EN_MAXTEXT
Version 3.0
This code specifies that the current insertion has exceeded the specified number of characters for the edit control. The insertion has been truncated. This message is also sent when an edit control does not have the ES_AUTOHSCROLL style and the number of characters to be inserted would exceed the width of the edit control. The control's parent window receives this code through a WM_COMMAND message from the control.
wParam
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Contains the wParam parameter of the WM_COMMAND message, and specifies the control ID.
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lParam
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Contains an edit-control window handle in its low-order word and the EN_MAXTEXT code in its high-order word.
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