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Making a Text Buffer Read-Only
For each edit control, Windows maintains a read-only flag that indicates
whether the control's text is read-write (the default) or read-only. An application
can set the read-write or read-only flag for the text by sending the control an EM_SETREADONLY message. To determine whether an edit control is read-only, an application
can call the GetWindowLong function using the GWL_STYLE constant. The EM_SETREADONLY message applies to
both single-line and multiline edit controls.
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