How to detect is a window of another process minimized or maximized?

Question

Currently I'm making a small gadget that made in WPF. It shows and hides according to another window's state.

So, let me name that another window be A. When A get shown or maximized, my gadget shows. When A minimized, my gadget hides.

So, how can I detect the change in state of a window of another process which is not in .NET? Btw sorry for my bad English :P

See: http://stackoverflow.com/questions/6378678/c-capture-windowstate-changes-of-another-application-wrote-in-c-c-i-think — romanoza, Mar 29 '15 at 09:35

romanoza · Accepted Answer · 2019-10-03T09:40:26.743

It's only a part of the solution. If you know the title of the other window:

Process process = Process.GetProcesses().Where(p => p.MainWindowTitle == "Title of window").SingleOrDefault();
if (process != null) {
      IntPtr wHnd = process.MainWindowHandle;
      Console.WriteLine("Minimized: "  + IsIconic(wHnd));
}

and:

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool IsIconic(IntPtr hWnd);

score 0 · Answer 2 · edited May 23 '17 at 12:34

You'll want to get the HWND from the process you want to reach.

How to get main window handle from process id?

It requires loading win32 libraries in your C# WPF app like below.

How can I use EnumWindows to find windows with a specific caption/title?

Once you have the HWND, you can check the visibility of the app by a combination of the WS_VISIBLE and WS_MAXIMIZE properties.

How can I check if a window has WS_VISIBLE to set? (or if is visible)

How to detect is a window of another process minimized or maximized?

2 Answers2