MI-L Wait Function

[Robert Crossley]

Hi all,
Still having some trouble with a function on XP, and an associate 
suggested that the problem may be helped by pausing the program to allow 
?buffers to be flushed? before going onto the next operation (the exact 
description of the potential problem was on the assembly code side of 
where I am comfortable working).

Anyway, he suggested the sleep function does not help as there is a 
problem with sleep on XP, and I don't want to pause the execution of 
MapInfo, but rather just stop moving on until MapInfo had caught up.  The 
following VB code was given as an option, and while most of it is fairly 
easy to convert (eg. Private Const -> DEFINE), I am having trouble working 
out how to call the MsgWaitForMultipleObjects function.  It is failing in 
MapBasic as the define functions don't work with constants which use the 
Or in them (understandable as it just substitutes the text).  I am getting 
a compile error when calling

    If MsgWaitForMultipleObjects(0, 0, 0, timeRemaining, QS_ALLINPUT) > 0 
Then
    End If

Has anyone implemented this function in MapBasic? or is there an 
alternative?  I want to pause MapInfo from processing the next operation 
while allowing it to finish what it was doing.

r
Original VB code
Private Const QS_KEY = &H1
Private Const QS_MOUSEMOVE = &H2
Private Const QS_MOUSEBUTTON = &H4
Private Const QS_POSTMESSAGE = &H8
Private Const QS_TIMER = &H10
Private Const QS_PAINT = &H20
Private Const QS_SENDMESSAGE = &H40
Private Const QS_HOTKEY = &H80
Private Const QS_MOUSE = (QS_MOUSEMOVE Or QS_MOUSEBUTTON)
Private Const QS_INPUT = (QS_MOUSE Or QS_KEY)
Private Const QS_ALLEVENTS = (QS_INPUT Or QS_POSTMESSAGE Or QS_TIMER Or 
QS_PAINT Or QS_HOTKEY)
Private Const QS_ALLINPUT = (QS_SENDMESSAGE Or QS_PAINT Or QS_TIMER Or 
QS_POSTMESSAGE Or QS_MOUSEBUTTON Or QS_MOUSEMOVE Or QS_HOTKEY Or QS_KEY)

Private Declare Function GetTickCount Lib "kernel32" () As Long
Private Declare Function MsgWaitForMultipleObjects Lib "user32" (ByVal 
nCount As Long, pHandles As Long, ByVal fWaitAll As Long, ByVal 
dwMilliseconds As Long, ByVal dwWakeMask As Long) As Long

' *********************************************************
' * MsgWait
' *
' * Sleeps for a specified time but allows
' * events to process immediately
' *
' * Input: ms - milliseconds to wait
' * Output: none
' *********************************************************
Public Sub MsgWait(ByVal ms As Long)
  Dim start As Long, timeRemaining As Long, timeNow As Long
  start = GetTickCount()
  timeRemaining = ms
  Do
    ' Sleep until timeout or event occurs
    MsgWaitForMultipleObjects 0, 0, 0, timeRemaining, QS_ALLINPUT
    timeNow = GetTickCount()
    If timeNow - start >= timeRemaining Then
      Exit Sub
    ElseIf timeNow < start Then
      ' Handle GetTickCount 49.7 day wrap around
      start = timeNow
    End If
    timeRemaining = timeRemaining - (timeNow - start)
    start = timeNow
    DoEvents
  Loop
End Sub
Converted to Mapinfo
'DEFINES for the Wait function
DEFINE QS_KEY = &H1
DEFINE QS_MOUSEMOVE = &H2
DEFINE QS_MOUSEBUTTON = &H4
DEFINE QS_POSTMESSAGE = &H8
DEFINE  QS_TIMER = &H10
DEFINE  QS_PAINT = &H20
DEFINE  QS_SENDMESSAGE = &H40
DEFINE  QS_HOTKEY = &H80
DEFINE  QS_MOUSE = (QS_MOUSEMOVE Or QS_MOUSEBUTTON)
DEFINE  QS_INPUT = (QS_MOUSE Or QS_KEY)
DEFINE  QS_ALLEVENTS = (QS_INPUT Or QS_POSTMESSAGE Or QS_TIMER Or QS_PAINT 
Or QS_HOTKEY)
DEFINE  QS_ALLINPUT = (QS_SENDMESSAGE Or QS_PAINT Or QS_TIMER Or 
QS_POSTMESSAGE Or QS_MOUSEBUTTON Or QS_MOUSEMOVE Or QS_HOTKEY Or QS_KEY)

Sub MsgWait(ByVal ms As Integer)
'-----------------------
'Written By:    RC
'-----------------------
Dim start As Integer
Dim timeRemaining As Integer
Dim timeNow As Integer
'Set up general error handler
ONERROR GOTO ErrorHandler
Print "Waiting " + ms + " milliseconds."
  start = GetTickCount()
  timeRemaining = ms
  Do
    ' Sleep until timeout or event occurs
    If MsgWaitForMultipleObjects(0, 0, 0, timeRemaining, QS_ALLINPUT) > 0 
Then
    End If
    timeNow = GetTickCount()
    If timeNow - start >= timeRemaining Then
      Exit Sub
    ElseIf timeNow < start Then
      ' Handle GetTickCount 49.7 day wrap around
      start = timeNow
    End If
    timeRemaining = timeRemaining - (timeNow - start)
    start = timeNow
    'DoEvents
  Loop
EXIT SUB
ErrorHandler:
	CALL ErrorMessage("MsgWait")
END SUB 'ProForma

--
Robert Crossley
Agtrix P/L
9 Short St
PO Box 63
New Brighton 2483
Far Southern Queensland
AUSTRALIA
153.549004 E 28.517344 S
P: 02 6680 1309
F: New Connection
M: 0419 718 642
E: [EMAIL PROTECTED]
W: www.agtrix.com
W: www.wotzhere.com
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