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Re: append to the first line of a text file.... [message #74435 is a reply to message #74433]

Fri, 14 January 2011 11:01

George Millward
Messages: 29
Registered: February 2000

Junior Member

On Jan 14, 10:34 am, David Fanning <n...@dfanning.com> wrote:
> George Millward writes:
>> I am wanting to 'append' an ascii file - but instead of appending the
>> new data to the bottom
>> I want the new data to be at the top of the file.
>
>> Does anyone have any suggestions ?
>
> Have you tried positioning the file pointer to the
> beginning of the file with POINT_LUN? Worth a try,
> I guess. You may have to include your own carriage
> return.
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.idlcoyote.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

David,

Yes, tried that - it just overwrites the first line - same as doing
openu and printf without /append

ie,

openu, /append
point_lun, 0
printf

is the same as:

openu
printf

At least I think so.

I guess I'm just going to have to write a routine to do what I want
...something like reading all the current data into a buffer - write
the new data - then append the buffer onto the new data.
...shouldn't be too hard - I was just wondering if there was a
keyword.

Thanks anyway.

George.

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[Message index]

		Re: append to the first line of a text file.... By: ben.bighair on Sat, 15 January 2011 05:46
		Re: append to the first line of a text file.... By: lecacheux.alain on Sat, 15 January 2011 00:48
		Re: append to the first line of a text file.... By: George Millward on Fri, 14 January 2011 11:01
		Re: append to the first line of a text file.... By: David Fanning on Fri, 14 January 2011 09:34

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