how to change known COM port to COM1 automatically in C# codeing?

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Hi, I have problem in my program. my program know COM ports but i want to write a code to choose COM1 automatically...
please help me.

Posted 1-Sep-12 19:38pm

saber_ordv9

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Mehdi Gholam · Answer 1 · 2012-09-01T19:49:00

Solution 1

Usually people don't know what they want and have to discover it, in your case :

C#

System.IO.Ports.SerialPort ComPort1 = new System.IO.Ports.SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);

Posted 1-Sep-12 19:49pm

Mehdi Gholam

Comments

Madhuri Gamane 16-Jun-15 3:20am

how it will change com 17 to com 1 ?? for installed driver ??

Mehdi Gholam 16-Jun-15 7:29am

Use "Com17"

Madhuri Gamane 16-Jun-15 8:36am

can u help me ??
i think your ans can help me...

this is my functions for com ports
[DllImport("MSPorts.dll")]
public static extern Int16 ComDBOpen(ref UInt32 PHCOMDB);

[DllImport("MSPorts.dll")]
public static extern long ComDBClose(UInt32 PHCOMDB);

[DllImport("MSPorts.dll")]
public static extern long ComDBReleasePort(UInt32 PHCOMDB,int ComNumber);

ManagementObjectCollection mReturn;
ManagementObjectSearcher mSearch;
mSearch = new ManagementObjectSearcher("Select * from Win32_SerialPort where name like '%MyDevice%' ");
mReturn = mSearch.Get();

string com = "";
string str1 = "";

foreach (ManagementObject mObj in mReturn)
{
str1 = mObj["Name"].ToString();
com = mObj["DeviceID"].ToString();
}

Int16 idsfdf1 = ComDBOpen(ref PHCOMDB);
long lng1 = ComDBReleasePort(PHCOMDB, 3); // if com3 is busy release it as // i want com port 3
long dsfdf1 = ComDBClose(PHCOMDB);

_serialPort = new SerialPort("COM17", 9600, Parity.None, 8, StopBits.One); // want // to transfer com 17 to com 3

now com should return com3
mSearch = new ManagementObjectSearcher("Select * from Win32_SerialPort where name like '%MyDevice%'");
mReturn = mSearch.Get();
foreach (ManagementObject mObj in mReturn)
{
str1 = mObj["Name"].ToString();
com = mObj["DeviceID"].ToString();
}

am i wrong somewhere ??

ridoy · Answer 2 · 2012-09-01T21:00:00

Solution 2

Change COM port name to COM1 automatically[^]
http://stackoverflow.com/questions/2002890/change-com-port-via-registry-command-line-or-software[^]

Posted 1-Sep-12 21:00pm

ridoy