Rich Edit Version 2.0

[This is preliminary documentation and subject to change.]

Rich edit version 2.0 includes several new features, such as support for Unicode and Far Eastern languages, multilevel Undo, and numerous user interface enhancements.

With a few exceptions, rich edit 2.0 uses the same Win32 functions, structures, and messages as rich edit 1.0. The differences are listed following.

The name of the rich edit 1.0 window class is "RichEdit". Rich edit 2.0 has both ANSI and Unicode window classes, "RichEdit20A" and "RichEdit20W", respectively To specify the appropriate rich edit window class, use the RICHEDIT_CLASS constant, which the RICHEDIT.H file defines depending on the definition of the UNICODE compile flag.
In rich edit version 2.0, if you create a Unicode rich edit control, specify only Unicode data in any window messages sent to the control. Similarly, if you create an ANSI rich edit control, send only ANSI or DBCS data. You can use the IsWindowUnicode function to determine whether a rich edit control is Unicode.
Rich edit 1.0 used CRLF (carriage return, line-feed) character combinations for paragraph markers. RichEdit 2.0 uses only a carriage return character ('\r').
Rich edit 2.0 introduces the following new messages:

Message	Description
EM_AUTOURLDETECT	Enable or disable automatic URL detection.
EM_CANREDO	Determine whether there are any actions in the redo queue.
EM_GETIMECOMPMODE	Retrieve the current input method editor (IME) mode.
EM_GETLANGOPTIONS	Retrieve options for IME and Far East language support.
EM_GETREDONAME	Retrieve the type name of the next action in the redo queue.
EM_GETTEXTMODE	Retrieve the text mode or undo level.
EM_GETUNDONAME	Retrieve the type name of the next action in the undo queue.
EM_REDO	Redo the next action in the redo queue.
EM_SETLANGOPTIONS	Set options for IME and Far East language support.
EM_SETTEXTMODE	Set the text mode or undo level.
EM_SETUNDOLIMIT	Set the maximum number of actions in the undo queue.
EM_STOPGROUPTYPING	Stop grouping consecutive typing actions into the current undo action.

Rich edit 2.0 introduces the following new structures:

Message	Description
CHARFORMAT2	Contains information about character formatting.
PARAFORMAT2	Contains information about paragraph formatting.

Rich edit 2.0 does not support the following messages that were supported in Asian-language versions of rich edit 1.0:


EM_CONVPOSITION
EM_GETIMECOLOR
EM_GETIMEOPTIONS
EM_GETPUNCTUATION
EM_GETWORDWRAPMODE
EM_SETIMECOLOR
EM_SETIMEOPTIONS
EM_SETPUNCTUATION
EM_SETWORDWRAPMODE