Edit

EVT_QUERY_FLAGS enumeration (winevt.h)

  • Article

Defines the values that specify how to return the query results and whether you are query against a channel or log file.

Syntax

typedef enum _EVT_QUERY_FLAGS {
  EvtQueryChannelPath = 0x1,
  EvtQueryFilePath = 0x2,
  EvtQueryForwardDirection = 0x100,
  EvtQueryReverseDirection = 0x200,
  EvtQueryTolerateQueryErrors = 0x1000
} EVT_QUERY_FLAGS;

Constants

 
EvtQueryChannelPath
Value: 0x1
Specifies that the query is against one or more channels. The Path parameter of the EvtQuery function must specify the name of a channel or NULL.
EvtQueryFilePath
Value: 0x2
Specifies that the query is against one or more log files. The Path parameter of the EvtQuery function must specify the full path to a log file or NULL.
EvtQueryForwardDirection
Value: 0x100
Specifies that the events in the query result are ordered from oldest to newest. This is the default.
EvtQueryReverseDirection
Value: 0x200
Specifies that the events in the query result are ordered from newest to oldest.
EvtQueryTolerateQueryErrors
Value: 0x1000
Specifies that EvtQuery should run the query even if the part of the query generates an error (is not well formed). The service validates the syntax of the XPath query to determine if it is well formed. If the validation fails, the service parses the XPath into individual expressions. It builds a new XPath beginning with the left most expression. The service validates the expression and if it is valid, the service adds the next expression to the XPath. The service repeats this process until it finds the expression that is failing. It then uses the valid expressions that it found beginning with the leftmost expression as the XPath query (which means that you may not get the events that you expected). If no part of the XPath is valid, the EvtQuery call fails.

Remarks

The EvtQueryChannelPath and EvtQueryFilePath flags are mutually exclusive. The EvtQueryForwardDirection and EvtQueryReverseDirection flags are also mutually exclusive.

You can retrieve events only in a forward direction from Debug and Analytic channels and from .evt and .etl log files.

Requirements

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

See also

EvtQuery