返回焦点项目的索引
#include <GuiListBox.au3>
_GUICtrlListBox_GetCaretIndex($hWnd)
| $hWnd | 控件的控件ID/句柄 | 
#include <GuiListBox.au3>
#include <GUIConstantsEx.au3>
$Debug_LB = False ;检查传递给 ListBox 函数的类名, 设置为True并输出到一个控件的句柄,用于检查它是否工作
_Main()
Func _Main()
    Local $iIndex, $hListBox
    ; 创建 GUI
    GUICreate("List Box Get Caret Index", 400, 296)
    $hListBox = GUICtrlCreateList("", 2, 2, 396, 296)
    GUISetState()
    ; 添加字符串
    _GUICtrlListBox_BeginUpdate($hListBox)
    For $iI = 1 To 9
        _GUICtrlListBox_AddString($hListBox, StringFormat("%03d : Random string", Random(1, 100, 1)))
    Next
    _GUICtrlListBox_EndUpdate($hListBox)
    ; Set caret index
    _GUICtrlListBox_SetCaretIndex($hListBox, 2)
    ; Read caret index
    $iIndex = _GUICtrlListBox_GetCaretIndex($hListBox)
    _GUICtrlListBox_SetCurSel($hListBox, $iIndex)
    ; 循环直到用户退出
    Do
    Until GUIGetMsg() = $GUI_EVENT_CLOSE
    GUIDelete()
EndFunc   ;==>_Main