IWbemServices::PutClass method (wbemcli.h)

The IWbemServices::PutClass method creates a new class or updates an existing one. The class specified by the pObject parameter must have been correctly initialized with all of the required property values.

The user may not create classes with names that begin or end with an underscore (_). This is reserved for system classes.


  [in]  IWbemClassObject *pObject,
  [in]  long             lFlags,
  [in]  IWbemContext     *pCtx,
  [out] IWbemCallResult  **ppCallResult


[in] pObject

Must point to a valid class definition. The reference count is not changed.

[in] lFlags

The following flags affect the behavior of this method.


If this flag is set, WMI does not store any qualifiers with the amended flavor. If this flag is not set, it is assumed that this object is not localized, and all qualifiers are stored with this instance.


This flag causes the class to be created if it does not exist, or overwritten if it exists already.


This flag causes this call to update. The class must exist for the call to be successful.


This flag is used for creation only. The call fails if the class already exists.


This flag causes this to be a semisynchronous call. For more information, see Calling a Method.


Push providers must specify this flag when calling PutClass, to indicate that this class has changed.


This flag allows a class to be updated if there are no derived classes and there are no instances for that class. It also allows updates in all cases if the change is just to nonimportant qualifiers (for example, the Description qualifier). This is the default behavior for this call and is used for compatibility with previous versions of Windows Management. If the class has instances or changes are to important qualifiers, the update fails.


This flag allows updates of classes even if there are child classes as long as the change does not cause any conflicts with child classes. An example of an update this flag would allow would be to add a new property to the base class that was not previously mentioned in any of the child classes. If the class has instances, the update fails.


This flag forces updates of classes when conflicting child classes exist. An example of an update this flag would force would be if a class qualifier were defined in a child class, and the base class tried to add the same qualifier which conflicted with the existing one. In force mode, this conflict would be resolved by deleting the conflicting qualifier in the child class.

[in] pCtx

Typically NULL. Otherwise, this is a pointer to an IWbemContext object required by the dynamic class provider that is producing the class instances. The values in the context object must be specified in the documentation for the provider in question. For more information about this parameter, see Making Calls to WMI.

[out] ppCallResult

If NULL, this parameter is not used. If the lFlags parameter contains WBEM_FLAG_RETURN_IMMEDIATELY, this call returns immediately with WBEM_S_NO_ERROR. The ppCallResult parameter receives a pointer to a new IWbemCallResult object, which can then be polled to obtain the result using the IWbemCallResult::GetCallStatus method.

Return value

This method returns an HRESULT indicating the status of the method call. The following list lists the value contained within an HRESULT.

On failure, you can obtain any available information from the COM function GetErrorInfo.

COM-specific error codes also may be returned if network problems cause you to lose the remote connection to Windows Management.

Note  Unpredictable behavior will result if you change class definitions while they are in use by clients or providers. The IWbemServices::PutClass method should only be used to create or update a class when there are no clients or providers currently using the class.


Requirement Value
Minimum supported client Windows Vista
Minimum supported server Windows Server 2008
Target Platform Windows
Header wbemcli.h (include Wbemidl.h)
Library Wbemuuid.lib
DLL Fastprox.dll; Esscli.dll; FrameDyn.dll; FrameDynOS.dll; Ntevt.dll; Stdprov.dll; Viewprov.dll; Wbemcomn.dll; Wbemcore.dll; Wbemess.dll; Wbemsvc.dll; Wmipicmp.dll; Wmidcprv.dll; Wmipjobj.dll; Wmiprvsd.dll

See also

Creating a Class



Retrieving an Error Code