Win32_CompurterSystem: Rename, JoinDomainOrWorkgroup, UnjoinDomainOrWorkgroup - HELP

mcldev

In C#, using WMI has been great for access SI data. For reasons still unbeknownst to me, I cannot get a ManagementBaseObject instance (lets's call it mob) to properly invoke any of these function using InvokeMethod. For example:

mof = "Rename";
name = "NEWNAME";
password = "adminpw";
user = "administrator";

object[] args = new args[3];
args[0] = name;
args[1] = password;
args[1] = user;

ManagementBaseObject mob = new ManagementBaseObject();
long retval = (long) mob.InvokeMethod(mof, name, password, user);

if (retval == 0)
Console.Writeline("Reboot PC for RENAME to take effect");
else
Console.Writeline("RENAME error {0}");

Everytime I get Invalid Method Parameter(s) message. If anyone knows how to succcessfully call Rename, JoinDomainOrWorkgroup, etc from C#, please share the technique. Thanks

Uros Calakovic

There is a sample for InvokeMethod() here[^] and also here.[^] Frankly, I don't know how you managed to get to Invalid Method Parameter(s) with your code.

In January you said "Money in April" - That was two years ago! B. Python

mcldev

The examples on MSDN are for Win32_Process and they work when I test. For some reason, Win32_ComputerSystem is behaving differently. I think there must a different way of calling the Win32_ComputerSystem functions. Here is the exact code that yields this result every time! :wtf: Exception caught!!! System.Management: Invalid method Parameter(s)

   public bool RenameComputer(string name, string password, string user)
    {
        bool ok = true;
        string mofName = "Rename";

        try
        {
            //Get an input parameters object for this method
            ManagementClass processClass = new ManagementClass("Win32\_ComputerSystem");

            object\[\] methodArgs = { name, password, user};

            for (int i = 0; i < methodArgs.Length; ++i)
                Console.WriteLine("methodArgs\[{0}\] = {1}", i, methodArgs\[i\]);

            object retval = processClass.InvokeMethod(mofName, methodArgs);

            Console.WriteLine("InvokeMethod Status {0}, Process ID {1}", 
                retval, methodArgs\[3\]);
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception caught!!!");
            Console.WriteLine("{0}: {1}", e.Source, e.Message);
            ok = false;
        }
        return (ok);
    }

Has anyone been sucessful in calling Win32_ComputerSystem InvokeMethod() for Rename, or JoinDomainOrWorkgroup or UnjoinDomainOrWorkgroup. Help is greatly appreciated by me and anyone else dealing with this challenge.

Uros Calakovic

Win32_ComputerSystem.Rename is an instance method so you first need to get the Win32_ComputerSystem instance to invoke it on:

ManagementClass computerSystemClass =
new ManagementClass("Win32_ComputerSystem");

object[] methodArgs = { name, password, user };

foreach (ManagementObject computerSystem in computerSystemClass.GetInstances())
{
object retval = computerSystem.InvokeMethod(mofName, methodArgs);
}

computerSystemClass.GetInstances() will return only one instance but you still need to use foreach. To avoid it, you could use the ManagementObject constructor that accepts the object path to get the instance:

ManagementObject computerSystem =
new ManagementObject("Win32_ComputerSystem.Name='SomeName'");

but you would have to get the computer name that you want to change first.

In January you said "Money in April" - That was two years ago! B. Python

mcldev

Thanks!