Is it possible to set a user-defined value for notification rather than checking for default EN_MAXTEXT when control has been completely filled?
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Unfortunately, no. User-defined notifications do not exist.
Your (painful) alternative is to use the EN_CHANGE notification to notify you that a user has somehow changed the text and do a manual check to determine if it is full. (For example, you could check the line length with the EM_LINELENGTH message.) To receive the EN_CHANGE notification, be sure to specify ENM_CHANGE in the mask sent with the EM_SETEVENTMASK message. (See MSDN.)
Your best bet is to make EN_MAXTEXT work for you.
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