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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