1. Truncating Files - Please help
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Euphoria WIN32
Using the file open for update function. When I write to file with less data
than the file held previously, the data not overwritten appears at the end of the
file. I need to 'truncate' the file at the end of the new data by adding a new
end of file marker. Can anyone tell me how I do this.
Thanks,
Matthew
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<DIV><FONT size=2>
<DIV><FONT size=2>Euphoria WIN32</FONT></DIV>
<DIV><FONT size=2>Using the file open for update function. When I write to file
with less data than the file held previously, the data not overwritten appears
at the end of the file. I need to 'truncate' the file at the end of the new data
by adding a new end of file marker. Can anyone tell me how I do
this.</FONT></DIV>
<DIV><FONT size=2>Thanks, </FONT></DIV>
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2. Re: Truncating Files - Please help
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If this is strictly a TEXT file then writting a Ctrl-Z (26) as the last
character may help. If that doesn't work, you will be forced to create a new file
by copying just the amount you want and then deleing the old and renamng the new
back to the original name.
For non-text files, if you have you're own internal format, you can devise a
scheme where you update a pointer to the logical end of file. If it is not you're
own format then you have to do the copy-delete-rename routine.
The disk file systems used is DOS, Windows and Unix do not support an
END-OF-FILE marker concept. With the exception that Ctrl-Z is supposed to mark
the end of a TEXT file in Microsoft (and CP/M) systems.
---------
Derek
----- Original Message -----
From: andy at anders98.freeserve.co.uk
To: EUforum
Sent: Thursday, February 07, 2002 7:02 AM
Subject: Truncating Files - Please help
Euphoria WIN32
Using the file open for update function. When I write to file with less data
than the file held previously, the data not overwritten appears at the end of the
file. I need to 'truncate' the file at the end of the new data by adding a new
end of file marker. Can anyone tell me how I do this.
Thanks,
Matthew
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<DIV><FONT face=Arial size=2>If this is strictly a TEXT file then writting a
Ctrl-Z (26) as the last character may help. If that doesn't work, you will be
forced to create a new file by copying just the amount you want and then deleing
the old and renamng the new back to the original name. </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>For non-text files, if you have you're own internal format,
you can devise a scheme where you update a pointer to the logical end of
file. If it is not you're own format then you have to do the copy-delete-rename
routine.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>The disk file systems used is DOS, Windows and Unix do not
support an END-OF-FILE marker concept. With the exception that Ctrl-Z is
supposed to mark the end of a TEXT file in Microsoft (and CP/M)
systems.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>---------</FONT></DIV>
<DIV><FONT size=2>Derek</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=andy at anders98.freeserve.co.uk
href="mailto:andy at anders98.freeserve.co.uk">andy at
anders98.freeserve.co.uk</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=EUforum at topica.com
href="mailto:EUforum at topica.com">EUforum</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, February 07, 2002 7:02
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Truncating Files - Please
help</DIV>
<DIV><BR></DIV><PRE>============ The Euphoria Mailing List ============
</PRE>
<DIV><FONT size=2>
<DIV><FONT size=2>Euphoria WIN32</FONT></DIV>
<DIV><FONT size=2>Using the file open for update function. When I write to
file with less data than the file held previously, the data not overwritten
appears at the end of the file. I need to 'truncate' the file at the end of
the new data by adding a new end of file marker. Can anyone tell me how I do
this.</FONT></DIV>
<DIV><FONT size=2>Thanks, </FONT></DIV>
<DIV><FONT
size=2>Matthew</FONT></DIV></FONT></DIV><PRE>==^================================================================
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