I need to read a Listbox in another app

This is a discussion on I need to read a Listbox in another app within the C++ Programming forums, part of the General Programming Boards category; Please help I've been stuck on this for 6 months. I am trying to read data from another application. I ...

  1. #1
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    Exclamation I need to read a Listbox in another app

    Please help I've been stuck on this for 6 months.

    I am trying to read data from another application. I read the microsoft tutorial on msdn about FIndwindow and GetText. That does not work for a Listbox.

    I then moved on to a hook, but my system locks up the minute I start hooking all the messages.

    I know this is possible because I can see all the data using Spy++. If it can do it I should be able to do. If anyone can give me some assistance hear it would be greatly appreciated.

    Best Regards,

    Bonkey

  2. #2
    &TH of undefined behavior Fordy's Avatar
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    Aug 2001
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    Not too difficult.......Here's an idea that should work...

    Use Spy++ to find the class of the main window holding the list box.....

    Use FindWindow() to get a handle to than main window.......

    Now you need to scope out how the window is put together.....A listbox is a child control.......but that's not to say there arent other child windows between the main window and the listbox....ala;

    MAINHWND----->VIEWWND----->LISTBOX

    Spy++ will give up this info and the respective classes & titles without too much bother....

    Now for each child window call FindWindowEx() to get the child window....move up the z order untill you reach the ListBox you wish to use........

    Once you have the HWND you need, use it with the SendMessage() API anf th LB_ messages to play with the listbox and pilfer the info you need....

  3. #3
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    Thanks. I just ran across a VB posting that was sending me down this same track. This looks like a much easier method than the one I was going for.

    Thanks for the quick reply. I'm off to give it a shot.

  4. #4
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    Here is what I have so far. (just created a new app to test with).

    Code:
    void CReadlbView::OnDraw(CDC* pDC)
    {
    	CReadlbDoc* pDoc = GetDocument();
    	ASSERT_VALID(pDoc);
    	// TODO: add draw code for native data here
    	HWND ChildWnd,Wnd;
    
    	CWnd *pParentWnd = FindWindow( "Afx:400000:b:146e:6:35cf",NULL);
    	if(pParentWnd)
    		ChildWnd = FindWindowEx( pParentWnd->m_hWnd,NULL,"#32770",NULL);
    	else
    		pDC->TextOut(1,1,"Parent Window not found!");
    	if( ChildWnd )
    		Wnd = FindWindowEx( ChildWnd , NULL, "ListBox", NULL);
    
    	CListBox myWnd;
    	myWnd.FromHandle(Wnd);
    
    //	pDC->TextOut(1,1,myWnd.SendMessage(LB_GETTEXT));
    	pDC->TextOut(1,1,myWnd.GetCurSel());
    
    }
    However, the SendMessage fails because it fails the assert:

    { ASSERT(::IsWindow(m_hWnd)); return (int)::SendMessage(m_hWnd, LB_GETCURSEL, 0, 0); }

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