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_WinAPI_ShellChangeNotifyRegister problem

Go to solution Solved by LarsJ,

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#include <APIShellExConstants.au3>
#include <MsgBoxConstants.au3>
#include <WinAPI.au3>
#include <WinAPIShellEx.au3>

Opt('TrayAutoPause', 0)

Global Const $g_sPath = @ScriptDir & '\~TEST~'

If Not FileExists($g_sPath) Then
    MsgBox(BitOR($MB_ICONERROR, $MB_SYSTEMMODAL), 'Error', 'Unable to create folder.')


Local $hWnd = GUICreate('')
Local $iMsg = _WinAPI_RegisterWindowMessage('SHELLCHANGENOTIFY')
If @error Then
    MsgBox(BitOR($MB_ICONERROR, $MB_SYSTEMMODAL), 'Error', 'Window does not registered.')

While 1

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

    Local $sPath = _WinAPI_ShellGetPathFromIDList(DllStructGetData(DllStructCreate('dword Item1; dword Item2', $wParam), 'Item1'))
    If $sPath Then
        ConsoleWrite('Event: 0x' & Hex($lParam) & ' | Path: ' & $sPath & @CRLF)
        ConsoleWrite('Event: 0x' & Hex($lParam) & @CRLF)

Func OnAutoItExit()
    If $g_iID Then
EndFunc   ;==>OnAutoItExit

It is the Example script from Help file. My OS is WindowsXP.

When I copy a file into the '~TEST~' folder,console output is OK as below:

Event: 0x00000002 | Path: E:~TEST~1.au3

But when I download a file via FireFox into the folder, console output is as below:

Event: 0x00001000 | Path: E:~TEST~

A file named [filename].part is created in the folder, why the file name is missing?

Edited by linbin
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on firefox the .part file = the temp file while downloading before creating the real file.

after creating the realfile this .part file is deleted


but why the script can't output the part file name on console?

Also after the real file is created, the console output is  Event: 0x00001000 | Path: E:~TEST~  AGAIN.

How can I get the file name?

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I test it on Win7 and it works.

The console output is as below when I  download QQ6.4.exe via Firefox :

Event: 0x00000002 | Path: D:QQ6.4.exe
Event: 0x00000002 | Path: D:QQ6.4.exe.part
Event: 0x00002000 | Path: D:QQ6.4.exe.part
Event: 0x00002000 | Path: D:QQ6.4.exe.part
Event: 0x00000004 | Path: D:QQ6.4.exe
Event: 0x00000001 | Path: D:QQ6.4.exe.part
Event: 0x00002000 | Path: D:QQ6.4.exe
Event: 0x00002000 | Path: D:QQ6.4.exe


Why it doesn't work in WinXP?  Is it a bug?

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  • Solution

I don't think this is a bug. This is a limitation of Windows XP.

In the bottom of the remarks for SHChangeNotifyRegister you can read:

"For performance reasons, multiple notifications can be combined into a single notification. For example, if a large number of SHCNE_UPDATEITEM notifications are generated for files in the same folder, they can be joined into a single SHCNE_UPDATEDIR notification."

The event you are receiving in post 1 (0x00001000) is exactly SHCNE_UPDATEDIR. Post 4 confirms that downloading a file generates a lot of events.

On XP all these events are joined into a single SHCNE_UPDATEDIR notification.

On Win 7 which is newer and faster there are no performance issues, and you are receiving all the events.

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