display valid com port on C#

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hi i want to connect via serial port to a hardware. i need to know which comports is valid. for example, i have just comport3! i want to select this. what shall i do?

Posted 18-Nov-13 20:20pm

mohsenvasefi

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agent_kruger 19-Nov-13 6:04am

what do you need the serial port for? sending messages through GSM or something Like that?

mohsenvasefi 20-Nov-13 3:33am

yes, send special data to Microcontroller

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LOUIS Christian · Answer 1 · 2013-11-18T20:38:00

Hi,
Read this article :
http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.getportnames(v=vs.110).aspx
But you must give more precision about "Valid" COM port.
This is depending of your hardware.
Generally I do this :
- Open COM port
- send a message to get the serial number for example and wait the response.
- if a good response, hardware is detected
- close COM Port if necessary

Best regards

Sergey Alexandrovich Kryukov · Answer 2 · 2013-11-18T20:26:00

You can use WMI (System.Management): http://msdn.microsoft.com/en-us/library/system.management%28v=vs.110%29.aspx[^].

It could be something like http://stackoverflow.com/questions/1081871/how-to-find-available-com-ports[^].

[EDIT]

mohsenvasefi wrote:
I need to put these comports on a combobox and then select one of them for connect to hardware.

Sure. I described appropriate technique here: combobox.selectedvalue shows {} in winform[^].

The idea is: instead of putting just the COM port names to the combo box list, you can put the instances of some type carrying all the data needed for your hardware communications, and make each list item showing COM port names by overriding System.Object.ToString(), as shown in the code sample referenced above.

—SA

keerth516 · Answer 3 · 2013-11-18T22:46:00

If your are using Serial Port class then you can use the below method to get the comports available

C#

using System.IO.Ports; // include the namespace

SerialPort sp=new SerialPort(string portName,int baudRate,Parity parity,int dataBits,StopBits stopBits); //set your device baudrate,parity,stopbits bit to talk with the device.

sp.Open(); // open a serial port connection
string[] arr=Serialport.GetPortNames();
foreach(var item in arr)
{
Combobox1.Items.Add(item); //suppose Combobox1 is yours required combobox name
}
//once you access the comport that hardware connected,do sending a commands or what you want once its done 
sp.Close(); //close the serial port connection

In Serial port class,GetPortNames() will fetch all the com ports of PC

GetPortNames -Gets an array of serial port names for the current computer.

Hope this will help you.

display valid com port on C#

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