__PARAMETERS class
The __PARAMETERS system class is an abstract class that defines the input and output parameters for methods. It is also used to pass input and output parameter values between a WMI client and a method provider.
The following syntax is simplified from Managed Object Format (MOF) code and includes all inherited properties. Properties are listed in alphabetic order, not MOF order.
Syntax
[abstract]
class __PARAMETERS
{
};
Members
The __PARAMETERS class does not define any members.
Remarks
To define a method in a user class, a WMI client creates a copy of the __PARAMETERS class, and adds a property for each input parameter in a method. If the method contains a return value or output parameters, another copy of __PARAMETERS must be created. If the method returns a return value, the client must add a property named ReturnValue. The method provider then stores the method parameters with a call to IWbemClassObject::PutMethod.
To invoke a method, a client calls the following in sequence:
- IWbemClassObject::GetMethod to retrieve a copy of the __PARAMETERS class that is stored by IWbemClassObject::PutMethod.
- IWbemClassObject::SpawnInstance, and then sets one property for each input parameter to the method.
- IWbemServices::ExecMethod or IWbemServices::ExecMethodAsync to execute the method.
After the method is finished executing, another __PARAMETERS class instance may be returned if the method has output parameters or a return value.
- If the method was invoked by using IWbemServices::ExecMethod, the __PARAMETERS instance is returned as an output argument.
- If the method was invoked by using IWbemServices::ExecMethodAsync, the __PARAMETERS instance is returned as a parameter to IWbemObjectSink::Indicate.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista |
| Minimum supported server |
Windows Server 2008 |
| Namespace |
All WMI namespaces |