Returns a pointer to the foreground window (the window with which the user is currently working). The foreground window applies only to top-level windows (frame windows or dialog boxes).
Returns a pointer to the foreground window (the window with which the user is currently working). The foreground window applies only to top-level windows (frame windows or dialog boxes).
返回指向前台窗口（用户正在其中工作的窗口）的指针。前台窗口仅适用于顶层窗口（框架窗口或对话框）。