获取活动窗口的标题。
WinGetActiveTitle, OutputVar
用来保存活动窗口标题的变量名.
此命令相当于：WinGetTitle, OutputVar, A。
WinGetTitle, OutputVar, A
WinGetPos, WinGetActiveStats, WinGetTitle, WinGetClass, WinGetText, ControlGetText
WinGetActiveTitle, Title MsgBox, The active window is "%Title%".
