#include <GUIConstantsEx.au3>
#include <GuiStatusBar.au3>
#include <WindowsConstants.au3>

Global $g_hStatus

Example()

Func Example()
        ; Create GUI
        Local $hGUI = GUICreate("StatusBar Resize (v" & @AutoItVersion & ")", 400, 300, -1, -1, $WS_OVERLAPPEDWINDOW)

        ; Set parts
        $g_hStatus = _GUICtrlStatusBar_Create($hGUI)
        Local $aParts[3] = [75, 150, -1]
        _GUICtrlStatusBar_SetParts($g_hStatus, $aParts)
        _GUICtrlStatusBar_SetText($g_hStatus, "Part 0")
        _GUICtrlStatusBar_SetText($g_hStatus, "Part 1", 1)
        _GUICtrlStatusBar_SetText($g_hStatus, "Part 2", 2)

        GUISetState(@SW_SHOW)

        GUIRegisterMsg($WM_SIZE, "WM_SIZE")

        ; Loop until the user exits.
        Do
        Until GUIGetMsg() = $GUI_EVENT_CLOSE
        GUIDelete()
EndFunc   ;==>Example

; Resize the status bar when GUI size changes
Func WM_SIZE($hWnd, $iMsg, $wParam, $lParam)
        #forceref $hWnd, $iMsg, $wParam, $lParam
        _GUICtrlStatusBar_Resize($g_hStatus)
        Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_SIZE