Problem using WM_Close in c#

Question

I am trying to use the below code to close the window.

But getting error in

"IntPtr hWnd = PostMessage(IntPtr.Zero, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);"

where to provide the window name in order to close that ??? And there is also some problem in the parameters i pass.

---

  void DaemonTerminamtionHook_KeyPressed(object sender, KeyPressedEventArgs e)
{
    DaemonResult = MessageBox.Show("Are you sure, you want to Terminate Daemon?", "Terminate Daemon", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation);

    if (DaemonResult == DialogResult.Yes)
    {

        IntPtr hWnd = PostMessage(IntPtr.Zero, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
        bool ret = CloseWindow(hWnd);
    }
}



static uint WM_CLOSE = 0x10;
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", SetLastError = true)]
static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

static bool CloseWindow(IntPtr hWnd)
{
    bool returnValue = PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
    if (!returnValue)
        throw new Win32Exception(Marshal.GetLastWin32Error());
    return true;
}

After modification of code, but still no luck. since i am new to windows messaging kinda stuff.

    void DaemonTerminamtionHook_KeyPressed(object sender, KeyPressedEventArgs e)
    {
        DaemonResult = MessageBox.Show("Are you sure, you want to Terminate Daemon?", "Terminate Daemon", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation);

        if (DaemonResult == DialogResult.Yes)
        {
            IntPtr hWnd = FindWindow(null, "DAEMON TAB BAR");
            bool ret = CloseWindow(hWnd);
        }
    }

    static bool CloseWindow(IntPtr hWnd)
    {
        //How to call it here
        return true;
    }

Answer 1

If I understand correctly what you are trying to do you should first get the window handle of the window you want to close using FindWindow . Your code would look something like this:

IntPtr hWnd = FindWindow(null, <WindowName>);
bool ret = CloseWindow(hWnd);

Define FindWindow as:

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

Answer 2

Why are you making nasty hacks, while you can just call Process.CloseMainWindow() ?

http://msdn.microsoft.com/en-us/library/system.diagnostics.process.closemainwindow.aspx