Re: Read/write status of Check Box via DLL in a 'host' EXE.

Hi Michael,
The following is what I've done until now.
:
Function SimulateButtonClickWithParams(hWndButton As Long, lCheck As
Long) As Long
    'INPUT: hWndButton als Handle des Buttons, lCheck = 1 oder 0
    local lRet As Long
    local hWndParent As Long

    hWndParent = GetParent(hWndButton)
    If hWndParent <> 0& Then
        If SendMessageLong(hWndButton, BM_GETCHECK, 0&, 0&) = 1& Then
            If lCheck = 0& Then 'uncheck
                lRet = SendMessageLong(hWndButton, BM_CLICK, 0&,
lCheck) 'lCheck = 0
            End If
        ElseIf SendMessageLong(hWndButton, BM_GETCHECK, 0&, 0&) = 0&
Then
            If lCheck = 1& Then
                lRet = SendMessageLong(hWndButton, BM_CLICK, 0&,
lCheck) 'lCheck = 1
            End If
        End If
        SimulateButtonClickWithParams = lRet
    End If
End Function

The button handle is correct but the function works only when I first
programaticaly show the tab control where the button resides. I wonder
why.....

Bert