Re: Writing a character to the beginning of the same file


Scott McPhillips [MVP] wrote:
> SAM wrote:
>
> > Hi,
> >
> > I have program that pre-appends a character to a file. it is not
> > working.
> >
> > Here is the problem.
> >
> > I am not able to write a character to the beginning of the file
without
> > affecting the previous content.
> >
> > Is there any limit on the size of the line in UNIX text files?
> >
> > I am doubtful if there is a line length limit for a text file. If
there
> > is line limit then I can easily copy the content of the first line
into
> > a temporary byte array and add the new character to be added to
another
> > temporary byte array and append the old byte array to this new
> > temporary byte array and write the contents of the new array into
the
> > same file at the beginning.
> >
> >
> > can u please help me.
> >
> > SAM
> >
>
> The issue has nothing to do with size of lines. There is no unused
> space in a text file. Adding a character anywhere within a file
makes
> the file longer. Every byte after the insertion point must be
rewritten
> to its new location in the file.
>
> --
> Scott McPhillips [VC++ MVP]


So what is the solution to write a character to the beginning of the
file and not affect the existing content.

.

Relevant Pages

  • Re: Need help with textboxes
    ... character into the input box. ... one of assigning the reference to a variable: ... All forms and their children are stored in an array ... No. Bracket property accessors allow their argument to be any string value. ...
    (comp.lang.javascript)
  • Help in Spanish translation of the description of UDFs
    ... functions of minimum / maximum values among elements of an array column. ... GETALLWORDS- Inserts the words from a string into a global dimensioned ... WORDTRAN- Searches a character string for occurrences of a first word, ... ARRAYSUM- Returns the sum of all or a specified range of numeric (and/or ...
    (microsoft.public.fox.helpwanted)
  • Re: Pointer
    ... require in input a pointer char: ... unsafe public static extern int OpenFile; ... What is it pointing to exactly, is it pointing to a "Unicode character" array or is it pointing to a "Single byte character" array or is it pointing to something else? ...
    (microsoft.public.dotnet.languages.csharp)
  • Re: problem with unhandled exception (acces violation) and undefined array/pointer
    ... If you pass a real array to a ... character dummy the extra arguments won't be there. ... occasional fortran user with limited knowledge, ... with compile and link options, ...
    (comp.lang.fortran)
  • Re: Pointer
    ... require in input a pointer char: ... unsafe public static extern int OpenFile; ... What is it pointing to exactly, is it pointing to a "Unicode character" array or is it ...
    (microsoft.public.dotnet.languages.csharp)