Question

以下代码如何运作？它给出了我想要的答案。但我想知道它是如何工作的？

public static void ShutDownComputer()
    {
        ManagementBaseObject outParameter = null;
        ManagementClass sysOs = new ManagementClass("Win32_OperatingSystem");
        sysOs.Get();
        sysOs.Scope.Options.EnablePrivileges = true;
        ManagementBaseObject inParameter = sysOs.GetMethodParameters("Win32Shutdown");
        inParameter["Flags"] = "8";
        inParameter["Reserved"] = "0";
        foreach (ManagementObject maObj in sysOs.GetInstances())
        {
            outParameter = maObj.InvokeMethod("Win32Shutdown", inParameter, null);
        }
    }

Answer 1

正在使用Windows Management Instrumentation (WMI)来调用Win32Shutdown方法。

// Creates a class which represents the model of the OS:
ManagementClass sysOs = new ManagementClass("Win32_OperatingSystem");

// Binds the class to the management object
sysOs.Get();

// Enables user priveledges for the connection, this is required to perform actions like shutdown
sysOs.Scope.Options.EnablePriviledges = true;

// Set the flag to indicate a "Power Off" (see the method link above for others)
inParameter["Flags"] = "8";

// According to MSDN the "Reserved" parameter is ignored hence its just being set to 0
inParameter["Reserved"] = "0";

// iteratve over all instances of the management object (which would be one in your case)
// and invoke the "Win32Shutdown" command using the parameters specified above.
foreach (ManagementObject maObj in sysOs.GetInstances())             
{             
    outParameter = maObj.InvokeMethod("Win32Shutdown", inParameter, null);             
}

Answer 2

您正在使用.net托管对象与WMI subsystem of windows进行互动，特别是Win32_OperatingSystem类的Win32Shutdown方法。

Answer 3

如果您使用Win32 API“InitiateSystemShutdownEx”，您将更容易理解正在发生的事情。这是一个C / C ++ API，因此您需要将其“导入”到C＃中，如下所示：http://www.pinvoke.net/default.aspx/advapi32/InitiateSystemShutdownEx.html

这是如何运作的？它给出了答案，但我不理解。

3 个答案: