new Action<string>(AppendTextBox), new object[] { value });
return;
}
catch (ObjectDisposedException)
{
thrIsAlive = false;
}
}
textLog.Text += value;
}
And It Finally works. Now ascertained the power of Stackoverflow that solved the problem before posting, I would know why my code works. Thank you
In SerialPortManager you must use delegate instead windows control.
class SerialPortManager
{
public SerialPort Serial = new SerialPort();
private Thread thr;
private string Log;
//public TextBox textLog;
public Action<string> textLog;
.....
Crete in you form simply method:
public void SetTextBoxText(string value)
{
if (textBox1.InvokeRequired)
{
try
{
textBox1.Invoke(new Action<string>(AppendTextBox), new object[] { value });
return;
}
catch (ObjectDisposedException)
{
thrIsAlive = false;
}
}
textBox1.Text += value;
}
Set delegate to PortMan:
SerialPortManager PortMan = new Driver_Arduin.SerialPortManager("COM3", 9600,true);
PortMan.SetLogTxtB=new Action<string>(SetTextBoxText);
PortMan.AsyncListener();
If need output log to TextBox of PortMan call textLog delegate.
void ThreadReader()
{
while (thrIsAlive)
{
string temp = Serial.ReadLine();
LastString = temp;
Log += LastString + "\n";
//AppendTextBox(LastString + "\n");
textLog(LastString + "\n");
}
}
Apart from that your Invoke method in SerialPortManager should throw NotImplementedException the problem is that you define your own InvokeRequired/Invoke.
You need to use these methods provided by a WinForms control such that it knows whether your code is running inside the thread (UI thread) that created the control and how it can change context to this thread.
Actually it seems you may use your SerialPortManager but make use of InvokeRequired/Invoke of textLog like you're already doing in AppendTextBox.
BTW, if (initializeConn == true) is rather useless - if (initializeConn) is sufficient.
Related
I am writing a program which is supposed to detect when a USB serial device is plugged in and then log on to the new com port. The code below works wonderfully, but I have noticed in debugging the code and stepping through it that the event handler "DetectChange" fires twice. I'm not sure that this is normal, or an action of the debugger.
In any case, the code works, but I am new at event handling and I would like to make sure that I am not going to cause any issues as I add more code to actually read and write from the serial port.
(I got some of this code from stackoverflow, but I have misplaced my paper with names for attribution. If you see your code below, my heartfelt thanks.)
using System;
using System.IO.Ports;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Management;
using System.Threading;
namespace SerialTest
{
public partial class Form1 : Form
{
SerialMethods serialMethods = new SerialMethods();
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
loadCmdBox();
}
private void CmdBoxPort_SelectedIndexChanged(object sender, EventArgs e)
{
handleComPort();
}
private void handleComPort()
{
// Set the right port for the selected item.
// The portname is based on the "COMx" part of the string (SelectedItem)
string item = CmdBoxPort.SelectedItem.ToString();
// Search for the expression "(COM" in the "selectedItem" string
if (item.Contains("(COM"))
{
// Get the index number where "(COM" starts in the string
int indexOfCom = item.IndexOf("(COM");
// Set PortName to COMx based on the expression in the "selectedItem" string
// It automatically gets the correct length of the COMx expression to make sure
// that also a COM10, COM11 and so on is working properly.
string PortName = item.Substring(indexOfCom + 1, item.Length - indexOfCom - 2);
if (serialMethods._serialPort.IsOpen)
{
serialMethods._serialPort.Close();
serialMethods.Connect(PortName);
label5.Text = "Active Port: " + PortName;
}
else
{
serialMethods.Connect(PortName);
label5.Text = PortName;
}
}
else
return;
}
private void loadCmdBox()
{
// Get all serial (COM)-ports you can see in the devicemanager
ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\cimv2",
"SELECT * FROM Win32_PnPEntity WHERE ClassGuid=\"{4d36e978-e325-11ce-bfc1-08002be10318}\"");
// Sort the items in the combobox
CmdBoxPort.Sorted = true;
// Add all available (COM)-ports to the combobox
foreach (System.Management.ManagementObject queryObj in searcher.Get().Cast<ManagementObject>())
{
CmdBoxPort.Items.Add(queryObj["Caption"]);
}
SerialPortService.PortsChanged += (sender1, changedArgs) => DetectChange(changedArgs.EventType);
label2.Text = "";
label3.Text = "";
label4.Text = "";
}
protected Task<Task> getSerPorts()
{
CmdBoxPort.Text = "";
CmdBoxPort.Update();
if (!String.IsNullOrEmpty(CmdBoxPort.Text))
{
handleComPort();
return Task.FromResult(Task.CompletedTask);
}
else
{
loadCmdBox();
return Task.FromResult(Task.CompletedTask);
}
}
private void ExitButton_Click(object sender, EventArgs e)
{
SerialPortService.CleanUp();
this.Close();
}
private void RefreshButton_Click(object sender, EventArgs e)
{
refresh();
}
protected Task<Task> refresh()
{
label2.Text = "";
label3.Text = "";
label4.Text = "";
CmdBoxPort.Items.Clear();
getSerPorts();
return Task.FromResult(Task.CompletedTask);
}
protected virtual void DetectChange(EventType changedArgs)
{
if (changedArgs == EventType.Insertion)
{
try
{
Task tr = (Task)Invoke(new Action( () => { getSerPorts(); }));
Task rr = (Task)Invoke(new Action(() => { refresh(); }));
}
catch (Exception ex) { MessageBox.Show("Exception at insertion invoke method " + ex, "Exception", MessageBoxButtons.OK); }
}
else if (changedArgs == EventType.Removal)
{
try
{
Task tr = (Task)Invoke(new Action( () => { getSerPorts(); }));
Task rr = (Task)Invoke(new Action(() => { refresh(); }));
}
catch (Exception ex) { MessageBox.Show("Exception at removal invoke method " + ex, "Exception", MessageBoxButtons.OK); }
}
return;
}
}
public static class SerialPortService
{
private static SerialPort _serialPort;
private static string[] _serialPorts;
private static ManagementEventWatcher arrival;
private static ManagementEventWatcher removal;
private static readonly SerialMethods SD = new SerialMethods();
static SerialPortService()
{
_serialPorts = SerialPort.GetPortNames();
MonitorDeviceChanges();
}
public static void CleanUp()
{
arrival.Stop();
removal.Stop();
}
public static event EventHandler<PortsChangedArgs> PortsChanged;
private static void MonitorDeviceChanges()
{
try
{
var deviceArrivalQuery = new WqlEventQuery("SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 2");
var deviceRemovalQuery = new WqlEventQuery("SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 3");
arrival = new ManagementEventWatcher(deviceArrivalQuery);
removal = new ManagementEventWatcher(deviceRemovalQuery);
arrival.EventArrived += (o, args) => RaisePortsChangedIfNecessary(EventType.Insertion);
removal.EventArrived += (sender, eventArgs) => RaisePortsChangedIfNecessary(EventType.Removal);
// Start listening for events
arrival.Start();
removal.Start();
}
catch (ManagementException err)
{
MessageBox.Show("Management exception = " + err, "Info", MessageBoxButtons.OK);
}
}
private static void RaisePortsChangedIfNecessary(EventType eventType)
{
lock (_serialPorts)
{
var availableSerialPorts = SerialPort.GetPortNames();
if (eventType == EventType.Insertion)
{
var added = availableSerialPorts.Except(_serialPorts).ToArray();
_serialPorts = availableSerialPorts;
PortsChanged.Raise(null, new PortsChangedArgs(eventType, added));
}
else if (eventType == EventType.Removal)
{
var removed = _serialPorts.Except(availableSerialPorts).ToArray();
_serialPorts = availableSerialPorts;
PortsChanged.Raise(null, new PortsChangedArgs(eventType, removed));
}
}
}
public static void Raise<T>(this EventHandler<T> handler, object sender, T args) where T : EventArgs
{
handler?.Invoke(sender, args);
}
}
public enum EventType
{
Insertion,
Removal,
}
public class PortsChangedArgs : EventArgs
{
private readonly EventType _eventType;
private readonly string[] _serialPorts;
public PortsChangedArgs(EventType eventType, string[] serialPorts)
{
_eventType = eventType;
_serialPorts = serialPorts;
}
public string[] SerialPorts => _serialPorts;
public EventType EventType => _eventType;
}
}
Just took a short look at this. It seems like getSerPorts() will always execute loadCmdBox() (CmdBoxPort.Text = ""; ... if (!String.IsNullOrEmpty(CmdBoxPort.Text))) that will attach a new event handler (previous attached event handlers will not be removed by attaching a new one).
You should either remove the existing event handler befor attaching a new one or only attach the event handler once.
Hi,
I'm trying to write a UDP-client that listens to a port, and then display the incoming data in a textbox.
I have written a class; UDP_Receive() that starts a backgroundworker that listens to a specified port and receives the data. The code is based on this question; C# .Net receiving UDp packets in separater thread and application exit
I think I have solved the issues with the blocking .receive() by following the accepted answer in this question; How can I safely terminate UdpClient.receive() in case of timeout?
My question is how do I get the data I receive in the backgroundworkerthread (that I created in my class) back to the mainthread, so that I can display it in a textbox?
I thought of using Invoke, but I don't have any references to the textbox in my class.
textBox_UdpPositionInData.Invoke(new EventHandler(delegate
{
textBox_UdpPositionInData.Text = receivedData;
}));
I found a very similar question about a tcp-server, but I can't see how to apply that solution here Send data from a background thread to the main thread
Any thoughts or suggestions are of course much appreciated!
Many Thanks!
internal class UDP_Receive
{
private int _portToListen = 2003;
private volatile bool listening;
BackgroundWorker _backgroundWorker;
//Constructor
public UDP_Receive()
{
Debug.WriteLine("Constructor: UDP_Receive");
this.listening = false;
}
public void StartListener()
{
if ( (_backgroundWorker==null) || (!_backgroundWorker.IsBusy))
{
_backgroundWorker = new BackgroundWorker();
_backgroundWorker.DoWork += listenForUDPPackages_DoWork;
_backgroundWorker.RunWorkerCompleted +=listenForUDPPackages_RunWorkerCompleted;
_backgroundWorker.WorkerSupportsCancellation = true;
_backgroundWorker.RunWorkerAsync();
Debug.WriteLine("Creates a new thread: " + _backgroundWorker.ToString() );
// We are listening
this.listening = true;
}
}
public void StopListener()
{
// The user cancelled the UDP Port listening
this.listening = false;
// Cancel the backgroundworker
_backgroundWorker.CancelAsync();
// Debug
Debug.WriteLine("Stops current thread: " + _backgroundWorker.ToString());
}
public bool IsListening
{
get { return this.listening; }
}
public int PortToListen
{
get { return this._portToListen; }
set { this._portToListen = value; }
}
private void listenForUDPPackages_DoWork(object sender, DoWorkEventArgs ev)
{
UdpClient? listener = null;
try
{
listener = new UdpClient(_portToListen);
}
catch (SocketException)
{
//do nothing
}
if (listener != null)
{
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, _portToListen);
try
{
while (this.listening)
{
Debug.WriteLine("Waiting for UDP broadcast to port " + _portToListen);
byte[] receivedBytes = new byte[1024];
string receivedData;
bool timeTracker = TrackFunction(TimeSpan.FromSeconds(2), () =>
{
receivedBytes = listener.Receive(ref groupEP);
});
Debug.WriteLine("Timetracker result: " + timeTracker.ToString());
if (receivedBytes == null || receivedBytes.Length == 0)
{
// We did not recieve any data
Debug.WriteLine("No data received befor Time out ");
}
else
{
// We managed to receive some data!
// No we want to process the data and then send the result to the Thread that initiated the class.
receivedData = Encoding.Default.GetString(receivedBytes);
Debug.WriteLine("Data received: " + receivedData);
}
}
catch (Exception e)
{
Debug.WriteLine("Exception: " + e.ToString());
}
finally
{
listener.Close();
Debug.WriteLine("Finally: Done listening for UDP broadcast");
}
}
else
{
Debug.WriteLine("Error: UdpClient(_portToListen) returned null");
}
}
private void listenForUDPPackages_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e == null || e.Result == null)
{
Debug.WriteLine("listenForUDPPackages_RunWorkerCompleted e = null");
}
else
{
if (e.Cancelled)
{
Debug.WriteLine("Operation was canceled");
}
else if (e.Error != null)
{
Debug.WriteLine("Error: " + e.Error.Message);
}
else
{
Debug.WriteLine("Result: " + e.Result.ToString());
}
}
}
private static bool TrackFunction(TimeSpan timeSpan, Action codeBlock)
{
try
{
Task task = Task.Factory.StartNew(() => codeBlock());
task.Wait(timeSpan);
return task.IsCompleted;
}
catch (AggregateException ae)
{
throw ae.InnerExceptions[0];
}
}
}
You can write this kind of code to keep the UI separate from the UDP_Receive class:
internal class UDP_Receive
{
private Action<string> _invoke;
public UDP_Receive(Action<string> invoke)
{
_invoke = invoke;
}
public void Foo()
{
_invoke("Hello");
}
}
When you declare the class you then do it like this:
var ur = new UDP_Receive(t => textBox.Invoke(() => textBox.Text = t));
Now it's just a matter of calling ur.Foo() (in my example) to update the UI.
I trying to allow people to write to NFC tags using my app, so that my app gets launched with a custom parameter. I want to be able to reprogram NFC tags which already have data on them.
I am using the following code but the problem is, that WP always recognizes the action which is already on the NFC tag and interrupts because it wants to launch the NFC tag action which was written anytime before.
How can I tell the OS to stop triggering the action of the tag so that I can immediately rewrite it?
public enum NfcHelperState
{
Initializing,
Waiting,
Ready,
Writing,
Finished,
Error,
NoDeviceFound
}
public class NfcHelper
{
private NfcHelperState _state = NfcHelperState.Initializing;
public NfcHelperState State
{
get { return _state; }
}
private ProximityDevice _nfcDevice;
private long _subscriptionId;
public NfcHelper()
{
Init();
}
public void Init()
{
UpdateState();
_nfcDevice = ProximityDevice.GetDefault();
if (_nfcDevice == null)
{
UpdateState(NfcHelperState.NoDeviceFound);
return;
}
UpdateState(NfcHelperState.Waiting);
}
private void UpdateState(NfcHelperState? state = null)
{
if (state.HasValue)
{
_state = state.Value;
}
if (OnStatusMessageChanged != null)
{
OnStatusMessageChanged(this, _state);
}
}
public void WriteToTag()
{
UpdateState(NfcHelperState.Ready);
_subscriptionId = _nfcDevice.SubscribeForMessage("WriteableTag", WriteableTagDetected);
}
private void WriteableTagDetected(ProximityDevice sender, ProximityMessage message)
{
UpdateState(NfcHelperState.Writing);
try
{
var str = "action=my_custom_action";
str += "\tWindowsPhone\t";
str += CurrentApp.AppId;
_nfcDevice.PublishBinaryMessage("LaunchApp:WriteTag", GetBufferFromString(str),
WriteToTagComplete);
}
catch (Exception e)
{
UpdateState(NfcHelperState.Error);
StopWaitingForTag();
}
}
private void WriteToTagComplete(ProximityDevice sender, long messageId)
{
sender.StopPublishingMessage(messageId);
UpdateState(NfcHelperState.Finished);
StopWaitingForTag();
}
private void StopWaitingForTag()
{
_nfcDevice.StopSubscribingForMessage(_subscriptionId);
}
private static IBuffer GetBufferFromString(string str)
{
using (var dw = new DataWriter())
{
dw.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf16LE;
dw.WriteString(str);
return dw.DetachBuffer();
}
}
public delegate void NfcStatusMessageChangedHandler(object myObject, NfcHelperState newState);
public event NfcStatusMessageChangedHandler OnStatusMessageChanged;
}
WriteToTag is called when a button in my app is tapped and the app waits for a writable tag. If a writable tag is recognized, WriteableTagDetected gets called and immediately starts the writing process. However, this is interrupted by the WP dialog which asks whether to perform the NFC action or not. After writing, WriteToTagComplete should be called, where StopWaitingForTag gets called and ends the write process.
I hope you guys can help me :)
Turns out I thought the wrong way. I didn't need to wait for a tag to arrive in order to rewrite it. In fact, there's no need to do _nfcDevice.SubscribeForMessage("WriteableTag", WriteableTagDetected); before writing. Just start using PublishBinaryMessage and it will write to the tag once it arrives at the device.
My final code looks like the following:
public enum NfcHelperState
{
Initializing,
Ready,
WaitingForWriting,
FinishedWriting,
ErrorWriting,
NoDeviceFound
}
public class NfcHelper
{
private NfcHelperState _state = NfcHelperState.Initializing;
public NfcHelperState State
{
get { return _state; }
}
private ProximityDevice _nfcDevice;
private long? _writingMessageId;
public NfcHelper()
{
Init();
}
public void Init()
{
UpdateState();
_nfcDevice = ProximityDevice.GetDefault();
if (_nfcDevice == null)
{
UpdateState(NfcHelperState.NoDeviceFound);
return;
}
UpdateState(NfcHelperState.Ready);
}
private void UpdateState(NfcHelperState? state = null)
{
if (state.HasValue)
{
_state = state.Value;
}
if (OnStatusMessageChanged != null)
{
OnStatusMessageChanged(this, _state);
}
}
public void WriteToTag()
{
StopWritingMessage();
UpdateState(NfcHelperState.WaitingForWriting);
try
{
var str = new StringBuilder();
str.Append("action=my_custom_action");
str.Append("\tWindowsPhone\t{");
str.Append(CurrentApp.AppId);
str.Append("}");
_writingMessageId = _nfcDevice.PublishBinaryMessage("LaunchApp:WriteTag", GetBufferFromString(str.ToString()),
WriteToTagComplete);
}
catch
{
UpdateState(NfcHelperState.ErrorWriting);
StopWritingMessage();
}
}
private void WriteToTagComplete(ProximityDevice sender, long messageId)
{
UpdateState(NfcHelperState.FinishedWriting);
StopWritingMessage();
}
private void StopWritingMessage()
{
if (_writingMessageId.HasValue)
{
_nfcDevice.StopPublishingMessage(_writingMessageId.Value);
_writingMessageId = null;
}
}
private static IBuffer GetBufferFromString(string str)
{
using (var dw = new DataWriter())
{
dw.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf16LE;
dw.WriteString(str);
return dw.DetachBuffer();
}
}
public delegate void NfcStatusMessageChangedHandler(object myObject, NfcHelperState newState);
public event NfcStatusMessageChangedHandler OnStatusMessageChanged;
}
I'm trying to run the timer tick event which initially runs on my windows form,also when loaded on another class using a thread. I tried calling the timer event on another thread it didn't help. Am I supposed to use the same timer or create a new timer for that thread. This is my current implementation:
namespace XT_3_Sample_Application
{
public partial class Form1 : Form
{
Queue<string> receivedDataList = new Queue<string>();
System.Timers.Timer tmrTcpPolling = new System.Timers.Timer();
public Form1()
{
InitializeComponent();
TM702_G2_Connection_Initialization();
}
static void threadcal()
{
Class1 c = new Class1();
c.timer_start();
c.test("192.168.1.188",9999);
}
public string Connection_Connect(string TCP_IP_Address, int TCP_Port_Number)
{
if (tcpClient.Connected)
{
Socket_Client = tcpClient.Client;
TcpStreamReader_Client = new StreamReader(tcpClient.GetStream(), Encoding.ASCII);
tmrTcpPolling.Start();
Status = "Connected\r\n";
}
else
{
Status = "Cannot Connect\r\n";
}
}
public string Connection_Disconnect()
{
tmrTcpPolling.Stop();
// do something
return "Disconnected\r\n";
}
void TM702_G2_Connection_Initialization()
{
tmrTcpPolling.Interval = 1;
tmrTcpPolling.Elapsed += new ElapsedEventHandler(tmrTcpPolling_Elapsed);
}
#region Timer Event
void tmrTcpPolling_Elapsed(object sender, ElapsedEventArgs e)
{
try
{
if (tcpClient.Available > 0)
{
receivedDataList.Enqueue(TcpStreamReader_Client.ReadLine());
}
}
catch (Exception)
{
//throw;
}
}
private void tmrDisplay_Tick(object sender, EventArgs e)
{
Tick();
}
public void Tick()
{
Console.Write("tick" + Environment.NewLine);
if (receivedDataList.Count > 0)
{
string RAW_Str = receivedDataList.Dequeue();
//tbxConsoleOutput.AppendText(RAW_Str + Environment.NewLine);
tbxConsoleOutput.AppendText(Parser_Selection(RAW_Str) + Environment.NewLine);
}
}
#endregion
private void btnConnect_Click(object sender, EventArgs e)
{
tbxConsoleOutput.AppendText(Connection_Connect(tbxTCPIP.Text, Convert.ToInt32(tbxPort.Text, 10)));
Thread t = new Thread(threadcal);
t.Start();
}
}
}
But the timer tick event starts the moment the application is launched but not on button click - private void btnConnect_Click(object sender, EventArgs e).
I'm trying to call a separate thread for the class Class1's test method. I'm trying to use a similar timer event to receive output from the server, for this thread.
namespace XT_3_Sample_Application
{
class Class1
{
TcpClient tcpClient;
Socket Socket_Client;
StreamReader TcpStreamReader_Client; // Read in ASCII
Queue<string> receivedDataList = new Queue<string>();
System.Timers.Timer tmrTcpPolling = new System.Timers.Timer();
void TM702_G2_Connection_Initialization()
{
tmrTcpPolling.Interval = 1;
tmrTcpPolling.Elapsed += new ElapsedEventHandler(tmrTcpPolling_Elapsed);
}
public void test(string TCP_IP_Address, int TCP_Port_Number)
{
TM702_G2_Connection_Initialization();
try
{
string Status = "";
Ping pingSender = new Ping();
PingOptions options = new PingOptions();
PingReply reply = pingSender.Send(TCP_IP_Address, timeout, buffer, options);
if (reply.Status == IPStatus.Success)
{
tcpClient = new TcpClient();
tcpClient.Connect(TCP_IP_Address, TCP_Port_Number);
if (tcpClient.Connected)
{
Socket_Client = tcpClient.Client;
TcpStreamReader_Client = new StreamReader(tcpClient.GetStream(), Encoding.ASCII);
tmrTcpPolling.Start();
Status = "Connected\r\n";
}
else
{
Status = "Cannot Connect\r\n";
}
}
else
{
Status = "Ping Fail\r\n";
}
MessageBox.Show(TCP_IP_Address + " :" + Status);
}
catch (System.Exception ex)
{
MessageBox.Show(TCP_IP_Address + " :" + ex.Message);
}
setFilterType();
setButtonRadioLvl();
heloCmd();
}
public void timer_Start()
{
Form1 f = new Form1();
f.Tick();
}
}
}
When tried the above method the timer is not fired on the new thread. Any suggestions on this?
Without any blocking code or loop your thread will not live long. the following calls your test method every one second and doesn't use timer
static void threadcal()
{
while (true)
{
Thread.Sleep(1000);
Class1 c = new Class1();
c.test("192.168.1.188", 9999);
}
}
I am working on converting a console application into a windowed format and as someone who knows little about it but has had experience with a similar application already in window format in the past I figured it wouldn't be too hard.
So I created a form and added a textbox to it just to get the logging information to start with.
This console app used to run in a single thread, I have since added a second thread to allow the form to run side by side with the console for testing. (it runs fine in a single thread strangely now too).
This is the code I am using to write text to the form except that I am not getting ANYTHING at all on the form.
static Form1 f = new Form1();
delegate void SetTextCallback(string s);
private void SetText(string text)
{
// InvokeRequired required compares the thread ID of the
// calling thread to the thread ID of the creating thread.
// If these threads are different, it returns true.
if (f.textBox1.InvokeRequired)
{
SetTextCallback d = new SetTextCallback(SetText);
f.textBox1.Invoke(d, new object[] { text });
}
else
{
f.textBox1.AppendText(text);
}
}
I can confirm that there is text entering the "text" variable but it is not getting to the form.
Any help would be appreciated.
This is the full file:
using System;
using System.Windows.Forms;
using Chraft.Properties;
using System.IO;
using Chraft.Plugins.Events.Args;
using Chraft.Plugins.Events;
namespace Chraft
{
public class Logger
{
private StreamWriter WriteLog;
private Server Server;
internal Logger(Server server, string file)
{
Server = server;
try
{
WriteLog = new StreamWriter(file, true);
WriteLog.AutoFlush = true;
}
catch
{
WriteLog = null;
}
}
~Logger()
{
try
{
WriteLog.Close();
}
catch
{
}
}
public void Log(LogLevel level, string format, params object[] arguments)
{
Log(level, string.Format(format, arguments));
}
public void Log(LogLevel level, string message)
{
//Event
LoggerEventArgs e = new LoggerEventArgs(this, level, message);
Server.PluginManager.CallEvent(Event.LOGGER_LOG, e);
if (e.EventCanceled) return;
level = e.LogLevel;
message = e.LogMessage;
//End Event
LogToConsole(level, message);
LogToForm(level, message);
LogToFile(level, message);
}
private void LogToConsole(LogLevel level, string message)
{
if ((int)level >= Settings.Default.LogConsoleLevel)
{
Console.WriteLine(Settings.Default.LogConsoleFormat, DateTime.Now, level.ToString().ToUpper(), message);
}
}
static Form1 f = new Form1();
delegate void SetTextCallback(string s);
private void SetText(string text)
{
// InvokeRequired required compares the thread ID of the
// calling thread to the thread ID of the creating thread.
// If these threads are different, it returns true.
if (f.textBox1.InvokeRequired)
{
SetTextCallback d = new SetTextCallback(SetText);
f.textBox1.Invoke(d, new object[] { text });
}
else
{
f.textBox1.AppendText(text);
}
}
private void LogToForm(LogLevel level, string message)
{
if ((int)level >= Settings.Default.LogConsoleLevel)
{
SetText(DateTime.Now + level.ToString().ToUpper() + message);
}
}
private void LogToFile(LogLevel level, string message)
{
if ((int)level >= Settings.Default.LogFileLevel && WriteLog != null)
WriteLog.WriteLine(Settings.Default.LogFileFormat, DateTime.Now, level.ToString().ToUpper(), message);
}
public void Log(Exception ex)
{
//Event
LoggerEventArgs e = new LoggerEventArgs(this, LogLevel.Debug, ex.ToString(), ex);
Server.PluginManager.CallEvent(Event.LOGGER_LOG, e);
if (e.EventCanceled) return;
//End Event
Log(LogLevel.Debug, ex.ToString());
}
public enum LogLevel : int
{
Trivial = -1,
Debug = 0,
Info = 1,
Warning = 2,
Caution = 3,
Notice = 4,
Error = 5,
Fatal = 6
}
}
}
The problem is that you are creating two Form objects. One that is created in your Program.cs file:
Application.Run(new Form1());
And the one you created in your logger class
Form f = new Form1();
The one passed to Application.Run is the one that the user is interacting with. It has become visible and responds to user interaction because of the Application.Run call.
The one you created on your logger class just sits there in memory. Its TextBox is happily adding the text you ask it to, but that one isn't visible anywhere.
There are many ways to handle this situation. You could gain access to the correct Form object through Application.OpenForms, but a more appropriate way to handle it would be to add an event on the logger that the form can subscribe to and it can handle updating the TextBox in response to the event.
Updated
class LoggerLogEventArgs : EventArgs
{
public LoggerLogEventArgs(string message)
{
this.message = message;
}
private string message;
public string Message { get { return message; } }
}
class Logger
{
public event EventHandler<LoggerLogEventArgs> Logged;
protected virtual void OnLogged(LoggerLogEventArgs e)
{
EventHandler<LoggerLogEventArgs> handler = Logged;
if (handler != null)
handler(this, e);
}
// I would change this method name to LogToEvent
private void LogToForm(LogLevel level, string message)
{
if ((int)level >= Settings.Default.LogConsoleLevel)
{
OnLogged(new LoggerLogEventArgs(message));
}
}
}
class Form1 : Form
{
// Subscribe to the logger only when we are ready to display text
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
GetLog().Logged += new EventHandler<LoggerLogEventArgs>(logger_Logged);
}
// Unsubscribe from the logger before we are no longer ready to display text
protected override void OnHandleDestroyed(EventArgs e)
{
GetLog().Logged -= new EventHandler<LoggerLogEventArgs>(logger_Logged);
base.OnHandleDestroyed(e);
}
private void logger_Logged(object sender, LoggerLogEventArgs e)
{
if (InvokeRequired)
BeginInvoke(new EventHandler<LoggerLogEventArgs>(logger_Logged), e);
else
textBox1.AppendText(e.Message);
}
}
hello i try this it works ( I make a console application and I add a windows form)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Permissions;
using System.Windows.Forms;
namespace ConsoleApplication6
{
class Program
{
delegate void SetTextCallback(string s);
static Form1 f;
static void Main(string[] args)
{
f = new Form1();
f.Show();
SetText("test");
Console.ReadLine();
}
private static void SetText(string text)
{
// InvokeRequired required compares the thread ID of the
// calling thread to the thread ID of the creating thread.
// If these threads are different, it returns true.
if (f.textBox1.InvokeRequired)
{
SetTextCallback d = new SetTextCallback(SetText);
f.textBox1.Invoke(d, new object[] { text });
}
else
{
f.textBox1.AppendText(text);
}
}
}
}