Thread: Deleting text from a file???

  1. #1
    Registered User 00Sven's Avatar
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    Deleting text from a file???

    I am making a program that keeps track of files. It does this by writing the name of the file into "filelist.txt" and then when I need to read the list I just scan the file and print out the names. My problem is that when I delete a file I also need to delete that listing in filelist.txt and I do not know how to do this. Any help would be appreciated. Thank you in advance.
    ~Sven
    Windows XP Home Edition - Dev-C++ 4.9.9.2
    Quote Originally Posted by "The C Programming Language" by Brian W. Kernignhan and Dennis M. Ritchie
    int fflush(FILE *stream)
    On an output stream, fflush causes any buffered but unwritten data to be written; On an input stream, the effect is undefined. It returns EOF for a write error, and zero otherwise. fflush(NULL) flushes all output streams.
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  2. #2
    ATH0 quzah's Avatar
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    Read the whole thing, write it back out without whatever it is you don't want in it.


    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
    Registered User 00Sven's Avatar
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    How can I tell how many lines there are to read? I need to know how many lines I will be reading in so that I can make the array that they are stored in the right size.
    ~Sven
    Windows XP Home Edition - Dev-C++ 4.9.9.2
    Quote Originally Posted by "The C Programming Language" by Brian W. Kernignhan and Dennis M. Ritchie
    int fflush(FILE *stream)
    On an output stream, fflush causes any buffered but unwritten data to be written; On an input stream, the effect is undefined. It returns EOF for a write error, and zero otherwise. fflush(NULL) flushes all output streams.
    board.theprogrammingsite.com

  4. #4
    and the hat of int overfl Salem's Avatar
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    > How can I tell how many lines there are to read?
    You only need to store 1 line

    - read a line in
    - do I want to keep it, if so write it to another file
    - repeat until end of file
    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.

  5. #5
    Been here, done that.
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    Quote Originally Posted by Salem
    > How can I tell how many lines there are to read?
    You only need to store 1 line

    - read a line in
    - do I want to keep it, if so write it to another file
    - repeat until end of file
    Then
    - delete the original file
    - rename the new file to the original name.
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