Creates a user-defined DLL Callback function.
DllCallbackRegister ( "function", "return type", "params" )
| function | The name of the User Defined Function to call. |
| return type | The return type and calling convention of the function (see DllCall). |
| params | A semi-colon separated list of parameters that will be passed to this function. See Remarks. |
| Success: | a dll "handle" to be used with DllCallbackGetPtr() and DllCallbackFree() functions. |
| Failure: | 0 if error occurs. |
Uses all DllCall() types except "struct".
When finished working with a callback, call the DllCallbackFree() function to close it. AutoIt normally closes all files upon termination, but explicitly calling DllCallbackFree() is still a good idea.
DllCall, DllCallbackFree, DllCallbackGetPtr
#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.
DllCallbackFree($hHandle)
; Callback Procedure
Func _EnumWindowsProc($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 $iRes = MsgBox(($MB_OKCANCEL + $MB_SYSTEMMODAL), _
WinGetTitle($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