Adding to a file

This is a discussion on Adding to a file within the C++ Programming forums, part of the General Programming Boards category; I have a tab delimited text file which is filled with data from an rc file. I want to add ...

  1. #1
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    Arrow Adding to a file

    I have a tab delimited text file which is filled with data from an rc file. I want to add another column to each line of the file after the first two '\n's.
    This is the code I have at the moment:

    Code:
    fstream Glossary;
    Glossary.open("file.txt");
    Glossary.seekg(pos);
    while(!Glossary.getline(val, 100).eof()) {
    Glossary.ignore(100, '\t');
    Glossary.ignore(100, '\t');
    Glossary<<Offset+1<<'\t';
    }
    Glossary.close();
    This code isn't actually adding anything to the file though. When i debug it it seems to find the right place to add the new text but it doesn't actually do it... Any ideas? If there's another, better way to do this please let me know. Thanks

  2. #2
    and the hat of wrongness Salem's Avatar
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    There is no file insert functionality.

    You read in the old file, and write out the new file with whatever changes you need to apply, on a line by line basis.

    Then you delete the old file and rename the new file.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
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    Ah ok. Thanks

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