How to Terminating process?

[varsha desai]

Hello All,

I am calling one of the exe with the help of shell command as follows

ProcessId = Shell(ProgramNa me, Window)
hProcess = OpenProcess(PRO CESS_QUERY_INFO RMATION, False, ProcessId)

Do
Call GetExitCodeProc ess(hProcess, exitCode)
DoEvents
Loop While exitCode = STATUS_PENDING
Call CloseHandle(hPr ocess)

In some cases I want to terminate exe and come out from it. For that I am using code like below,
Call PostMessage(hPr ocess, WM_CLOSE, 0&, 0&)
Call PostMessage(hPr ocess, WM_DESTROY, 0&, 0&)
Call PostMessage(hPr ocess, WM_NCDESTROY, 0&, 0&)
TerminateProces s hProcess, 0&

But then also it is not able to terminate exe. ProcessId and hProcess stuff is ok. What can be the reason?

[vijaydiwakar]

try this code

 
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As Long, ByVal lpWindowName As Long) As Long
Private Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function SetParent Lib "user32" (ByVal hWndChild As Long, ByVal hWndNewParent As Long) As Long
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwProcessId As Long) As Long
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
Private Declare Function LockWindowUpdate Lib "user32" (ByVal hwndLock As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long
Private Declare Function DestroyWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function TerminateProcess Lib "kernel32" (ByVal hProcess As Long, ByVal uExitCode As Long) As Long
Private Declare Function GetCurrentProcess Lib "kernel32" () As Long
Private Declare Function Putfocus Lib "user32" Alias "SetFocus" (ByVal hwnd As Long) As Long
Const GW_HWNDNEXT = 2
Dim mWnd As Long
Function InstanceToWnd(ByVal target_pid As Long) As Long
    Dim test_hwnd As Long, test_pid As Long, test_thread_id As Long
    'Find the first window
    test_hwnd = FindWindow(ByVal 0&, ByVal 0&)
    Do While test_hwnd <> 0
        'Check if the window isn't a child
        If GetParent(test_hwnd) = 0 Then
            'Get the window's thread
            test_thread_id = GetWindowThreadProcessId(test_hwnd, test_pid)
            If test_pid = target_pid Then
                InstanceToWnd = test_hwnd
                Exit Do
            End If
        End If
        'retrieve the next window
        test_hwnd = GetWindow(test_hwnd, GW_HWNDNEXT)
    Loop
End Function
Private Sub Form_Load()
    Dim Pid As Long
    'Lock the window update
    LockWindowUpdate GetDesktopWindow
    'Execute notepad.Exe
    Pid = Shell("c:\windows\system32\notepad.exe", vbNormalFocus)
    If Pid = 0 Then MsgBox "Error starting the app"
    'retrieve the handle of the window
    mWnd = InstanceToWnd(Pid)
    'Set the notepad's parent
    SetParent mWnd, Me.hwnd
    'Put the focus on notepad
    Putfocus mWnd
    'Unlock windowupdate
    LockWindowUpdate False
End Sub
Private Sub Form_Unload(Cancel As Integer)
    'Unload notepad
    DestroyWindow mWnd
    'End this program
    TerminateProcess GetCurrentProcess, 0
End Sub

[varsha desai]

Thanks for your reply,
Actually I am calling exe of one of the vb project in my project. This called project does necessary calculations after calling and after doing calculations comes out from it. I am adding stop fuctionality in my project so if user want to stop in between then it will stop calculation of that project and will come out from it again to my project.

I tried your code but it doesn't work for me. Does there can be something in that project which prevent it coming out from it. I don't think so.

try this code

 
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As Long, ByVal lpWindowName As Long) As Long
Private Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function SetParent Lib "user32" (ByVal hWndChild As Long, ByVal hWndNewParent As Long) As Long
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwProcessId As Long) As Long
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
Private Declare Function LockWindowUpdate Lib "user32" (ByVal hwndLock As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long
Private Declare Function DestroyWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function TerminateProcess Lib "kernel32" (ByVal hProcess As Long, ByVal uExitCode As Long) As Long
Private Declare Function GetCurrentProcess Lib "kernel32" () As Long
Private Declare Function Putfocus Lib "user32" Alias "SetFocus" (ByVal hwnd As Long) As Long
Const GW_HWNDNEXT = 2
Dim mWnd As Long
Function InstanceToWnd(ByVal target_pid As Long) As Long
    Dim test_hwnd As Long, test_pid As Long, test_thread_id As Long
    'Find the first window
    test_hwnd = FindWindow(ByVal 0&, ByVal 0&)
    Do While test_hwnd <> 0
        'Check if the window isn't a child
        If GetParent(test_hwnd) = 0 Then
            'Get the window's thread
            test_thread_id = GetWindowThreadProcessId(test_hwnd, test_pid)
            If test_pid = target_pid Then
                InstanceToWnd = test_hwnd
                Exit Do
            End If
        End If
        'retrieve the next window
        test_hwnd = GetWindow(test_hwnd, GW_HWNDNEXT)
    Loop
End Function
Private Sub Form_Load()
    Dim Pid As Long
    'Lock the window update
    LockWindowUpdate GetDesktopWindow
    'Execute notepad.Exe
    Pid = Shell("c:\windows\system32\notepad.exe", vbNormalFocus)
    If Pid = 0 Then MsgBox "Error starting the app"
    'retrieve the handle of the window
    mWnd = InstanceToWnd(Pid)
    'Set the notepad's parent
    SetParent mWnd, Me.hwnd
    'Put the focus on notepad
    Putfocus mWnd
    'Unlock windowupdate
    LockWindowUpdate False
End Sub
Private Sub Form_Unload(Cancel As Integer)
    'Unload notepad
    DestroyWindow mWnd
    'End this program
    TerminateProcess GetCurrentProcess, 0
End Sub

[vijaydiwakar]

Thanks for your reply,
Actually I am calling exe of one of the vb project in my project. This called project does necessary calculations after calling and after doing calculations comes out from it.

if this is the main functionality then y don't u go for dll insted of exe

[varsha desai]

What is the purpose of using exe than dll? Is it difference of in-process and out-process? Do you mean to say if I will use exe rather than dll then it may work. If yes then I should ask for other team members(we don't have authority do it) to make dll. Do you think that there can be anything in project itself which prevent's by termainating it because if I click stop then it finish current calculation which it is doing and then comes out of exe, means it comes out of exe but after doing all calculations.

[vijaydiwakar]

What is the purpose of using exe than dll? Is it difference of in-process and out-process? Do you mean to say if I will use exe rather than dll then it may work. If yes then I should ask for other team members(we don't have authority do it) to make dll. Do you think that there can be anything in project itself which prevent's by termainating it because if I click stop then it finish current calculation which it is doing and then comes out of exe, means it comes out of exe but after doing all calculations.

See versha
the main purpose of useing dll is not in process or out process
the main aim is the communication between tow applications
just visualise the scope

[pongscript]

Try using
CreateProcess() Instead of of Shell()

you can have more precise control on the out come.

[varsha desai]

Till no luck. Does this problem can be because of window I am using? I am using window XP. Does WinXP is more strict regarding to process permissions?

[pongscript]

Public Function EndProcess(ProcessID) As Boolean
On Error Resume Next
Dim Process_handle As Long
Dim Process_exit_Handle As Long
Dim Proc_id As Long
Proc_id = ProcessID
        Process_handle = OpenProcess(PROCESS_ALL_ACCESS, False, Proc_id)
        If Process_handle <> 0 Then
            Process_exit_Handle = TerminateProcess(Process_handle, 0&)
            CloseHandle Process_handle
            CloseHandle Process_exit_Handle
            EndProcess = (Process_handle <> 0) And (Process_exit_Handle <> 0)
        End If
End Function

try to use this code on terminating your process, i didnt include the declaration for API... you could pass the processid that came from the createprocess method...hope this solves your problem