I have the following as the first line of all my C++ .nw files:
-*- noweb-code-mode: c-mode; -*-

This tells noweb which major mode to switch when the code mode is entered.
Just change it as appropriate for whatever language you are using i.e. I
use

-*- noweb-code-mode: python-mode; -*-

when coding Python noweb files.

Peter

On Sun, Aug 16, 2009 at 3:47 AM, wewwew <wew036@cs.usask.ca> wrote:

> Hi,
> I am using noweb mode in Emacs to write noweb programs (LaTeX + C++).
> It recognizes LaTeX fine.  However, in most cases it cannot recognize
> C
> ++ mode correctly.  Is there a command to force noweb to drop into
> the
> code-mode?  That way I can define a hot key to manually convert to
> code-mode when it is not correct.
> Thanks!
> -Wenguang
>