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WM_KEYDOWN not being received by child GUI with controls

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This is my example script. If you click on the grey areas and press a key you will see a message in the console, but if you click the white area and press a key nothing happens. Removing the checkbox control causes the messages to be received again. Why does having controls in the child GUI block the messages? Is there any way to have the controls and receive the messages?

#AutoIt3Wrapper_Au3Check_Parameters=-q -d -w 1 -w 2 -w 3 -w 4 -w 5 -w 6 -w 7


Func _Main()
    Local $h_Main = GUICreate("", 500, 500)
    Local $h_Child = GUICreate("", 500, 300, 0, 100, $WS_POPUP, $WS_EX_MDICHILD, $h_Main)

    GUICtrlCreateCheckbox("Test ", 10, 10)


    GUISetState(@SW_SHOW, $h_Main)
    GUISetState(@SW_SHOW, $h_Child)

    While GUIGetMsg() <> -3

    Local Static $f = True
    ConsoleWrite((($f) ? ("+>") : ("!>")) & "WM_KEYDOWN" & @CRLF)
    $f = Not $f

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Welcome to the AutoIt forum. :)

I imagine the key is being eaten by the checkbox changing state before it ever reaches the message handler. But to change that behaviour would probably require subclassing the checkbox WndProc. ;)


Public_Domain.png.2d871819fcb9957cf44f4514551a2935.png Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind

Open spoiler to see my UDFs:


ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area


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Hi and Welcome to the forums!

I was typing something up, but meh. What Melba said.

Look up _WinAPI_SetWindowsHookEx() in the helpfile and search for examples in the forum. Try and figure it out, and if you have any problems, just ask.

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I should have mentioned that this also happens with label and pic controls. I assume _WinAPI_SetWindowsHookEx() will be need either way so I'll look into it.

EDIT: It looks like _WinAPI_SetWindowsHookEx() doesn't capture 'Home' or 'End' keys which are the only ones I'm interested in.

Edited by piginablanket

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