flStyle (ULONG) - input

      Message-box window style.

      These values may be combined using the logical-OR operation but only one value can be taken from each of the following groups.

      Button or Button Group

      MB_OK

        Message box contains an OK push button.
      MB_OKCANCEL
        Message box contains both OK and CANCEL push buttons.
      MB_CANCEL
        Message box contains a CANCEL push button.
      MB_ENTER
        Message box contains an ENTER push button.
      MB_ENTERCANCEL
        Message box contains both ENTER and CANCEL push buttons.
      MB_RETRYCANCEL
        Message box contains both RETRY and CANCEL push buttons.
      MB_ABORTRETRYIGNORE
        Message box contains ABORT, RETRY, and IGNORE push buttons.
      MB_YESNO
        Message box contains both YES and NO push buttons.
      MB_YESNOCANCEL
        Message box contains YES, NO, and CANCEL push buttons.
      Help button

      MB_HELP

        Message box contains a HELP push button. When this is selected a WM_HELP message is sent to the window procedure of the message box.
      Color or Icon

      MB_ERROR

        Message box contains a small red circle with a red line across it.
      MB_ICONASTERISK
        Message box contains an information (i) icon.
      MB_ICONEXCLAMATION
        Message box contains an exclamation point (!) icon.
      MB_ICONHAND
        Message box contains a small red circle with a red line across it.
      MB_ICONQUESTION
        Message box contains a question mark (?) icon.
      MB_INFORMATION
        Message box contains an information (i) icon.
      MB_NOICON
        Message box is not to contain an icon.
      MB_QUERY
        Message box contains a question mark (?) icon.
      MB_WARNING
        Message box contains an exclamation point (!) icon.
      Default action

      MB_DEFBUTTON1

        The first button is the default selection. This is the default case, if none of MB_DEFBUTTON1, MB_DEFBUTTON2, and MB_DEFBUTTON3 is specified.
      MB_DEFBUTTON2
        The second button is the default selection.
      MB_DEFBUTTON3
        The third button is the default selection.
      Modality indicator

      MB_APPLMODAL

        Message box is application modal. This is the default case. Its owner is disabled; therefore, do not specify the owner as the parent if this option is used.
      MB_SYSTEMMODAL
        Message box is system modal.
      Mobility indicator

      MB_MOVEABLE

        Message box is moveable.

        The message box is displayed with a title bar and a system menu, which shows only the Move, Close, and Task Manager choices, which can be selected either by use of the pointing device or by accelerator keys.

        If the user selects Close, the message box is removed and the usResponse is set to MBID_CANCEL, whether or not a cancel button existed within the message box.

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