CODEWITHSUNDEEP
c#comportsprinters
BakaMike75
BakaMike75

Reputation: 81

How to set a Printer Port in C# on a specified Printer

I want to be able to do the equivalent of the following in c#:

I have managed to get a ManagementObject for a named printer and tried to call:

mObj.SetPropertyValue("PortName","COM12:");

On the ManagementObject for that Printer - whch inherits from ManagementBaseObject.

However, this piece of code didn't do anything to the Printer Settings.

I suspect that I will need to use P/Invoke on the appropriate library but after a lot of searching I cannot find the library or a tutorial for how to do this from c#.

Any help would be much appreciated.

Upvotes: 3

Views: 4469

Answers (1)

BakaMike75
BakaMike75

Reputation: 81

Found the answer on an obscure part of the internet:

public static void SetPrinterPort(string printerName, string portName)
        {
            var oManagementScope = new ManagementScope(ManagementPath.DefaultPath);
            oManagementScope.Connect();

            SelectQuery oSelectQuery = new SelectQuery();
            oSelectQuery.QueryString = @"SELECT * FROM Win32_Printer 
            WHERE Name = '" + printerName.Replace("\\", "\\\\") + "'";

            ManagementObjectSearcher oObjectSearcher =
               new ManagementObjectSearcher(oManagementScope, @oSelectQuery);
            ManagementObjectCollection oObjectCollection = oObjectSearcher.Get();

            foreach (ManagementObject oItem in oObjectCollection)
            {
                oItem.Properties["PortName"].Value = portName;
                oItem.Put();
            }
        }

I am pretty sure that the last part is all you need to set properties on any Management Object. It was driving me nuts that I could see that the Win32 API said the property I wanted to set was read/write but nowhere seemed to have the code for setting it.

Well now we know! :-)

I hope this is useful for someone.

Upvotes: 5

Related Questions