This looks similer to my problem with File Stream.
I am trying to modify a File with FileWrite at a perticuler file
position(middle of the file). After the write, the file gets truncated
and I am losing the rest of the file content.
The following is what I do...
static int WriteChars(CharPtr filename, CharPtr text, long seekPos)
{
FileHand theStream = NULL;
int numObjects=0;
theStream = FileOpen(0, filename, sysFileTFileStream, creatorId,
fileModeUpdate, &err);
FileSeek(theStream, seekPos, fileOriginBeginning);
numObjects = FileWrite(theStream, text, (long) sizeof(char),
(long)(StrLen(text)-1), &err);
FileFlush(theStream);
FileClose(theStream);
return numObjects;
}
I will highly appreciate your help.
Thank you,
Chida
Steve Mann wrote:
> >should I delete a record
> >and then add the new record fresh for an edit or should I use DmWrite or
> >another function that I have missed?
>
> In my experience, it kind of depends on the situation. There's no one
>
> right answer.
>
> If you have to do a _lot_ of DmWrites, for instance, to update
> several different discrete byte ranges, then maybe deleting and
> creating a new record makes sense. It's simpler, easier, and more
> straightforward code. If you are buffering all the new data in a
> struct and can just blast it into the existing record, and it'a all
> the same size, DmWrite works fine.
>
> There are no other wildly relevant functions, except there is one Fld
> function that lets you update a record in place, from a field's text,
> as long as you are only doing that with one field. The technique is
> described in the Rhodes/McKeehan book.
>
> Regards,
> Steve Mann
>
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