How to convert below java code into C# dotnet

Question

1.80/5 (3 votes)

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Java

System.out.println("Trying to open port...");
           CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier(comPort);
           port = (SerialPort)portId.open("SMS Transceiver", 10);
           port.setSerialPortParams(boardRates, dataBits, stopBits, 0);
           out = new OutputStreamWriter(port.getOutputStream(), "ISO-8859-1");
           in = new InputStreamReader(port.getInputStream(), "ISO-8859-1");
           System.out.println("Port is opened successfully..... \n");
           Thread.sleep(10000L);

What I have tried:

C#

Console.WriteLine("Trying to open port...");
Console.WriteLine(comPort);
port = new System.IO.Ports.SerialPort(comPort);
port.Open();
SerialPort Serial1 = new System.IO.Ports.SerialPort(comPort, boardRates, Parity.None, dataBits);
port.Encoding = Encoding.GetEncoding("iso-8859-1");
Console.WriteLine("Port is opened successfully..... \n");
Thread.Sleep(10000);

Posted 25-May-16 0:33am

Member 12363094

Updated 25-May-16 5:24am

Leo Chapiro

v3

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Comments

Richard MacCutchan 25-May-16 6:38am

Please show the code you have tried, and explain what the error is, and where it occurs.

Member 12363094 25-May-16 6:42am

Console.WriteLine("Trying to open port...");
Console.WriteLine(comPort);
port = new System.IO.Ports.SerialPort(comPort);
port.Open();
SerialPort Serial1 = new System.IO.Ports.SerialPort(comPort, boardRates, Parity.None, dataBits);
port.Encoding = Encoding.GetEncoding("iso-8859-1");
Console.WriteLine("Port is opened successfully..... \n");
Thread.Sleep(10000);

Member 12363094 25-May-16 6:45am

above code i have mention streamreader sout=null& streamwriter sin=null;
wen i was sending AT commands(modem) to port then i have to use like
sout.write(AT).
in this case i am getting null reference exception

Richard MacCutchan 25-May-16 7:06am

If sout is null then sout.write cannot work; basic OOP.

Member 12363094 25-May-16 7:15am

then how to convert
out = new OutputStreamWriter(port.getOutputStream(), "ISO-8859-1");to dotnet

Richard MacCutchan 25-May-16 7:29am

See https://msdn.microsoft.com/en-us/library/system.io.streamwriter.aspx.

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George Jonsson · Answer 1 · 2016-05-25T05:24:00

Solution 1

It is usually not a good idea to just try to convert code from one language to another line by line.
Sometimes it works, but sometimes not.

Instead try to analyze the code you want to translate and understand what it is supposed to do and then find out how to do it in another language.

In your case it looks like you want to

1. Open a specific COM port.
2. Set communication parameters
3. Write data
4. Read data

But more than this I cannot know, because you don't give that information.
So you need to do this analyse.

For example what kind of communication do you want to do?
* Is it a master - slave setup where one side is always sending data and the other side only respond?
* Who is the master? The PC or the device?
* Will the connected device send data at any time, like a barcode reader?

What do you in general need to do in C# to communicate over a serial port?

1. Set up the communication parameters

C#

string portName = "COM1";
int baudRate = 9600;
Parity parity = Parity.None;
int dataBits = 8;

2. Create an instance of the class SerialPort

C#

SerialPort serial = new SerialPort(portName, baudRate, parity, dataBits);
serial.Encoding = Encoding.GetEncoding("iso-8859-1");

3. Open the port

C#

serial.Open();

4. Write data

C#

serial.WriteLine("Hello World");
or
serial.Write(new byte[] {0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64});

5. Read data

C#

string retVal = serial.ReadLine();  // Requires that the data is ended with a new line
or
byte[] buffer = new byte[serial.BytesToRead()];
int bytesRead = serial.Read(buffer, 0, buffer.Length);

You can also use the SerialPort.DataReceived Event (System.IO.Ports)[^] for reading bytes. This is useful for, for example, a barcode reader where data can be sent from the reader at any time.

That is the basics of serial communication.
Use MSDN and read the documentation: SerialPort Class (System.IO.Ports)[^]

As you don't explain what your goal is, it is difficult to give more help than this.

Posted 25-May-16 5:24am

George Jonsson

Comments

Matt T Heffron 25-May-16 15:41pm

+5

George Jonsson 25-May-16 18:27pm

Thanks Matt.

Member 12363094 25-May-16 23:42pm

but in my solution i am getting "object reference has not set " runtime exception
when i was writing serialport.write(s);
public static Boolean atCommandCheck()
{
String s1 = " ";
try
{
Port.writeln("AT");
//Thread.Sleep(1000);
s1 = Port.read();
}
catch(Exception e)
{
Console.WriteLine((new StringBuilder()).Append("Exception in atCommandCheck(AT Command Checking)..........").Append(e.Message).ToString());
s1="OK";
}
Console.WriteLine((new StringBuilder()).Append("AT..................").Append(s1).ToString());
return s1.IndexOf("OK") >= 0;
}
above one is in sms class i am calling writeln method from another class
public static void writeln(String s)
{
Serial1.Write(s);

}
in this case i was not able to write command to serial port

George Jonsson 26-May-16 0:17am

You can only have one instance of SerialPort for the same COM port at a time.
You seem to have two, port and serial. Why?

Member 12363094 26-May-16 0:36am

that Port is a class not serialport
in that writeln is method.
i have only one port that is serial1

George Jonsson 26-May-16 2:21am

And what is this?
port = new System.IO.Ports.SerialPort(comPort);
You have that in your original post.
And where does Port.writeln write to?

Member 12363094 26-May-16 4:18am

sorry i have removed that line
this is orginalcode with classes.
This is Main Class

namespace ConsoleApplication1
{
public class Main
{

public static int BURD_RATE;
public static int DATABITS;
public static int STOPBITS;
public static String comPort = "";

public Main()
{
BURD_RATE = 9600;
DATABITS = 8;
STOPBITS = 1;
comPort = "COM3";
}

public void initializeModem()
{
Boolean modemStatus = false;
try
{
Port.open(BURD_RATE, DATABITS, STOPBITS, comPort);
do
{
if(modemStatus)
{
break;
}
modemStatus = SmsUtil.initializeModem();
if(!modemStatus)
{
Console.WriteLine("AT Command is not responding. So going to reconnect the port once again.\n");
if (Port.Serial1 != null)
{
Port.close();
}
Port.open(19200, 8, 1, "COM1");
}
} while(true);
Port.isReading = true;

// ReadSMS readSMS = new ReadSMS();
// readSMS.readSMS();
}
catch(Exception e)
{
try
{
if (Port.Serial1 != null)
{
Port.close();
}
}
catch(Exception ex)
{
Console.WriteLine("Exception:"+ex);
}
}
}

public static void main(String[] args)
{
Main main = new Main();
main.initializeModem();
}
}
2.This is Port Class

class Port
{

public static Boolean isReading = false;
public static Boolean isSending = false;
public static SerialPort Serial1;
public static string s;
public Port()
{

}

public static void open(int boardRates, int dataBits, int stopBits, String comPort)
{
try
{

Console.WriteLine("Trying to open port...");

SerialPort Serial1 = new System.IO.Ports.SerialPort(comPort, boardRates, Parity.None, dataBits);
Serial1 = new System.IO.Ports.SerialPort(comPort);
Serial1.Open();
Serial1.Encoding = Encoding.GetEncoding("iso-8859-1");

Console.WriteLine("Port is opened successfully..... \n");
// Thread.Sleep(10000);
}
catch (Exception e)
{
Console.WriteLine((new StringBuilder()).Append("could not open port:").Append(e).Append(" ").Append(comPort).ToString());
//System.Exit(0);
}
}

public static String sendAT(String atcommand)
{

try
{
Thread.Sleep(500);
writeln(atcommand);
Thread.Sleep(500);
s = read();
Thread.Sleep(500);
}
catch(Exception e)
{
}
return s;
}

public static void write(string s)

{
Serial1.Write(s);
// Serial1.Flush();
}

public static void write(char[] s)
{
Serial1.Write(s,0,13);
// Sout.Flush();
}

public static void writeln(string s)
{
Console.WriteLine(s);
Serial1.WriteLine(s);
// Serial1.Write(13);
// Sout.Flush();

}

public static string read()
{
// Requires that the data is en

Member 12363094 26-May-16 4:20am

getting exception like "object has not sent for instance"

George Jonsson 26-May-16 6:30am

1- Please don't dump your code in the comment section. Improve your original question instead. No one will take the time to read the code like this.
2. Also point out the line where the exception occurs.