等待调用外部程序执行完毕

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 ****************