[Qt-interest] Is there any hope for the pos() method when used with a QTextStream?

[Atlant Schmidt]

Thiago:

  Thanks for confirming my suspicions; I'll switch
  to some other approach.


All:

  Suggestions on the alternative approach are still
  very-much welcome. At the moment, I see three
  alternatives (in no particular order):

    o Substitute POSIX calls for the Qt calls.

    o Keep an array of QStrings that represent
      the complete text on the pages I've passed
      by, "lazy loading" those strings as I move
      forward to newly-encountered pages in my
      file.

    o Using my own line count, move backwards by
      "rewinding" the file to the beginning and
      then reading forwards again to the newly-
      desired line.

                          Atlant

-----Original Message-----
From: qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com [mailto:qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com] On Behalf Of Thiago Macieira
Sent: Thursday, September 08, 2011 18:53
To: qt-interest at qt.nokia.com
Subject: Re: [Qt-interest] Is there any hope for the pos() method when used with a QTextStream?

On Thursday, 8 de September de 2011 17:00:04 Atlant Schmidt wrote:
>   So, is there any hope for me? I already keep a line count so when I need
>   to page backwards, I COULD close and re-open the file and then read
>   forward to the new position that I want, but that seems like using a punch
> card solution in the smartphone age*. Has QTextStream::pos()  been fixed?
> If not, can it be fixed? And if it isn't/can't, has anyone got any better
> ideas for alternatives? (I'd prefer not to keep several tens of thousands
> of lines of text in an array of QStrings in memory, although that would
> work too.)

Forget pos(). Keep the line number and column number instead.

The existence of pos() in QTextStream is a flaw in design. Trying to keep a
byte count in a buffered stream, after converting from an arbitrary 8-bit codec
into UTF-16, is close to impossible.

--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358

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