SpawnDerivedClass function

Artikkeli
09/15/2021

Creates a newly derived class object from a specified object.

Note

This API is for internal use only. It's not intended for use from developer code.

Syntax

HRESULT SpawnDerivedClass (
   [in] int                  vFunc,
   [in] IWbemClassObject*    ptr,
   [in] LONG                 lFlags,
   [out] IWbemClassObject**  ppNewClass);

Parameters

vFunc
[in] This parameter is unused.

ptr
[in] A pointer to an IWbemClassObject instance.

lFlags
[in] Reserved. This parameter must be 0.

ppNewClass
[out] Receives the pointer to the new class definition object. If an error occurs, a new object is not returned, and ppNewClass is left unmodified. Its value cannot be null.

Return value

The following values returned by this function are defined in the WbemCli.h header file, or you can define them as constants in your code:

Constant	Value	Description
`WBEM_E_FAILED`	0x80041001	There has been a general failure.
`WBEM_E_INVALID_OPERATION`	0x80041016	An invalid operation, such as spawning a class from an instance, was requested.
`WBEM_E_INCOMPLETE_CLASS`		The source class was not completely defined or registered with Windows Management, so a new derived class is not permitted.
`WBEM_E_OUT_OF_MEMORY`	0x80041006	Not enough memory is available to complete the operation.
`WBEM_E_INVALID_PARAMETER`	0x80041008	`ppNewClass` is `null`.
`WBEM_S_NO_ERROR`	0	The function call was successful.

Remarks

This function wraps a call to the IWbemClassObject::SpawnDerivedClass method.

ptr must be a class definition that becomes the parent class of the spawned object. The returned object becomes a subclass of the current object.

The new object returned in ppNewClass automatically becomes a subclass of the current object. This behavior cannot be overridden. There is no other method by which subclasses (derived classes) can be created.

Requirements

Platforms: See System Requirements.

Header: WMINet_Utils.idl

.NET Framework Versions: Available since 4.7.2

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