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CraigA

Handle a LB_ADDSTRING Message for a listBox

3 posts in this topic

How can a script intercept (and then pass on) a LB_ADDSTRING message that is sent to a listbox on a AutoIt GUI.

The script just needs to be notified when the messages arrives and it will get the string that was placed in the listbox.

I am pretty sure both of the following function calls should generate this message:

ControlCommand($ScriptName, "", "[CLASS:ListBox; INSTANCE:1]", "AddString", "1") or

_GUICtrlListBox_AddString($handle, "1")

I have found a few examples that handle listbox notification messages, send a LB_ADDSTRING message but none that process LB_ADDSTRING.

In C:\Program Files\AutoIt3\Include\ListBoxConstants.au3:

Global Const $LB_ADDSTRING = 0x0180

A "click" of the listbox or another button will not work since the GUI is hidden.

With Opt("GUIOnEventMode", 1), a loop to check the number of items in a list box is not possible since the script calls WinWaitActive() within a loop.

And besides, it would be cool to learn how to intercept this message.

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#2 ·  Posted (edited)

I haven't working solution but here are my quick attempts,

so you can get it as start point to your observations:

#include <GUIConstants.au3>
#include <GuiList.au3>

;~ Global Const $LB_ADDSTRING = 0x0180
Global Const $WM_NOTIFY = 0x004E
Global Const $WM_COMMAND = 0x0111

$GUI =  GuiCreate("List",270,400,-1,-1)
$list = GUICtrlCreateList("", 45, 50, 200, 310)
GUISetState(@SW_SHOW,$gui)
GUIRegisterMsg($WM_NOTIFY, "WM_Notify_Events")
GUIRegisterMsg($LB_ADDSTRING, "MY_WM_ADDSTRING")
;~ GUIRegisterMsg ($WM_COMMAND, "MY_WM_COMMAND")

;~ _GUICtrlListBox_AddString($list, "1")
GUICtrlSendMsg($List, $LB_ADDSTRING, 0, '123')

While 1
    $msg = GuiGetMsg()
    Select
        Case $msg = $GUI_EVENT_CLOSE
            Exit
        Case Else
    EndSelect
WEnd

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
        Select
;~             Case $event = $LB_ADDSTRING
            Case $MsgID = $LB_ADDSTRING
                ConsoleWrite('123')
            EndSelect
    EndSelect
EndFunc 
  
Func MY_WM_ADDSTRING($hWnd, $Msg, $wParam, $lParam)
    ConsoleWrite('123')
EndFunc

Func MY_WM_COMMAND($hWnd, $msg, $wParam, $lParam)
    $nNotifyCode = _HiWord($wParam)
    $nID = _LoWord($wParam)
    $hCtrl = $lParam
    
    If $nID = $list Then
        Switch $nNotifyCode
            Case $LB_ADDSTRING
                ConsoleWrite('123')
        EndSwitch
    EndIf
    Return $GUI_RUNDEFMSG
EndFunc

Func _HiWord($x)
    Return BitShift($x, 16)
EndFunc

Func _LoWord($x)
    Return BitAND($x, 0xFFFF)
EndFunc
Edited by Zedna

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Zedna, thanks so much for your reply.

I gave it a go, making a few changes to your code, and testing with a visible window.

I used another script, that added a string to the listBox with:

$rc = ControlCommand("List", "", "[CLASS:ListBox; INSTANCE:1]", "AddString", "777")

Adding a string fired no events that were detected by any of the three event procs.

MY_WM_COMMAND did capture events related to the GUI gaining or losing focus as shown by this output:

==> my_wm_command::

==> my_wm_command:: our $list.

==> my_wm_command:: our $list, Case Else, $nNotifyCode: 5

==> my_wm_command::

==> my_wm_command:: our $list.

==> my_wm_command:: our $list, Case Else, $nNotifyCode: 4

*** Some Code Not Shown ***

#include <GUIConstants.au3>
#include <GuiListBox.au3>
#include <ListBoxConstants.au3>

;~ Global Const $LB_ADDSTRING = 0x0180
;Global Const $WM_NOTIFY = 0x004E
;Global Const $WM_COMMAND = 0x0111

$GUI =  GuiCreate("List",270,400,-1,-1)
$list = GUICtrlCreateList("", 45, 50, 200, 310)
GUISetState(@SW_SHOW,$gui)
GUIRegisterMsg($WM_NOTIFY, "WM_Notify_Events")
GUIRegisterMsg($LB_ADDSTRING, "MY_WM_ADDSTRING")
GUIRegisterMsg ($WM_COMMAND, "MY_WM_COMMAND")

;~ _GUICtrlListBox_AddString($list, "1")
GUICtrlSendMsg($List, $LB_ADDSTRING, 0, '123')

While 1
    $msg = GuiGetMsg()
    Select
        Case $msg = 0 
        Case $msg = $GUI_EVENT_CLOSE
            Exit
        Case $msg = 110
        Case Else
            ConsoleWrite(@LF + "msgLoop:: Case Else, $msg: " & $msg)
    EndSelect
WEnd

Func MY_WM_COMMAND($hWnd, $msg, $wParam, $lParam)
    $nNotifyCode = _HiWord($wParam)
    $nID = _LoWord($wParam)
    $hCtrl = $lParam
    ConsoleWrite(@LF & "==> my_wm_command::")
    If $nID = $list Then
        ConsoleWrite(@LF & "==> my_wm_command:: our $list.")
        Switch $nNotifyCode
            Case $LB_ADDSTRING
                MsgBox(0,"","my_wm_command:: case $lb_addstring")
                ConsoleWrite('123')
            Case Else
                ConsoleWrite(@LF & "==> my_wm_command:: our $list, Case Else, $nNotifyCode: " & $nNotifyCode & @LF)
        EndSwitch
    EndIf
    Return $GUI_RUNDEFMSG
EndFunc

Perhaps I can find a solution using the NamedPipes Management UDF's.

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