Re: Reentrancy issue

David Connet <>
Wed, 23 Jan 2008 17:17:02 GMT
[I missed the start of this thread, just commenting on what's below]
Actually, it looks like he's returning a reference to a member variable -
that's ok. The Format call is _definitely_ wrong. A "%s" in Format()
CANNOT take a CString. You must use the operator LPCTSTR() method on
CString (cast CString to an LPCTSTR)

However, that said, since the OP is re-using the same variable for each
call, it's unlikely he'll get what he wants. It's going to depend on
order of evaluation.

Dave Connet

Joseph M. Newcomer <> wrote in

It is not a reentrancy issue, it is a fundamental coding error. You
can't return a CString& to a local CString; it doesn't make sense!
You are returning a pointer to a location on the stack which no longer

I have no idea what you mean by "the formatting string is not good"
because "not good" is not a defined concept. In reading the code it
is clear what your bug is, but you need to be explicit about what is

On Tue, 22 Jan 2008 14:38:08 +0100, mosfet <>


I am using a small singleton class called ResManager to handle my
resources in MFC .

One of its method is defined as shown below :

CString& ResManager::GetResText(int a_ResId)
    BOOL bRet = m_strResText.LoadString( m_hResInst , a_ResId );
    if (bRet == FALSE) {
         WRITE2LN_LOG( "UIManager::GetResText : Cannot Load TEXT res
         with id ",
    return m_strResText;

The problem is when I call it like this :

CString strTmp;
strTmp.Format(_T("%s<BR><BR><a href=\"%s\">%s</a>"),

the formatted string is not good.

How can I solve this ?

Joseph M. Newcomer [MVP]
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