User`s guide

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Query Host Update—Function 24
This function determines if the presentation space, Operator Information Area (OIA), or both, of the
specified Host session have been updated since one of the following occurs:
u Start Host Notification (function 23) was called.
u The previous call of this function.
Prerequisite Functions
Start Host Notification (function 23).
WinHLLAPI(QUERYHOSTUPDATE,lpbyString,lpwLength,
lpwReturnnCode)
Parameter Description
Data String
Short name session ID of the desired Host session, or space or
null for the current Host session.
Data Length NA (length of 1 is implied).
PS Position NA
Code Description
WHLLOK No updates.
WHLLNOTCONNECTED The Host session specified is invalid.
WHLLNOTAVAILABLE
Start Host Notification (function 23) has not been called prior
to this function for the specified Host session.
WHLLSYSERROR The function failed due to a system error.
WHLLOIAUPDATE One or more updates to the OIA of the specified Host session.
WHLLPSUPDATE
One or more updates to the presentation space of the specified
Host session.
WHLLBOTHUPDATE One or more updates to both the OIA and the presentation
space of the specified Host session.
Function Call
Call Parameters
Return Codes