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poila

Does ListView sorting sort integers correctly?

3 posts in this topic

#1 ·  Posted (edited)

I was reading the Helpfile on both GUICtrlRegisterListViewSort and _GUICtrlListView_SimpleSort, and after running my script, I was initially satisfied with the way columns are sorted when the user clicks on the column header.

But at certain occasions, clicking on the column header to sort numbers - integers in particular - seem to have some unexpected behaviour.

I cannot verify if it is due to the way I wrote the script, or because the functions used in AutoIt to sort numbers intentionally work the way they do.

Example:

Column ID | Item ID | Item Name | Date

1 | ID_1 | One | 14/05/2014

2 | ID_2 | Two| 14/05/2014

3 | ID_3 | Three| 14/05/2014

10 | ID_4 | Four| 14/05/2014

9 | ID_5 | Five| 14/05/2014

27 | ID_6 | Siz| 15/05/2014

When the user clicks Column ID, logically the order of ascending sorting would look like this:

1, 2, 3, 9, 10, 27

But what I got is like this:

1, 10, 2, 27, 3, 9

Does anyone know the reason behind the way it is sorted this way?

How then do I get the columns to be sorted correctly when the user clicks the column header?

(I did read across other related threads like  and )

I attached my codes here to see if I might write them wrongly.

My code for generating ListView:

$inventoryList = GUICtrlCreateListView("ID|item id|item name| Date", 45, 140, expandGUIX(750), expandGUIY(450), $LVS_REPORT, BitOR($LVS_EX_FULLROWSELECT, $WS_EX_CLIENTEDGE))
_GUICtrlListView_SetColumnWidth(-1, 3, 651)
$hInventoryList = GUICtrlGetHandle($inventoryList)
For $i = 0 To 3
    _GUICtrlListView_SetColumnWidth($inventoryList, $i, $LVSCW_AUTOSIZE_USEHEADER)
Next

My code for auto-resizing columns:

Func resizeColumns($hWnd, $listView, $iColumns, $iGUI_Width, $iGUI_Height)
    ; Check top index - if not 0 then we have a scroll bar so increase ListView width
    Local $iScroll_Allowance
    If _GUICtrlListView_GetTopIndex($listView) > 0 Then
        $iScroll_Allowance = 17
    EndIf

    ; Determine ListView width
    Local $iLV_Width = $iScroll_Allowance
    Local $iData_Width, $iHeader_Width
    Local $i = 0
    For $i = 0 To $iColumns - 1
        ; Size column to fit header
        _GUICtrlListView_SetColumnWidth($listView, $i, $LVSCW_AUTOSIZE_USEHEADER)
        $iHeader_Width = _GUICtrlListView_GetColumnWidth($listView, $i)
        ; Now size column to fit data
        _GUICtrlListView_SetColumnWidth($listView, $i, $LVSCW_AUTOSIZE)
        $iData_Width = _GUICtrlListView_GetColumnWidth($listView, $i)
        ; If header is wider, reset width
        If $iHeader_Width > $iData_Width Then
            _GUICtrlListView_SetColumnWidth($listView, $i, $iHeader_Width)
            $iLV_Width += $iHeader_Width
        Else
            $iLV_Width += $iData_Width
        EndIf
    Next

    ; Resize ListView and GUI to fit data
    ControlMove($hWnd, "", $listView, 10, 10, $iLV_Width + 10, $iGUI_Height - 20) ; Add 10 for internal ListView borders
EndFunc   ;==>resizeColumns

My code for locking users from resizing columns after auto-resize:

Func _WM_NOTIFY($hWnd, $iMsg, $wParam, $lParam)
    #forceref $hWnd, $iMsg, $wParam

    ; Get details of message
    Local $tNMHEADER = DllStructCreate($tagNMHEADER, $lParam)
    ; Look for header resize code
    $iCode = DllStructGetData($tNMHEADER, "Code")
    Switch $iCode
        Case $HDN_BEGINTRACKW
            ; Prevent resizing
            Return True
        Case $LVN_COLUMNCLICK
            ; Sort column
            $tInfo = DllStructCreate($tagNMLISTVIEW, $lParam)
            $iCol = DllStructGetData($tInfo, "SubItem")
            _GUICtrlListView_SimpleSort($cListView, $g_bSortSense, $iCol)
    EndSwitch

    Return $__LISTVIEWCONSTANT_GUI_RUNDEFMSG
EndFunc   ;==>_WM_NOTIFY
Edited by poila

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It's called a lexical or lexicographical sort, it sorts by the character values, not the numeric values.


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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#3 ·  Posted (edited)

Hi BrewManNH,

Thanks for the tip. I just did a search on the forums and came across this thread that's related to lexical sort ('?do=embed' frameborder='0' data-embedContent>>).

(Gonna add 'lexical' to my vocab, sounds new to me ._. )

Not sure of how to integrate the UDF (shown inside the link) into a ListView sort, since the link I shared is for sorting arrays instead of ListView.

Any ideas or has anyone else did proper number sorting before for ListView?

Edited by poila

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      _GUICtrlListView_GetColumnID_ByName()
      Example:
       
      #include <GUIConstantsEx.au3> #include <GuiListView.au3> #include <MsgBoxConstants.au3> Example() Func Example() GUICreate("ListView Get Column ID", 400, 300) Local $idListview = GUICtrlCreateListView("Alfa|Beta|Gama", 2, 2, 394, 268) GUISetState(@SW_SHOW) _GUICtrlListView_SetColumnOrder($idListview, "2|0|1") MsgBox($MB_SYSTEMMODAL, "Information", "Column ID: " & _GUICtrlListView_GetColumnID_ByName($idListview, 'Gama')) ; Loop until the user exits. Do Until GUIGetMsg() = $GUI_EVENT_CLOSE GUIDelete() EndFunc ;==>Example Func _GUICtrlListView_GetColumnID_ByName($hListView, $sColumnToFind) Local $iColumn_Count = _GUICtrlListView_GetColumnCount($hListView) Local $aColumns For $iColumn_idx = 0 To $iColumn_Count - 1 $aColumns = _GUICtrlListView_GetColumn($hListView, $iColumn_idx) If $aColumns[5] = $sColumnToFind Then Return $iColumn_idx EndIf Next Return SetError(1, 0, -1) EndFunc ;==>_GUICtrlListView_GetColumnID_ByName