PdhOpenQuery (VB)
The Visual
Basic PdhOpenQuery
function creates and initializes a unique query structure that is used to
manage the collection of performance data.
PdhOpenQuery(
|
ByRef QueryHandle as Long) |
|
|
as Long |
|
Parameters
QueryHandle
A variable
that is cleared (equals 0) before the function is called and, if the function
is successful, contains the unique ID of the query that is created and opened.
This handle is used in the subsequent calls to other PDH functions to identify
the query.
Return Values
If the
function succeeds, it returns a Long integer equal to ERROR_SUCCESS and
a new handle in the QueryHandle variable.
If the
function fails, the return value is a PDH error status defined in PDHDEFS.TXT.
The following are possible error values:
PDH_INVALID_ARGUMENT
The argument
is invalid or incorrect.
PDH_MEMORY_ALLOCATION_FAILURE
A temporary
memory buffer could not be allocated.