Re: Saving CArchive from VC8 -> reading on VC6

David Wilkinson <>
Tue, 07 Nov 2006 15:40:06 -0500
David Lowndes wrote:

I have forced a cast to CStringA on every CString serialization (just
on the save option) like follows:

ar << (CStringA)GetLibName();

I didn't intend for you to do that - does it actually work OK?

If your application isn't using Unicode strings, I think you'd be
safer changing the variables/methods to explicitly make them CStringA
types rather than judiciously casting things. As it is, what happens
if you have a string with a Unicode character that can't be converted
to the current code page? If you're not saving Unicode strings, what's
the point in having a Unicode application?

1) CTime. I have to force the cast to a 32-bit time as follows:

FWIW, there's a #define (_USE_32BIT_TIME_T) so that you can still use
the old 32-bit time format.



I serialize in XML, not binary, but the issue is the same. What I do is
save in UTF-8, which preserves the Unicode. If the OP's app only uses
ASCII characters then the VC6 and VC8 versions will still be compatible.
Whne the VC6 version becomes obsolete, the app will be fully Unicode-ready.

There was a post a while back about serializing CTime. I'm not positive,
but my recollection is that the _USE_32BIT_TIME_T thing did not work for
some reason.

David Wilkinson

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