Problem Using Wm_notify_events

[Ebenezer]

Hi,

In my GUI I use a function I found on the boards to trigger certain changes changes in the GUI when the user clicks on listview entries. Works like a charm - a big thanks to the author.

However when I try to add a second list to the possible trigger the whole thing crashes, stating that $List_3 is not declared.

Error:

E:\Div\GUI_Auctionhelper.au3 (143) : ==> Variable used without being declared.: 
Case $wParam = $List_3 
Case $wParam = ^ ERROR

Working code:

;Main Function for Listclick actions
Func WM_Notify_Events($hWndGUI, $MsgID, $wParam, $lParam)
    #forceref $hWndGUI, $MsgID, $wParam
    Local $tagNMHDR, $event, $hwndFrom, $code
    $tagNMHDR = DllStructCreate("int;int;int", $lParam);NMHDR (hwndFrom, idFrom, code)
    If @error Then Return
    $event = DllStructGetData($tagNMHDR, 3)
    Select
    Case $wParam = $List_1
        Select
            Case $event = $NM_CLICK
                If _GUICtrlListViewGetItemText ($List_1, _GUICtrlListViewGetSelectedIndices($List_1), 0) == -1 Then
                    _GUICtrlListViewDeleteAllItems($List_2)
                    GUICtrlSetData($Label_11, "<- Select Item ->")
                    GUICtrlSetPos($Label_11, 210, 170, 250, 20)
                    GUICtrlSetState($Input_6, $GUI_HIDE)
                Else
                    GUICtrlSetData($Label_11, _GUICtrlListViewGetItemText ($List_1, _GUICtrlListViewGetSelectedIndices($List_1), 0))
                    GUICtrlSetPos($Label_11, 210, 170, 180)
                    GUICtrlSetState($Input_6, $GUI_SHOW)
                EndIf
            Case $event = $NM_DBLCLK;~ ListView_DoubleClick ()
        EndSelect

    EndSelect
    $tagNMHDR = 0
    $event = 0
    $lParam = 0
EndFunc ;==>WM_Notify_Events

Non-working code:

expandcollapse popup

;Main Function for Listclick actions
Func WM_Notify_Events($hWndGUI, $MsgID, $wParam, $lParam)
    #forceref $hWndGUI, $MsgID, $wParam
    Local $tagNMHDR, $event, $hwndFrom, $code
    $tagNMHDR = DllStructCreate("int;int;int", $lParam);NMHDR (hwndFrom, idFrom, code)
    If @error Then Return
    $event = DllStructGetData($tagNMHDR, 3)
    Select
    Case $wParam = $List_1
        Select
            Case $event = $NM_CLICK
                If _GUICtrlListViewGetItemText ($List_1, _GUICtrlListViewGetSelectedIndices($List_1), 0) == -1 Then
                    _GUICtrlListViewDeleteAllItems($List_2)
                    GUICtrlSetData($Label_11, "<- Select Item ->")
                    GUICtrlSetPos($Label_11, 210, 170, 250, 20)
                    GUICtrlSetState($Input_6, $GUI_HIDE)
                Else
                    GUICtrlSetData($Label_11, _GUICtrlListViewGetItemText ($List_1, _GUICtrlListViewGetSelectedIndices($List_1), 0))
                    GUICtrlSetPos($Label_11, 210, 170, 180)
                    GUICtrlSetState($Input_6, $GUI_SHOW)
                EndIf
            Case $event = $NM_DBLCLK;~ ListView_DoubleClick ()
        EndSelect
    Case $wParam = $List_3
        Select
            Case $event = $NM_CLICK
                If _GUICtrlListViewGetItemText ($List_3, _GUICtrlListViewGetSelectedIndices($List_3), 0) == -1 Then
                    _GUICtrlListViewDeleteAllItems($List_3)
                    GUICtrlSetData($Label_11, "<- Select Item ->")
                    GUICtrlSetPos($Label_11, 210, 170, 250, 20)
                    GUICtrlSetState($Input_6, $GUI_HIDE)
                Else
                    GUICtrlSetData($Label_11, _GUICtrlListViewGetItemText ($List_3, _GUICtrlListViewGetSelectedIndices($List_3), 0))
                    GUICtrlSetPos($Label_11, 210, 170, 180)
                    GUICtrlSetState($Input_6, $GUI_SHOW)
                EndIf
            Case $event = $NM_DBLCLK;~ ListView_DoubleClick ()
        EndSelect
    EndSelect
    $tagNMHDR = 0
    $event = 0
    $lParam = 0
EndFunc ;==>WM_Notify_Events

Could anyone please enlighten me ?

BTW, is there any place to learn more about the code used here?

I could find no info about most of the stuff in there, like "GUIRegisterMsg" or "DllStructCreate". Thanks !

[GaryFrost]

move the guiregistermsg to just above the guisetstate i.e.

;Register WM_NOTIFY  events
GUIRegisterMsg($WM_NOTIFY, "WM_Notify_Events")

GUISetState()

[Ebenezer]

It works.

Thanks a lot! But could you explain to my why it accepted List_1 even though that one too, was defined below it but rejected List_3 even though it was only some 10 lines below in the "same direction".

I would have understood if the code hadn't worked when used before the Lists were declared.

But the difference between the two declarations escapes me ...