how to display error message?

Giganews Newsgroups
Subject: how to display error message?
Posted by:  LunaMoon (lunamoonmo…
Date: Sun, 6 Jul 2008

Hi all,

I am using VC++ to develop some XLL file for use in Excel 2003.

Of course there are bugs.

The cell display "#NUM!".

But in VC++ I've already thrown exception with error message:

if (a!=b)
  throw Constructor ("a must be equal b.", "myclass")...

Why couldn't I see the error message in Excel?