?
Solved

How do I close a child window with its handle?

Posted on 2008-10-10
7
Medium Priority
?
808 Views
Last Modified: 2010-04-21
I want to close a window after a match a specific pattern.  What's the best way to close the window?

In the below example if the WindowText has "News" within it I want to close that window.

Thanks for you help.

CODE:

  Public Function EnumWindowsCallBack(ByVal hwnd As IntPtr, ByVal lParam As Int32) As Int32
        Dim sSave As String
 
        'Get the windowtext length
        sSave = Space(GetWindowTextLength(hwnd) + 1)
 
        'get the window text
        GetWindowText(hwnd, sSave, Len(sSave))
 
        'remove the last Chr(0)
        sSave = Microsoft.VisualBasic.Left(sSave, Len(sSave) - 1)

        If sSave.IndexOf("News") >= 0 Then
            'WANT TO CLOSE WINDOW
        Else
               If (sSave.Length <> 0) Then
 
                   Lst.Items.Add(sSave)

               End If
            End If
        End If
        If sSave.Trim <> "" Then
            Debug.WriteLine(sSave)
        End If
 
        Return 1 'continue enumeration        
    End Function
0
Comment
Question by:vaultworld
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 10

Expert Comment

by:Smart_Man
ID: 22689728
here is how to get the window handle

me.handle

to close a window you can use

unload me

among a lot other ways to do so.

waiting for your reply
0
 
LVL 11

Expert Comment

by:ladarling
ID: 22689764
You need to send the WM_CLOSE message to the Window.

 Declare Function SendMessage Lib "USER32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As UInt32) As Long
Public Const WM_CLOSE = &H10

Open in new window

0
 
LVL 11

Expert Comment

by:ladarling
ID: 22689775
A sample call might be:

Declare Function SendMessage Lib "USER32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As UInt32) As Long
Public Const WM_CLOSE = &H10
 
SendMessage(windowHandle, WM_CLOSE,0,0)
 
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 2000 total points
ID: 22689797
Get the "root" window using GetAncestor() with GA_ROOT.  Then send a WM_CLOSE directive with SendMessage():

Public Const GA_ROOT As Integer = 2
Public Declare Function GetAncestor Lib "user32.dll" (ByVal hWnd As IntPtr, ByVal gaFlags As Integer) As IntPtr
 
Public Const WM_CLOSE As Integer = &H10
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
 
...
    Dim rootWindow As IntPtr = GetAncestor(hwnd, GA_ROOT)
    SendMessage(rootWindow, WM_CLOSE, 0, 0)

Open in new window

0
 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 22689809
@ladarling...that's a VB6 declaration with "Long" in it...  =\
0
 
LVL 11

Expert Comment

by:ladarling
ID: 22689932
My bad.
 
0
 
LVL 1

Author Closing Comment

by:vaultworld
ID: 31505124
Thanks again,

Now that i have the size and position of the window.

I did have another idea on closing the application simply send a mouse click to the "X" in the upper right to close it.

0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: jpaulino
XML Literals are a great way to handle XML files and the community doesn’t use it as much as it should.  An XML Literal is like a String (http://msdn.microsoft.com/en-us/library/system.string.aspx) Literal, only instead of starting and ending with w…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question