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INetDiagHelper::LowHealth method (ndhelper.h)

  • Article

The LowHealth method enables the Helper Class Extension to check whether the component being diagnosed is healthy.

Syntax

HRESULT LowHealth(
  [in]  LPCWSTR          pwszInstanceDescription,
  [out] LPWSTR           *ppwszDescription,
  [out] long             *pDeferredTime,
  [out] DIAGNOSIS_STATUS *pStatus
);

Parameters

[in] pwszInstanceDescription

A pointer to a null-terminated string containing the user-friendly description of the information being diagnosed. For example, if a class were to diagnosis a connectivity issue with an IP address, the pwszInstanceDescription parameter would contain the host name.

[out] ppwszDescription

A pointer to a null-terminated string containing the description of the issue found if the component is found to be unhealthy.

[out] pDeferredTime

A pointer to the time, in seconds, to be deferred if the diagnosis cannot be started immediately. This is used when the pStatus parameter is set to DS_DEFERRED.

[out] pStatus

A pointer to the DIAGNOSIS_STATUS that is returned from the diagnosis.

Return value

Return code Description
S_OK
 The operation succeeded.
E_OUTOFMEMORY
 There is not enough memory available to complete this operation.
E_INVALIDARG
 One or more parameters has not been provided correctly.
E_ACCESSDENIED
 The caller does not have sufficient privileges to perform the diagnosis or repair operation.
E_ABORT
 The diagnosis or repair operation has been canceled.
 

Helper Class Extensions may return HRESULTS that are specific to the failures encountered in the function.

Remarks

The LowHealth method is required when building a Helper Class Extension.

If LowHealth returns DS_CONFIRMED, ppwszDescription will also contain a user-friendly description of the diagnosis result. The out parameter pDeferredTime contains the number of seconds this diagnosis needs to be deferred if pStatus returns DS_DEFERRED.

When LowHealth is confirmed, it may also optionally generate hypotheses in the GetLowerHypotheses method for other helper classes if the problem may be caused by other components. If not confirmed, NDF may further diagnose the problem by calling HighUtilization.

LowHealth may also return DS_INDETERMINATE if it is unable to diagnose the problem, but cannot confirm that the component is healthy. In this case, NDF will treat it as DS_CONFIRMED if none of the other hypotheses are confirmed.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header ndhelper.h

See also

INetDiagHelper