The CBN_EDITCHANGE notification message is sent after the user has taken an action that may have altered the text in the edit control portion of a combo box. Unlike the CBN_EDITUPDATE notification message, this notification message is sent after the system updates the screen. The parent window of the combo box receives this notification message through the WM_COMMAND message.
CBN_EDITCHANGE
idComboBox = (int) LOWORD(wParam); // identifier of combo box
hwndComboBox = (HWND)lParam; // handle to combo box
If the combo box has the CBS_DROPDOWNLIST style, this notification message does not occur.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.
Combo Boxes Overview, Combo Box Messages, CBN_EDITUPDATE, WM_COMMAND