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IoWMIAllocateInstanceIds function (wdm.h)

  • Article

The IoWMIAllocateInstanceIds routine allocates one or more instance IDs that are unique to the GUID.

Syntax

NTSTATUS IoWMIAllocateInstanceIds(
  [in]  LPCGUID Guid,
  [in]  ULONG   InstanceCount,
  [out] ULONG   *FirstInstanceId
);

Parameters

[in] Guid

Pointer to the GUID for which to generate instance identifiers.

[in] InstanceCount

Specifies how many instance identifiers should be provided.

[out] FirstInstanceId

Pointer to the first instance identifier that the driver should use.

Return value

IoWMIAllocateInstanceIds returns a status code from the following list:

Return code Description
STATUS_SUCCESS
 Indicates that WMI successfully provided unique instance identifiers for the GUID specified.
STATUS_UNSUCCESSFUL
 Indicates that the WMI services are not available.
STATUS_INSUFFICIENT_RESOURCES
 Indicates that insufficient resources were available to provide the caller with instance IDs.

Remarks

If greater than one instance was requested in InstanceCount and the routine completed successfully, FirstInstanceId points to the first instance that the caller should use. For each instance requested beyond one, the caller should increment the value returned in *FirstInstanceId. For example, if the caller requested six instances and one was returned as the value of FirstInstanceId, the caller should use the values 1-6 as his unique instance identifiers.

Requirements

Requirement Value
Minimum supported client Available starting with Windows 2000.
Target Platform Universal
Header wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL PASSIVE_LEVEL
DDI compliance rules HwStorPortProhibitedDDIs(storport), IrqlIoPassive5(wdm), PowerIrpDDis(wdm), SpNoWait(storport), StorPortStartIo(storport)

See also

IoWmiSuggestInstanceName