Get handle of top window (Sort windows by Z index)

Question

I am trying to write a method which takes List of window handles and returns handle of the window which has highest z index among others. But in vain. Can anybody give me a suggestion how to do that?

Pretty vague. Arbitrarily, take the first window in the list and call GetWindow(), passing GHWND_PREV. Check if it is in the list. Repeat until GetWindow() returns null. — Hans Passant
– Hans Passant, Commented Nov 21, 2014 at 17:39

Jason White · Accepted Answer · 2014-11-21 18:06:54Z

3

I'll help you out:

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr GetWindow(IntPtr hWnd, GetWindow_Cmd uCmd);

enum GetWindow_Cmd : uint
{
    GW_HWNDFIRST = 0,
    GW_HWNDLAST = 1,
    GW_HWNDNEXT = 2,
    GW_HWNDPREV = 3,
    GW_OWNER = 4,
    GW_CHILD = 5,
    GW_ENABLEDPOPUP = 6
}

private IntPtr GetTopmostHwnd(List<IntPtr> hwnds)
{
    var topmostHwnd = IntPtr.Zero;

    if (hwnds != null && hwnds.Count > 0)
    {
        var hwnd = hwnds[0];

        while (hwnd != IntPtr.Zero)
        {
            if (hwnds.Contains(hwnd))
            {
                topmostHwnd = hwnd;
            }

            hwnd = GetWindow(hwnd, GetWindow_Cmd.GW_HWNDPREV);
        }
    }

    return topmostHwnd;
}

answered Nov 21, 2014 at 18:06

Jason White

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1 Comment

Aleksandre Sukhitashvili Over a year ago

Thank you Jason. It works well for me. Lately I noticed that window handles which I get by calling EnumWindows() is already sorted by that order :D Thanks anyway.

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