VB Shell调用后 等待程序运行结束

Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long

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

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



Const PROCESS_QUERY_INFORMATION = &H400

Const STILL_ALIVE = &H103

Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Private Declare Function GetExitCodeProcess Lib "kernel32" (ByVal hProcess As Long, lpExitCode As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Const PROCESS_QUERY_INFORMATION = &H400
Const STILL_ALIVE = &H103

Private Sub Command1_Click()

Dim pid As Long

pid = Shell("c:\a.bat", vbNormalFocus)

hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, 0, pid)

Do

Call GetExitCodeProcess(hProcess, ExitCode)

DoEvents

Loop While ExitCode = STILL_ALIVE

Call CloseHandle(hProcess)



MsgBox ("运行结束")

End Sub

Private Sub Command1_Click()
Dim pid As Long
pid = Shell("c:\a.bat", vbNormalFocus)
hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, 0, pid)
Do
Call GetExitCodeProcess(hProcess, ExitCode)
DoEvents
Loop While ExitCode = STILL_ALIVE
Call CloseHandle(hProcess)
MsgBox ("运行结束")
End Sub

 

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VB启动/结束另一程序(Shell 等待程序运行结束)
VB 中，常以Shell指令来执行外部程式，然而它在Create该外部process 后，立刻
就会回到vb 的下一行程式，无法做到等待该Process结束时，才执行下一行指令，
或是说，无法得知该Process是否已结束，甚者，该Process执行到一半，又该如何
中止其执行等等，这些都不是Shell指令所能控制的，因此我们需使API的帮助来完
成。

第一个问题，如何等待shell所Create的process结束后才往后执行vb的程式。
首先要知道的是，每个Process有唯一的一个ProcessID，这是OS给定的，用来
区别每个 Process，这个Process ID(PID)主要可用来取得该Process相对应的一些
资讯，然而要对该Process的控制，却大多透过 Process Handle(hProcess)。VB
Shell指令的传回值是PID，而非hProcess，所以我们需透过OpenProcess这个API来
取得 hProcess而OpenProcess()的第一个叁数，指的是所取得的hProcess所具有的
能力，像 PROCESS_QUERY_INFORMATION 便是让GetExitCode()可取得hProcess所指
的process之状态，而PROCESS_TERMINATE，便是让TerminateProcess(hProcess..)
的指令能够生效，也就是说，不同叁数设定，使hProcess所具有的权限、能力有所
不同。取得 hProcess后便可以使用WaitForSingleObject()来等待hProcess状态的
改变，也就是说，它会等待 hProcess所指的process执行完，这个指令才结束，它
第二个叁数所指的是 WaitForSingleObject()所要等待的时间(in milliseconds )
，如果超过所指的时间，就TimeOut而结束WaitForSingleObject()的等待。若要它
无限的等下去，就设定为INFIN99vE。

pid = Shell("C:\tools\spe3\pe2.exe", vbNormalFocus)
hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, 0, pid)
ExitEvent = WaitForSingleObject(hProcess, INFIN99vE)
Call CloseHandle(hProcess)

上例会无限等待shell指令create之process结束后，才再做后面的vb指令。有
时觉得那会等太久，所以有第二个解决方式：等process结束时再通知vb 就好，即
：设定一个公用变数(isDone)，当它变成True时代表Shell所Create的Process已结
束。当Process还在执行时，GetExitCodeProcess会传&H103给其第二个叁数，直到
结束时才传另外的数值，如果程式正常结束，那Exitcode = 0，否则就得看它如何
结束了。或许有人在其他地方看到 loop的地方是Loop while Exitcode ＜＞ 0，那
有一点危险，如果以这程子来看，您不是用F4来离开pe2而是用右上方 X 的结束
dos window那么，会因为ExitCode的值永远不会是0，而进入无穷的回圈。

Dim pid As Long
pid = Shell("C:\tools\spe3\pe2.exe", vbNormalFocus)
hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, 0, pid)
isDone = False
Do
Call GetExitCodeProcess(hProcess, ExitCode)
Debug.Print ExitCode
DoEvents
Loop While ExitCode = STILL_ALIVE
Call CloseHandle(hProcess)
isDone = True

另外，如果您的shell所Create的程式，有视窗且为立刻Focus者，可另外用以
下的方式Dim pid As Long
Dim hwnd5 As Long
pid = Shell("c:\tools\spe3\pe2.exe", vbNormalFocus)
hwnd5 = GetForegroundWindow()
isDone = False
Do While IsWindow(hwnd5)
DoEvents
Loop
isDone = True



而如何强迫shell所Create的process结束呢，那便是
Dim aa As Long
If hProcess <> 0 Then
aa = TerminateProcess(hProcess, 3838)
End If

hProcess便是先前的例子中所取得的那个Process Handle， 3838所指的是传给
GetExitCodeProcess()中的第二叁数，这是我们任意给的，但最好不要是0，因为
0一般是代表正常结束，当然这样设也不会有错。当然不可设&H103，以这个例子来
看，如果程式正处于以下的LOOP
Do
Call GetExitCodeProcess(hProcess, ExitCode)
Debug.Print ExitCode
DoEvents
Loop While ExitCode = STILL_ALIVE
Debug.print ExitCode

而执行了 TerminateProcess(hProcess, 3838)那会看到ExitCode = 3838。然
而，这个方式在win95没问题，在NT中，可能您要在OpenProcess()的第一个叁数要
更改成 PROCESS_QUERY_INFORMATION Or PROCESS_TERMINATE 这样才能Work。不过
良心的建议，非到最后关头，不要使用TerminateProcess()，因不正常的结束，往
往许多程式结束前所要做的事都没有做，可能造成Resource的浪费，甚者，下次再
执行某些程式时会有问题，例如：本人常使用MS-dos Shell Link 的方式执行一程
式，透过Com port与大电脑的联结，如果Ms-dos Shell Link 不正常结束，下次再
想Link时，会发现too Many Opens，这便是一例。

另外，有人使用Shell来执行.bat档，即：
pid = Shell("c:\aa.bat", vbNormalFocus)
可是却遇上aa.bat结束了，但ms-dos的Window却仍活着，那可以用以下的方式来做
pid = Shell("c:\command.com /c c:\aa.bat", vbNormalFocus)
那是执行Command.com，而Command.com指定执行c:\aa.bat 而且结束时自动Close
所有程式如下：
Private Declare Function OpenProcess Lib "kernel32" _
(ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, _
ByVal dwProcessId As Long) As Long

Private Declare Function WaitForSingleObject Lib "kernel32" _
(ByVal hHandle As Long, ByVal dwMilliseconds As Long) 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 Declare Function TerminateProcess Lib "kernel32" _
(ByVal hProcess As Long, ByVal uExitCode As Long) As Long
Private Declare Function GetForegroundWindow Lib "user32" () As Long
Private Declare Function IsWindow Lib "user32" _
(ByVal hwnd As Long) As Long

Const PROCESS_QUERY_INFORMATION = &H400
Const STILL_ALIVE = &H103
Const INFIN99vE = &HFFFF

Private ExitCode As Long
Private hProcess As Long
Private isDone As Long
Private Sub Command1_Click()
Dim pid As Long
pid = Shell("C:\tools\spe\pe2.exe", vbNormalFocus)
hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, 0, pid)
isDone = False
Do
Call GetExitCodeProcess(hProcess, ExitCode)
Debug.Print ExitCode
DoEvents
Loop While ExitCode = STILL_ALIVE
Call CloseHandle(hProcess)
isDone = True
End Sub

Private Sub Command2_Click()
Dim pid As Long
Dim ExitEvent As Long
pid = Shell("C:\tools\spe3\pe2.exe", vbNormalFocus)
hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, 0, pid)
ExitEvent = WaitForSingleObject(hProcess, INFIN99vE)
Call CloseHandle(hProcess)
End Sub

Private Sub Command3_Click()
Dim aa As Long
If hProcess <> 0 Then
aa = TerminateProcess(hProcess, 3838)
End If

End Sub

Private Sub Command4_Click()
Dim pid As Long
Dim hwnd5 As Long
pid = Shell("c:\tools\spe3\pe2.exe", vbNormalFocus)
hwnd5 = GetForegroundWindow()
isDone = False
Do While IsWindow(hwnd5)
DoEvents
Loop
isDone = True
End Sub

Private Sub Command5_Click()
Dim pid As Long
'pid = Shell("c:\windows\command\xcopy c:\aa.bat a:", vbHide)
pid = Shell("c:\command.com /c c:\aa.bat", vbNormalFocus)
End Sub

[url]http://blog.csdn.net/szwangdf/archive/2007/01/29/1496640.aspx[/url]

【Modest】:
在使用shell后,如何等待此程序完成后,程序才继续执行.我们使用 shell 调用一个外部程序的时候,通常 vb(a) 会在调用之后继续下面的语句,而不管此 shell 程序执行完成没有.有时我们需要在此 shell 执行完成之后才继续,又当如何呢?
请看源程:
Public Declare Function OpenProcess Lib "kernel32" Alias "OpenProcess" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Public Declare Function WaitForSingleObject Lib "kernel32" Alias "WaitForSingleObject" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
Public Declare Function CloseHandle Lib "kernel32" Alias "CloseHandle" (ByVal hObject As Long) As Long
Dim lngPId As Long
Dim lngPHandle As Long
lngPId = Shell("Notepad", vbNormalFocus)
lngPHandle = OpenProcess(SYNCHRONIZE, 0, lngpId)
If lngPHandle <> 0 Then
    Call WaitForSingleObject(lngPHandle, INFINITE) ' 无限等待， 直到程式结束
    Call CloseHandle(lngPHandle)
End If
需要注意的是,在 shell 程序未完成前,你的程序不能做任何事,请小心为之

[url]http://bbs.office-cn.net/dispbbs.asp?boardid=150&ID=7623[/url]

【laviewpbt】:
Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function ShellExecuteEx Lib "shell32.dll" Alias "ShellExecuteExA" (lpInfo As Any) As Long

Private Type SHELLEXECUTEINFO
       cbSize  As Long
       fMask  As Long
       hwnd  As Long
       lpVerb  As String
       lpFile  As String
       lpParameters  As String
       lpDirectory  As String
       nShow  As Long
       hInstApp  As Long
       '  Optional  members
       lpIDList  As Long
       lpClass    As String
       hkeyClass  As Long
       dwHotKey  As Long
       hIcon_OR_Monitor  As Long
       hProcess  As Long
End Type

 Private Sub Form_Load()
    Dim si   As SHELLEXECUTEINFO
    si.cbSize = Len(si)
    si.lpVerb = "open"
    si.lpFile = "notepad.exe"
    si.lpParameters = ""
    si.lpDirectory = ""
    si.nShow = 5            'SW_SHOW
    si.fMask = &H40      'SEE_MASK_NOCLOSEPROCESS
    ShellExecuteEx si
    If si.hProcess <> 0 Then
        WaitForSingleObject si.hProcess, &HFFFFFFFF      '  无限等待，  直到程式结束
        CloseHandle si.hProcess
        MsgBox "程序运行完毕！"
    End If
End Sub