writing into a file

This is a discussion on writing into a file within the C Programming forums, part of the General Programming Boards category; I am facing a weird problem when i try to write the contents of a char array into a file. ...

  1. #1
    Eager young mind
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    writing into a file

    I am facing a weird problem when i try to write the contents of a char array into a file.

    I first do:
    Code:
          fp=fopen(filename,"w");
          fprintf( fp1 ,"%s" , buf);
          fclose(fp);
    here, buf points to the starting location of my char array...

    the contents of this array will be re-written during the execution , and so, to transfer the new content into a file I do :

    Code:
          fp=fopen(filename,"a");
          fprintf( fp1 ,"%s",buf);
          fclose(fp);
    again , here buf points to the start ...

    the problem is : after the execution , when i open the file with "cat" , the contents of the file is displayed correctly..

    when i open it thru a text editor, I see non-ascii characters at the end of each line
    Last edited by kris.c; 06-30-2006 at 02:26 AM.

  2. #2
    and the hat of wrongness Salem's Avatar
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    Well since your other threads involve reading from the network, my guess is your strings lack a \0 in the correct place, so you end up with random junk after each bit of valid text.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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