SWbemServices.GetAsync method

Makale
01/07/2021

The GetAsync method of the SWbemServices object retrieves an object, that is a class definition or an instance, based on the object path.

This method retrieves only objects from the namespace that is associated with the current SWbemServices object.

This method is called in the asynchronous mode. For more information, see Calling a Method.

For an explanation of this syntax, see Document Conventions for the Scripting API.

Syntax

SWbemServices.GetAsync( _
  ByVal objWbemSink, _
  [ ByVal strObjectPath ], _
  [ ByVal iFlags ], _
  [ ByVal objwbemNamedValueSet ], _
  [ ByVal objWbemAsyncContext ] _
)

Parameters

objWbemSink: Required. Object sink that gets objects asynchronously. Create a SWbemSink object to receive the objects.
strObjectPath [optional]: Path of the object that you want to retrieve. If this value is empty, the empty object that is returned can become a new class. For more information, see Describing the Location of a WMI Object.
iFlags [optional]: Integer that determines the behavior of the call. This parameter can accept the following values.
wbemFlagSendStatus (128 (0x80)): Causes asynchronous calls to send status updates to the OnProgress event handler for the object sink.
wbemFlagDontSendStatus (0 (0x0)): Prevents asynchronous calls from sending status updates to the OnProgress event handler for the object sink.
wbemFlagUseAmendedQualifiers (131072 (0x20000)): Causes WMI to return class amendment data with the base class definition. For more information, see Localizing WMI Class Information.

objwbemNamedValueSet [optional]

Typically, this value is undefined. Otherwise, this is an SWbemNamedValueSet object whose elements represent the context information that can be used by the provider that is servicing the request. A provider that supports or requires such information must document the recognized value names, data type of the value, allowed values, and semantics.

objWbemAsyncContext [optional]

An SWbemNamedValueSet object that returns to the object sink to identify the source of the original asynchronous call. Use this parameter if you are making multiple asynchronous calls using the same object sink. To use this parameter, create an SWbemNamedValueSet object and use the SWbemNamedValueSet.Add method to add a value that identifies the asynchronous call you are making. This SWbemNamedValueSet object is returned to the object sink and the source of the call can be extracted using the SWbemNamedValueSet.Item method. For more information, see Calling a Method.

Return value

This method does not return a value. If successful, the sink receives an OnObjectReady event when the object is available.

Error codes

After the completion of the GetAsync method, the Err object may contain one of the error codes in the following list.

wbemErrAccessDenied - 2147749891 (0x80041003): Current user does not have the permission to access the object.
wbemErrFailed - 2147749889 (0x80041001): Unspecified error.
wbemErrInvalidParameter - 2147749896 (0x80041008): A specified parameter is not valid.
wbemErrInvalidObjectPath - 2147749946 (0x8004103A): Specified path was not valid.
wbemErrNotFound - 2147749890 (0x80041002): Requested object could not be found.
wbemErrOutOfMemory - 2147749894 (0x80041006): Not enough memory to complete the operation.

Remarks

This call returns immediately. The requested object and status are returned to the caller through a callback delivered to the sink that is specified in objWbemSink. To process the object when it returns, create an objWbemSink.OnObjectReady, or an objWbemSink.OnCompleted event subroutine.

An asynchronous callback allows a non-authenticated user to provide data to the sink. This poses security risks to your scripts and applications. To eliminate the risks, use semisynchronous or synchronous communication. For more information, see Setting Security on an Asynchronous Call.

Requirements

Requirement	Value
Minimum supported client	Windows Vista
Minimum supported server	Windows Server 2008
Header	Wbemdisp.h
Type library	Wbemdisp.tlb
DLL	Wbemdisp.dll
CLSID	CLSID_SWbemServices
IID	IID_ISWbemServices

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