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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Sep 25, 1999



Application Security Testing: An Integral Part of DevOps

Open the list portion of a ComboBox control

To programmatically open and close the list portion of a ComboBox control, all you need is sending the CB_SHOWDROPDOWN message to the control. Here is a routine that encapsulate the SendMessage API function:

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal _
    hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _
    lParam As Any) As Long
' Show or hide the list portion of a combobox
Sub ComboBoxOpenList(cbo As ComboBox, Optional showIt As Boolean = True)
    SendMessage cbo.hwnd, CB_SHOWDROPDOWN, showIt, ByVal 0&
End Function
Retrieving the current visibility state of the list portion of a ComboBox can be done by sending a message, too. Here is a wrapper function that does it all:

' Returns True if the list portion of a combobox is visible

Function ComboBoxIsListVisible(cbo As ComboBox) As Boolean
    ComboBoxIsListVisible = SendMessage(cbo.hwnd, CB_GETDROPPEDSTATE, 0, _
        ByVal 0&)
End Function
Francesco Balena
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