Listview column resize + WM_NOTIFY + Run(@Comspec = result crash

[dragan]

I am getting my script crashed if I use functions like WM_NOTIFY for listview + cmd function + reading it when resizing the listview column. While this example script is running, try to resize listview's column, hold on the column size-bar for some time, resize both, forward and backward, you'll see that the script will crash. Why is that?

expandcollapse popup

#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
#include <GuiListView.au3>
#include <Constants.au3>
$Form1 = GUICreate("Form1", 500, 400)
$List1 = GUICtrlCreateListView("col 1|col 2|col 3|col 4|col 5", 0, 0, 500, 400)
For $i = 0 to 4
_GUICtrlListView_SetColumnWidth($List1, $i, 95)
Next
GUISetState(@SW_SHOW)
GUIRegisterMsg($WM_NOTIFY, "WM_NOTIFY")
AdlibRegister("updatelist", 2000)
While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit
EndSwitch
WEnd
Func updatelist()
if _GUICtrlListView_GetItemCount($List1) >= 10 Then
For $i = 0 to Random(2, 4, 1)
_GUICtrlListView_DeleteItem($List1, $i)
Next
Else
For $i = 1 to Random(1, 3, 1)
GUICtrlCreateListViewItem("data1data1data1|data2data2data2|data3data3data3|data4data4data4|data5data5data5", $List1)
Next
EndIf
Local $iPID = Run(@ComSpec & ' /c netstat -nao', @SystemDir, @SW_HIDE, $STDOUT_CHILD + $STDERR_CHILD)
if @error then Return SetError(3, 0, 0)
Local $sOutput
While 1
     $sOutput &= StdoutRead($iPID)
     If @error Then
         ExitLoop
     EndIf
Sleep(100)
WEnd
ConsoleWrite($sOutput & @LF)
EndFunc
Func WM_NOTIFY($hWnd, $iMsg, $iwParam, $ilParam)
Local $hWndFrom, $iIDFrom, $iCode, $tNMHDR, $hWndListView
$hWndListView = $List1
If Not IsHWnd($List1) Then $hWndListView = GUICtrlGetHandle($List1)
$tNMHDR = DllStructCreate($tagNMHDR, $ilParam)
$hWndFrom = HWnd(DllStructGetData($tNMHDR, "hWndFrom"))
$iCode = DllStructGetData($tNMHDR, "Code")
Switch $hWndFrom
     Case $hWndListView
         Switch $iCode
             Case $NM_CUSTOMDRAW ; randomly chosen function, the more functions there are = the more chance you get crash
                 Local $tCustDraw = DllStructCreate($tagNMLVCUSTOMDRAW, $ilParam)
                 Local $iDrawStage = DllStructGetData($tCustDraw, "dwDrawStage")
                 Switch $iDrawStage
                     Case $CDDS_PREPAINT
                         Return $CDRF_NOTIFYITEMDRAW
                     Case $CDDS_ITEMPREPAINT
                         Return $CDRF_NOTIFYSUBITEMDRAW
                 EndSwitch
                 Local $iSubItem = DllStructGetData($tCustDraw, "iSubItem")
                 If $iSubItem = 4 Then DllStructSetData($tCustDraw, "clrText", 0x038507)
                 Return $CDRF_NEWFONT
         EndSwitch
EndSwitch
Return $GUI_RUNDEFMSG
EndFunc ;==>WM_NOTIFY

[BrewManNH]

The script isn't crashing it's getting stuck in the WM_NOTIFY function. Figure out what is causing it to lock up in there and then prevent it.

[dragan]

I did try, many things in my original script and when I failed I created this example script just to ask about this issue on forum. I'm clueless why is it halting in WM_NOTIFY..

[kylomas]

dragan,

Have you tried disabling the random updates from the adlib? This may be colliding with the notification routine.

kylomas

[dragan]

I need the updates, in my original script my list gets updated constantly, I just simulated those update via adlib in this example.

[dragan]

Maybe if I could block the resizing of columns? Could it be done? I've read that WM_NOTIFY could hook $HDN_BEGINTRACK and set _WinAPI_SetWindowLong to DWL_MSGRESULT (value = 0), but I wasn't successful:

...
Case $HDN_BEGINTRACK
    ConsoleWrite("I got it!"& @LF)
    _WinAPI_SetWindowLong($hWnd, 0, true);
    Return true
...

p.s. it's listview related, not header

Edited December 9, 2012 by dragan

[Melba23]

dragan,

I show how to prevent ListView column resizing here. Plus if you only want to fix the size of specific columns then you can do so like this from later in the same thread.

M23

[dragan]

wow, I never thought it would be that easy thank you for swift reply, I guess this solution will serve me best from halting problem in the original script