hi evry one, i write a code(vs 2003,ver 1.1) for listing all the com ports available in a system.Now i want to know which of these com ports are connected to a device,and which one is available.
i wrote a dll in vc++ and done it. thnx
hi evry one, i write a code(vs 2003,ver 1.1) for listing all the com ports available in a system.Now i want to know which of these com ports are connected to a device,and which one is available.
i wrote a dll in vc++ and done it. thnx
Try opening each port. If you can't open it (or an exception is thrown) the port is not available. If you can open it, it is available.
This is going to be a tough one.
Serial communications are just send/receive wires, they aren't negotiated connections like TCP.
You can open a connection (using System.IO.Ports) to a port that has no connected device.
You can also open a connection and write to it all day using different baud rates, etc., and you may never get a response back, even if there is a connected device.
All that said, you can get a list of serial ports (not including USB ports) on the machine using the code below, but it will tell you nothing about whether or not there is a device connected to them:
foreach (string s in SerialPort.GetPortNames()) {
Console.WriteLine("{0}", s);
}