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Re: I need help, about c++ pointer

From: Guillaume Lelarge <guillaume(at)lelarge(dot)info>
To: pgadmin-support(at)postgresql(dot)org
Cc: Quan Zongliang <quanzongliang(at)gmail(dot)com>
Subject: Re: I need help, about c++ pointer
Date: 2009-07-15 14:38:13
Message-ID: 200907151638.13780.guillaume@lelarge.info (view raw or flat)
Thread:
Lists: pgadmin-support
Hi,

Le mercredi 15 juillet 2009 à 14:04:27, Quan Zongliang a écrit :
> [...]
> I ceate some pointers with:
>
>     SQLWCHAR** stmtlabels = m_srcodbc->GetResultColLabels();
>     m_curstmtlabels = new SQLWCHAR*[m_curstmtcolsnum];
>     for (colidx=0; colidx<m_curstmtcolsnum; colidx++)
>         if (stmtlabels[colidx])
>         {
>             m_curstmtlabels[colidx] = new
> SQLWCHAR[wcslen(stmtlabels[colidx])+1]; wcscpy(m_curstmtlabels[colidx],
> stmtlabels[colidx]);
>         }
>         else
>             m_curstmtlabels[colidx] = NULL;
>
> delete them with:
>
>     if (m_curstmtlabels)
>     {
>         SQLSMALLINT colidx;
>         for (colidx=0; colidx<m_curstmtcolsnum; colidx++)
>             if (m_curstmtlabels[colidx])
>                 delete[] m_curstmtlabels;
>     }
>
> When delete pointers, the first loop is ok.
> But the sencond loop get a crash.
> It seems the first loop delete second array too.
> How to correct it?
>

Shouldn't you do this?

if (m_curstmtlabels)
{
  SQLSMALLINT colidx;
  for (colidx=0; colidx<m_curstmtcolsnum; colidx++)
    if (m_curstmtlabels[colidx])
      delete m_curstmtlabels[colidx];
}

BTW, it would have been better on pgadmin-hackers :)

> BTW:
> wcscpy, wcscmp, wcslen ... functions can be supported by all platforms?
>

I suppose so, but I'm not really sure.


-- 
Guillaume.
 http://www.postgresqlfr.org
 http://dalibo.com

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