Function Reference


Returns the pointer to a callback function that can be passed to the Win32 API.

DllCallbackGetPtr ( handle )


handle A DllCallback handle returned from DllCallbackRegister().

Return Value

Success: the pointer to the callback function.
Failure: 0.


Use DllCallbackGetPtr() to pass the address of a callback function to the Win32 API when using DllCall().


DllCall, DllCallbackFree, DllCallbackRegister


#include <MsgBoxConstants.au3>

; Create callback function.
Local $hHandle = DllCallbackRegister("_EnumWindowsProc", "int", "hwnd;lparam")

; Call EnumWindows.
DllCall("user32.dll", "int", "EnumWindows", "ptr", DllCallbackGetPtr($hHandle), "lparam", 10)

; Delete callback function.

; Callback Procedure
Func _EnumWindowsProc($hWnd, $lParam)
    ; If the Title is empty or if the window is not visible then continue enumeration.
    If WinGetTitle($hWnd) = "" Or BitAND(WinGetState($hWnd), 2) = 0 Then Return 1

    Local $iRes = MsgBox(BitOR($MB_SYSTEMMODAL, $MB_OKCANCEL), _
            WinGetTitle($hWnd), "$hWnd=" & $hWnd & @CRLF & _
            "$lParam=" & $lParam & @CRLF & _
            "$hWnd(type)=" & VarGetType($hWnd))

    If $iRes <> $IDOK Then Return 0 ; Cancel/Close button clicked, return 0 to stop enumeration.

    Return 1 ; Return 1 to continue enumeration.
EndFunc   ;==>_EnumWindowsProc