WMI Windows 7 64bit problem

string searchQuery = "SELECT * FROM Win32_Printer";

                ManagementObjectSearcher searchPrinters = new ManagementObjectSearcher("root\\CIMV2", searchQuery);

                ManagementObjectCollection printerCollection = searchPrinters.Get();

                foreach (ManagementObject printer in printerCollection)
                {
                    if (printer.Properties["Name"].Value.ToString() == pPrinterName)
                    {
                        switch (pMode)
                        {
                            case PrinterStatusMode.Pause:
                                printer.InvokeMethod("Pause", null);
                                break;
                            default:        //PrinterStatusMode.Resume
                                printer.InvokeMethod("Resume", null);
                                break;
                        }
                        retVal = true;
                        break;
                    }

                }

above could works fine on Windows XP, bit generates COMError on Windows 7 64bit.  How can I resolve this error?
raycclaytonAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Meir RivkinFull stack Software EngineerCommented:
which line throws the error?
0
raycclaytonAuthor Commented:
foreach (ManagementObject printer in printerCollection)

throws the error because I seem to have a bad count when I do this line:

ManagementObjectCollection printerCollection = searchPrinters.Get();
0
Meir RivkinFull stack Software EngineerCommented:
is searchPrinters.Get(); returns null?
0
CompTIA Cloud+

The CompTIA Cloud+ Basic training course will teach you about cloud concepts and models, data storage, networking, and network infrastructure.

raycclaytonAuthor Commented:
printerCollection is not null.

In debug the printerCollection has an error in the count

-            Count      'printerCollection.Count' threw an exception of type 'System.Management.ManagementException'      int {System.Management.ManagementException}
0
raycclaytonAuthor Commented:
I do have Microsoft.Office.Interops if that matters
0
Meir RivkinFull stack Software EngineerCommented:
put try/catch around the code and post the exception and inner exception if avbailable.
0
Meir RivkinFull stack Software EngineerCommented:
try this code:
ManagementScope scope = new ManagementScope(@"\\" + Environment.MachineName + @"\root\cimv2");
            scope.Connect();

            SelectQuery searchQuery = new SelectQuery("SELECT * FROM Win32_Printer");
            ManagementObjectSearcher searchPrinters = new ManagementObjectSearcher(scope, searchQuery);

            ManagementObjectCollection printerCollection = searchPrinters.Get();

            foreach (ManagementObject printer in printerCollection)
            {
                 if (printer.Properties["Name"].Value.ToString() == pPrinterName)
                    {
                        switch (pMode)
                        {
                            case PrinterStatusMode.Pause:
                                printer.InvokeMethod("Pause", null);
                                break;
                            default:        //PrinterStatusMode.Resume
                                printer.InvokeMethod("Resume", null);
                                break;
                        }
                        retVal = true;
                        break;
                    }

            }

Open in new window

0
raycclaytonAuthor Commented:
the above code will product this error:
'printerCollection.Count' threw an exception of type 'System.Runtime.InteropServices.COMException'

I have test the above code on another Windows 7 64bit PC and it works.  How can I repair the System.Runtime.InteropServices.  I think mine my be corrupt in some way.
0
raycclaytonAuthor Commented:
When I get the exception the errorcode is -2147023170
0
Meir RivkinFull stack Software EngineerCommented:
check what is the version of System.Runtime.InteropServices dll?
0
raycclaytonAuthor Commented:
I went into the WMI management and after that the errors went away.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
raycclaytonAuthor Commented:
it worked
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
.NET Programming

From novice to tech pro — start learning today.