CreateClassEnumWmi function

Artikkeli
09/15/2021

Returns an enumerator for all classes that satisfy the specified selection criteria.

Note

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

Syntax

HRESULT CreateClassEnumWmi (
   [in] BSTR                    strSuperclass,
   [in] long                    lFlags,
   [in] IWbemContext*           pCtx,
   [out] IEnumWbemClassObject** ppEnum,
   [in] DWORD                   authLevel,
   [in] DWORD                   impLevel,
   [in] IWbemServices*          pCurrentNamespace,
   [in] BSTR                    strUser,
   [in] BSTR                    strPassword,
   [in] BSTR                    strAuthority
);

Parameters

strSuperclass
[in] If not null or blank, specifies the name of a parent class; the enumerator returns only subclasses of this class. If it is null or blank and lFlags is WBEM_FLAG_SHALLOW, returns only top-level classes (classes with no parent class). If it is null or blank and lFlags is WBEM_FLAG_DEEP, returns all classes in the namespace.

lFlags
[in] A combination of flags that affect the behavior of this function. The following values are defined in the WbemCli.h header file, or you can define them as constants in your code:

Constant	Value	Description
`WBEM_FLAG_USE_AMENDED_QUALIFIERS`	0x20000	If set, the function retrieves the amended qualifiers stored in the localized namespace of the current connection's locale. If not set, the function retrieves only the qualifiers stored in the immediate namespace.
`WBEM_FLAG_DEEP`	0	The enumeration includes all subclasses in the hierarchy, but not this class.
`WBEM_FLAG_SHALLOW`	1	The enumeration includes only pure instances of this class and excludes all instances of subclasses that supply properties not found in this class.
`WBEM_FLAG_RETURN_IMMEDIATELY`	0x10	The flag causes a semisynchronous call.
`WBEM_FLAG_FORWARD_ONLY`	0x20	The function returns a forward-only enumerator. Typically, forward-only enumerators are faster and use less memory than conventional enumerators, but they do not allow calls to Clone.
`WBEM_FLAG_BIDIRECTIONAL`	0	WMI retains pointers to objects in the enumeration until they are released.

The recommended flags are WBEM_FLAG_RETURN_IMMEDIATELY and WBEM_FLAG_FORWARD_ONLY for best performance.

pCtx
[in] Typically, this value is null. Otherwise, it is a pointer to an IWbemContext instance that can be used by the provider that is providing the requested classes.

ppEnum
[out] Receives the pointer to the enumerator.

authLevel
[in] The authorization level.

impLevel
[in] The impersonation level.

pCurrentNamespace
[in] A pointer to an IWbemServices object that represents the current namespace.

strUser
[in] The user name. See the ConnectServerWmi function for more information.

strPassword
[in] The password. See the ConnectServerWmi function for more information.

strAuthority
[in] The domain name of the user. See the ConnectServerWmi function for more information.

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_ACCESS_DENIED`	0x80041003	The user does not have permission to view one or more of the classes that the function can return.
`WBEM_E_FAILED`	0x80041001	An unspecified error has occurred.
`WBEM_E_INVALID_CLASS`	0x80041010	`strSuperClass` does not exist.
`WBEM_E_INVALID_PARAMETER`	0x80041008	A parameter is not valid.
`WBEM_E_OUT_OF_MEMORY`	0x80041006	Not enough memory is available to complete the operation.
`WBEM_E_SHUTTING_DOWN`	0x80041033	WMI was probably stopped and restarting. Call ConnectServerWmi again.
`WBEM_E_TRANSPORT_FAILURE`	0x80041015	The remote procedure call (RPC) link between the current process and WMI has failed.
`WBEM_S_NO_ERROR`	0	The function call was successful.

Remarks

This function wraps a call to the IWbemServices::CreateClassEnum method.

If the function call fails, you can obtain additional error information by calling the GetErrorInfo function.

Requirements

Platforms: See System Requirements.

Header: WMINet_Utils.idl

.NET Framework Versions: Available since 4.7.2

Jaa