等待调用外部程序执行完毕
时 间:2007-10-15 13:36:04
作 者:不详 ID:70 城市:闵行
摘 要:等待调用外部程序执行完毕
正 文:
等待调用外部程序执行完毕
问): 当我在程序调用外部程序时,ACCESS似乎不会等待外部程序执行完毕就会执行下一条VBA语句。那么,我怎样才能使我的程序等待执行完调用外部程序后才能执行下一条VBA语句呢?
(答): 将下列代码粘贴到一个新模块中,并使用ShellWait过程调用外部程序。
'***************** Code Start ******************
'This code was originally written by Terry Kreft.
'It is not to be altered or distributed,
'except as part of an application.
'You are free to use it in any application,
'provided the copyright notice is left unchanged.
'
'Code Courtesy of
'Terry Kreft
Private Const STARTF_USESHOWWINDOW& = &H1
Private Const NORMAL_PRIORITY_CLASS = &H20&
Private Const INFINITE = -1&
Private Type STARTUPINFO
cb As Long
lpReserved As String
lpDesktop As String
lpTitle As String
dwX As Long
dwY As Long
dwXSize As Long
dwYSize As Long
dwXCountChars As Long
dwYCountChars As Long
dwFillAttribute As Long
dwFlags As Long
wShowWindow As Integer
cbReserved2 As Integer
lpReserved2 As Long
hStdInput As Long
hStdOutput As Long
hStdError As Long
End Type
Private Type PROCESS_INFORMATION
hProcess As Long
hThread As Long
dwProcessID As Long
dwThreadID As Long
End Type
Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal _
hHandle As Long, ByVal dwMilliseconds As Long) As Long
Private Declare Function CreateProcessA Lib "kernel32" (ByVal _
lpApplicationName As Long, ByVal lpCommandLine As String, ByVal _
lpProcessAttributes As Long, ByVal lpThreadAttributes As Long, _
ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, _
ByVal lpEnvironment As Long, ByVal lpCurrentDirectory As Long, _
lpStartupInfo As STARTUPINFO, lpProcessInformation As _
PROCESS_INFORMATION) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal _
hObject As Long) As Long
Public Sub ShellWait(Pathname As String, Optional WindowStyle As Long)
Dim proc As PROCESS_INFORMATION
Dim start As STARTUPINFO
Dim ret As Long
' 初始化 STARTUPINFO 结构:
With start
.cb = Len(start)
If Not IsMissing(WindowStyle) Then
.dwFlags = STARTF_USESHOWWINDOW
.wShowWindow = WindowStyle
End If
End With
' 开始调用外部程序:
ret& = CreateProcessA(0&, Pathname, 0&, 0&, 1&, _
NORMAL_PRIORITY_CLASS, 0&, 0&, start, proc)
' 等待外部程序执行完毕:
ret& = WaitForSingleObject(proc.hProcess, INFINITE)
ret& = CloseHandle(proc.hProcess)
End Sub
'***************** Code End ****************
问): 当我在程序调用外部程序时,ACCESS似乎不会等待外部程序执行完毕就会执行下一条VBA语句。那么,我怎样才能使我的程序等待执行完调用外部程序后才能执行下一条VBA语句呢?
(答): 将下列代码粘贴到一个新模块中,并使用ShellWait过程调用外部程序。
'***************** Code Start ******************
'This code was originally written by Terry Kreft.
'It is not to be altered or distributed,
'except as part of an application.
'You are free to use it in any application,
'provided the copyright notice is left unchanged.
'
'Code Courtesy of
'Terry Kreft
Private Const STARTF_USESHOWWINDOW& = &H1
Private Const NORMAL_PRIORITY_CLASS = &H20&
Private Const INFINITE = -1&
Private Type STARTUPINFO
cb As Long
lpReserved As String
lpDesktop As String
lpTitle As String
dwX As Long
dwY As Long
dwXSize As Long
dwYSize As Long
dwXCountChars As Long
dwYCountChars As Long
dwFillAttribute As Long
dwFlags As Long
wShowWindow As Integer
cbReserved2 As Integer
lpReserved2 As Long
hStdInput As Long
hStdOutput As Long
hStdError As Long
End Type
Private Type PROCESS_INFORMATION
hProcess As Long
hThread As Long
dwProcessID As Long
dwThreadID As Long
End Type
Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal _
hHandle As Long, ByVal dwMilliseconds As Long) As Long
Private Declare Function CreateProcessA Lib "kernel32" (ByVal _
lpApplicationName As Long, ByVal lpCommandLine As String, ByVal _
lpProcessAttributes As Long, ByVal lpThreadAttributes As Long, _
ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, _
ByVal lpEnvironment As Long, ByVal lpCurrentDirectory As Long, _
lpStartupInfo As STARTUPINFO, lpProcessInformation As _
PROCESS_INFORMATION) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal _
hObject As Long) As Long
Public Sub ShellWait(Pathname As String, Optional WindowStyle As Long)
Dim proc As PROCESS_INFORMATION
Dim start As STARTUPINFO
Dim ret As Long
' 初始化 STARTUPINFO 结构:
With start
.cb = Len(start)
If Not IsMissing(WindowStyle) Then
.dwFlags = STARTF_USESHOWWINDOW
.wShowWindow = WindowStyle
End If
End With
' 开始调用外部程序:
ret& = CreateProcessA(0&, Pathname, 0&, 0&, 1&, _
NORMAL_PRIORITY_CLASS, 0&, 0&, start, proc)
' 等待外部程序执行完毕:
ret& = WaitForSingleObject(proc.hProcess, INFINITE)
ret& = CloseHandle(proc.hProcess)
End Sub
'***************** Code End ****************
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