nsDependentString question...

[Antoine Julien]

According to the Guide to the Mozilla string classes 
(http://mozilla.org/projects/xpcom/string-guide.html#Appendix_WhatToUse), 
the nsDependentString should be used when you have a const char* or 
const PRUnichar* buffer that you need to pass to a function that 
requires a nsAC?String. (am I wrong to think that?)

My situation is the following: I have a const char* string that I need 
to pass to a method that requires a nsAString& (that method is 
nsIDOMCharacterData::InsertData(PRUInt32 offset, const nsAString& arg)). 
 However, when I try, it refuses to compile.  Here's the snippet :

/************* BEGIN SNIPPET *********************************/
nsIDOMText* aTextNode ; // already initialized
PRUInt32 anOffset = 1 ;
const char* mbString = "Test string" ; /* the const char* is actually a 
parameter of the current method */

PRUnichar* wcString = (PRUnichar*)nsMemory::Alloc(strlen(mbString)+1);

mbstowcs(wcString,mbString,strlen(mbString)) ; /* converts the char* to 
PRUnichar* */

aTextNode->InsertData(anOffset,nsDependentString(wcString)) ;

/************** END SNIPPET ********************************/

When I try this, I get the following error :

error C2440: 'type cast' : cannot convert from 'PRUnichar *' to 
'nsDependentString'

What am I doing wrong?  I've seen several places in the Mozilla code 
where the same operation is being done (one of the oh so many can be 
found at 
http://lxr.mozilla.org/seamonkey/source/editor/composer/src/nsEditorSpellCheck.cpp#253), 
I just don't see why their code works and not mine.

Thanks a lot.

A.
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