'延时函数
p = 1200
Do While p >= 0 And OncomFlag = False
p = p - 1
If MSC.InBufferCount = 9 Then
av = MSC.Input
OncomFlag = True
End If
Loop
请各大侠帮我一下,我现在的程序已经基本解决问题,是一台计算机同时控制10台电子秤同时工作,最远距离170米,但是采集数据的程序总不定时出现不响应现象,有做过给个提示!谢谢·
p = 1200
Do While p >= 0 And OncomFlag = False
p = p - 1
If MSC.InBufferCount = 9 Then
av = MSC.Input
OncomFlag = True
End If
Loop
请各大侠帮我一下,我现在的程序已经基本解决问题,是一台计算机同时控制10台电子秤同时工作,最远距离170米,但是采集数据的程序总不定时出现不响应现象,有做过给个提示!谢谢·
Do While p >= 0 And OncomFlag = False
p = p - 1
doevents
If MSC.InBufferCount = 9 Then
av = MSC.Input
OncomFlag = True
End If
Loop
这个循环的时候不响应其他的任何事件,只要你随便操作其他动作就会出现不响应很正常,所以你在中间加入doevents,暂时的释放控制给系统
dwLowDateTime As Long
dwHighDateTime As Long
End TypePrivate Const WAIT_ABANDONED& = &H80&
Private Const WAIT_ABANDONED_0& = &H80&
Private Const WAIT_FAILED& = -1&
Private Const WAIT_IO_COMPLETION& = &HC0&
Private Const WAIT_OBJECT_0& = 0
Private Const WAIT_OBJECT_1& = 1
Private Const WAIT_TIMEOUT& = &H102&
Private Const INFINITE = &HFFFF
Private Const ERROR_ALREADY_EXISTS = 183&
Private Const QS_HOTKEY& = &H80
Private Const QS_KEY& = &H1
Private Const QS_MOUSEBUTTON& = &H4
Private Const QS_MOUSEMOVE& = &H2
Private Const QS_PAINT& = &H20
Private Const QS_POSTMESSAGE& = &H8
Private Const QS_SENDMESSAGE& = &H40
Private Const QS_TIMER& = &H10
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 Const Units = 4294967296#
Private Const MAX_LONG = -2147483648#Private Declare Function CreateWaitableTimer Lib "kernel32" Alias "CreateWaitableTimerA" (ByVal lpSemaphoreAttributes As Long, ByVal bManualReset As Long, ByVal lpName As String) As Long
Private Declare Function OpenWaitableTimer Lib "kernel32" Alias "OpenWaitableTimerA" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal lpName As String) As Long
Private Declare Function SetWaitableTimer Lib "kernel32" (ByVal hTimer As Long, lpDueTime As FILETIME, ByVal lPeriod As Long, ByVal pfnCompletionRoutine As Long, ByVal lpArgToCompletionRoutine As Long, ByVal fResume As Long) As Long
Private Declare Function CancelWaitableTimer Lib "kernel32" (ByVal hTimer As Long)
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) 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 LongPrivate mlTimer As LongPrivate Sub Class_Terminate()
On Error Resume Next
If mlTimer <> 0 Then CloseHandle mlTimer
End SubPublic Sub Wait(MilliSeconds As Long)
On Error GoTo ErrHandler
Dim ft As FILETIME
Dim lBusy As Long
Dim lRet As Long
Dim dblDelay As Double
Dim dblDelayLow As Double mlTimer = CreateWaitableTimer(0, True, App.EXEName & "Timer" & Format$(Now(), "NNSS")) If Err.LastDllError <> ERROR_ALREADY_EXISTS Then
ft.dwLowDateTime = -1
ft.dwHighDateTime = -1
lRet = SetWaitableTimer(mlTimer, ft, 0, 0, 0, 0)
End If ' Convert the Units to nanoseconds.
dblDelay = CDbl(MilliSeconds) * 10000# ' By setting the high/low time to a negative number, it tells
' the Wait (in SetWaitableTimer) to use an offset time as
' opposed to a hardcoded time. If it were positive, it would
' try to convert the value to GMT.
ft.dwHighDateTime = -CLng(dblDelay / Units) - 1
dblDelayLow = -Units * (dblDelay / Units - Fix(CStr(dblDelay / Units))) If dblDelayLow < MAX_LONG Then dblDelayLow = Units + dblDelayLow ft.dwLowDateTime = CLng(dblDelayLow)
lRet = SetWaitableTimer(mlTimer, ft, 0, 0, 0, False) Do
' QS_ALLINPUT means that MsgWaitForMultipleObjects will
' return every time the thread in which it is running gets
' a message. If you wanted to handle messages in here you could,
' but by calling Doevents you are letting DefWindowProc
' do its normal windows message handling---Like DDE, etc.
lBusy = MsgWaitForMultipleObjects(1, mlTimer, False, INFINITE, QS_ALLINPUT&)
DoEvents
Loop Until lBusy = WAIT_OBJECT_0 ' Close the handles when you are done with them.
CloseHandle mlTimer
mlTimer = 0
Exit SubErrHandler:
Err.Raise Err.Number, Err.Source, "[clsWaitableTimer.Wait]" & Err.Description
End Sub
你的延时是毫秒级别的吗?不会出现sleep的中断进程一段时间吧!