获取一个多行编辑框最高可见行的索引(从 0 开始)
#include <GuiEdit.au3>
_GUICtrlEdit_GetFirstVisibleLine($hWnd)
| $hWnd | 控件的控件ID/句柄 | 
#include <GuiEdit.au3>
#include <GUIConstantsEx.au3>
$Debug_Ed = False ; Check ClassName being passed to Edit functions, set to True and use a handle to another control to see it work
_Main()
Func _Main()
    Local $hEdit
    ; 创建 GUI
    GUICreate("Edit Get First Visible Line", 400, 300)
    $hEdit = GUICtrlCreateEdit("", 2, 2, 394, 268)
    GUISetState()
    For $x = 0 To 20
        _GUICtrlEdit_AppendText($hEdit, StringFormat("[%02d] Append to the end?", $x) & @CRLF)
    Next
    MsgBox(4160, "信息", "First Visible Line: " & _GUICtrlEdit_GetFirstVisibleLine($hEdit))
    ; 循环直到用户退出
    Do
    Until GUIGetMsg() = $GUI_EVENT_CLOSE
    GUIDelete()
EndFunc   ;==>_Main