Serial Port BytesToRead always 0

[yehiga1467]

Hello everyone, I made a class that will do some additional configuration to the serial port. (Mainly to handle received data). My issue is that SerialPort_DataReceived() is successfully triggered when it received data from device, however the BytesToRead is always 0. What could the reason be? I am sure the device is sending data because when I haven't use this ConfigSerialPort, everything works fine. ConfigSerialPort.h

#pragma once
using namespace System::Windows::Forms;

ref class ConfigSerialPort: public System::Windows::Forms::Control
{

private: System::IO::Ports::SerialPort^ \_serialPort;

public:
	ConfigSerialPort(System::IO::Ports::SerialPort^ serialPort) {
		\_serialPort = serialPort;
		
    //handle received data
		\_serialPort->DataReceived += gcnew System::IO::Ports::SerialDataReceivedEventHandler(this, &ConfigSerialPort::SerialPort\_DataReceived);
	
	}
	
private: 	System::Void SerialPort\_DataReceived(System::Object^ sender, System::IO::Ports::SerialDataReceivedEventArgs^ e)
{
    unsigned int test = 0;

    test = \_serialPort->BytesToRead; **// BytesToRead is ALWAYS Zero**
}

}

MyForm.h

#pragma once

#include #include #include #include #include "ConfigSerialPort.h"

namespace SerialPortGUI {

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;

using namespace System::IO;
using namespace System::Runtime::Serialization::Formatters::Binary;






/// /// Summary for MyForm
/// 
public ref class MyForm : public System::Windows::Forms::Form
{
	public:
		MyForm(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}
		.
		.
		.
		
		
		void InitializeComponent(void)
		{
			.
			.
			.
			this->Load += gcnew System::EventHandler(this, &MyForm::MyForm\_Load);
		   this->MyForm\_SerialPort = (gcnew System::IO::Ports::SerialPort(this->components));
		   
			.
			.
			.

		}
	private: ConfigSerialPort^ test;
	private: System::Void MyForm\_Load(System::Object^ sender, System::EventArgs^ e) {
	
	// initialize Serial port (already done via the designer)
	test = gcnew ConfigSerialPort(MyForm\_SerialPort);
	
	}
}

}

[Lost User]

What is the serial port connected to, and how can you tell there is data to be read?

[cibec75455 frnla com]

Hello, my other device is an Arduino that connects to PC as Com port 8. Every time I press a button on Arduino, it will transmit a text over serial to the PC. I have verified the received text using Termite software.

[Lost User]

It's impossible to guess why your receiver thinks there is no data to read, if it is being transmitted.

[cibec75455 frnla com]

The only think I could think of is inside

ConfigSerialPort.h

I should use gcnew for _serialPort

_serialPort = gcnew (System::IO::Ports::SerialPort);

, and then assign it the parameter

_serialPort = serialPort