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Closing Program

Posted on 2003-11-26
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Last Modified: 2010-05-01
I'm making a program and I want it to shutdown AOL Instant Messenger automatically when it runs. How do I do this ?

Please Help A.S.A.P
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Question by:pugandjody
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Expert Comment

by:juliancrawford
ID: 9827506
You can use FindWindow() API and then CloseWindow() api:

Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long

Declare Function CloseWindow Lib "user32" Alias "CloseWindow" (ByVal hwnd As Long) As Long

To use FindWindow you need to know the window class name.  If you don't know what the class name is you can use GetNextWindow() and GetWindowText() to check the open windows until you find the one you need.  Once you get the hWnd of the window, simply use

Call CloseWindow(hWnd) to terminate that application.
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Author Comment

by:pugandjody
ID: 9827585
Ok, that seems like it will work, but I don't know how to to that because i'm fairly new at VB. So could you show me the code to do it ?
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Accepted Solution

by:
eclipse707 earned 150 total points
ID: 9828243
The following link should help you.  They explain how to what you are asking so that you can learn and remember it :-)

http://www.freevbcode.com/ShowCode.Asp?ID=935

Let me know if you need any help with it.
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Expert Comment

by:vinnyd79
ID: 9828365
If the window has a caption you can use SendMessage API. Here is a basic example of killing Notepad opened with a blank document.Just paste this onto a form with a command button:

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Const WM_CLOSE = &H10


Private Sub Command1_Click()
Dim Hnd As Long
' Find the window by its caption
Hnd = FindWindow(vbNullString, "Untitled - Notepad")
If Hnd = 0 Then Exit Sub
' send close message to window
SendMessage Hnd, WM_CLOSE, 0&, 0&
End Sub
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