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Запуск процесса (Приложения) и ожидание окончания его работы

Иногда возникает необходимость запустить внешнюю программу, для этого существует функция Shell, но у этой функции есть один недостаток - она передает управление в вызвавшую ее программу , не дождавшись того, когда будет выполнена запушенная задача.
Как быть? - Вставляем в модуль нижеследующие строки и используем функцию ExecCmd:

Option Compare Database
Option Explicit
'--------------------------------------------------------------------
' Module    : modExecCmd
' Author    : es
' Date      : 20.01.04
' Purpose   : Запуск процесса и ожидание его окончания
'--------------------------------------------------------------------
'API функции на тему ExecCmd с небольшой правкой взяты из MSDN ID:Q129796
'--------------------------------------------------------------------
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 String, 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 String, _
   lpStartupInfo As STARTUPINFO, lpProcessInformation As _
   PROCESS_INFORMATION) As Long

Private Declare Function CloseHandle Lib "kernel32" _
   (ByVal hObject As Long) As Long

Private Declare Function GetExitCodeProcess Lib "kernel32" _
   (ByVal hProcess As Long, lpExitCode As Long) As Long

Private Const STARTF_USESHOWWINDOW& = &H1
Private Const NORMAL_PRIORITY_CLASS = &H20&
Private Const INFINITE = -1&
'--------------------------------------------------------------------
Public Function ExecCmd(cmdline$, Optional WindowStyle& = 4) As Long
'es 20.01.04
'--------------------------------------------------------------------
'Опции по WindowStyle:
'   0 - Window is hidden and focus is passed to the hidden window.
'   1 - Window has focus and is restored to its original size and position.
'   2 - Window is displayed as an icon with focus.
'   3 - Window is maximized with focus.
'   4* - (тут по умолчанию) Window is restored to its most recent size and position. The currently active window remains active.
'   6 - Window is displayed as an icon. The currently active window remains active.
'--------------------------------------------------------------------
Dim proc As PROCESS_INFORMATION
Dim start As STARTUPINFO
Dim ret As Long
' Initialize the STARTUPINFO structure:
    With start
        .cb = Len(start)
        .dwFlags = STARTF_USESHOWWINDOW
        .wShowWindow = WindowStyle
    End With

' Start the shelled application:
    ret = CreateProcessA(vbNullString, cmdline$, 0&, 0&, 1&, _
    NORMAL_PRIORITY_CLASS, 0&, vbNullString, start, proc)

' Wait for the shelled application to finish:
    ret = WaitForSingleObject(proc.hProcess, INFINITE)
    Call GetExitCodeProcess(proc.hProcess, ret&)
    Call CloseHandle(proc.hThread)
    Call CloseHandle(proc.hProcess)
    ExecCmd = ret
End Function




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L.E. 21.05.2017
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