fstream.

This is a discussion on fstream. within the C++ Programming forums, part of the General Programming Boards category; Hmm, im right now working with a server/client application. May i know which ios::... to use to actually make it ...

  1. #1
    deletedforumuser
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    fstream.

    Hmm, im right now working with a server/client application.

    May i know which ios::... to use to actually make it save into the file and keep the old text in it too...

    Normally, when you write new text, it directly deletes the text that were in the files.

    Thank you.

  2. #2
    Banned master5001's Avatar
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    ios::append.....

  3. #3
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    >>Normally, when you write new text, it directly deletes the text that were in the files.
    actually unless you specify "std::ios::trunc" then it deletes the file, and makes a new one.

  4. #4
    Registered User Tonto's Avatar
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    I think this table is most helpful in telling the file modes exactly. It conpares c++ open modes with c open modes

    Code:
    Table 33: Open modes and their C stdio counterparts 
    Open Mode 	C stdio Equivalent 	Effect
    
    in - "r" Open text file for reading only 
    out|trunc or out - "w" Truncate to 0 length, if existent, or create text file for writing only
    out|app - "a" Append; open or create text file only for writing at end of file
    in|out - "r+" Open text file for update (reading and writing)
    in|out|trunc - "w+" Truncate to 0 length, if existent, or create text file for update
    in|out|app - "a+" - Append; open or create text file for update, writing at end of file
    http://stdcxx.apache.org/doc/stdlibug/30-3.html

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