uscmd (USHORT)
Defines the criteria by which the string specified by the pszSearchString parameter is to be compared with the text of the items, to determine the index of the first matching item.
These values can be combined using the logical-OR operator:
LSS_CASESENSITIVE
This value is mandatory.
If this value is specified, LSS_SUBSTRING must not be specified.
If this value is specified, LSS_PREFIX must not be specified.
sItemStart (SHORT)
LIT_FIRST
pszSearchString (PSZ)
This points to the string to search for.
sItemMatched (SHORT)
LIT_ERROR