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bedit Control Messages
The bedit control sends a WM_CTLINIT message to its parent windows when
created. The wParam parameter holds the constant CTLINIT_BEDIT and lParam points to a CTLINITBEDIT structure. The structure contains the current system assumptions concerning
the appearance and behavior of the bedit control. The parent window has the
option of changing any of these assumptions.
An application can also initialize a bedit control for a dialog box by using a DIALOGEX resource in the dialog resource file (.RC) and specifying a CONTROL statement with a class of BEDIT or specifying a BEDIT edit control class. In
this case, the control still sends the WM_CTLINIT message. However, the CTLINITBEDIT structure reflects the specifications of the BEDIT class statement instead of
the system defaults. As before, the parent window can modify the structure if
desired. Refer to Chapters 11 and 12 for descriptions of the CTLINITBEDIT structure and WM_CTLINIT message, respectively. Refer to the DIALOGEX resource description in the Win32 SDK tools for more information on using the
BEDIT control class.
The EM_LIMITTEXT message deserves special mention because it has changed
slightly from version 1.0 of the Pen API. The message now sets the maximum number of
bytes of text, rather than the number of boxes, that the control can hold.
Note that although a newline character occupies only one box, the newline itself  carriage return and linefeed takes 2 bytes. Certain Far Eastern languages also require 2 bytes per
character.
Thus, the EM_LIMITTEXT message has the same effect on bedit controls as it
does on hedit and edit controls. For example, the instruction
SendMessage( hwndBedit, EM_LIMITTEXT, 50, 0L );
sets to 50 the number of bytes the bedit control can accept. This has the
following effects on the control:
- If the user attempts to write the 51st byte, the control beeps and ignores the
input.
- If the user inserts text into existing text, the control beeps and ignores
further input after the total number of bytes equals 50.
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