Web Reference: Feb 22, 2024 · GetFocus returns the window with the keyboard focus for the current thread's message queue. If GetFocus returns NULL, another thread's queue may be attached to a window that has the keyboard focus. I'm trying to find a reliable way to activate / set focus to a window of an external application using C#. Currently I'm attempting to achieve this using the following Windows API calls: Use the GetForegroundWindow function to retrieve the handle to the window with which the user is currently working. You can associate your thread's message queue with the windows owned by another thread by using the AttachThreadInput function.
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