SetFocus SetActiveWindow 被设置的对象需要为设置的孩子等
SetFocus
SetFocus([in] HWND hWnd)
// If the function succeeds, the return value is the handle to the window that previously had the keyboard focus. If the hWnd parameter is invalid or the
// window is not attached to the calling thread's message queue, the return value is NULL.
SetActiveWindow
SetActiveWindow([in] HWND hWnd )
// Activates a window. The window must be attached to the calling thread's message queue.
// If the function succeeds, the return value is the handle to the window that was previously active.
// If the function fails, the return value is NULL.
标签:SetFocus,return,hWnd,value,win32,window,SetActiveWindow
From: https://www.cnblogs.com/sqmw/p/17073943.html