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List:       taglib-devel
Subject:    Re: Creating FileRef object from QString
From:       Michael Pyne <mpyne () purinchu ! net>
Date:       2009-12-05 19:48:05
Message-ID: 200912051448.05539.mpyne () purinchu ! net
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On Saturday 05 December 2009 13:59:35 Plasty Grove wrote:
> Hi,
> 
> I'm developing using qt and have a situation where I have to create a
> FileRef object from a QString object.
> 
> --------------------------------------------------
> TagLib::FileRef tagFile("/home/mydir/music/song.mp3") //---> Works fine
> --------------------------------------------------
> QString qstr = "/home/mydir/music/song.mp3";
> const char* str = qstr.toLocal8Bit().constData();
> TagLib::FileRef tagFile(str); //---> Doesn't work, shows as empty in
> debugger and segfaults when I try to access
> --------------------------------------------------
> 
> What am I doing wrong here?

QString::toLocal8Bit returns a QByteArray, not a const char *.
That QByteArray is destructed once .constData() returns (since there's no 
reason for C++ to keep it around).

So now your const char * pointer is dangling in the middle of freed memory, 
and you get a crash.

Regards,
 - Michael Pyne

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