CBN_CLOSEUP
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4/8/2010
This message is sent when the list box of a combo box has been closed. The parent window of the combo box receives this message through the WM_COMMAND message.
In general, you cannot predict the order in which messages will be sent. In particular, a CBN_SELCHANGE message may occur either before or after a CBN_CLOSEUP message.
Syntax
CBN_CLOSEUP idComboBox = (int)LOWORD(wParam);
hwndComboBox = (HWND) lParam;
Parameters
- idComboBox
Identifier of the combo box.
- hwndComboBox
Handle to the combo box.
Return Value
None.
Remarks
If the user changed the current selection, the combo box also sends the CBN_SELCHANGE message when the drop-down list closes. In general, you cannot predict the order in which messages will be sent. In particular, a CBN_SELCHANGE message may occur either before or after a CBN_CLOSEUP message.
To execute a specific process each time the user selects a list item, you can handle either the CBN_SELCHANGE or CBN_CLOSEUP message. Typically, you would wait for the CBN_CLOSEUP message before processing a change in the current selection. This can be particularly important if a significant amount of processing is required.
Requirements
| Header | winuser.h |
| Windows Embedded CE | Windows CE 1.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |
See Also
Reference
Combo Boxes Messages
SendMessage
CBN_DROPDOWN
CBN_SELCHANGE
WM_COMMAND