the result of DefragAnalysis method in c#

[SAKRA]

hi guys... i have a problem with the defraganalysis method...

ManagementClass objMC = new ManagementClass("Win32_Volume");
ManagementObjectCollection objMOC = objMC.GetInstances();

foreach (ManagementObject objMO in objMOC)
{
int result = Convert.ToInt32(objMO.InvokeMethod("defraganalysis", new object[] { true }));

if(objMO["Name"].ToString().Equals("C:\\")) {
break;
}
}

this code works fine, i got the result number but how can i get the properties of the defraganalysis object? as you can see http://msdn.microsoft.com/en-us/library/aa389827(VS.85).aspx[^] ms sais:

uint32 DefragAnalysis(
[out] boolean DefragRecommended,
[out] object DefragAnalysis
);

yes, but how can i get the out parameters?? i've searched the whole internet, but i couldnt find the answer. thx a lot!

[musefan]

to use the out parameters it would be something like this:

bool recomend;
object analysis;

DefragAnalysis(out recomend, out analysis);

this would assign your local variables with data from within the function if this is not your requirement then im sorry for misunderstanding the question

[ChunkyStool]

Yeah, there's not much C# sample code for WMI anywhere -- including MSDN. That really sucks because WMI isn't very intuitive. I tested WMI for 8+ years and still struggle with some features... :wtf: The DefragAnalysis method returns 3 things: return code (which you got), a bool that indicates whether or not a defrag is recommended, and an instance of Win32_DefragAnalysis. The bool & instance get "wrapped" in an object array. All you have to do is tell the method where to put the objects. Think of the "outParams" array as a mailbox with 2 slots. Null values are fine. Here's some sample code. (Note, it isn't necessary to specify scope for Vista or Server 2008 because the defaults are local machine & “root\cimv2”. I only included it for backward compatibility.)

using System;
using System.Management;

namespace DefragAnalysis
{
class Program
{
static void Main(string[] args)
{
try
{
string scope = @"\\.\root\cimv2";
string query = @"SELECT * FROM Win32_Volume WHERE Name = 'C:\\'";
ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);
object[] outputArgs = new object[2];

            foreach (ManagementObject volume in searcher.Get())
            {
                UInt32 result = (UInt32)volume.InvokeMethod("DefragAnalysis", outputArgs);

                if (result == 0)
                {
                    Console.WriteLine("Defrag Needed = {0}\\n", outputArgs\[0\]);
                    ManagementBaseObject defragAnalysis = outputArgs\[1\] as ManagementBaseObject;

                    if (null != defragAnalysis)
                    {
                        foreach (PropertyData property in defragAnalysis.Properties)
                        {
                            Console.WriteLine("{0} = {1}", property.Name, property.Value);
                        }
                    }
                }
                else
                {
                    Console.WriteLine("Method return code = 0x{0:X}", result);
                }
            }
        }

        catch (Exception ex)
        {
            Console.WriteLine("Something bad happened.\\n" + ex);
        }

        finally
        {
            Console.WriteLine("\\npress any key to exit...");
            Console.ReadKey();
        }
    }