Requests that the operating system signal a change notification handle the next time it detects an appropriate change
#include <WinAPIFiles.au3>
_WinAPI_FindNextChangeNotification ( $hChange )
| $hChange | A handle to a change notification handle created by the _WinAPI_FindFirstChangeNotification() function. |
| Success: | True. |
| Failure: | False, call _WinAPI_GetLastError() to get extended error information |
After the _WinAPI_FindNextChangeNotification() function returns successfully, the application can wait for notification that a change has occurred by using the _WinAPI_Wait... functions.
The _WinAPI_FindNextChangeNotification() function should not be used more than once on the same handle without using one of the wait functions.
An application may miss a change notification if it uses _WinAPI_FindNextChangeNotification() when there is a change request outstanding.
_WinAPI_FindFirstChangeNotification
Search FindNextChangeNotification in MSDN Library.
#include <APIFilesConstants.au3>
#include <MsgBoxConstants.au3>
#include <WinAPIFiles.au3>
#include <WinAPIProc.au3>
Opt('TrayAutoPause', 0)
Global Const $g_sPath = @TempDir & '\~TEST~'
DirCreate($g_sPath)
If Not FileExists($g_sPath) Then
MsgBox(($MB_ICONERROR + $MB_SYSTEMMODAL), 'Error', 'Unable to create folder.')
Exit
EndIf
ShellExecute($g_sPath) ; to ease a file creation in this folder
OnAutoItExitRegister('OnAutoItExit')
Global $g_ahObj[2]
$g_ahObj[0] = _WinAPI_FindFirstChangeNotification($g_sPath, $FILE_NOTIFY_CHANGE_FILE_NAME)
$g_ahObj[1] = _WinAPI_FindFirstChangeNotification($g_sPath, $FILE_NOTIFY_CHANGE_DIR_NAME)
If (Not $g_ahObj[0]) Or (Not $g_ahObj[1]) Then
MsgBox(($MB_ICONERROR + $MB_SYSTEMMODAL), 'Error', 'Unable to create change notification.')
Exit
EndIf
Local $tObjs = DllStructCreate('ptr;ptr')
Local $paObj = DllStructGetPtr($tObjs)
For $i = 0 To 1
DllStructSetData($tObjs, $i + 1, $g_ahObj[$i])
Next
Local $iID
While 1
Sleep(100)
$iID = _WinAPI_WaitForMultipleObjects(2, $paObj, 0, 0)
Switch $iID
Case 0 ; WAIT_OBJECT_0
ConsoleWrite('A file was created, renamed, or deleted in the directory.' & @CRLF)
Case 1 ; WAIT_OBJECT_0 + 1
ConsoleWrite('A directory was created, renamed, or deleted.' & @CRLF)
Case Else
ContinueLoop
EndSwitch
If Not _WinAPI_FindNextChangeNotification($g_ahObj[$iID]) Then
MsgBox(($MB_ICONERROR + $MB_SYSTEMMODAL), 'Error', 'Unexpected error.')
Exit
EndIf
WEnd
Func OnAutoItExit()
For $i = 0 To 1
If $g_ahObj[$i] Then
_WinAPI_FindCloseChangeNotification($g_ahObj[$i])
EndIf
Next
DirRemove($g_sPath, $DIR_REMOVE)
EndFunc ;==>OnAutoItExit