Запуск процесса и ожидание его окончания

Источник: codingclub

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 примерно так:

 

Dim i As Long
Dim strCMD As String
strCMD = "Полный путь к программе"
i = ExecCmd(strCMD, 6) ′В значке и без фокуса
′Анализ того как все прошло
If i <> 0 Then ′
MsgBox "Произошла ошибка при выполнении команды:" & vbCrLf & _
strCMD, vbCritical, "Внешнее приложение"
End If

′===================================
′es 20.01.04
′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$, Optional WindowStyle& = 4) As Long
′Опции по WindowStyle$:
′ 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* - 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


Страница сайта http://www.interface.ru
Оригинал находится по адресу http://www.interface.ru/home.asp?artId=16366