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    copied!<p>ba.constantData() is returning a pointer to data which will be invalid when QstrToChar finishes executing (the 8-bit converted QByteArray), when QstrToChar completes, all you have left is free'd junk.</p> <p>What if you just did:</p> <pre><code>file = new ID3(fileName.toLocal8Bit().constData()); </code></pre> <p>in your main routine?</p> <p>Actually, you still probably need to keep your own copy of this data in your private ID3 char *, since it can go away with the destruction of these temporaries.</p> <p>Your code should be this, instead:</p> <pre><code>class ID3{ std::string fileName; std::smart_ptr&lt;TagLib::FileRef&gt; file; public: ID3(std::string); QImage* artwork(); } ID3::ID3(std::string fileNameStr) { this-&gt;fileName = fileNameStr; this-&gt;file.reset(new TagLib::FileRef(fileNameStr)); qDebug()&lt;&lt;fileNameStr; //OUTPUT 2 } QImage* ID3::artwork(){ QString str = QString::fromLocal8Bit(this-&gt;fileName); qDebug()&lt;&lt;str; //OUTPUT 3 //MORE CODES------- } std::string QstrToCppString(QString str){ QByteArray ba = str.toLocal8Bit(); qDebug()&lt;&lt;ba.constData(); //OUTPUT 1 return std::string(ba.constData()); } int main(int argc, char *argv[]){ . . . QString fileName = "C:/Qt/Qt5.0.2/Projects/taglib_test/music files/Muse_-_Madness.mp3"; file = new ID3(QstrToCppString(fileName)); QImage *image = file-&gt;artwork(); } </code></pre> <p>Notice that I've wrapped your TagLib::FileRef in a smart_ptr as well, since you are new-ing it, you'll need to manage the memory. An alternative would be to write a proper destructor for your ID3 class. You're definitely leaking these currently (unless you just didn't share your destructor code).</p>
 

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