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Re: FSSetCatalogInfo not using full UTCDateTime

I am not sure why the fraction is set to zero, nor do I know if any other
formats support it... But if all you are doing is comparing the
mod/creation dates of files, you don't need the fractions field at all. The
other fields should provide enough granularity to get the job done. It will
be _extremely_ rare that the comparison between two files will go down to
the fraction... Good luck...

--Rob


On 2/27/02 5:20 AM, "Matt Gough" <email@hidden> wrote:

> On OS X, does the File Manager not respect the fraction field of any
> UTCDateTime records that are used when setting catalog info for one of its
> dates?
>
> After calling the following code (on a file on an HFS+ volume),
> catInfo.contentModDate.fraction is always set to zero, even though
> GetUTCDateTime sets it as appropriate.
>
> FSCatalogInfo catInfo;
>
> GetUTCDateTime(&catInfo.contentModDate, kUTCDefaultOptions);
>
> ::FSSetCatalogInfo(&myRef, kFSCatInfoContentMod, &catInfo);
> ::FSGetCatalogInfo(&myRef, kFSCatInfoContentMod, &catInfo, nil, nil, nil);
>
>
> Are there perhaps file systems for which the fraction is preserved?
>
>
> What I am really interested in is correctly identifying identical files on
> two different volumes for synchronization purposes. Comparing the dates
> could be problematic if one volume format has fractions and the other
> doesn't. (Obviously, I could just ignore the fraction in the compare, but I
> want a better understanding of what is really going on before embarking down
> the wrong road).
>
> Matt Gough
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References: 
 >FSSetCatalogInfo not using full UTCDateTime (From: Matt Gough <email@hidden>)



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