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#RequireAdmin
#include <GUIConstantsEx.au3>
#include <ListViewConstants.au3>
#include <WindowsConstants.au3>
Opt("GuiOnEventMode", 1)
Global $DropFilesArr[1]
Global $FilesAllowedMask[4] = [3, ".txt", ".exe", "D"]
$mainFrm = GUICreate("Drop Multiple Files to LV Demo", 500, 400, -1, -1, -1, $WS_EX_ACCEPTFILES+$WS_EX_TOPMOST)
_ChangeWindowMessageFilterEx($mainFrm, 0x233, 1)
_ChangeWindowMessageFilterEx($mainFrm, $WM_COPYDATA, 1)
_ChangeWindowMessageFilterEx($mainFrm, 0x0049, 1)
GUISetOnEvent($GUI_EVENT_CLOSE, "MainEvents")
GUISetOnEvent($GUI_EVENT_DROPPED, "MainEvents")
GUIRegisterMsg(0x233, "WM_DROPFILES_FUNC")
GUICtrlCreateLabel("Drag to the List View some file(s)", 60, 20)
$ListView = GUICtrlCreateListView("Col1", 50, 50, 400, 300, -1, $WS_EX_CLIENTEDGE)
GUICtrlSendMsg(-1, $LVM_SETEXTENDEDLISTVIEWSTYLE, $LVS_EX_HEADERDRAGDROP, $LVS_EX_HEADERDRAGDROP)
GUICtrlSetState(-1, $GUI_DROPACCEPTED)
GUISetState()
While 1
    Sleep(100)
WEnd
Func MainEvents()
    Switch @GUI_CtrlId
        Case $GUI_EVENT_CLOSE
            Exit
        Case $GUI_EVENT_DROPPED
            $NotValidExtPath = ""
            $ValidExtCount = 0
            For $i = 1 To UBound($DropFilesArr)-1
                $ValidExtCount += 1
                GUICtrlCreateListViewItem($DropFilesArr[$i], $ListView)
            Next
            If $ValidExtCount > 0 Then GUICtrlSendMsg($ListView, $LVM_SETCOLUMNWIDTH, 0, -1)
    EndSwitch
EndFunc
Func _IsValidExt($sPath)
    For $i = 1 To $FilesAllowedMask[0]
        If StringRight($sPath, 4) = $FilesAllowedMask[$i] And _
            Not StringInStr(FileGetAttrib($sPath), $FilesAllowedMask[$i]) Then Return True
    Next
    Return False
EndFunc
Func WM_DROPFILES_FUNC($hWnd, $msgID, $wParam, $lParam)
    Local $nSize, $pFileName
    Local $nAmt = DllCall("shell32.dll", "int", "DragQueryFile", "hwnd", $wParam, "int", 0xFFFFFFFF, "ptr", 0, "int", 255)
    For $i = 0 To $nAmt[0] - 1
        $nSize = DllCall("shell32.dll", "int", "DragQueryFile", "hwnd", $wParam, "int", $i, "ptr", 0, "int", 0)
        $nSize = $nSize[0] + 1
        $pFileName = DllStructCreate("char[" & $nSize & "]")
        DllCall("shell32.dll", "int", "DragQueryFile", "hwnd", $wParam, "int", $i, "ptr", _
            DllStructGetPtr($pFileName), "int", $nSize)
        ReDim $DropFilesArr[$i + 2]
        $DropFilesArr[$i+1] = DllStructGetData($pFileName, 1)
        $pFileName = 0
    Next
    $DropFilesArr[0] = UBound($DropFilesArr)-1
EndFunc
Func _ChangeWindowMessageFilterEx($hWnd, $iMsg, $iAction)
    Local $aCall = DllCall("user32.dll", "bool", "ChangeWindowMessageFilterEx", _
            "hwnd", $hWnd, _
            "dword", $iMsg, _
            "dword", $iAction, _
            "ptr", 0)
    If @error Or Not $aCall[0] Then Return SetError(1, 0, 0)
    Return 1
EndFunc
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