usnotifycode (USHORT)

      Notify code.

      EN_CHANGE

        The content of the entry field control has changed, and the change has been displayed on the screen.
      EN_KILLFOCUS
        The entry field control is losing the focus.
      EN_MEMERROR
        The entry field control cannot allocate the storage necessary to accommodate window text of the length implied by the EM_SETTEXTLIMIT message.
      EN_OVERFLOW
        The entry field control cannot insert more text than the current text limit. The text limit may be changed with the EM_SETTEXTLIMIT message.

        If the recipient of this message returns TRUE, then the entry field control retries the operation, otherwise it terminates the operation.

      EN_SCROLL
        The entry field control is about to scroll horizontally. This can happen in these circumstances:

        • The application has issued a WinScrollWindow call
        • The content of the entry field control has changed
        • The caret has moved
        • The entry field control must scroll to show the caret position.
        EN_SETFOCUS
          The entry field control is receiving the focus.

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