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Re: Write to a certain line of a file [message #78959 is a reply to message #78958]

Thu, 19 January 2012 04:18

Brian Daniel
Messages: 80
Registered: July 2009

Member

I haven't done this, but POINT_LUN may do what you want. You'd need
to know the number of bytes per line. You will still have to read the
entire line, change the bit you want to change, move the LUN back to
the beginning of the line, and rewrite it.

OpenR, LUN, filename, /Get_Lun
Point_Lun, LUN, line_number * bytes_per_line
tmp=''
ReadF, LUN, tmp
; change the line as you see fit
new_line = tmp + 'changed line!'
Point_Lun, LUN, line_number * bytes_per_line
PrintF, LUN, new_line
Free_Lun, LUN

Code is UNTESTED!

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[Message index]

		Re: Write to a certain line of a file By: David Fanning on Thu, 19 January 2012 11:02
		Re: Write to a certain line of a file By: Michael Galloy on Thu, 19 January 2012 09:49
		Re: Write to a certain line of a file By: Mark Piper on Thu, 19 January 2012 08:43
		Re: Write to a certain line of a file By: Brian Daniel on Thu, 19 January 2012 04:18
		Re: Write to a certain line of a file By: Brian Wolven on Wed, 18 January 2012 18:02
		Re: Write to a certain line of a file By: Matt Francis on Wed, 18 January 2012 17:16
		Re: Write to a certain line of a file By: Michael Galloy on Wed, 18 January 2012 12:08
		Re: Write to a certain line of a file By: natha on Wed, 18 January 2012 12:05
		Re: Write to a certain line of a file By: Mark Piper on Fri, 20 January 2012 08:21

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