Problem with Access-mdb/DAO

[Fabian Cenedese]

>>I have posted this problem already long time ago but I never found the
>>time to test it again.
>>
>>http://www.winehq.org/hypermail/wine-devel/2002/11/1530.html
>>
>>But now I tried with the actual wine from cvs (2003-12-03) and it's still
>>there. The problem is that if I try to create a table in a Access database
>>the last char of the name gets lost. I now have a small program which
>>shows this error, maybe someone can use it for finding this bug.
>>It's a simple VC6 Wizard generated Win32 command line app which
>>uses MFC for DAO.
>>
>>The first time I tried was with SUSE 8.0, now I have Knoppix 3.3 (Debian).
>
>I also found that it can happen not only on column names but also on
>table field names. But most work ok. So it can't be that a general error
>as a wrong string function (I guess a lot more programs would have
>problems if it were this basic). Another guess is Variants. There are
>quite some calls to Variant functions but I couldn't find a culprit.

I think I found an error in SysStringLen. Why? Because my application
started to work a lot better. Why not? I don't know if this is the right fix
or other stuff is involved (as with the GetWindowLong).

     * The length of the string (in bytes) is contained in a DWORD placed
     * just before the BSTR pointer
     */
    bufferPointer = (DWORD*)str;
    bufferPointer--;
    return (int)(*bufferPointer/sizeof(WCHAR));

If I come here with a string like "Nodes" (normal string length 5) it will
return (int)(5/2)=2. But 2 is definitely not enough (in WCHAR length). But
if I do (int)((5+1)/2)=3 my name comes through. And also the other names
that got truncated. So I would change it to:

    return (int)((*bufferPointer+1)/sizeof(WCHAR));

Can anybody comment on this? Is this the right fix?

bye  Fabi