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Thread: Cannot append to QFile using QIODevice::Append

  1. #1
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    Default Cannot append to QFile using QIODevice::Append

    Hi,
    Using the code below, I cannot get my program to open a text file and append to the end (log file). Instead, it overwrites all the data as if I had just sent a normal ReadWrite parameter. Have I done something wrong?

    Qt Code:
    1. log = new QFile( filePath + "/variant.log"); // Create a new file called variant.log
    2. Q_CHECK_PTR( log );
    3. if( !log->isOpen() )
    4. if( !log->open(QIODevice::Append | QIODevice::Text)) // open it
    5. return 1;
    6. stream = new QTextStream( log ); // Create a stream so that we can write to the file
    7. Q_CHECK_PTR( stream );
    8. return 0;
    To copy to clipboard, switch view to plain text mode 
    Qt Code:
    1. if( log->isWritable() )
    2. *stream << QDateTime::currentDateTime().toString("dd.MM.yy hh:mm:ss.zzz") << ": " << theError << "\n";
    To copy to clipboard, switch view to plain text mode 
    Last edited by philwinder; 14th November 2008 at 16:26.
    Best Regards,
    Phil Winder
    www.philwinder.com

  2. #2
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    Default Re: Cannot append to QFile using QIODevice::Append

    Have you checked where your code fails?
    Can you open the file? Does the file exist afterwards (or before)? Do you have write permissions? Does it get modified (maybe at the wrong place)?

  3. #3
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    Default Re: Cannot append to QFile using QIODevice::Append

    Very sorry, I didn't mention that the code does work, but it overwrites, not append. Editing post now.
    Best Regards,
    Phil Winder
    www.philwinder.com

  4. #4
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    Default Re: Cannot append to QFile using QIODevice::Append

    Does someone think this is a Qt bug?
    Best Regards,
    Phil Winder
    www.philwinder.com

  5. #5
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    Default Re: Cannot append to QFile using QIODevice::Append

    What Qt version do you have? What if you try to compile it with another version of Qt or (just guessing) try to compile it on another platform.
    Probably this will help to find out whose bug it is.
    I'm a rebel in the S.D.G.

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