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Conceptual Doubt GUIRegisterMsg

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When we use:

    GUIRegisterMsg($WM_NOTIFY, "WM_NOTIFY")

We create functions for the events, ok

In several examples used we have several ways of doing the same thing and would like to know the differences in performace question or if there is a real reason to use each one of them:

;Case 1
    $hWndFrom = $lParam
    $iIDFrom = BitAND($wParam, 0xFFFF) ; Low Word
    $iCode = BitShift($wParam, 16) ; Hi Word

    $tNMHDR = DllStructCreate($tagNMHDR, $lParam)
    $hWndFrom = HWnd(DllStructGetData($tNMHDR, "hWndFrom"))
    $iIDFrom = DllStructGetData($tNMHDR, "IDFrom")
    $iCode = DllStructGetData($tNMHDR, "Code")
;Case 3

$iIDFrom = _WinAPI_LoWord ($iwParam)
$iCode = _WinAPI_HiWord ($iwParam)

in my opinion Case 1 would be the fastest and most efficient way, if someone can show the advantages and disadvantages of each of them please ...

and possible errors in 32 or 64 bits

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Hello @odaylton, while I am not qualified to speak about the specifics about window GUI messages, I can offer you some general advice:

Case 1: It would be most efficient as you are using AutoIt's native Bit operation functions

Case 2: This would actually be more relevant since the NHMDR tag (structure) is designed to contain information about a message, but how efficient or safe it is depends on how the struct is populated...

Case 3: I think this would be your safest option if you want to get the Hi and Low words, as it is a direct call to the Windows API

Take my advice with a pinch of salt :)

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