Function Reference

DllCallbackRegister

Creates a user-defined DLL Callback function.

DllCallbackRegister ( "function", "return type", "params" )

Parameters

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.

Return Value

Success: Returns a dll "handle" to be used with DllCallbackGetPtr and DllCallbackFree functions.
Failure: Returns 0 if error occurs.

Remarks

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.

Related

DllCall, DllCallbackFree, DllCallbackGetPtr

Example



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

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

; Delete callback function
DllCallbackFree($handle)

; Callback Procedure
Func _EnumWindowsProc($hWnd, $lParam)
    If WinGetTitle($hWnd) <> "" And BitAND(WinGetState($hWnd), 2) Then
        Local $res = MsgBox(1, WinGetTitle($hWnd), "$hWnd=" & $hWnd & @CRLF & "lParam=" & $lParam & @CRLF & "$hWnd(type)=" & VarGetType($hWnd))
        If $res = 2 Then Return 0 ; Cancel clicked, return 0 to stop enumeration
    EndIf
    Return 1 ; Return 1 to continue enumeration
EndFunc   ;==>_EnumWindowsProc